近场强地震动断层面不均匀位错预测模型

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (14) : 171-175.

论文

近场强地震动断层面不均匀位错预测模型

郑山锁，徐强，李磊，杨威，孙龙飞

作者信息 +

Near-field strong ground motion predicting model for the inhomogeneous distribution of the fault

ZHENG Shan-suo，XU Qiang，LI Lei，YANG Wei，SUN Long-fei

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文章历史 +

摘要

断层破裂面不均匀位错空间分布会强烈影响近场强地震动强度及频谱特性。为描述断层破裂面位错不均匀性，设断层子源划分与地震矩无关，采用分形法划分子源，避免子源相互重叠或覆盖；设应力降不为常数修正自相似模型，获得子源断层位错与整体断层位错关系，改进已有凹凸体模型。以美国北岭地震为例，预测断层破裂面位错不均匀性，对比震后反演情况，验证预测模型的有效性。

Abstract

The space distribution of inhomogeneous dislocation on the fault has strong influence on the strength and spatial change of the near-field strong ground motion. The parameters of finite faults source model were divided into global source parameters and local source parameters. Global source parameters describe the macro feature of the fault, and local source parameters describe the inhomogeneous distribution of dislocation on the fault fracture surface. In order to describe the inhomogeneous distribution of the fault，assuming that fault subevents division has nothing to do with the seismic moment, fractal method is used to delimit the subevents to avoid overlapping or covering；assuming that stress drop is not constant to correct self-similar model，the relation between subevents and fault was getted to improve of existing asperity model. Finally taking the northridge earthquake for example， the inhomogeneous distribution of the fault was predicted to verify the validity of the prediction model compared to actual situation after the earthquake.

导出引用

郑山锁;徐强;李磊;杨威;孙龙飞. 近场强地震动断层面不均匀位错预测模型[J]. 振动与冲击, 2014, 33(14): 171-175

ZHENG Shan-suo;XU Qiang;LI Lei;YANG Wei;SUN Long-fei. Near-field strong ground motion predicting model for the inhomogeneous distribution of the fault [J]. Journal of Vibration and Shock, 2014, 33(14): 171-175