Comparative Study on Thermal Infrared Anomaly Characteristics of Several Moderate and Strong Earthquakes in Yunnan Province

doi:10.7517/issn.1674-0475.181101

Abstract

Abstract: Yunnan province is located at the block boundaries, with active tectonic activity and frequent seismic activity.After using the "time-frequency relative power spectrum" (T-F RPS) method based on Chinese Geostationary Meteorological Satellite infrared remote sensing brightness temperature data processing, we rapidly and accurately extracted and identified pre-earthquake thermal infrared anomalies information of earthquakes above Ms 5.5 since 2008 in Yunnan Province.The parameters such as feature period, feature amplitude, abnormal form and abnormal evolution process are compared and analyzed. The results show that:(1) we can extract and identify seismic thermal infrared anomaly information by time-frequency relative power spectrum method(T-F RPS).The abnormal features obey the rule of "occurred-expand-recede-disappeared". (2) The characteristic period and duration of anomaly have some regularity. (3) The abnormal expand along the fault, and the epicenter is located on the side of the abnormal edge or at the intersection of the abnormal area. The origin time is mostly in the decreasing phase of relative power spectrum. (4) The magnitude is correlated with the peak of relative power spectrum. The higher the magnitude, the higher the value. (5) There is a certain correlation between the type of earthquake and the abnormal area. The anomaly area of double-seismic is large. In addition, we also discuss the relationship between thermal infrared anomalies of earthquakes and tectonic activities, climatic conditions, weather conditions and seasons.

Key words: earthquakes in Yunnan, relative power spectrum, thermal infrared anomaly features, relative ana-lysis

WANG Ying, ZHANG Yuansheng, WEI Congxin. Comparative Study on Thermal Infrared Anomaly Characteristics of Several Moderate and Strong Earthquakes in Yunnan Province[J]. Imaging Science and Photochemistry, 2019, 37(3): 215-226.

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