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EARTHQUAKE ›› 2024, Vol. 44 ›› Issue (2): 120-134.doi: 10.12196/j.issn.1000-3274.2024.02.008

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Retrospective Study on the Forecasting of the Three MS≥5.0 Earthquakes Since 2019 in North China Based on PI Method

SONG Cheng1, ZHANG Yong-xian2, XIA Cai-yun3, BI Jin-meng1, ZHANG Xiao-tao4, WU Yong-jia4, XU Xiao-yuan1   

  1. 1. Tianjin Earthquake Agency, Tianjin 300201, China;
    2. Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China;
    3. Liaoning Earthquake Agency, Shenyang 110031, China;
    4. China Earthquake Networks Center, Beijing 100045, China
  • Received:2023-12-15 Revised:2024-03-13 Online:2024-04-30 Published:2024-04-28

Abstract: In this paper, the local area of North China (32°N~42°N, 114°E~122°E) was chosen as studied region. Regarding the 2023 Shandong Pingyuan MS5.5 earthquake, 2021 Dafeng Sea area MS5.0 earthquake and 2020 Hebei Guye MS5.1 earthquake as the target earthquakes, the Pattern Informatics (PI) method was applied to the retrospective research on the forecasting seismic activity risk of the three earthquakes. With parameters of forecasting window length 5 years and grid size 0.5°×0.5°/1.0°×1.0°, the period from 2019 to 2027 of successive hotspot forecasting window images sliding year by year were obtained. The results show that PI hotspot effect with the grid size 1.0°×1.0 ° is better than 0.5°×0.5°. And it has a good indication effect on the location of Pingyuan and Dafeng sea area earthquakes. When the time window length and the absolute value of the normalization threshold increasing, only a few windows have effective hotspots for the Guye earthquake. But no parameter model that can simultaneously cover the epicenter grid of the three earthquakes has been found. There is a risk of MS≥5.0 earthquake in the Bohai Rim region of the Tan-Lu fault zone in the following 3~4 years, which the PI hotspots under different parameter models indicating. The results of this paper can provide certain reference significance about seismic hazard analysis of MS≥5.0 earthquake for local area of North China.

Key words: The 2023 Pingyuan MS5.5 earthquake, The 2021 Dafeng sea area MS5.0 earthquake, The 2020 Guye MS5.1 earthquake, Pattern informatics method, Hotspot migration

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