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arXiv 1812.08005physics.geo-ph
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Landers地震后库仑应力对Gutenberg-Richter定律无显著影响

No Significant Effect of Coulomb Stress on the Gutenberg-Richter Law after the Landers Earthquake

Víctor Navas-Portella, Abigail Jiménez, Álvaro Corral

摘要:

库仑应力理论多年来一直用于地震学,以了解地震如何相互触发。每当地震发生时,应力场发生变化,正增加的地方更接近于破坏。将地震率与主震后的库仑应力联系起来的地震模型,如速率-状态模型,假设地震的震级分布不受库仑应力变化的影响。利用不同的滑动模型,计算了Landers事件(1992年,美国加利福尼亚州,矩震级7.3)后每次余震的断层面库仑应力的变化。应用几个统计分析来测试幅度的分布是否对库仑应力增加的符号敏感,我们得出结论,没有观察到显着的影响。此外,而事件与正增加的应力的特点是由一个更大的比例的走滑事件的地震活动之前的主震相比,尽管库仑应力减少发生的事件显示没有相关的差异,在震源机制分布相对于以前的地震活动。

英文摘要:

Coulomb-stress theory has been used for years in seismology to understand how earthquakes trigger each other. Whenever an earthquake occurs, the stress field changes, and places with positive increases are brought closer to failure. Earthquake models that relate earthquake rates and Coulomb stress after a main event, such as the rate-and-state model, assume that the magnitude distribution of earthquakes is not affected by the change in the Coulomb stress. By using different slip models, we calculate the change in Coulomb stress in the fault plane for every aftershock after the Landers event (California, USA, 1992, moment magnitude 7.3). Applying several statistical analyses to test whether the distribution of magnitudes is sensitive to the sign of the Coulomb-stress increase we conclude that no significant effect is observable. Further, whereas the events with a positive increase of the stress are characterized by a much larger proportion of strike-slip events in comparison with the seismicity previous to the mainshock, the events happening despite a decrease in Coulomb stress show no relevant differences in focal-mechanism distribution with respect to previous seismicity.

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