京津冀地区多种地球物理观测对天津爆炸事件的响应

Multiple geophysical observation response to the Tianjin explosion in Beijing-Tianjin-Hebei region

本文利用京津冀地区地球物理观测数据和卫星热红外遥感数据,研究了2015年8月12日天津港地面爆炸时的地球物理响应,获得了爆炸点周边的地球物理场扰动信息.结果表明:1事件点附近地电阻率对地面爆炸的响应较为明显,事件发生后地电阻率观测曲线幅值急剧变小,且持续很长时间;2事件发生的前后两天,地电场观测曲线出现了小幅升降异常,且与空间电子流量微小幅度下降的时间相同,而相应时段的地磁场则无相关扰动;3卫星热红外亮温在事件发生后明显增强,持续数天后恢复至事件前水平;4事件点周围的地下水位和形变测量未见明显响应.上述结果表明不同的地球物理观测对该事件的响应有差异,这对于分析和研判与地震等相关的异常具有参考意义,同时本文讨论的观测结果也有利于深入认知天津爆炸事件的过程.

The surface explosion occurred in Tanggu district of Tianjin on August 12, 2015 caused wide attention. This paper presented the geophysical observation response to this explosion based on the data from a number of geophysical observation stations in Beijing-Tianjin-Hebei region as well as the satellite infrared remote sensing data, and obtained the geophysical disturbances information around the point. The results showed that the response of georesis- tivity to the explosion near the event site is apparent, that is, the georesistivity curve declined rapidly after this event and lasted for a long time.It was also observed that the geoelectric field anomalies appeared with a small amplitude two days before and after the event, and the space electronic flow declined slightly synchronously, however, no disturbances of geomagnetic field appeared at the same period. Meanwhile, the satellite infrared brightness temperature significantly increased after the event, and lasted for several days. In addition, there was no obvious response of underground water level and deformation to the event. The results indicate that different types of observations have different responses to this event, it will he valuable for analyzing and determing the anomalies related to earthquake in the future. What is more, it is also useful for a deeper cognition for the process of Tianjin explosion.