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Improving the effectiveness of earthquake early warning systems

May 21, 2024
in Science
Improving the effectiveness of earthquake early warning systems
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Improving the effectiveness of earthquake early warning systems

Despite the widespread use of mobile phones for delivering emergency alerts, current systems do not prompt recipients to take protective action. By examining people’s responses to alerts, the researchers propose several measures to enhance the effectiveness of alert systems. Credit: Flash Flood Warning- Cell Phone Wireless Emergency Alert / Tony Webster

Mobile phones have become invaluable for receiving emergency alerts such as weather warnings, evacuation notices and notifications about missing persons. In Japan, where earthquakes are frequent, they are vital for delivering earthquake warnings and advising people to take protective actions beforehand.

To deal with such situations promptly, the Earthquake Early Warning (EEW) system sends out notifications to areas expected to experience strong tremors by detecting primary seismic waves (P-waves) that arrive before the secondary waves (S-waves). However, the short time between receiving the notification and the arrival of S-waves requires immediate response from individuals in affected areas.

But this is not always the case as Professor Kazuya Nakayachi from the Faculty of Psychology, Doshisha University, Japan, explains, “Designers of the disaster information system assume that those who receive an emergency alert will immediately take protective action, but this is rarely the case. People stay still looking at their cell phone screens receiving the alert.” Surveys conducted in Japan found that despite advanced warnings, people fail to take protective actions.

To determine why individuals might not act upon receiving such warnings delivered through mobile phones, Prof. Nakayachi, along with Dr. Ryosuke Yokoi from Kyoto Tachibana University and Dr. James Goltz from Kyoto University conducted two surveys, investigating people’s responses immediately after receiving EEW alerts on their mobile phones between 2021 and 2023.

Their findings, published online in the International Journal of Disaster Risk Reduction on 15 April 2024, aim to improve the effectiveness of EEW alerts to reduce the risk of injury or fatalities during earthquakes.

The researchers collected responses from participants affected by the 6.0 magnitude earthquake in Chiba Prefecture, which occurred on October 1, 2021, and the 6.3 magnitude earthquake in Ishikawa Prefecture on May 5, 2023. To determine the initial reactions to the alerts, the participants were asked the following question: “When you received the EEW alert on your mobile phone, what did you do first and what did you do next?”

Out of 3,000 participants who experienced the earthquake at Chiba, about 34% said that their first reaction was to pay attention to their mobile phones by listening to the alert or checking the screen.

Out of the 829 participants who checked their phone screens as their first reaction, only 51 participants said that they took protective measures as their second reaction. But, 36% of the participants said that they did not take any action upon receiving the alert. Instead, they waited for the tremors to begin and stayed still. Only 7% took immediate steps to protect themselves, and 10% listed protective actions as their second response.

Similar reactions were observed in the group from Ishikawa Prefecture. Out of 1,000 responses, 46% of participants reported paying attention to their mobile phones as their first reaction, with only 20 participants taking protective measures as their second reaction. Additionally, 30–40% of participants did not take any protective actions, and less than 10% acted immediately upon receiving the EEW alert. The results suggest that the EEW alert was ineffective at prompting the intended response from the recipients.

To address this, the researchers suggest three measures. First, to prevent people from wasting time unnecessarily looking at their phones for more information, they propose conducting nationwide emergency drills to train people to react immediately when they receive EEW alerts on their phones.

Second, they recommend maintaining a safe environment at home, work, and school by securing furniture and storing heavy items near the ground. This can help protect people when it is difficult to take protection actions during an earthquake. Lastly, the researchers suggest that adding clear instructions like ‘protect yourself now’ to EEW alert messages would encourage people to react immediately.

With the widespread availability of mobile phones, many governments are increasingly sending alerts through these devices. However, as the study shows, it is not just about delivering the message; the system needs to ensure that the alert motivates people to act.

“To improve the effectiveness of warning systems, researchers and practitioners should consider not only the delivery of warnings to the public but also track their behavioral and psychological reactions after receiving these warnings,” says Prof. Nakayachi.

More information:
Kazuya Nakayachi et al, Human behavioral response to earthquake early warnings (EEW): Are alerts received on mobile phones inhibiting protective actions?, International Journal of Disaster Risk Reduction (2024). DOI: 10.1016/j.ijdrr.2024.104401

Citation:
Improving the effectiveness of earthquake early warning systems (2024, May 21)
retrieved 21 May 2024
from https://phys.org/news/2024-05-effectiveness-earthquake-early.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Phys.org – https://phys.org/news/2024-05-effectiveness-earthquake-early.html

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