利用远震波计算英国宽带地震台的快速矩震级 (Mwp)

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-08-19 DOI:10.1007/s00024-024-03557-2
Timur Tezel, Gillian R. Foulger, Jon G. Gluyas
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引用次数: 0

摘要

考虑到位于地震活跃地区的国家,快速、正确地确定地震震级对于开始模拟评估海啸发生的可能性、为海啸易发国家提供早期预警和快速响应至关重要。虽然英国的海啸危害程度不高,但英国地震网络可以估算出全球范围内将发生的大地震的震级。这项研究旨在测试英国地震网络宽带地震台利用远震波计算 P 波矩级(Mwp)的能力。计算 Mwp 的标准方法是使用在不同震中距离记录的地震波的 P 波部分。我们选择了 25 个震级大于 6.5Mw、震中距在 17 至 90 度之间的地震事件。主要问题是选择地震波的 P 波部分,并使用试验 P 波速度来估算 Mwp。我们利用一个理论公式简化了地震波 P 波部分的选择,该公式与震中距、P 波到达时间和视 P 波速度一起计算 S 波到达时间。结果显示,哈佛中心矩张量(CMT-Mw)与 Mwp 之间存在差异,在大多数事件中约为± 0.1 个震级单位,在某些事件中为± 0.2 个震级单位。这些结果证明 Mwp 技术可以应用于英国宽带地震网络宽带地震台,并鼓励在世界任何地方发生破坏性地震后立即使用该技术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Rapid Moment Magnitude (Mwp) Calculation for UK Broadband Seismic Stations Using Teleseismic Waves

Determining the magnitude of an earthquake rapidly and correctly is essential to starting simulations to evaluate the potential for tsunami generation and early warning for tsunami-prone countries and rapid response, considering countries that lie in seismically active regions. Although the UK does not have a high degree of tsunami hazard, the UK seismic network can estimate the moment magnitude for large earthquakes which will occur around the globe. This study aimed to test the UK Seismological Network Broadband Seismic Stations to calculate the P-wave moment magnitude (Mwp) using teleseismic waves. The standard way to calculate the Mwp is using the P-wave portion of a seismic wave recorded at different epicentral distances. We selected twenty-five seismic events with a magnitude greater than 6.5Mw and epicentral distances between 17 and 90 degrees. The main issue is selecting the P-wave portion of a seismic wave and using a trial P-wave velocity to estimate the Mwp. We simplified the selection of a P-wave portion of seismic waves using a theoretical formula that works with epicentral distance, P-wave arrival time and an apparent P-wave velocity, which calculates the S-wave arrival time. The results show the variation between the Harvard centroid moment tensor (CMT—Mw) and Mwp, which is about ± 0.1 magnitude units in most events and ± 0.2 for some events. These results prove the Mwp technique can be applied to the UK broadband seismic network broadband seismic stations and encourage the use of it immediately following a destructive earthquake anywhere in the world.

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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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