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首页> 外文期刊>Pure and Applied Geophysics >Cumulative Coulomb Stress Triggering as an Explanation for the Canterbury (New Zealand) Aftershock Sequence: Initial Conditions Are Everything?
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Cumulative Coulomb Stress Triggering as an Explanation for the Canterbury (New Zealand) Aftershock Sequence: Initial Conditions Are Everything?

机译：累积库仑应力触发解释了坎特伯雷（新西兰）余震序列：初始条件是一切吗？

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摘要

Using 2 years of aftershock data and three fault-plane solutions for each of the initial M7.1 Darfield earthquake and the larger () aftershocks, we conduct a detailed examination of Coulomb stress transfer in the Canterbury 2010-2011 earthquake sequence. Moment tensor solutions exist for 283 of the events with , while 713 other events of have only hypocentre and magnitude information available. We look at various methods for deciding between the two possible mechanisms for the 283 events with moment tensor solutions, including conformation to observed surface faulting, and maximum CFF transfer from the Darfield main shock. For the remaining events, imputation methods for the mechanism including nearest-neighbour, kernel smoothing, and optimal plane methods are considered. Fault length, width, and depth are arrived at via a suite of scaling relations. A large (50-70 %) proportion of the faults considered were calculated to have initial loading in excess of the final stress drop. The majority of faults that accumulated positive CFF during the sequence were 'encouraged' by the main shock failure, but, on the other hand, of the faults that failed during the sequence, more than 50 % of faults appeared to have accumulated a negative CFF from all preceding failures during the sequence. These results were qualitatively insensitive to any of the factors considered. We conclude that there is much unknown about how Coulomb stress triggering works in practice.
机译：针对最初的M7.1达菲尔德地震和较大的余震，使用2年余震数据和三个断层平面解，我们对2010-2011年坎特伯雷地震序列中的库仑应力传递进行了详细研究。存在283个事件的矩张量解，而其他713个事件仅具有震中和幅值信息。我们研究了多种方法来确定283个带有矩张量解的事件的两种可能机制，包括对观察到的表面断层的构造以及从达菲尔德主震中获得的最大CFF传递。对于其余事件，考虑了该机制的插补方法，包括最近邻居，核平滑和最佳平面方法。断层的长度，宽度和深度是通过一系列比例关系得出的。计算出所考虑的大部分断层（50-70％）的初始载荷超过了最终的应力降。序列中累积正CFF的大多数故障是由主震击穿“鼓励”的，但是，另一方面，序列中失败的故障中，超过50％的故障似乎累积了CFF的负值顺序中所有先前的失败。这些结果在质量上对所考虑的任何因素都不敏感。我们得出的结论是，对于库仑应力触发如何在实践中起作用尚有许多未知数。

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