天津港"8.12"爆炸事件记录波形分析

Analysis of Recorded Waveform During the 8·12 Explosion Incident in Tianjin Harbor

利用天津地震台网23个短周期地震仪记录到的2015年8月12日天津港爆炸事件波形数据,对事件进行初步分析和研究。分别使用能量包络线法和波形匹配法,共识别出4次爆炸事件,并结合波形互相关的主事件定位法对爆炸事件进行定位。分析结果表明:第一次爆炸发生的时间为2015年8月12日23时34分4秒,1.77s后发生了规模更大的二号爆炸事件;34.11s后又发生了最强的三号爆炸事件;86.33s再一次发生了能量较弱的四号爆炸事件,其中二号与三号爆炸事件相距65~70m,二号与四号事件相距160~170m。此外,通过选用爆破、矿塌、核爆和天然地震等不同类型事件的波形数据,从时间域和频率域分别对这些事件进行对比分析,发现其震相特征表现出明显差异。

This study conducts a preliminary analysis of waveform data from a series of explosive events that occurred in Tianjin harbor on August12,2015,which were recorded by23short-period seismometers of the China Seismograph Network in Tianjin.Four explosive events were identified using the envelope method and wave matching method,and their locations were deter-mined by applying the master event location algorithm.Analysis results show that the first explo-sion occurred at23:34:04on August12?2015,and a larger blast then occurred after1.77s.The third event was the largest and occurred34.11s after the first event,and the last explosion occurred86.33s after the first.The second and third explosions occurred65"^70m apart,and the second explosion was160^170m from the fourth.This paper also compares waveform data of explosions?mine collapse^nuclear explosion,and a natural earthquake in the time and frequency domains,respectively?and results show that there are strong differences between the seismic phase characteristics of these events.