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 |
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Authors: | Yang Xu Zhong-liang Wu Chang-sheng Jiang Yan-xiang Yu and Jian-si Yang |
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Institution: | (1) Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China;(2) College of Earth Science, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China |
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Abstract: | Most of the present earthquake early warning systems are based on broadband or strong motion recordings. However, 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 τ
c
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 convolved
with the instrument response of short-period seismographs in northern China to simulate short-period seismograms. Parameters
τ
c
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 τ
c
estimation.
Contribution No. 08FE3003, Institute of Geophysics, China Earthquake Administration. |
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Keywords: | earthquake early warning system τ c measurement Pd measurement short-period recording |
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