• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pure and Applied Geophysics >Optimized Seismic Threshold Monitoring – Part 1: Regional Processing
【24h】

Optimized Seismic Threshold Monitoring – Part 1: Regional Processing

机译：优化的地震阈值监控–第1部分：区域处理

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

— Continuous seismic threshold monitoring is a technique that has been developed over the past several years to assess the upper magnitude limit of possible seismic events that might have occurred in a geographical target area. The method provides continuous time monitoring at a given confidence level, and can be applied in a site-specific, regional or global context.¶In this paper (Part 1) and a companion paper (Part 2) we address the problem of optimizing the site-specific approach in order to achieve the highest possible automatic monitoring capability of particularly interesting areas. The present paper addresses the application of the method to cases where a regional monitoring network is available. We have in particular analyzed events from the region around the Novaya Zemlya nuclear test site to develop a set of optimized processing parameters for the arrays SPITS, ARCES, FINES, and NORES. From analysis of the calibration events we have derived values for beam-forming steering delays, filter bands, short-term average (STA) lengths, phase travel times (P and S waves), and amplitude-magnitude relationships for each array. By using these parameters for threshold monitoring of the Novaya Zemlya testing area, we obtain a monitoring capability varying between m b 2.0 and 2.5 during normal noise conditions.¶The advantage of using a network, rather than a single station or array, for monitoring purposes becomes particularly evident during intervals with high global seismic activity (aftershock sequences), high seismic noise levels (wind, water waves, ice cracks) or station outages. For the time period November-December 1997, all time intervals with network magnitude thresholds exceeding m b 2.5 were visually analyzed, and we found that all of these threshold peaks could be explained by teleseismic, regional, or local signals from events outside the Novaya Zemlya testing area. We could therefore conclude within the confidence level provided by the method, that no seismic event of magnitude exceeding 2.5 occurred at the Novaya Zemlya test site during this two-month time interval.¶As an example of particular interest in a monitoring context, we apply optimized threshold processing of the SPITS array for a time interval around 16 August 1997 m b 3.5 event in the Kara Sea. We show that this processing enables us to detect a second, smaller event from the same site (m b 2.6), occurring about 4 hours later. This second event was not defined automatically by standard processing.
机译：—连续地震阈值监视是过去几年中开发的一种技术，用于评估地理目标区域中可能发生的地震事件的幅度上限。该方法可以在给定的置信度下提供连续的时间监视，并且可以在特定于站点，区域或全局的环境中应用。¶在本文（第1部分）和随附的论文（第2部分）中，我们解决了优化广告投放时间的问题。特定于站点的方法，以便在特别有趣的区域实现最高的自动监视能力。本文讨论了该方法在区域监控网络可用的情况下的应用。我们特别分析了Novaya Zemlya核试验场周围地区的事件，以开发出一系列针对SPITS，ARCES，FINES和NORES阵列的优化处理参数。通过对校准事件的分析，我们得出了波束形成转向延迟，滤波器频带，短期平均（STA）长度，相位传播时间（P和S波）以及每个阵列的幅度-幅度关系的值。通过使用这些参数对Novaya Zemlya测试区域进行阈值监视，我们获得了在正常噪声条件下mb 2.0和2.5之间变化的监视能力。¶使用网络而不是单个站点或阵列的优势在具有高全球地震活动（余震序列），高地震噪声水平（风，水浪，冰裂缝）或车站停工的时间间隔内，用于监测目的变得尤为明显。对于1997年11月至12月的时间段，对网络大小阈值超过mb 2.5的所有时间间隔进行了可视化分析，我们发现，所有这些阈值峰值都可以由外部事件的远震，区域或本地信号来解释Novaya Zemlya测试区。因此，我们可以在该方法提供的置信度内得出结论，在这两个月的时间间隔内，Novaya Zemlya测试地点没有发生超过2.5级的地震事件.¶在1997年8月16日mb 3.5事件在卡拉海附近对SPITS阵列进行了优化的阈值处理。我们证明了这种处理使我们能够从同一站点（mb 2.6）检测到第二个较小的事件，大约在4小时后发生。第二个事件不是标准处理自动定义的。

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