地震学报（英文版）2008，Vol.21Issue(2)：139-147,9.
Estimating the size of an earthquake using short-period seismograms of the first three seconds: A simulated experiment using the 1999 Chi-Chi earthquake sequence
Estimating the size of an earthquake using short-period seismograms of the first three seconds: A simulated experiment using the 1999 Chi-Chi earthquake sequence
摘要
Abstract
Most of the present earthquake early warning systems are based on broadband or strong motion recordings. How- ever, the short-period instruments are still deployed. It is well-known that short-period recordings have saturation problems for large earthquakes when estimating the size of an earthquake. Thus, it is necessary to make clear the magnitude at which saturation starts to occur for the commonly used τc and Pd measurements, respectively. To investigate the possibility of using short-period seismic recordings for earthquake early warning, we conducted a simulated experiment using the strong motion data of the 1999 Chi-Chi earthquake sequence including its main shock and 31 aftershocks, with magnitude span from 4 to 7.6. The strong motion acceleration recordings were convoived with the instrument response of short-period seismographs in northern China to simulate short-period seismograms. Parameters τc and Pd from the first-three-second seismograms were calculated for the simulated short-period recordings and compared with that obtained by the original strong ground motion recordings. The result showed that to some extent, short-period recordings can be used for threshold earthquake early warning, while the magnitude saturation of Pd estimation can be up to 6.5, better than τc estimation.关键词
earthquake early warning system/ τc measurement/ Pd measurement/ short-period recordingKey words
earthquake early warning system/ τc measurement/ Pd measurement/ short-period recording分类
天文与地球科学引用本文复制引用
XU Yang,WU Zhong-liang,JIANG Chang-sheng,YU Yan-xiang,YANG Jian-si..Estimating the size of an earthquake using short-period seismograms of the first three seconds: A simulated experiment using the 1999 Chi-Chi earthquake sequence[J].地震学报（英文版）,2008,21(2):139-147,9.基金项目
Foundation for Seismological Researches. （）
