2021年云南漾濞MS6.4地震和青海玛多MS7.4地震前后的电离层扰动

doi:10.12196/j.issn.1000-3274.2022.03.001

Abstract

Abstract: Based on the multi data of TEC inversed from GPS observations in China, GIM (Global Ionsopheric Mapping) TEC, the vertical ionosond in Sichuan and Yunnan provinces, plasma parameters from Zhangheng-1 satellite, the ionospheric perturbations were analyzed around Yangbi M_S6.4 and Maduo M_S7.4 earthquake on 21—22 May 2021, in Yunnan and Qinghai provinces respectively. The ionospheric disturbances before these two strong earthquakes showed the characteristics of earlier occurring in time, at southern region of Yunnan province in space, with positive and negative anomalies in shape. The comparative analysis based on multi observations presents that they had poor synchronization, with few 3 technologies observing the same abnormal signals at the same day. In addition, the enhancement of imminent ionospheric perturbations was possibly overlapped by the effects of weak magnetic disturbances from outer space. All these reduce the reliability of ionospheric precursors, and cause the significant deviation for predicted earthquake location. Comprehensively considering the weak space magnetic disturbances and the high seismic activity at magnetic conjugate regions, how to improve the monitoring and predicting ability for local earthquakes is a key problem under the condition of high seismic activity around China and its surrounding regions.

Key words: 2021 Yangbi M_S6.4 earthquake in Yunnan Province, 2021 Maduo M_S7.4 earthquake in Qinghai Province, Seismo-ionospheric perturbation, GPS TEC, ZH-1 satellite

CLC Number:

P315.7

ZHANG Xue-min, LIU Jing, ZHOU Yu-lin, DU Xiao-hui. The Ionospheric Perturbations Around Yunnan Yangbi M_S6.4 and Qinghai Maduo M_S7.4 Earthquakes in 2021[J]. EARTHQUAKE, 2022, 42(3): 1-20.

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The Ionospheric Perturbations Around Yunnan Yangbi M_S6.4 and Qinghai Maduo M_S7.4 Earthquakes in 2021

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[1]	GUO Yu-fan, DU Xiao-hui, DONG Lei, TANG Lan-rong, ZHAO Ai-ping, WANG Gan-jiao. Seismo-Ionospheric Effects Prior to the 2021 Maduo, Qinghai M_S7.4 Earthquake Based on the China Seismo-Electromagnetic Satellite [J]. EARTHQUAKE, 2023, 43(2): 85-102.
[2]	ZHANG Xue-min, LIU Jing, XIONG Pan, ZHOU Yu-lin. The Seismo-ionospheric Disturbances before the 2020 Yutian M_S6.4 Earthquake [J]. EARTHQUAKE, 2021, 41(2): 145-157.
[3]	HE Jian-hui,ZHANG Xue-min,LIN Jian,WANG Min,SHEN Xu-hui. Coseismic Ionosphere Disturbances of the 2008 Wenchuan Earthquake [J]. EARTHQUAKE, 2017, 37(2): 126-134.
[4]	YAO Lu, SHEN Xu-hui, ZHANG Xue-min. Analysis of lonospheric A nomalies Preceding the 2010 Y ushu M_s7.1 Earthquake [J]. EARTHQUAKE, 2014, 34(3): 74-85.

The Ionospheric Perturbations Around Yunnan Yangbi MS6.4 and Qinghai Maduo MS7.4 Earthquakes in 2021

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The Ionospheric Perturbations Around Yunnan Yangbi M_S6.4 and Qinghai Maduo M_S7.4 Earthquakes in 2021