• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pure and Applied Geophysics >Velocity Change in the Zone of a Moderate Mw 5.0 Earthquake Revealed by Autocorrelations of Ambient Noise and by Event Spectra
【24h】

Velocity Change in the Zone of a Moderate Mw 5.0 Earthquake Revealed by Autocorrelations of Ambient Noise and by Event Spectra

机译：通过环境噪声的自相关和事件谱揭示了适度MW 5.0地震区域的速度变化

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

A moderate Mw 5.0 earthquake occurred near Mogul, Nevada (just west of Reno, Nevada), on 26 April 2008. This mainshock was surrounded by notable foreshock and aftershock sequences. Due to the long foreshock sequence, the area was well instrumented at the time of the mainshock. We investigated the foreshock and aftershock sequences for evidence of velocity changes in the structure immediate to the hypocenter and above it in the area of observed strong ground motion. Using autocorrelations of the time periods with nearly continuous foreshocks and aftershocks, we detected a nearly 1% negative change in velocity on recordings of station MOGL which was approximately over the hypocenter of the mainshock. We also observed from these recordings a shift in the spectral peaks to lower frequency following the mainshock, again indicative of a velocity decrease. Due to the different spatial sampling of the two methods, the effects could not be attributed to the same subsurface volume. However, both results are strong evidence for coseismic velocity changes accompanying an earthquake which is very much smaller than those for which previous velocity changes have been reported. We hypothesize that these changes can be observed for even smaller earthquakes, given a fortuitous placement of observing stations.
机译：2008年4月26日，内华达州Mogul附近发生了适度的MW 5.0地震发生了近期的地震。这个主斯基克被着名的猎犬和余震序列包围。由于长期扫描序列，该区域在主震动时良好的仪器。我们调查了前脚袋和余震序列，以便在观察到的强大地面运动面积上立即到速度变化的速度变化。使用与几乎连续的预填充和余震的时间段的自相关，我们检测到速度的速度近1％的负变化，在车站Mogl的录制上大约过于主轴的低蜂鸣器。我们还从这些录音中观察到频谱峰值在主轴的频率升高到较低的频率，再次指示速度降低。由于两种方法的不同空间采样，效果不能归因于相同的地下体积。然而，这两个结果都是伴随着伴随着速度变化的地震的电影速度变化的强有力证据。考虑到观察站的偶然放置，我们假设可以观察到这些变化甚至更小的地震。

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