...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth, planets and space: EPS >High resolution 3-D velocity structure in the source region of the 2000 Western Tottori Earthquake in southwestern Honshu, Japan using very dense aftershock observations
【24h】

High resolution 3-D velocity structure in the source region of the 2000 Western Tottori Earthquake in southwestern Honshu, Japan using very dense aftershock observations

机译：利用非常密集的余震观测结果，日本本州西南部2000年鸟取西部地震震源区的高分辨率3-D速度结构

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

摘要

We carried out high density aftershock observations a week after the 2000 Western Tottori Earthquake for 40 days. We deployed 72 seismic stations in and around the aftershock area. The average spacing of the stations in the aftershock area was 4-5 km. We determined accurate hypocenters and focal mechanisms for ~1,000 aftershocks and obtained a high resolution 3-D velocity structure in the source region. High P and S wave velocity anomalies (> 4%) near the southeasternmost aftershock area at 2 km depth correlated with Jurassic to Late Cretaceous plutonic and high pressure metamorphic rocks. The depth distribution of the P and S wave velocities along the mainshock fault showed that high velocity anomalies were located at the shallow southeastern edge and the deeper central part of the aftershock area. The ratio between P and S wave velocities in the high velocity anomalies was a little higher (~1.75) than the average value (~1.70) in the upper crust. These results indicate that the high velocity anomalies could correspond to the plutonic or metamorphic rocks. The distributions of the high velocity anomalies and large slips of the mainshock were complementary. These suggest that the high velocity anomalies could be stronger than the surrounding materials and might behave as barriers to the mainshock rupture.
机译：2000年鸟取县西部地震发生40天后的一周，我们进行了高密度余震观测。我们在余震地区及其周围地区部署了72个地震台站。余震区的平均站距为4-5 km。我们确定了约1,000次余震的准确震源和震源机制，并在源区获得了高分辨率的3-D速度结构。在最东南的余震区2 km深度附近，高P和S波速度异常（> 4％）与侏罗纪至晚白垩世岩浆岩和高压变质岩有关。沿主震断层的Ｐ波和Ｓ波速度的深度分布表明，高速异常出现在东南浅水区和余震区较深的中部。高速异常中的P波和S波速度之比（〜1.75）比上地壳的平均值（〜1.70）稍高。这些结果表明，高速异常可能对应于深成岩或变质岩。高速异常和主震的大滑动分布是互补的。这些表明，高速异常可能比周围的物质更强，并且可能充当主震破裂的屏障。

著录项

相似文献

  • 外文文献
  • 中文文献
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