| 断层几何形态对阿拉斯加中南部俯冲带慢滑移特征的影响 |
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| 引用本文： | 李昊天,周仕勇.断层几何形态对阿拉斯加中南部俯冲带慢滑移特征的影响[J].地震学报,2019,41(6):681-694. |
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| 作者姓名： | 李昊天 周仕勇 |
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| 作者单位： | 中国北京100871 北京大学地球与空间科学学院;中国北京100871 北京大学地球与空间科学学院 |
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| 基金项目： | 中国地震实验场（2016 368 CESE 0104）和国家自然科学基金（41674047）联合资助 |
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| 摘 要： | 本文采用三种不同的俯冲带几何模型，在速率-状态依赖型摩擦律和准动态算法的框架下，对阿拉斯加库克湾的慢滑移事件进行了数值模拟，以探究断层几何形状对慢滑移特征的影响。结果表明:几何因素对慢滑移的时空演化有较大影响；慢滑移区域的宽度对数值模拟的结果起着至关重要的作用；断层几何形态更平缓的区域将导致更大、更快的事件。这一结果有助于我们进一步了解慢滑移的成因以及断层几何形态对慢滑移时空演化的影响。
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| 关 键 词： | 慢滑移 阿拉斯加中南部俯冲带 断层几何效应 速率-状态依赖型摩擦律 |
| 收稿时间： | 2019-06-10 |
Fault geometric effects on characteristics of slow slip events in south-central Alaska |
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| Institution: | School of Earth and Space Sciences，Peking University，Beijing 100871，China |
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| Abstract: | The purpose of this paper is to explore the influence of the geometry of fault model on the characteristic values of slow slip events in numerical simulations. In this paper, three different subduction zone geometric models were used to numerically simulate slow slip events （SSEs） in Cook Inlet, Alaska in the framework of rate- and state-dependent friction law and a quasi-dynamic algorithm so as to explore the influence of fault geometry on SSEs characteris-tics. The results show that the geometric factor does have great influence on the spatio-temporal evolution of SSEs. The width of the SSEs zone plays a key role in the simulation of SSEs. And the areas with gentler terrain lead to larger and faster events. The results are helpful to further understand the genesis of SSEs and the influence of fault geometry on the evolution of SSEs. |
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