2025年1月2日宁夏银川4.8级、4.6级地震热红外异常特征分析

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中图分类号：P315.7；P407 文献标志码：A 文章编号：1000-0844（2025）06—1425—10

DOI：10.20000/j.1000-0844.20250602001

Abstract： Two earthquakes occurred in the urban area of Ningxia on January 2，2O25，causing significant societal impact. To enhance regional seismic monitoring capabilities， based on the black-body brightness temperature（TBB） and outgoing longwave radiation （OLR） data from FY-2E/FY-2G satellites， the thermal infrared anomalies preceding the Yinchuan Ms4.8 and Ms4.6 earthquakes and six Ms⩾4.0 events along the western margin of Ordos Block since 2009 were analyzed using the wavelet transform and relative power spectrum variation methods. Results demonstrate a consistent evolutionary pattern："emergence $$ expansion $$ attenuation ⋅- dissipation.”For the Yinchuan earthquakes，TBB anomalies initiated on August 27，2O24，followed by OLR anomalies on November 22， 2024， both peaking prior to the mainshocks. Approximately two months prior to the earthquakes，the TBB power spectrum deviated markedly from background levels，with maximum amplitudes exceeding background values by eightfold. The six historical earthquakes along the western margin of Ordos Block exhibited identical evolutionary characteristics：epicenters generally located within fault zones on the edges of anomaly areas;mainshocks occurring 22-94 days after peak anomalies;and relative power spectrum amplitudes ⩾4 times background values for 20-61 days. These findings provide foundational parameters for thermal infrared monitoring of regional Ms4.0-5.0 earthquakes and validate the efficacy of satellite thermal infrared technology in capturing seismic precursors.

Keywords： Yinchuan earthquakes; geostationary satelite; thermal infrared remote sensing relative power spectrum anomalies

0 引言

1988年，Gorny等[1]率先提出将热红外遥感数据用于地震异常监测，引起了国内外众多地震研究者的广泛关注。（剩余12358字）