首页> 外文期刊>Nature >Sensitivity of earthquake cycles on the San Andreas fault to small changes in regional compression
【24h】

Sensitivity of earthquake cycles on the San Andreas fault to small changes in regional compression

机译:San Andreas断层的地震周期对区域压缩的微小变化的敏感性

获取原文
获取原文并翻译 | 示例
           

摘要

The current pattern of slip within the San Andreas fault system in the San Francisco Bay area is distinctly different from the long-term slip pattern inferred from the geological record. This difference is not surprising because geological data record the accumulated displacements over many earthquake cycles, whereas geodetic data reveal the present-day slip pattern. It is not known, however, what mechanism triggers the change from the 'inter-seismic' slip pattern (when the San Andreas fault is locked) to the 'co-seismic' slip pattern (when the San Andreas fault ruptures in earthquake slip). Here we use numerical simulations of the entire seismic cycle on this complex fault system to show that the San Andreas fault may be in a critical state and sensitive to small perturbations in regional compression. In particular, we find that small increases in regional compression may lock the San Andreas fault, whereas small decreases in regional compression may release the locked segment and so permit co-seismic slip. This sensitivity suggests that cyclic changes in the regional stress field resulting from plate convergence and thrust faulting in the Coast Ranges could trigger major earthquakes on the San Andreas fault.
机译:旧金山湾地区圣安德烈亚斯断层系统中当前的滑移模式与地质记录推断出的长期滑移模式有明显不同。这种差异不足为奇,因为地质数据记录了许多地震周期内的累积位移,而大地测量数据揭示了当今的滑动模式。但是,尚不知道是什么机制触发了从“地震间”滑动模式(当圣安地列斯断层被锁定时)到“同震”滑动模式(当地震中的圣安德里亚斯断层破裂时)的变化。 。在这里,我们使用这个复杂断层系统上整个地震周期的数值模拟来表明,圣安德烈亚斯断层可能处于临界状态,并且对区域压缩中的小扰动敏感。特别是,我们发现区域压缩的小幅增加可能会锁定圣安德烈亚斯断层,而区域压缩的小幅下降可能会释放锁定段,从而允许同震滑动。这种敏感性表明,由板块的收敛和海岸山脉的逆冲断层引起的区域应力场的周期性变化可能会触发圣安德烈亚斯断层的大地震。

著录项

  • 来源
    《Nature》 |1997年第6638期|p.158-161|共4页
  • 作者

    Chi-yuen Wang; Yongen Cai;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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