| 2018年5月28日松原MS 5.7地震前热红外亮温异常分析 |
| |
| 引用本文： | 李梦莹,张志宏,孔祥瑞,黄明威,钱蕊,张丽.2018年5月28日松原MS 5.7地震前热红外亮温异常分析[J].地震地磁观测与研究,2019,40(5):85-92. |
| |
| 作者姓名： | 李梦莹 张志宏 孔祥瑞 黄明威 钱蕊 张丽 |
| |
| 作者单位： | 中国沈阳 110034 辽宁省地震局 |
| |
| 基金项目： | 辽宁省科学技术计划（项目编号：2019JH8/10300108） |
| |
| 摘 要： | 2018年5月28日吉林松原发生M_S 5.7地震。为了分析松原地震前可能与地震有关的热红外亮温异常,收集了以震中为中心的38°—50°N、116°—134°E范围内,2013年1月1日—2018年6月18日静止气象卫星FY-2G观测的地表亮温资料,应用连续小波变换方法计算了每一个像元的小波相对能谱,得到了分析区域内相对能谱的时、空演化规律。结果显示,地震前1周吉林—丰满断裂周围出现相对能谱值超出背景值的异常现象;且随着地震的临近,异常区域沿着松花江第二断裂带向NW方向扩展,异常幅度随之增大。地震发生后异常幅度及面积继续增大,直至震后1个月异常逐渐消失。含油气盆地地下大量天然气对震前应力的变化较敏感,当应力积蓄到一定程度,盆地周缘的活动构造带及一些微裂隙都是天然气上涌的通道,而溢出地表的甲烷、二氧化碳等温室气体辐射增温效果明显。在震前,盆地出现大片区域的辐射增温异常可能与天然气外泄有关,或许可以解释松原M_S 5.7地震震中位于异常区外边缘的现象。
|
| 关 键 词： | 松原MS5.7地震 亮温 热异常 小波变换 小波相对能谱 |
Analysis of thermal infrared brightness temperature anomalies before Songyuan MS 5.7 earthquake on May 28, 2018 |
| |
| Li Mengying,Zhang Zhihong,Kong Xiangrui,Huang Mingwei,Qian Rui,Zhang Li.Analysis of thermal infrared brightness temperature anomalies before Songyuan MS 5.7 earthquake on May 28, 2018[J].Seismological and Geomagnetic Observation and Research,2019,40(5):85-92. |
| |
| Authors: | Li Mengying Zhang Zhihong Kong Xiangrui Huang Mingwei Qian Rui Zhang Li |
| |
| Institution: | Liaoning Earthquake Agency, Shenyang 110034, China |
| |
| Abstract: | Songyuan MS 5.7 earthquake occurred in Jilin on May 28, 2018. In order to analyze the thermal infrared brightness anomalies, which may be associated with the earthquake before the Songyuan earthquake, the daily brightness temperature data from the Chinese geostationary meteorological satellite FY-2G were used for the period from January 2013 to July 2018 with the spatial region 116°-134°E longitude by 38°-50°N latitude. The wavelet relative power spectrum of each pixel is calculated by the continuous wavelet transform method and obtained the time-space evolution process of the relative power spectrum in the region. The results show that in the week before the earthquake, the relative wavelet power spectrum of Jilin-Fengman fault exceeds the background value. With the earthquake approaching the anomalous areas extend along the Songhua river second fault along the NW direction, and the anomaly amplitude increases. After the earthquake, the anomaly amplitude and areas continue to increase until the anomaly gradually disappears one month after the earthquake. A large amount of natural gas underground in petroliferous basins is sensitive to the change of pre-earthquake stress. When the seismic stress accumulates to a certain extent, the active structural belts and some micro-fractures around the basin are the channels for natural gas upwelling and the methane and carbon dioxide emissions from the earth's surface can increase the temperature obviously. Before the earthquake, the radiation anomaly in a large area of the basin may be related to natural gas leakage, which may explain why the epicenter of the Songyuan MS 5.7 earthquake is at the edge of the anomalous area. |
| |
| Keywords: | Songyuan MS 5 7 earthquake brightness temperature thermal anomaly wavelet transform relative wavelet power spectrum |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地震地磁观测与研究》浏览原始摘要信息 |
| 点击此处可从《地震地磁观测与研究》下载免费的PDF全文 |
|
