文章摘要
惠少兴,魏从信,金昭娣.青藏高原东北缘2次地震热红外亮温异常分析[J].地震工程学报,2019,41(1):177-182. HUI Shaoxing,WEI Congxin,JIN Zhaodi.Thermal Infrared Brightness Temperature Anomalies of TwoEarthquakes on the Northeastern Margin ofthe Qinghai-Tibet Plateau[J].China Earthquake Engineering Journal,2019,41(1):177-182.
青藏高原东北缘2次地震热红外亮温异常分析
Thermal Infrared Brightness Temperature Anomalies of TwoEarthquakes on the Northeastern Margin ofthe Qinghai-Tibet Plateau
投稿时间:2017-08-20  
DOI:10.3969/j.issn.1000-0844.2019.01.177
中文关键词: 2次地震;热红外亮温;相对功率谱;对比分析
英文关键词: two earthquakes;thermal infrared brightness temperature;relative power spectrum;comparative analysis
基金项目:中国地震局预测研究所基本科研业务专项(2015IESLZ02);陕西省地震局启航与创新基金(QC201805)共同资助
作者单位E-mail
惠少兴 陕西省地震局, 陕西 西安 710068  
魏从信 中国地震局兰州地震研究所, 甘肃 兰州 730000 weicx@gsdzj.gov.cn 
金昭娣 陕西省地震局, 陕西 西安 710068  
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中文摘要:
      应用静止气象卫星FY-2G的TBB产品为基础数据,针对2017年9月30日四川青川5.4级和2017年10月31日甘肃临潭4.3级地震前后出现在震中区附近的显著热红外异常,运用小波变换和相对功率谱法进行异常提取和资料分析。结果表明:青川地震热红外异常范围主要分布在震中东南区域,震前4个月左右出现功率谱增强现象,持续2个月左右。临潭地震热红外异常范围主要分布在震中的西南方向,震前20 d左右出现异常增强现象,随时间推移,异常范围逐渐向西南扩大,震前14 d异常开始收缩并减弱,异常持续30 d左右。通过对比2次震例,发现热异常特征有许多共同点,其中相同的特征周期可为中强地震前兆特征的归纳提供重要参考信息。
英文摘要:
      To investigate the markedly thermal infrared anomalies in epicentral areas before and after the Qingchuan, Sichuan MS5.4 earthquake on September 30, 2017 and the Lintan, Gansu MS4.3 earthquake on October 31, 2017, in this study, we collected TBB data from China's geostationary meteorological satellite FY-2G and analyzed the data and spectra using the wavelet- and relative-power-spectrum transform methods. The results show that the thermal infrared anomaly range of the Qingchuan earthquake is mainly distributed in the southeast of the epicenter, and that power spectrum enhancement occurs about four months prior to the earthquake and lasts for about two months. The thermal infrared anomalies of the Lintan earthquake are mainly distributed southwest of the epicenter, with an anomalous enhancement phenomenon occurring about 20 days prior to the earthquake. With the passage of time, this anomaly range expands further southwest. These anomalies begin to shrink and weaken 14 days before the earthquake, and last for about 30 days. A comparison of the two earthquakes shows that there are many common characteristics in their thermal anomalies, which can provide significant reference information for determining the seismic precursor characteristics of moderate-strong earthquakes.
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