Estimation of dynamic rupture parameters from the radiated seismic energy and apparent stress
Estimation of dynamic rupture parameters from the radiated seismic energy and apparent stress
复制标题
根据辐射地震能量和视应力估计动态破裂参数
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
K. Irikura
中科院分区：
文献类型：
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作者：
N. Pulido;K. Irikura
我们提出了一种新的方法，通过评估视应力的时空分布来估计临界滑动弱化距离Dc，该视应力是根据震源运动学反演获得的断层面上滑动速度函数的时空分布计算的。这一想法是基于这样一个事实：视应力可以与地震平均应力和破裂过程中断层面上的摩擦动应力之差有关。根据累积滑动-视应力关系，我们估计了1992年兰德斯地震的临界滑动，Dc。我们发现临界滑移弱化对破裂速度起着重要的控制作用。在兰德斯地震的情况下，中心段非常低的破裂速度可以通过该段主要粗糙体获得的大Dc值来解释。
We propose a new procedure for estimating the critical slip weakening distance, Dc, by evaluating the spatio‐temporal distribution of the apparent stress calculated from the spatio‐temporal distribution of the slip velocity function on the fault plane obtained from a kinematic inversion of the earthquake source. The idea is based on the fact that the apparent stress can be related to the difference between the earthquake average stress and the frictional dynamical stress on the fault plane during the rupture process. From the cumulative slip‐apparent stress relationship we estimate the critical slip, Dc, of the 1992 Landers earthquake. We find that the critical slip weakening plays an important role in controlling the rupture velocity. In the case of the Landers earthquake the very low rupture velocity in the central segment could be explained by the large Dc‐value obtained for the main asperity on that segment.