Short-Term Earthquake Forecasting Using Early Aftershock Statistics

被引:25
|
作者
Shebalin, Peter [1 ]
Narteau, Clement [2 ]
Holschneider, Matthias [3 ]
Schorlemmer, Danijel [4 ]
机构
[1] Int Inst Earthquake Predict Theory & Math Geophys, Moscow 117997, Russia
[2] Inst Phys Globe, Lab Dynam Fluides Geol, F-75252 Paris 05, France
[3] Univ Potsdam, Inst Appl & Ind Math, D-14115 Potsdam, Germany
[4] Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA
关键词
LAW; MODELS; DECAY; PREDICTION; STRESS; PREDICTABILITY; STRATEGIES; CALIFORNIA; MAGNITUDE; RATES;
D O I
10.1785/0120100119
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We present an alarm-based earthquake forecast model that uses the early aftershock statistics (EAST). This model is based on the hypothesis that the time delay before the onset of the power-law aftershock decay rate decreases as the level of stress and the seismogenic potential increase. Here, we estimate this time delay from < t(g)>, the time constant of the Omori-Utsu law. To isolate space-time regions with a relative high level of stress, the single local variable of our forecast model is the E-a value, the ratio between the long-term and short-term estimations of < t(g)>. When and where the E-a value exceeds a given threshold (i.e., the c value is abnormally small), an alarm is issued, and an earthquake is expected to occur during the next time step. Retrospective tests show that the EAST model has better predictive power than a stationary reference model based on smoothed extrapolation of past seismicity. The official prospective test for California started on 1 July 2009 in the testing center of the Collaboratory for the Study of Earthquake Predictability (CSEP). During the first nine months, 44 M >= 4 earthquakes occurred in the testing area. For this time period, the EAST model has better predictive power than the reference model at a 1% level of significance. Because the EAST model has also a better predictive power than several time-varying clustering models tested in CSEP at a 1% level of significance, we suggest that our successful prospective results are not due only to the space-time clustering of aftershocks.
引用
收藏
页码:297 / 312
页数:16
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