Comparison between earthquake magnitudes determined by China seismograph network and US seismograph networks (I): Body wave magnitude |
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| Authors: | Liu Rui-feng Chen Yun-tai Peter Bormann Ren Xiao Hou Jian-min Zou Li-ye and Yang Hui |
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| Institution: | (1) Institute of Geophysics, China Earthquake Administration, 100081 Beijing, China;(2) GeoForschungsZentrum, D-14478 Potsdam, Germany |
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| Abstract: | By using orthogonal regression method, a systematic comparison is made between body wave magnitudes determined by Institute
of Geophysics of China Earthquake Administration (IGCEA) and National Earthquake Information Center of US Geological Survey
(USGS/NEIC) on the basis of observation data from China and US seismograph networks between 1983 and 2004. The result of orthogonal
regression shows no systematic error between body wave magnitude m
b determined by IGCEA and m
b (NEIC). Provided that m
b (NEIC) is taken as the benchmark, body wave magnitude determined by IGCEA is greater by 0.2–0.1 than the magnitude determined
by NEIC for M=3.5–4.5 earthquakes; for M=5.0–5.5 earthquakes, there is no difference; and for M≥6.0 earthquakes, it is smaller by no more than 0.2. This is consistent with the result of comparison by IDC (International
Data Center).
Foundation item: Project "Seismic Data Share" from China Ministry of Science and Technology.
Contribution No. 05FE3024, Institute of Geophysics, China Earthquake Administration. |
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| Keywords: | earthquake magnitude surface wave body wave |
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