青藏高原周缘三次强地震伴生的卫星高光谱遥感地球化学异常

doi:10.12196/j.issn.1000-3274.2021.02.010

Abstract

Abstract: Based on the hyperspectral AIRS data, the data of CH₄ gas geochemical anomalies were obtained associated with the Jiuzhaigou M_S7.0 earthquake in August 2017, the Motuo M_S6.3 earthquake in April 2019 and the Yutian M_S6.4 earthquake in June 2020 in three different tectonic units around the Qinghai Tibet Plateau. The results processed with Matlab show that the content of CH₄ column appears high value anomaly about one week and a half months before the three earthquakes, and the anomaly is distributed along the fault zone, in which the anomaly amplitude at the intersection of the fault zone is larger. Due to the differences of tectonic environment, seismogenic type and magnitude, the occurrence time, duration and intensity of CH₄ gas concentration anomaly caused by earthquakes in three tectonic units are different. The anomaly of remote sensing information before and after the three earthquakes corresponds well with the seismicity, which is attributed to the underground gas escaping along the fractures fromed by the action of seismogenic stress field. The results are of great significance to the application of satellite high spectral resolution remote sensing technology in earthquake monitoring and short-term and impending prediction of large earthquakes.

Key words: Earthquake, Gas geochemical anomaly, Satellite hyperspectrum, Methane, Edge of Qinghai-Tibet Plateau

CLC Number:

P315.7

JIANG Li, CUI Yue-ju, DU Jian-guo, DING Zhi-hua, LIU Yong-mei, LIU Yi-nan. Satellite Hyperspectral Remote Sensing Geochemical Anomalies Associated with Three Strong Earthquakes Around the Qinghai-Tibetan Plateau[J]. EARTHQUAKE, 2021, 41(2): 129-144.

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Satellite Hyperspectral Remote Sensing Geochemical Anomalies Associated with Three Strong Earthquakes Around the Qinghai-Tibetan Plateau

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