• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Controls on Earthquake Rupture and Triggering Mechanisms in Subduction Zones
【24h】

Controls on Earthquake Rupture and Triggering Mechanisms in Subduction Zones

机译：对俯冲带地震破裂和触发机制的控制

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This thesis investigates earthquake rupture and triggering in subduction zones using earthquake observations, statistical and physical modeling. Comparison of rupture characteristics of M >=7.5 earthquakes with fore-arc structure suggests that frictional heterogeneities (asperities) primarily control the extent of large earthquakes. To identify stress accumulation on the megathrust that could cause an asperity to rupture, this thesis develops a new method to detect space-time variations in stressing rate from earthquake catalogs, based on observations that strain transients due to aseismic processes such as fluid flow or slow slip trigger seismicity, often as swarms. These swarms are modeled with two approaches for investigating driving mechanisms in catalogs: the stochastic Epidemic-Type Aftershock Sequence model (Ogata, 1988) and the rate-state friction model (Dieterich, 1994). These approaches are combined into a model accounting for seismicity rate variations due to both aftershocks and aseismic processes, which is implemented in a data assimilation algorithm to detect transients in earthquake catalogs. The technique is evaluated with a synthetic test and applied to the Salton Trough in southern California and the Hokkaido corner in northeastern Japan. The algorithm successfully identifies aseismic transients in these multi-decade catalogs and may ultimately be useful for mapping spatial variations in frictional conditions on the megathrust.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号