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Conditions for the occurrence of seismic sequences in a fault system

机译：故障系统中地震序列发生的条件

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摘要

We consider a fault system producing a sequence of seismic events of similar magnitudes. If the system is made up of n faults, there are n! possible sequences, differing from each other for the order of fault activation. Therefore the order of events in a sequence can be expressed as a permutation of the first n integers. We investigate the conditions for the occurrence of a seismic sequence and how the order of events is related to the initial stress state of the fault system. To this aim, we consider n coplanar faults placed in an elastic half-space and subject to a constant and uniform strain rate by tectonic motions. We describe the state of the system by n variables that are the Coulomb stresses of the faults. If we order the faults according to the magnitude of their Coulomb stresses, a permutation of the first n integers can be associated with each state of the system. This permutation changes whenever a fault produces a seismic event, so that the evolution of the system can be described as a sequence of permutations. A crucial role is played by the differences between Coulomb stresses of the faults. The order of events implicit in the initial state is modified due to changes in the differences between Coulomb stresses and to different stress drops of the events. We find that the order of events is determined by the initial stress state, the stress drops and the stress transfers associated with each event. Therefore the model allows the retrieval of the stress states of a fault system from the observation of the order of fault activation in a seismic sequence. As an example, the model is applied to the 2012 Emilia (Italy) seismic sequence and enlightens the complex interplay between the fault dislocations that produced the observed order of events.
机译：我们考虑一种产生类似幅度的地震事件序列的故障系统。如果系统由n个故障组成，则存在n！可能的序列，为故障激活的顺序彼此不同。因此，序列中的事件的顺序可以表示为第一n整数的置换。我们研究了发生地震序列的情况以及事件的顺序与故障系统的初始应力状态有关的条件。为此，我们认为N共面故障放置在弹性半空间中，并通过构造动作达到恒定和均匀的应变率。我们通过N个变量描述了系统的状态，这是故障的库仑应力。如果我们根据其库仑应力的幅度订购故障，则第一n整数的置换可以与系统的每个状态相关联。每当故障产生地震事件时，这种置换变化，使得系统的演化可以被描述为序列序列。缺陷骨隙应力之间的差异起到了至关重要的作用。由于库仑应力与事件的不同压力下降，因此修改了初始状态中隐含的事件的顺序。我们发现事件的顺序由初始应力状态决定，应力下降和与每个事件相关联的应力转移。因此，该模型允许从地震序列中观察故障激活量的观察来检索故障系统的应力状态。作为示例，该模型应用于2012年艾米利亚（意大利）地震序列，并启示了产生所观察到的事件顺序的故障位错之间的复杂相互作用。

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  • 来源
    《Nonlinear processes in geophysics》 |2016年第5期|共15页
  • 作者

    Dragoni Michele; Lorenzano Emanuele;

  • 作者单位

    Alma Mater Studiorum Univ Bologna Dipartimento Fis &

    Astron Viale Carlo Berti Pichat 8 I-40127 Bologna Italy;

    Alma Mater Studiorum Univ Bologna Dipartimento Fis &

    Astron Viale Carlo Berti Pichat 8 I-40127 Bologna Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
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