Cepstrum-based Analysis on the "8·12" Explosions of Tianjin Harbor, 2015
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摘要: 本文通过对记录到2015年天津港“8·12”爆炸的32个台站的三分量数字地震波形进行倒谱分析，得到了以下结论：①2个主要爆炸的发生时间间隔约为32.3s；②爆炸-2发生在爆炸-1的西北侧约353°处；③依据这些记录的倒谱，无法判定在爆炸-1前是否还存在微小的爆炸。以上结论均与前人研究成果吻合。由于倒谱叠加采用的是全波形，对滤波频带不敏感，因此，在检测发生在同一地点的多次爆炸或其它类似事件（如核爆）上有一定的优势。
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关键词:
- “8·12”天津港爆炸 /
- 倒谱 /
- 叠加 /
- 方位角
Abstract: By analyzing the cepstra of three component waveforms from 32 stations, which recorded the "8·12" explosions in Tianjin harbor, we found that: ① the time difference between the two massive explosions was 32.3s; ② the second explosion occurred on northwest of the first explosions, with azimuth about 353°; ③ it was not able to determine whether there existed a small explosion before the explosion-1 or not. All the above findings are consisted well with previous studies. However, in the cepstra-stacking method used in this paper, we applied full waveforms instead of partial waveforms in other studies, and it is not sensitive to filters band. Therefore, our cepstra-stacking method in this study is more efficient than correlation detection method in detecting the explosions with similar events (such as nuclear explosions) happened at the same site.-
Key words:
- "8·12" explosions of Tianjin Harbor /
- Cepstrum /
- Stacking /
- Azimuth
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图 1 爆炸(红色星号)附近地震台站(黑色三角形)分布
Figure 1. The distribution of seismic stations (black triangles) near the explosion site (red star)
图 2 DOH台垂向分量波形记录及其倒谱
(a)DOH台垂向分量波形记录；(b)DOH台垂向分量波形记录的倒谱；(c)图(b)中0—3s的放大；(d)图(b)中31—34s的放大
Figure 2. Vertical component waveform and its cepstrum from station DOH
图 3 32条垂向记录的倒谱及其叠加
(a)32条垂向波形记录的倒谱(黑色)及其叠加(红色)，其中Δ为震中距(km)；(b)图(a)中0—3s的放大；(c)图(a)中31—34s的放大
Figure 3. The cepstra records of all the 32 vertical component waveforms and the stacking of them
图 4 20—40Hz(a)与10—20Hz(b)后0—3s的倒谱叠加波形
Figure 4. The cepstral-stacking waveforms of 0—3s filtered with 20—40Hz (a) and 10—20Hz (b)
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