Epicenter and magnitude of large earthquake determined from high-rate GPS observations: A case study of the 2008 M8.0 Wenchuan earthquake
Epicenter and magnitude of large earthquake determined from high-rate GPS observations: A case study of the 2008 M8.0 Wenchuan earthquake
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DOI：
10.1007/s11430-013-4803-2
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发表时间：
2014-04
期刊：
影响因子：
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通讯作者：
R. Fang;C. Shi;Guangxing Wang;Jing-nan Liu
中科院分区：
文献类型：
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作者：
R. Fang;C. Shi;Guangxing Wang;Jing-nan Liu
在地震海啸预警和应急响应中，需要快速准确地确定地震震中和震级。利用高速率的GPS观测，可以很容易地获得精确、高分辨率的地震位移时间序列和地震波形。本文提出了一种利用高速率GPS数据提取的地震波形估计地震震中和震级的新算法。以2008年汶川地震为例，利用1 Hz GPS数据确定了震中和震级。与中国地震局发布的结果相比，震中和震级的估计误差分别约为12公里和0.1震级单位。这表明，高速率GPS可以作为一种独立于地震仪或与地震仪相结合的估算地震震中和震级的新工具。
For earthquake and tsunami early warning and emergency response, the earthquake epicenter and magnitude should be determined rapidly and correctly. Using high-rate GPS observations, we can readily obtain precise and high resolution displacement time series and the seismic waveforms during the earthquake. In this paper, a new algorithm is proposed for estimating the earthquake epicenter and magnitude with the seismic waveforms derived from high-rate GPS data during the earthquake. A case study of the 2008 Wenchuan earthquake is conducted from 1 Hz GPS data and the epicenter and magnitude are determined. Compared with the results issued by the China Seismological Bureau, the estimation error of the epicenter and the magnitude is about 12 km and 0.1 magnitude unit, respectively. It has shown that high-rate GPS could be a new tool feasible for estimating the earthquake epicenter and magnitude, independent of or combined with seismometers.