- Open Access
Perception of the risk of tsunami in a context of high-level risk assessment and management: the case of the fjord Lyngen in Norway
© The Author(s). 2017
- Received: 25 May 2016
- Accepted: 19 January 2017
- Published: 13 February 2017
North Norway, the banks of the fjord Lyngen are highly exposed to a rockslide tsunami hazard. However, the local municipality believes that the coastal community is well-informed about the risk and ready to evacuate, should a warning be issued. Accordingly, the social survey we conducted in this municipality was a matter of exploring three main questions: is the Lyngen population well-informed about the tsunami risk in general and about the potential evacuation time in particular? Is the local population as confident as the local municipality hope? Is there enough information on the tsunami risk for tourists, given their growing number?.
The survey shows that the local population has a clear perception of the tsunami hazard, but that warning and evacuation conditions are not sufficiently well-known, despite the local and national communication work. Moreover confidence in the municipal authorities seems to be imperfect, although confidence concerning hazard surveillance is higher than confidence in the information provided on risk and management. As often, tourists are less informed on natural hazards or evacuation conditions.
The municipal authorities have to improve the information locally delivered. Authorities must also disseminate information to the tourists, especially on a possible evacuation during their stay, so as not to raise anxiety or trigger a decline in the area's touristic appeal.
The devastating tsunamis in Indonesia and Japan in 2004 and 2011 illustrate the vulnerability to this natural hazard of coastal communities and tourist regions, where for various reasons, sea level rises very rapidly to abnormally high levels, resulting in the submersion of low-lying coastal areas. As the European tsunami catalogue highlights, the European coast is also prone to tsunamis: for instance, the Mediterranean has been exposed to about one tenth of the tsunamis reported worldwide since 1840 (Tinti et al. 2001) and the tsunami that hit Lisbon, in southwestern Europe in 1755 is widely known (Baptista and Miranda 2009; Mendes-Victor et al. 2009). In another example from northern Europe, historical evidence shows that Norway has witnessed two to three catastrophic tsunamis per century, resulting in a total of 250 fatalities over the last four hundred years (Harbitz et al. 2014). Yet in general there is no real tsunami risk culture in Europe, because of their relative infrequency in this part of the world and their smaller scale (Dawson et al. 2004). As such, the European research project ASTARTE (Assessment, STrategy And Risk Reduction for Tsunamis in Europe) endeavours to improve knowledge and management of this risk on a broad European scale1. This cross-cutting and multi-disciplinary project deals with every aspect of risk and brings together researchers in geosciences and humanities. The humanities researchers in particular conducted a comprehensive survey of the perception of tsunami risk in Europe, among 1,373 respondents. The results of the Norwegian case study are detailed here, as it contains a number of interesting specificities.
To respond to the questions raised by the ASTARTE programme, we conducted a survey among inhabitants and tourists on this test-site. However, unlike the objectives of the survey on the other ASTARTE programme sites, our aim in this case was not to measure whether the tsunami risk was locally known or not, but to start from the hypothesis – based on a discussion with the local authorities – that the population was already well aware of this risk. In fact, the municipal authorities, which are co-responsible for the warning system, consider that the population is ready to evacuate should a warning be issued: in their opinion, the people are well informed about the hazard and evacuation procedures, given the posters on the town hall, reports in the press and a recently conducted evacuation drill. The municipal authorities are therefore more concerned about whether the population would be willing to evacuate and whether the feelings that currently prevail are based on trust in the local authorities and their risk management capabilities or, on the contrary, fuelled by fear and uncertainty surrounding the risk (personal comments by the local authorities). The social survey we conducted at the Norwegian site was thus a matter of measuring not only knowledge of the potential tsunami risk and the crisis management system, but also confidence in the risk management procedures and risk managers (e.g. the municipal authorities). The survey was also designed to measure awareness and responsiveness among tourists as in the other ASTARTE sites. In fact, researchers and risk managers are taking a growing interest in the risk perception of tourists and tourism suppliers (Rittichainuwat 2013), looking at the link between perceived risks and the choice of a tourist destination (Seabra et al. 2013). Around the fjord Lyngen, the population increases threefold in summer due to the influx of tourists.
Having presented the context and method applied for the survey, this paper will explore the main results of the survey and discuss three main questions: is the Lyngen population well-informed about the tsunami risk in general and about the potential evacuation time in particular? Is the local population as confident as the local municipality hope? Is there enough information on the tsunami risk for tourists, given their growing number?
Physical and social context of the survey
A tsunami in the fjord Lyngen could be the result of two factors: an underwater landslide, or the collapse or rockslide from a flank of Nordnes mountain which sits on the shore of the fjord (Figs. 1 and 2). A large rocky mass sliding into the fjord would be enough to trigger a tsunami, known locally as "flodbølge", and would have a major effect on the village of Lyngseidet, located 7 km away on the opposite bank (Figs. 1 and 2). On Nordnes mountain, there is a deformed area measuring 4 km long and 1.2 km wide, with an average slope gradient of 30° above a 300-400 m high, west-facing cliff (Braathen et al. 2004). With displacement occurring at a rate of 4 to 5 cm per year, a mass of 22 million m3 could potentially slide into the fjord (NGI, 2010). Current modelling work by the Norwegian Geotechnical Institute (NGI) estimates the collapse as closer to 11 million m3, with the resultant wave reaching up to 33 m high in Lyngseidet (NGI, 2013). The alert level has been heightened since October 2012 because displacement of the mountain mass gathered speed after significant rainfall (DSB 2013).
Concerning the Nordnes mountain, NGI has established a very detailed modelling of the rockslide and subsequent tsunami inundation of the fjord banks (NGI, 2008; NGI, 2010; NGI, 2013). Two scenarios, based on the collapse of 7 to 11 million m3, have been established, using models built on various scales and then nested. They give wave heights ranging from 6 to 33 m at Lyngseidet on the fjord's western bank; these waves would arrive on the shores 2 to 3 minutes respectively after the rocky mass hits the sea. However, the effects of this wave would be locally contained and have little impact outside the fjord Lyngen like other rockslide tsunamis in the country (Ramberg et al. 2008). At the time of the survey, the mountain was being monitored by the NNFO (Northern Norwegian Mountain Surveillance), which used 70 instruments to take 300,000 measurements a day. Nowadays, it is monitored by NVE (Norges Vassdrags- og Energidirektorat). Surveillance levels are just as high as in other Norwegian fjords concerned by rockslides: today’s technology makes it possible to detect movements of no more than a few millimetres with great precision (Ramberg et al. 2008). On Nordnes mountain, this permanent, high-precision surveillance enables the site to be placed on a "red level" whenever the rate of displacement exceeds 15 mm per day. The time interval between this acceleration and the real rockslide is thus relatively long, measured in "days" and not in hours or minutes. The warning system is managed by the municipality in cooperation with NVE. Based on this threat, a crisis management drill was performed under the umbrella of the Norwegian Directorate for Civil Protection in 2013, as part of the joint rescue exercises implemented since 2008 by a number of countries lying on the Barents Sea (http://www.dsb.no). The drill simulated a red alert and included the evacuation of a number of elderly and sick residents (DSB 2013). It is important to highlight that there are, north of the Arctic circle, specific problems related to tsunami impact and evacuation in the winter time, such as low temperatures, cold water, slippery roads, darkness almost 24/7, and snow storms. In this context, evacuation drills are of particular importance. Since this 2013 drill, the town council has been locally promoting the fact that the population and the municipal services will be moved several weeks before a rockslide, as soon as the likelihood of its release is considered certain. The population will receive a final alert at least 72 hours before the rockslide and subsequent tsunami. This timing is related to the Norwegian Planning and Building Act, requiring that such an event should be forecast at least 72 hours in advance, otherwise, the region must be abandoned or not developed further (Harbitz et al. 2014). People will therefore not be forced to leave the site rapidly – i.e. in a matter of minutes – because they will be alerted several days before the rockslide and subsequent tsunami. Generally speaking, the population is alerted using standard methods in case of natural risks, e.g. through websites or national media, when storms, avalanches or road closures are announced. However, in certain fjords, and in particular in Lyngen, the population will also be alerted by SMS in the case of a rockslide tsunami (personal comments by the municipal authorities). In such a scenario, human casualties should be avoided, although material destruction is inevitable, on condition that the population closely follows the planned evacuation procedures. The issues of warning and evacuation differ completely in this case from what those, for example, on a densely occupied Mediterranean beach exposed to an earthquake-related tsunami.
Despite the low population density (under 4 inhabitants/km2), Lyngen's population is relatively exposed to the tsunami risk because of the number of dwellings on the coast. In 1801, Lyngen Municipality comprised 965 inhabitants. There were 2,687 in 1910 and 2,861 in 2016 (www.ssb.no/en/). The municipality includes twenty scattered villages and settlements such as Lyngseidet and Furuflaten on the western side of the fjord Lyngen, or Olderdalen on its eastern side (Fig. 1). In these Norwegian maritime regions, the risk of tsunami is relatively higher today than in the past, given the increase in human exposure brought about by the greater numbers of inhabitants on the coast and of tourists visiting the fjords. The municipality numbers 1,300 dwellings, 90% of which were built after 1945 and a quarter of which are holiday homes (www.ssb.no/en/). The villages are connected to one another and to the emergency services by ferry or via the only coastal road, which itself is subject to tsunami and other hazards such as avalanches. Among the most vulnerable population groups, the over-80s account for almost 7% of the population and the under-15s for almost 16% (01.01.2016, www.ssb.no/en/). Aside from agriculture, which occupies 20% of the land along the fjord in 2015 (www.ssb.no/en/), other economic activities include fishing and fish processing, tourism and light industry, mainly in Furuflaten (personal comments by the local municipality).
Methods used for the ASTARTE survey
A comprehensive survey was conducted among the 1,373 people on the ten sites of the ASTARTE programme, including the test-site at Lyngen. The humanities and social science researchers designed and standardised the questionnaire, which was conducted in several countries, in such a way that as many points of inter-site comparison as possible could be listed, despite the significant socio-economic and cultural differences. "Comparing the incomparable" is no longer taboo, in the view of Belgian historian M. Detienne (2008), who positively advocates comparing societies at different times and in different places, allowing what was previously unnoticed, unusual, or hidden to emerge and give rise to new theories. This method of comparison can be applied to all sort of distant, theoretically incomparable objects, such as countries, sites, contexts, themes, populations and policies, as exemplified by J. Diamond’s comparison of societies which had experienced some sort of “collapse” (Diamond 2005). Several humanities and social science disciplines, including geography, have adopted Detienne’s prescription for themselves, bringing greater depth and openness to their methods of comparison, whose objectives embrace two well-known goals: “informing generality” and “explaining uniqueness” (Bradshaw and Wallace 1991). RW Schrauf (2016) explains how quantitative cross-cultural research can be used for similar between-group comparisons, for questions of society or behaviour. In 1978, Burton et al. already evoked such a method by proposing a wide cross-cultural comparison of responses and choices to 8 natural hazards, concerning 40 places in 17 different countries, 120 people being generally interviewed in each place. Because of "severe methodological and communication obstacles", "it was necessary [for the searchers] to ask what few findings seem to be generally applicable, and what combinations of local conditions account for differences in findings from place to place" (Burton et al. 1978). This explains the decision of the social science researchers of the ASTARTE programme to undertake a vast survey in nine different (mostly European) countries, and not only to analyse each site independently – as in the example given here – but to compare the various sites with each other, (Goeldner-Gianella et al. 2015), thus transcending national socio-cultural differences.
But the research undertaken in the ASTARTE programme is also applied research, aimed primarily at local actors involved in tsunami risk management. The results of the survey of perceptions of this risk must for example help them measure the degree of risk-awareness among populations, improve the information where necessary and identify which groups are better or less well informed. As a result, following the survey, the programme also produced information leaflets on the local tsunami risk to be used by local actors. The ASTARTE survey was thus not created in order to prove or disprove conceptual research hypotheses, as other researchers in rockslide tsunami risk have done in Norway (Rød et al. 2011; Rød et al. 2012); it was created with researchers in each country in response to the demands and questions of every test-site. The objectives of this study in the case of the Norwegian site of Lyngen are therefore largely the result of local demand.
Finally, most questionnaire surveys are preceded by interviews, which inform both the style and substance of the questionnaire. Given the impossibility of conducting such interviews in all nine countries of the programme, prior to the questionnaire campaign, the researchers designed the questionnaire based on their own experience in the fields of social perception of natural risks and in survey techniques. Their position, in terms of risk perception, was one of geographers and psychologists of natural risk, based on a classic distinction between hazard and risk (a combination of hazard and vulnerability). They were interested in perception and "social representations" of the risk and in resultant behaviours (De Rosa 2013; Goeldner-Gianella et al. 2015; Mei et al. 2013; Rüstemli and Karanci 1999; etc.). The techniques in question were well-known and widely used (Berthier 2002; Goeldner-Gianella and Humain-Lamoure 2010).
Methods used for the ASTARTE survey in Lyngen
This paper sets out the data collected from inhabitants and tourists in the municipality of Lyngen. As recommended by Bird concerning natural hazards (Bird 2009), a questionnaire was designed to acquire information on the public perception of the potential rockslide tsunami. A single questionnaire was used in all the European countries covered by the ASTARTE project, although it also included a few specific questions for each test site. Its content was partly based on the model put forward by Bird and Dominey-Howes 2007. Almost 1,400 people were surveyed between spring 2014 and autumn 2015, including 99 people on the banks of fjord Lyngen in June 2014. The number of people surveyed in Norway may seem relatively low (approximately 3% of the local population), but this is due to the low population density, the fact that only one person per family was questioned and the low acceptance of participation, in English or even in Norwegian. This low participation may be due to a certain lack of interest in the survey's theme or to the lower level of education in the municipality: 41.7% of the Lyngen population (16 years and over) has a level of education "below upper secondary education" compared with only 27.3% in Norway (www.ssb.no/en/. The questionnaire took between 15 and 30 minutes in most cases, and comprised around 50 questions, most of which were closed questions although there were a few open questions. They covered the respondents' relationship with the site, their knowledge of the tsunami hazard, their conduct in the event of a tsunami, their awareness and opinion of the alert, and finally, some personal data. Because the questionnaire had not been tested on the Norwegian site, it was revised and completed with subject-specialist Norwegian researchers shortly before its implementation. They added five questions relevant to the site, based on the feeling of threat and the levels of information, surveillance and emergency procedures put in place locally. After the field works, a statistical analysis was carried out for frequency distribution and cross-tabulation, backed up by chi-squared testing.
Profile of the surveyed people in the Lyngen survey (inhabitants, local workers and tourists; n=99, in %)
Why are you here?
I work here (but don't live here)
I'm on holiday/I'm visiting
I live here
Ages distribution (according to Norwegian statistics)
0 to 15 years old
16 to 22 years old
23 to 66 years old
67 years old and more
How long have you lived or been here?
a few hours or days
less than 1 year
1 to 5 years
5 to 10 years
more than 10 years
From another country (concerned by the ASTARTE survey)
From another country (not concerned by the ASTARTE survey)
A well-known hazard in the Norwegian study site in comparison with other European sites
However, it is worth noting that 30% did not respond or did not know how to respond to the question on the general causes of a tsunami and that a quarter did not respond or did not know how to respond to this question specifically in relation to Lyngen. Knowledge of tsunamis is, for 70%, acquired from television2 (especially by tourists), 13% from school and 10% from intense media coverage after the tragedies of 2004 and 2011 in the Indian Ocean and Japan. Only 2% of surveyed people said they had acquired such a knowledge through "public information", which exists in Lyngen, as we know.
Tsunami remains an unfamiliar hazard for tourists
To the question "What could the maximum tsunami wave height be in this area?", many local workers (79%) and inhabitants (72%) estimate that wave height may exceed 10 m - which is actually the case in this very specific context – while tourists are just as likely to opt for this wave height (37%) as they are to admit that they do not know (37%). There is accordingly a clear gap between tourists and non-tourists, illustrating in several respects the lack of knowledge among tourists concerning the local tsunami hazard. This lack of knowledge among tourists was clearly highlighted in the whole ASTARTE survey, in particular for tourists at the Spanish study resort (Goeldner-Gianella et al. 2015).
A certain lack of knowledge concerning the warning system
Classification of the answers to the question "What kind of information do you expect from a tsunami warning system?"
Time available for evacuation
Where to go (mountain, ferry and beyond, refuge areas)
Explanations on the event
Behavior to be adopted
Other informations (on alert, contacts, controls)
Which roads ?
In conjunction with these uncertainties, the local population is not really prepared for the risk. To the question "Have you made arrangements or prepared equipment to protect yourself (at home or at work) from a tsunami?", only 5% of inhabitants say that they have, while nearly 80% of them and 30% of local workers have not. What is more, a third of the local workers and 70% of inhabitants do not know "how they could better prepare" for this risk5. This general lack of preparation could be linked with the fact that evacuation will not be immediate, in the case of a rockslide tsunami, but also with a certain "risk denial". Indeed, 64% of the people interviewed "don't feel threatened by the Nordnes Mountain": 74% of them "rarely" or even "never think about this threat". Since the 1970s, the scientific literature has been full of examples showing that the denial of risk or threat, or "unrealistic optimism" in the face of risk (Sattler et al. 2000), is extremely widespread (Burton et al. 1978). This denial is considered, like fatalism, as a form of "non-protective response" to the threat, enabling us, like protective responses, to reduce the degree of threat appraisal (Grothmann and Reusswig 2006). For example, people living in regions exposed to seismic threat will deny or minimise this to calm their anxiety or because they feel unable to do anything to deal with it (Heller et al. 2005). The responses obtained in Lyngen are also doubtless consistent with this theory.
An average level of confidence in risk management and local risk managers
Evaluation by the inhabitants and the local workers of the government's surveillance of the mountain and of the local government's given information
"How do you evaluate the governement's surveillance of the Nordnes mountain?" (in %)
"The local governement is adequately informing us about the rockslide stability?" (in %)
Good to very good
Agree and completely agree
Neither bad, neither good
Neither agree, neither disagree
Bad to very bad
Disagree and completely disagree
Classification of the inhabitants’ and local workers’ answers to the question "If yes (if there is a tsunami warning system), who is responsible for giving the alert?"
Other (dispersed) answers
Is the local population as well informed and confident as the municipal authorities believe?
Despite the efforts made by the local and national authorities (e.g. information provided in town halls, press articles, the evacuation drill in 2013, etc.), the information has not reached the whole local population: a number of local inhabitants do not know how much time is available for evacuation, and are unaware that a warning system exists or how they would evacuate. What is more, a very large majority of inhabitants (80%) have neither made arrangements nor prepared any equipment for the tsunami risk.
Answers to the question "How did you hear or learn the word tsunami?"
Media coverage after a tsunami
Word "tsunami" never heard
Answers to the question "Are preparation measures against a tsunami satisfactory in (each study site)?"
Recommendations to raise awareness of the tsunami risk among tourists
This fjord region draws many tourists, especially from Scandinavia and Russia, who come here for various sports activities (fishing, hiking, running, cycling, Nordic skiing, etc.). In the ASTARTE survey, the Norwegian tourists however form the majority, with only six tourists from other origins. It is important to raise awareness of the flodbølge hazard among the tourist group in general, so as not to raise fears unnecessarily or reduce the area's appeal. Tourists are a specific population group, a significant portion of which may not be sensitive to risks of any kind (Seabra et al. 2013). For instance, in the case of tsunami risk, Johnston et al. have clearly shown how a large part of visitors to coastal Washington had not seen the tsunami hazard maps and was unaware of the tsunami warning system (Johnston et al. 2002), and that levels of staff training and preparedness for tsunami hazards were generally low, in particular in small hotels and guest houses (Johnston et al. 2007). In Lyngen, we have seen that the interviewed tourists had a very different awareness and perception of the tsunami risk compared to the people living or working there: tourists are more concerned about the risk of avalanche because Lyngen is a popular Nordic skiing destination and avalanches are a major and well-known risk for Norway. But they are not aware that Lyngen could be affected by a tsunami in the future and they are unfamiliar with the tsunami warning system and the time available for evacuation. Finally, they would not know how to evacuate, since the only information available to them is in town halls and other public service sites.
It would therefore seem necessary to raise awareness of the tsunami risk among this population group as a matter of urgency, because 52% of them come to Lyngen several times a year. One simple means of communication, suitable for these non-residents, would be issuing information on the ferry that connects Lyngseidet to the villages on the eastern banks of the fjord, giving people thirty to sixty minutes to read an information leaflet or a poster on the local potential tsunami risk, and what to do in case of an alert. It would also certainly be useful to raise awareness among tourism suppliers, as highly recommended on other touristic coasts (Johnston et al. 2007; Rittichainuwat 2013; Virapart 2011), and, if necessary, allay any anxieties they may themselves have because "crisis management [often] creates unwanted safety concerns" (Rittichainuwat 2013).
With respect to the question of knowing whether "the Lyngen population is as well-informed about the tsunami risk in general and about the potential evacuation time in particular", the survey conducted in Lyngen demonstrates that the local population has a fairly clear perception of the tsunami hazard, associated with the potential rockslide from a flank of the mountain into the fjord. However, a number of local inhabitants do not know how much time is available for evacuation, and are unaware that a warning system exists or how they would evacuate. What is more, a very large majority of inhabitants (80%) have neither made arrangements nor prepared any equipment for the tsunami risk. The warning and evacuation system introduced over the past few years thus do not appear to be sufficiently well-known and the population is not sufficiently prepared for evacuation, despite the communication work already done by the local and national authorities. Hence, the municipal authorities have still to improve and increase the dissemination of the information, even if it does already exist.
Regarding the question of whether "the Lyngen population is as confident as the local municipality hopes", the survey shows an average degree of trust in local authorities among the people interviewed in Norway. This confidence is higher in respect of hazard surveillance than in the information delivered on risk or its management. However, the population interviewed in Lyngen compared to the population interviewed in other European countries is by far the most satisfied with the measures taken to address the tsunami hazard – especially among inhabitants and local workers – and, alongside Portugal, the most aware of these specific measures. This greater confidence in local authorities, if examined on a European scale, can only motivate the municipal authorities to improve the quality of information delivered locally, which is still inadequate in some regards.
And in respect of whether "there is enough information on the tsunami risk for tourists", the survey shows for national or international tourists that they are, as is the case elsewhere, less informed about local natural hazards and evacuation conditions. In fact, the tourists interviewed in Lyngen had a very different awareness and perception of the tsunami risk compared to the people living or working there: tourists more concerned about the risk of avalanche are not aware that Lyngen could be affected by a tsunami in the future and are unfamiliar with the tsunami warning system and the time available for evacuation. Finally, they would not know how to evacuate. Thus, it would appear necessary to improve the information available to them, without however harming the tourist sector that forms one of the region’s few economic activities. The challenge here is not so much to inform them of the necessity to evacuate urgently, as on the Mediterranean beaches, but to inform them of a possible evacuation during their stay. It is especially important to spread the information on tsunamis in Norway because residents or tourists – on land and on cruise boats – are currently increasing in numbers in the fjords. Furthermore, the rockslide tsunami hazard should itself increase in the future due to the specific consequences of climate change.
In addition, nowadays in Lyngen, natural risks do not originate solely from the sea, but also from the land: there are other risks inland, related to climate change and with potentially serious coastal human impacts, namely the melting of the permafrost and glaciers (Jackson and Ragulina 2014). As such, future communication on hazards in Lyngen should not focus only on rockslide tsunamis and their impact on the coast; it should also encompass, besides the recurring and well-known risks of avalanches and snowstorms, the more recent hazards associated with climate change.
Examples of this include the TV miniseries "Tsunami: the Aftermath" by B. Nalluri, released in 2006, the Japanese documentary "The Tsunami and the Cherry Blossom", directed by L. Walker in 2011 and nominated for the documentary category at the 2012 Oscars, and the film "The Impossible" by J.A. Bayona, released in 2012.
Nonetheless, inhabitants and local workers appear to be less "well-informed" about past events than the future situation.
The tsunami wave should arrive in approximatively 2 mn in Lyngseidet and 3 mn in Olderdalen (NGI).
In the case of a predictable rockslide tsunami, such a preparation consists in setting aside important documents, having at home a kit of rescue or eventually a boat.
The authors thank the two reviewers whose comments and suggestions contributed to the improvement of the manuscript. The authors also thank the persons who provided them with scientific comments or local support and information: C.B. Harbitz, NGI; H.E. Grønaas, Municipality of Lyngen; H.C. Vangberg, University Hospital of North Norway; J.A. Terum, UiT: The Arctic University of Norway.
This research work was supported by the ASTARTE project – Assessment, Strategy And Risk Reduction for Tsunamis in Europe – FP7-ENV2013 6.4-3, Grant 603839. The funding body has played no role in the design of the study, the collection, analysis and interpretation of data, or the writing of the manuscript.
Availability of data and materials
The dataset supporting the conclusions of this article is included within the article.
LG-G: survey’s conception, survey in the field in English, survey’s analysis, manuscript's redaction and corrections. DG: survey’s conception, statistical treatment, survey’s analysis. ØR: survey’s conception, survey in the field in Norwegian, manuscript's corrections. BA: survey in the field in Norwegian. DB: Fig. 11. FL: survey’s conception, survey in the field in English. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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