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How near misses influence disaster decision-making 

Narrowly avoiding a close call with a disaster might make people more likely to evacuate or prepare for the next one. Or it might not. Risk perception can be a fickle concept based on a number of personal factors, but research also shows the nature of that ‘near miss’ plays an important role, writes Robin Dillon-Merrill in this blog initially published by the Natural Hazards Center, USA.  

In their 1998 Coastal Management publication, Kirstin Dow and Susan Cutter examined evacuation behaviour during Hurricane Bertha and, subsequently, Fran in 1996 to see if they would find a ‘cry wolf’ effect after Bertha missed South Carolina and struck North Carolina instead. Their study ultimately did not find evidence of such an effect and determined that the ‘premature evacuations’ for Bertha in South Carolina only played a minor role in evacuation decisions for Fran.

Building on this seminal research, we further examined the role of near-miss events in individual decision making to prepare – or not – for natural hazards.

What we learned was that decision-making can be highly nuanced. How people integrate factors – including their personal experiences with previous storms and characteristics of the current storm – in calculating risk is critical to determine the preparedness actions they might take.

In our work, we define a ‘near miss’ as an event in which a person has a non-trivial expectation of experiencing disaster but, by chance, does not. Our natural environment produces many examples of near misses, such as when a random tree pattern saves a house from a mudslide, or a hurricane weakens right before it hits a city. What is critical is how people interpret these events because every near-miss event has some plasticity in interpretation – it can be taken as either evidence of the seriousness of the threat or of its irrelevance.

We categorise near misses as either vulnerable (where the avoidance of a disaster results in a perceived vulnerability of the system) or resilient (where avoidance of a disaster results in a perceived resilience of the system).

Near-miss events in a context where people escape harm can sometimes seem to imply resiliency because no damage was done. Our research shows that these near-miss experiences can lead to riskier behaviour. On the other hand, when people understand a near-miss as a disaster that ‘almost happened’, rather than a disaster that was avoided, then this could be associated with vulnerability. Our research shows that people who frame their disaster experience as a resilient near miss will be less likely to mitigate against impending hazards than people without this frame.

When a near-miss experience highlights the harm the event could have been caused, however, it adds information that counteracts the basic resilient near-miss effect. That is, a near miss that causes no harm can make the hazard seem less threatening, but the presence of harm creates associations with vulnerability. Thus, people with vulnerable near-miss information (which highlights how an event almost caused harm) will be more likely to take mitigating action for an impending hazard than people with resilient near-miss information.

Consistent with other research in decision-making, our results suggest people are heavily influenced by previous outcomes. Past near-miss experiences shape how people explicitly judge risk and take mitigation and preparedness action.

Remember, risk is a function of the likelihood of an event and its consequences. We believe the mechanism driving people’s behaviour is their perception of danger or the consequences, which stems directly from the influence of a near-miss influence on their memory, rather than a changed assessment of the likelihood of an event.

Finally, previous hazard research has shown that people’s mitigation activity depends, in part, on what their neighbours decide to do. Research that considers how near misses influence group decision-making is a logical next step. If some decision-makers experienced resilient near-misses while others experienced vulnerable near-misses, which one would dominate when these experiences are shared? This research question should be explored further.

Understanding how near-misses impact behaviour and decision-making is vital to organisations responsible for informing the public about hazards. For example, those that educate the public about natural disasters may assume people will respond uniformly to facts about the costs and probability of future events.

Our results suggest otherwise. Specifically, the same objective facts about the costs and statistically calculated risk of impending hazards will be evaluated differently by different people, depending on their own near-miss experiences. Therefore, such facts may be insufficient for producing action. Instead, the narrative that accompanies these facts (including vulnerable or resilient near-miss information) can impact reactions to hazards. For those who experience resilient near misses, it might also be necessary to supplement information on possible harm to enhance their hazard decision-making.

Republished from the Univerity of Colorado Natural Hazards Center, click here for more details 

Robin Dillon-Merrill, 17/04/2020
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