...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pure and Applied Geophysics >Spatiotemporal Variations of Stress and Strain Parameters in the San Jacinto Fault Zone
【24h】

Spatiotemporal Variations of Stress and Strain Parameters in the San Jacinto Fault Zone

机译：SAN Jacinto断层区中应力和应变参数的时空变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We analyze the background stress field around the San Jacinto fault zone (SJFZ) in Southern California with a refined inversion methodology using declustered focal mechanisms of background seismicity. Stress inversions applied to the entire fault zone, and three focus areas with high level of seismicity, provide three-dimensional distributions of the maximum horizontal compression direction (S-Hmax), principal stress plunges, and stress ratio R=(sigma 1-sigma 2)/(sigma 1-sigma 3). The results are compared with coseismic strain parameters derived from direct summation of earthquake potencies and b values of frequency-size event statistics. The main stress regime of the SJFZ is strike-slip, although the northwest portion near Crafton Hills displays significant transtension. The S-Hmax orientation rotates clockwise with increasing depth, with the largest rotation (23 degrees) observed near Crafton Hills. The principal stress plunges have large rotations below similar to 9km, near the depth section with highest seismicity rates and inferred brittle-ductile transition zone. The rotations produce significant deviations from Andersonian strike-slip faulting, likely generating the observed increased dip-slip faulting of relatively deep small events. The stress ratio parameters and b value results are consistent with increasing number of dip-slip faulting below similar to 9km. The derived coseismic strain parameters are in good agreement with the stress inversion results. No large-scale stress rotations are observed across the time of the 2010 M-w 7.2 El Mayor-Cucapah earthquake. The stress ratio near the Trifurcation area of the SJFZ changes after the El Mayor-Cucapah earthquake toward transpression, but this may have been produced by local M>5.4 event or aseismic slip.
机译：我们在南加利福尼亚州San Jacinto断层区（SJFZ）周围的背景应力场，采用了通过后果的背景地震性的转换局灶性机制进行了精细的反演方法。施加到整个断层区域的应力逆，以及具有高水平地震性的三个焦点区域，提供最大水平压缩方向（S-HMAX），主应力升压和应力比R =（Sigma 1-Sigma的三维分布2）/（Sigma 1-Sigma 3）。将结果与来自频率大小统计的地震级和B值的直接总结导出的电影症应变参数进行了比较。 SJFZ的主要压力制度是滑动，尽管Fructon Hills附近的西北部部分显示出显着的谐波。 S-HMAX取向顺时针旋转，深度越来越深，傅立布山附近观察到最大的旋转（23度）。主应力普隆在低于9km的大型旋转，靠近具有最高地震性速率和推断脆性延展转换区域的深度部分。旋转产生与Andersonian滑行断层的显着偏差，可能产生观察到的相对深的小事件的增加的倾倍故障。应力比参数和B值结果与越来越多的倾倍故障相似的倾斜断层相似，与9km相似一致。衍生的CoSeismic应变参数与压力反转结果良好。在2010 M-W 7.2 El Mayor-Cucapah地震的时间内没有观察到大规模的应力旋转。 SJFZ靠近SJFZ的透视面积附近的应力比在El Mayor-Cucapah地震到变形之后改变，但这可能是由局部M> 5.4事件或抗空血的产生。

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