...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Bulletin of the Seismological Society of America >Recordings of the 2004 Parkfield earthquake on the General Earthquake Observation System array: Implications for earthquake precursors, fault rupture, and coseismic strain changes
【24h】

Recordings of the 2004 Parkfield earthquake on the General Earthquake Observation System array: Implications for earthquake precursors, fault rupture, and coseismic strain changes

机译：在普通地震观测系统阵列上记录的2004年Parkfield地震：对地震前兆，断层破裂和同震应变变化的影响

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

The 2004 Parkfield earthquake generated a unique set of near-field, high-resolution colocated measurements of acceleration, volumetric strain, and velocity at 11 stations in the General Earthquake Observation System (GEOS) array. The recordings indicate no precursory strain or displacement was discernable at sensitivities of 10(-11) strain and 5 x 10(-8) m 25 sec prior to the earthquake at distances of 0.5 to 12 km of fault rupture. Coherent fault-parallel and fault-normal displacement pulses, observed along the fault north of the epicenter, are consistent with model predictions for "fling," directivity, and displacement for right-lateral, strike-slip fault rupture. The fault-parallel and fault-normal pulses imply apparent rupture velocities of 2.86 +/- 0.15 and 3.03 +/- 0.24 km/sec, respectively. Unprecedented high-resolution volumetric-strain recordings on opposite sides of the fault show that dynamic strains radiated from ruptured segments of the fault are more than an order of magnitude larger than final coseismic strain offsets associated with fault slip, suggesting that dynamic radiated strain may have contributed to the triggering of failure on unruptured segments. High-resolution recordings show that coseismic strain offsets occur abruptly over time intervals of less than 10 sec near the time of arrival of the dominant radiated fault-parallel and fault-normal displacements. Subsequent measurements show that the strain offsets continue to increase by as much as 69% in 5 min and 300% in 24 hr over that measured during initial fault slip at depth. Estimates of local material parameters from simultaneous measurements of volumetric strain and acceleration confirm seismic calibration factors previously measurable in situ only at tidal periods.
机译：2004年帕克菲尔德地震在通用地震观测系统（GEOS）阵列中的11个站点上产生了一组独特的近场，高分辨率共定位的加速度，体积应变和速度测量值。记录表明在地震发生前0.5秒至12公里的断层破裂距离处，在地震前25秒的10（-11）应变和5 x 10（-8）m的灵敏度下，没有可识别的前兆应变或位移。沿震中北侧断层观测到的相干断层平行和断层法向位移脉冲与模型预测有关“滑动”，方向性和右旋走滑断层破裂的位移。平行断层和正常断层脉冲分别意味着表观破裂速度为2.86 +/- 0.15和3.03 +/- 0.24 km / sec。断层相对两侧的前所未有的高分辨率体积应变记录表明，断层破裂段辐射的动态应变比与断层滑动相关的最终同震应变偏移大一个数量级，这表明动态辐射应变可能具有导致触发未中断网段的故障。高分辨率记录显示，在主要辐射断层平行位移和断层法向位移到达时间不到10秒的时间内，同震应变偏移突然发生。随后的测量结果表明，应变偏移在5分钟内继续增加多达69％，而在24小时内则增加了300％，这是在初始深度断层滑移过程中测得的。通过同时测量体积应变和加速度来估计局部材料参数，可以确认以前仅在潮汐时期才可现场测量的地震校准因子。

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