台湾双冬断层近场脉冲型地震动的数值模拟
根据我国台湾地区西部的地质地貌特征和1999年集集MW7.6地震的震源参数,建立了三维速度结构模型和两类震源模型。基于地壳中断层的位错积累量和岩石破裂后应力应变的传播特性,采用三维有限差分法对双冬断层活动可能产生的近场脉冲型地震动进行了模拟研究。结果表明:走滑断层垂直于断层走向的水平分量和逆断层垂直分量的峰值速度较大;由方向性效应所产生的双向速度脉冲主要集中在垂直于断层滑动分量方向,而由滑冲效应所产生的单向速度脉冲则主要集中在平行于断层滑动分量的方向;受方向性效应和上盘效应的共同制约,近场脉冲型地震动呈不对称带状分布,速度脉冲多分布在距离走滑断层迹线15 km和逆断层迹线10 km的范围内;速...
| Published in: | Dizhen xuebao |
|---|---|
| Main Authors: | Quanbo Luo, Xueliang Chen, Mengtan Gao, Tiefei Li |
| Format: | Article |
| Language: | Chinese |
| Published: |
Editorial Office of Acta Seismologica Sinica
2019-05-01
|
| Subjects: | |
| Online Access: | https://www.dzxb.org/10.11939/jass.20180103 |
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