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Application of geomagnetic load-unload response ratio method in north-south seismic belt
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|Authors:||Dai Miao; Feng Zhisheng; Liu Jian; Li Deqian; Wei Guichun; Shen Xuelin|
|Author Affiliations:||Primary: |
China Earthquake Administration, Institute of Seismology, Wuhan, China
Earthquake Administration of Hubei Province, China
Earthquake Administration of Jiangsu Province, China
|Volume Title:||Dizhi Keji Qingbao Geological Science and Technology Information|
|Source:||Dizhi Keji Qingbao = Geological Science and Technology Information, 36(4), p.222-227. Publisher: China University of Geosciences, Wuhan, China. ISSN: 1000-7849|
|Note:||In Chinese with English summary. 24 refs.; illus., incl. 1 table, sketch map|
|Summary:||Electromagnetic properties change indielectric conductivity due to stress changes before the earthquake may cause the corresponding changes in phase and amplitude of regional vertical magnetic field diurnal variation curve, and hence geomagnetic load-unload response ratios an effective method for identification of abnormal amplitude. This paper calculates geomagnetic load-unload response ratios before 18 significant earthquakes in the north-south seismic belt, analyzes the geomagnetic load-unload response ration spatial distribution characteristics and the formation mechanism before earthquakes. The results indicate that: (1) In the exclusion of space weather, surrounding environment instrument and monitoring system and other factors, geomagnetic load-unload response ratio abnormal appear before some strong earthquakes, accounting for 44.4%. (2) Geomagnetic load-unload response ratio threshold is affected by latitude, and in the condition of the same longitude, the greater the latitude, the lower the threshold. After repeated debugging and contrast, the calculation results show that the response ratio threshold of the north-south seismic belt in the northern section is 3, and that of south and southwest regions is 3.1. (3) In general, abnormal within 6 months after the occurrence of moderate earthquakes, the bigger the number of abnormal stations, the greater the magnitude of strong earthquakes. The epicenter is more likely to be located near the threshold line.|
|Subjects:||Applications; Earthquake prediction; Earthquakes; Magnetic field; Magnetometers; Observations; Seismic networks; Seismic zoning; Seismology; Asia; China; Far East|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute.|
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