Long-distance earthquake triggering restricted to small events
Nature Geoscience
2011년3월28일
After a large earthquake, the regional hazard of yet more large earthquakes is increased but the global hazard is not, suggests a study online this week in Nature Geoscience. In the vicinity of an earthquake, the risk of strong subsequent shaking is raised after the event, but beyond a threshold distance only small follow-up earthquakes seem to be triggered.
Tom Parsons and Aaron Velasco assembled a 30-year catalogue of all earthquakes greater than magnitude 5 that, according to relative timing, could have been triggered by a preceding shock of magnitude 7 or larger. They find that the increase in seismic hazard associated with large earthquakes is confined to a radius around the main quake’s epicenter of about two to three times the length of its rupture.
doi: 10.1038/ngeo1110
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