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Ionospheric and atmospheric perturbations due to two major earthquakes (M >7.0)
Journal of Earth System Science ( IF 1.9 ) Pub Date : 2021-07-30 , DOI: 10.1007/s12040-021-01650-x
Sanjay Kumar 1 , A K Singh 1 , R P Singh 1 , Prashant Kumar Singh 2 , Rohtash Kumar 2
Affiliation  

The perturbation produced in the atmosphere/ionosphere associated with earthquake precursors during seismic activity of two major earthquakes which occurred on (1) 24 June 2019 in Indonesia (M = 7.3) and (2) on 19 August 2018 at Ndoi, Fiji (M = 8.2), are studied. Based on statistical analysis of total electron content (TEC) data, the presence of ionospheric perturbations 5 days before and after the main shock are found, which depends on the distance as well as direction of observation point from the epicentre. In general, ionospheric perturbations after the EQ at all the stations are found larger than that before the EQ. Probable mechanisms behind these perturbations associated with EQ are also being discussed. The ionospheric perturbations are observed at stations which are at larger distances from the epicentre, but not observed over other stations in different directions which are comparatively closer to the epicentre. These results suggest that seismic induced ionospheric anomaly is not isotropic in nature. Ozone data from three satellites: AIRS, OMI, and TOMS-like and MERRA-2 model are also analyzed 5 days before the EQ day and compared to the monthly average level. A strong link between anomalous variation in ionospheric TEC and atmospheric ozone data prior to both the EQs is noticed.



中文翻译:

两次大地震(M >7.0)引起的电离层和大气扰动

2019 年 6 月 24 日在印度尼西亚(M = 7.3)和(2)2018 年 8 月 19 日在斐济恩多伊(M = 8.2), 进行了研究。基于对总电子含量 (TEC) 数据的统计分析,电离层扰动的存在5 天发现主震前后,这取决于观测点距震中的距离和方向。总的来说,所有台站均衡后的电离层扰动都大于均衡前的电离层扰动。与情商相关的这些扰动背后的可能机制也在讨论中。电离层扰动在距震中较远的台站上观测到,但在距震中较近的不同方向的其他台站上没有观测到。这些结果表明地震引起的电离层异常本质上不是各向同性的。来自三颗卫星的臭氧数据:AIRS、OMI 和 TOMS-like 和 MERRA-2 模型也在 EQ 日前 5 天进行分析,并与月平均水平进行比较。

更新日期:2021-07-30
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