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

摘要/Abstract

摘要： 基于中国区域GPS反演TEC、 GIM TEC、川滇垂测、张衡一号卫星探测等离子体参量数据, 着重分析了2021年5月21日—22日连续发生的云南漾濞6.4级和青海玛多7.4级地震前后的电离层异常现象, 研究认为这两次地震前电离层异常信号具有出现时间早, 扰动区域偏南, 存在正负异常均有的时空发展特性。多参量异常对比分析显示其同步性较差, 3种手段同步的信号较少, 加上空间弱磁扰动对孕震区电离层造成的临震异常增强效应, 导致空间电离层异常信度降低, 也导致预测区域有较大偏差。综合考虑空间弱磁扰影响及磁共轭区地震的电离层响应, 如何有效在中国周边地震活跃的情况下提高本地地震的监测预测能力是未来重点考虑的问题。

关键词: 云南漾濞6.4级地震, 青海玛多7.4级地震, 地震电离层扰动, GPS TEC, 张衡一号卫星

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

中图分类号:

P315.7

张学民, 刘静, 周煜林, 杜晓辉. 2021年云南漾濞M_S6.4地震和青海玛多M_S7.4地震前后的电离层扰动[J]. 地震, 2022, 42(3): 1-20.

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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