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ISSN 2096-7780 CN 10-1665/P

Wang Jian, Yang Yayun, Ma Wei. Monitoring variation of crustal media in Wulong area of Chongqing Municipality by using repeating earthquakes[J]. Progress in Earthquake Sciences, 2021, (11): 498-504. DOI: 10.3969/j.issn.2096-7780.2021.11.003
Citation: Wang Jian, Yang Yayun, Ma Wei. Monitoring variation of crustal media in Wulong area of Chongqing Municipality by using repeating earthquakes[J]. Progress in Earthquake Sciences, 2021, (11): 498-504. DOI: 10.3969/j.issn.2096-7780.2021.11.003

Monitoring variation of crustal media in Wulong area of Chongqing Municipality by using repeating earthquakes

  • The waveform and observation report data of 107 earthquakes with ML≥1.5 recorded by Chongqing Digital Seismic Network in Wulong area were selected. The waveform cross-correlation technology was used for correlation calculation. 12 groups of repeating earthquakes with waveform correlation coefficient larger than 0.8 and recorded by 3 seismic stations at the same time were identified. The position of repeating earthquakes in Wulong area was normalized by ray tracing method, and the change of P-wave travel-time difference of the selected stations was obtained. The results show that four years before the 2017 Wulong MS5.0 earthquake, there are long-term negative abnormal changes in P-wave travel-time difference recorded by Wulong, Xiannushan and Fuling seismic stations, lasting for 339 days, with a total of 18 negative values. It shows that the crustal medium velocity increases obviously in this period.
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