Delay times of worldwide global earthquake alerts |
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Authors: | Max Wyss Marine Zibzibadze |
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Institution: | (1) World Agency of Planetary Monitoring and Earthquake Risk Reduction, Geneva, Switzerland;(2) Seismic Monitoring Center, Tbilisi, GA, USA |
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Abstract: | Quantitative estimates of earthquake losses are needed as soon as possible after an event. A majority of earthquake-prone
countries lack the necessary dense seismograph networks, modern communication, and in some places the experts to assess losses
immediately, so the earliest possible warnings must come from global information and international experts. Earthquakes of
interest to us are in most areas of the world M ≥ 6. In this article, we have analyzed the response time for distributing source parameter estimates from: National Earthquake
Information Center (NEIC) of the US Geological Survey (USGS), the European Mediterranean Seismological Center (EMSC), and
Geophysical Institute-Russian Academy of Science, Obninsk (RAS). In terms of earthquake consequences, the Pacific Tsunami
Warning Center (TWC) issues assessments of the likelihood of tsunamis, the Joint Research Laboratory in Ispra, Italy (JRC)
issues alerts listing sociological aspects of the affected region, and we distribute loss estimates, and recently the USGS
has started posting impact assessment information on their PAGER web page. Two years ago, the USGS reduced its median delay
of distributing earthquake source parameters by a factor of 2 to the currently observed 26 min, and they distribute information
for 99% of the events of interest to us. The median delay of EMSC is 41 min, with 30% of our target events reported. RAS reports
after 81 min and 30% of the target events. The first tsunami assessments by TWC reach us 18 min (median) after large earthquakes
in the Pacific area. The median delay of alerts by the JRC is 44 min (36 min recently). The World Agency for Planetary Monitoring
and Earthquake Risk Reduction (WAPMERR) distributes detailed loss estimates in 41 min (median). Moment tensor solutions of
the USGS, which can be helpful for refining loss estimates, reach us in 78 min (median) for 58% of the earthquakes of interest. |
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Keywords: | Earthquake alerts Tsunami alerts Real-time earthquake loss estimates |
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