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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Relationships between along-fault heterogeneous normal stress and fault slip patterns during the seismic cycle: Insights from a strike-slip fault laboratory model
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Relationships between along-fault heterogeneous normal stress and fault slip patterns during the seismic cycle: Insights from a strike-slip fault laboratory model

机译：地震循环期间故障异构正常应力和故障滑动模式之间的关系：防撞故障实验室模型见解

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摘要

We use a strike-slip fault analog model to study experimentally the role played by along-fault nonuniform and asymmetric applied normal stress on both coseismic slip and long-term fault behavior. Our model is based on a visco-elasto-plastic multi-layered rheology that allows to produce several hundreds of scaled analog microquakes and associated seismic cycles. Uniform or heterogeneous applied normal stress along the fault plane is imposed and maintained constant during the whole experiment durations. Our results suggest that coseismic slip patterns are strongly controlled by spatial normal stress variations and subsequent accumulated shear stress along fault strike. Major microquakes occur preferentially in zones of major shear stress asperities. Coseismic slip distributions exhibit a pattern similar to the along-fault applied normal stress distribution. The occurrence of isolated low to moderate microquakes where residual stresses persist around secondary stress asperities, indicates that stress conditions along the fault also control the whole variability of fault slip events. Moreover, when fault slip stability conditions are modulated by normal stress distribution, our experiments suggest that the along fault stress heterogeneity influences the seismic cycle regularity and, consequently, long-term fault slip behavior. Uniform applied normal stress favors irregular seismic cycles and the occurrence of earthquakes clustering, whereas non-uniform normal stress with a single high amplitude stress asperity generates strong characteristic microquake events with stable return periods. Together our results strengthen the assumption that coseismic slip distribution and earthquake variability along an active fault may provide relevant information on long term tectonic stress and could thus improve seismic hazard assessment. (C) 2017 Elsevier B.V. All rights reserved.
机译：我们使用防滑故障模拟模型来实验研究，沿着故障的非均匀性和不对称应用正常应力在电动发电机滑动和长期故障行为上进行的作用。我们的型号基于粘性塑料多层流变学，允许生产数百种缩放的模拟微版和相关地震循环。在整个实验持续时间内施加沿着断层平面的均匀或异质施加的正常应力并保持恒定。我们的研究结果表明，通过空间正常应力变化强烈控制电动滑动模式，随后沿着故障击球的累积剪切应力强烈控制。主要微型样品优先发生在主要剪切应力粗糙的区域中。电动滑动分布显示出类似于沿着故障施加的正常应力分布的图案。分离低至中等微型水分的发生，其中残余应力仍然存在于二次应力粗糙度，表明沿着故障的应力条件也控制了故障滑移事件的整体变化。此外，当通过正常应力分布调节故障稳定性条件时，我们的实验表明沿着故障应力异质性影响地震循环规律性，因此，长期故障滑动行为。均匀的施加正常应力有利于不规则的地震循环和地震聚类的发生，而单个高幅度应力的不均匀正常应力随着稳定的返回时期产生强大的特征微示例。我们的结果加强了沿着主动故障的电影滑动分布和地震变异性的假设可以提供有关长期构造应力的相关信息，从而可以改善地震危害评估。 （c）2017年Elsevier B.V.保留所有权利。

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