ESTIMATION OF EARTHQUAKE GROUND MOTION IN MEXICO CITY AND DELHI, TWO MEGA CITIES
ESTIMATION OF EARTHQUAKE GROUND MOTION IN MEXICO CITY AND DELHI, TWO MEGA CITIES
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墨西哥城和德里两个大城市的地震地面运动估计
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
S. K. Singh
中科院分区：
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作者：
S. K. Singh
墨西哥城和德里受到大/大板块边界的强烈震动，距离超过250公里的逆冲地震，以及中/大的地方和区域地震。自1985年墨西哥城发生米霍坎地震（WM = 8）以来，我们对墨西哥谷未来地震的地面运动估计能力有了很大提高。自1992年以来，地震警报系统一直在运行，它提供了约60秒的警报时间，以城市发生强烈的地面运动。根据城市参考站的实时记录和数百个站点的已知传递函数，可以在S波到达后约5分钟内获得震动图。德里的地震仪器很少。因此，我们对德里当地和区域地震活动性和地震构造的了解仍然很差，对地面运动和场地效应的估计存在很大的不确定性。我们通过对2007年11月25日记录良好的德里地震的分析来说明其中的一些不足之处（W M =
Mexico City and Delhi are subject to strong shaking from large/great plate-boundary, thrust earthquakes located at distances exceeding ~250 km, and from moderate/large local and regional earthquakes. Since the 1985 Michoacan earthquake ( W M = 8), which caused severe damage and loss of lives in Mexico City, our capability of ground-motion estimation in the Valley of Mexico for future earthquakes has greatly improved. A seismic alert system has been in operation since 1992, which provides ~60 s of alert time to the city before the occurrence of intense ground motion. Based on realtime recording at a reference station in the city and known transfer functions of hundreds of sites, shake maps are available within ~5 min of the arrival of S waves. Seismic instrumentation in Delhi is sparse. Our knowledge of local and regional seismicity and seismotectonics for Delhi, therefore, remains poor and estimation of ground motions and site effects is subject to large uncertainty. We illustrate some of these deficiencies from an analysis of the well-recorded Delhi earthquake of November 25, 2007 ( W M =