天津港“8·12”爆炸事件记录波形分析

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。

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

This study conducts a preliminary analysis of waveform data from a series of explosive events that occurred in Tianjin harbor on August 12, 2015, which were recorded by 23 short-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 determined by applying the master event location algorithm. Analysis results show that the first explosion occurred at 23:34:04 on August 12, 2015, and a larger blast then occurred after 1.77 s. The third event was the largest and occurred 34.11 s after the first event, and the last explosion occurred 86.33 s after the first. The second and third explosions occurred 65~70 m apart, and the second explosion was 160~170 m 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.