地球潮汐能够引发浅部逆冲断层地震。

Earth tides can trigger shallow thrust fault earthquakes.

作者信息

Cochran Elizabeth S, Vidale John E, Tanaka Sachiko

机构信息

Department of Earth and Space Sciences and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095, USA.

出版信息

Science. 2004 Nov 12;306(5699):1164-6. doi: 10.1126/science.1103961. Epub 2004 Oct 21.

DOI:10.1126/science.1103961

PMID:15498971

Abstract

We show a correlation between the occurrence of shallow thrust earthquakes and the occurrence of the strongest tides. The rate of earthquakes varies from the background rate by a factor of 3 with the tidal stress. The highest correlation is found when we assume a coefficient of friction of mu = 0.4 for the crust, although we see good correlation for mu between 0.2 and 0.6. Our results quantify the effect of applied stress on earthquake triggering, a key factor in understanding earthquake nucleation and cascades whereby one earthquake triggers others.

摘要

我们展示了浅冲断层地震的发生与最强潮汐的发生之间的相关性。地震发生率与背景发生率相比，因潮汐应力而变化了3倍。当我们假设地壳的摩擦系数μ = 0.4时，发现相关性最高，尽管我们也看到μ在0.2到0.6之间时相关性也很好。我们的结果量化了施加应力对地震触发的影响，这是理解地震成核和级联（即一次地震引发其他地震）的关键因素。