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首页> 外文期刊>Seismological Research Letters >The April 18, 2008 Illinois Earthquake: An ANSS Monitoring Success
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The April 18, 2008 Illinois Earthquake: An ANSS Monitoring Success

机译:2008年4月18日伊利诺伊州地震:ANSS监测成功

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The largest-magnitude earthquake in the past 20 years struck near Mt. Carmel in southeastern Illinois on Friday morning, 18 April 2008 at 09:36:59 UTC (04:37 CDT). The Mw 5.2 earthquake was felt over an area that spanned Chicago and Atlanta, with about 40,000 reports submitted to the U.S. Geological Survey (USGS) "Did You Feel It?" system. There were at least six felt aftershocks greater than magnitude 3 and 20 aftershocks with magnitudes greater than 2 located by regional and national seismic networks. Portable instrumentation was deployed by researchers of the University of Memphis and Indiana University (the first portable station was installed at about 23:00 UTC on 18 April). The portable seismographs were deployed both to capture near-source, high-frequency ground motions for significant aftershocks and to better understand structure along the active fault. The previous similar-size earthquake within the Wabash Valley seismic zone (WVSZ) of southeastern Illinois and southwestern Indiana was a magnitude 5.0 in June 1987. The seismicity associated with the WVSZ is thought to occur in a complex horst and graben system of Precambrian igneous and metamorphic units at depths between 12 and 20 km. Paleoliquefaction evidence suggests several major shaking events have occurred within the past 12,000 years (Munson et al. 1997).
机译:过去20年中最大的地震发生在Mt. 2008年4月18日星期五上午UTC(CDT 04:37)在伊利诺伊州东南部的卡梅尔(Carmel)。在横跨芝加哥和亚特兰大的整个地区都感觉到5.2级地震,向美国地质调查局(USGS)提交了约40,000份报告“您感觉到了吗?”系统。至少有6个大于3级的毡状余震,以及20个大于2级的区域和国家地震网络余震。便携式仪器是由孟菲斯大学和印第安纳大学的研究人员部署的(第一个便携式站安装于4月18日世界标准时间23:00左右)。便携式地震仪的部署既可以捕获近源,高频地震动以产生重大余震,也可以更好地了解沿活动断层的构造。 1987年6月,伊利诺斯州东南部和印第安纳州西南部的瓦巴什谷地震带(WVSZ)内发生了类似规模的地震。1987年6月,与WVSZ相关的地震活动发生在前寒武纪火成岩和火成岩的复杂地幔系统中。 12至20 km深度的变质单元。古液化证据表明在过去的12,000年中发生了几次重大的震动事件(Munson等,1997)。

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