| 震前卫星红外亮温异常时空演化特征分析 |
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| 引用本文： | 闫丽莉,高文晶,王建国,张孟怡.震前卫星红外亮温异常时空演化特征分析[J].西北地震学报,2021,43(1):90-98. |
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| 作者姓名： | 闫丽莉 高文晶 王建国 张孟怡 |
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| 作者单位： | 天津市地震局, 天津 300201 |
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| 基金项目： | 中国地震局地震科技星火计划攻关项目“天津地球物理台网智能化产出与应用研究”（XH20002）和天津市地震局局内课题“利用MODIS地表温度监测华北地区地震活动”（zd201905）联合资助[ZK） |
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| 摘 要： | 主要利用统计方法建立红外亮温背景场及异常检测模型,来提取2012年华北地区的红外亮温异常信息,并对2012年唐山4.8级地震和宝坻4.0级地震前的异常演化过程进行分析研究。结果表明:背景场方面,红外亮温的多年月背景场具有夏高冬低的年变特征,符合季节变化规律,红外亮温与高程呈负相关关系;基于历年同期亮温偏移指数K值方面,2012年5月28日唐山4.8级地震震前在唐山断裂带以南存在明显强烈的K值异常,在震前8小时达到最大约3.3。6月18日宝坻4.0级地震在震前也存在红外亮温异常现象,但是较弱。
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| 关 键 词： | 红外亮温 亮温背景场 K值异常 唐山地震 宝坻地震 |
| 收稿时间： | 2020/10/21 0:00:00 |
Spatio-temporal Evolution Characteristics of Satellite Infrared Brightness Temperature Anomalies before Earthquakes |
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| YAN Lili,GAO Wenjing,WANG Jianguo,ZHANG Mengyi.Spatio-temporal Evolution Characteristics of Satellite Infrared Brightness Temperature Anomalies before Earthquakes[J].Northwestern Seismological Journal,2021,43(1):90-98. |
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| Authors: | YAN Lili GAO Wenjing WANG Jianguo ZHANG Mengyi |
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| Institution: | Tianjin Earthquake Agency, Tianjin 300201, China |
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| Abstract: | In this paper, the infrared brightness temperature background field and the anomaly detection model were established by the statistical method to extract the infrared brightness temperature anomalies in North China, and the evolution process of anomalies before the Tangshan M4.8 and Baodi M4.0 earthquakes in 2012 were analyzed. The results indicated that:(1) The monthly background field of infrared brightness temperature has the annual variation characteristics of being higher in summer and lower in winter, which is in line with the seasonal variation law, and the infrared brightness temperature has a negative correlation with the elevation; (2) Based on the K-value data of brightness temperature over the same period in previous years, it was found that strong K-value anomalies were shown in the south of Tangshan fault zone before the Tangshan M4.8 earthquake on May 28, 2012, and 8 hours before the earthquake, the maximum value reached 3.3. Before the Baodi M4.0 earthquake on June 18, a weak anomaly of infrared brightness temperature also existed. |
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| Keywords: | infrared brightness temperature brightness temperature background field K-value anomaly Tangshan earthquake Baodi earthquake |
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