Change Characteristics of Wave Velocity Ratio in Tangshan Area
Abstract We select the seismic phase reports of Tangshan region by Hebei digital seismic network from 2008 to 2018 and calculate the wave velocity ratio by multi station-multi earthquake method and single station-multi earthquake method. We then analyze the characteristics of wave velocity ratio change combined with seismic activity. The results show that using the velocity ratio by multi station-multi earthquake method is more stable, but the results by the single station-multi earthquake method show more detail, and low value anomaly appears in varying degrees before ML≥4.5 earthquakes in the Tangshan region. The locations of abnormal stations correspond to earthquakes, to some extent.
Key words :
Tangshan
earthquake
wave velocity ratio
station
Cite this article:
WANG Yaru,SONG Zhao,LIU Xiaodan et al. Change Characteristics of Wave Velocity Ratio in Tangshan Area[J]. jgg, 2019, 39(7): 686-690.
WANG Yaru,SONG Zhao,LIU Xiaodan et al. Change Characteristics of Wave Velocity Ratio in Tangshan Area[J]. jgg, 2019, 39(7): 686-690.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2019/V39/I7/686
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