April 19, 2013
Measuring The Hazards Of Global Aftershock
News from the Seismological Society of America 2013 Annual Meeting
The entire world becomes an aftershock zone after a massive magnitude (M) 7 or larger earthquake–but what hazard does this pose around the planet? Researchers are working to extend their earthquake risk estimates over a global scale, as they become better at forecasting the impact of aftershocks at a local and regional level.
Studies of hundreds of M7 mainshock earthquake effects in 21 different regions around the world has provided some initial insights into how likely a damaging global aftershock might be. Initial results show that remote triggering has occurred at least once in about half of the regions studied during the past 30 years. Larger (M>5) global aftershocks appear to be delayed by several hours as compared with their lower magnitude counterparts. Parsons suggests that local seismic networks can monitor the rate of seismic activity immediately after a global mainshock quake, with the idea that a vigorous uptick in activity could signal a possible large aftershock.
Parsons presented his research at the annual meeting of the Seismological Society of America, which is an international scientific society devoted to the advancement of seismology and the understanding of earthquakes for the benefit of society. It publishes the prestigious peer-reviewed journal BSSA — the Bulletin of the Seismological Society of America — and the bimonthly Seismological Research Letters, which serves as a general forum for informal communication among seismologists and those interested in seismology and related disciplines.
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