...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pure and Applied Geophysics >Laboratory Generated M -6 Earthquakes
【24h】

Laboratory Generated M -6 Earthquakes

机译：实验室引起的M -6地震

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 consider whether mm-scale earthquake-like seismic events generated in laboratory experiments are consistent with our understanding of the physics of larger earthquakes. This work focuses on a population of 48 very small shocks that are foreshocks and aftershocks of stick-slip events occurring on a 2.0 m by 0.4 m simulated strike-slip fault cut through a large granite sample. Unlike the larger stick-slip events that rupture the entirety of the simulated fault, the small foreshocks and aftershocks are contained events whose properties are controlled by the rigidity of the surrounding granite blocks rather than characteristics of the experimental apparatus. The large size of the experimental apparatus, high fidelity sensors, rigorous treatment of wave propagation effects, and in situ system calibration separates this study from traditional acoustic emission analyses and allows these sources to be studied with as much rigor as larger natural earthquakes. The tiny events have short (3-6 μs) rise times and are well modeled by simple double couple focal mechanisms that are consistent with left-lateral slip occurring on a mm-scale patch of the precut fault surface. The repeatability of the experiments indicates that they are the result of frictional processes on the simulated fault surface rather than grain crushing or fracture of fresh rock. Our waveform analysis shows no significant differences (other than size) between the M -7 to M -5.5 earthquakes reported here and larger natural earthquakes. Their source characteristics such as stress drop (1-10 MPa) appear to be entirely consistent with earthquake scaling laws derived for larger earthquakes.
机译：我们考虑实验室实验中产生的毫米级类似地震的地震事件是否与我们对大地震的物理学认识相一致。这项工作着眼于48个非常小的冲击，这些冲击是在穿过大型花岗岩样品的2.0 m x 0.4 m模拟走滑断层上发生的粘滑事件的前兆和余震。与较大的粘滑事件会破坏整个模拟断层不同，较小的前震和余震包含的事件的性质由周围花岗岩块的刚度控制，而不是由实验装置的特征控制。实验装置的大尺寸，高保真传感器，对波传播效应的严格处理以及原位系统校准将这项研究与传统的声发射分析区分开来，并且可以对这些震源进行更严格的研究，而与更大的自然地震一样。微小事件的上升时间短（3-6μs），并通过简单的双耦合焦点机制很好地建模，该机制与在预切断层表面的毫米尺度斑块上发生的左侧滑动一致。实验的可重复性表明，它们是模拟断层表面摩擦过程的结果，而不是颗粒破碎或新鲜岩石破裂。我们的波形分析显示，此处报告的M -7至M -5.5地震与较大的自然地震之间没有显着差异（大小除外）。它们的应力源特征（如应力降（1-10 MPa））似乎与大地震得出的地震定标律完全一致。

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