摘要
利用中国静止气象卫星亮温资料,以小波变换和功率谱估计为研究方法对2016年西藏聂荣M_S5.1地震进行了分析。结果显示,震前4个月多出现异常,随时间演化主要分布在震中以南,震中处在其北边缘。相对功率谱大于6倍的异常面积约为60 000 km^2,这种大面积状态持续近20 d。相对功率谱时序曲线在其背景值及标准差之上出现了大幅偏离,持续的高值偏离在8月19日(震前108 d)达到峰值,最大幅值为平均值的9倍,持续偏离时间为62 d。异常时空特征具有短期预测意义,可为西藏地区地震监测提供震例经验。
In order to study the thermal anomalies before Nierong earthquake with Ms 5.1 happened on December 5th ,2016, we use wavelet transformation and power spectrum estimate methods to ana- lyze thermal infrared brightness date from China Geostationary Meteorological satellite. The results show that the anomalies appear 4 months more before Nierong earthquake. Anomalies mainly distrib- ute in the south of the edge of epicenter. The maximum area that more over 6 times is about 60 000 km^2, which lasts for 20 days. The relative power spectrum appreciably deviate from back- ground value and standard deviation before earthquake ,the peak that occurs on August 19th is almost 9 times compared with the average value. The duration of deviation is 62 days. The trait of anomalies have important significance in short-term earthquake prediction, and provide experience for earth- quake monitoring in Tibetan regions.
作者
张丽峰
张朋涛
马茹莹
黄浩
刘文邦
ZHANG Li-feng, ZHANG Peng-tao, MA Ru-ying, HUANG Hao, LIU Wen-bang(Qinghai Earthquake Agency, Xining 810001, Qinghai, Chin)
出处
《内陆地震》
2018年第1期7-11,共5页
Inland Earthquake
基金
青海省地震科学基金(2017B06)
关键词
聂荣地震
热红外异常
相对功率谱
Nierong Earthquake
Thermal infrared Anomalies
Relative power spectrum
