Cepstrum-based Analysis on the "8·12" Explosions of Tianjin Harbor, 2015
-
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。
-
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
-
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)
-
陈运泰, 吴忠良, 王培德等, 2000.数字地震学.北京:地震出版社. 凤凰资讯, 2016.天津港爆炸事故调查报告公布.(2016-02-05).http://news.ifeng.com/a/20160205/47374334_0.shtml. 高伟, 王宁, 陈川, 2013.利用船舶噪声的自相关与倒谱联合估计多径时延.声学学报, 38(5):523-532. http://www.cnki.com.cn/Article/CJFDTOTAL-XIBA201305003.htm 郭祥云, 王淑辉, 魏富胜, 2010.小震级地震事件的倒谱差异.地震地磁观测与研究, 31(1):12-16. doi: 10.3969/j.issn.1003-3246.2010.01.003 李晔, 许可, 柳艳丽等, 2017.天津港爆炸的地震学研究.中国科技成果, (15):35-41. doi: 10.3772/j.issn.1009-5659.2017.15.019 魏富胜, 黎明, 2003.震源性质的倒谱分析.地震学报, 25(1):47-54. doi: 10.3321/j.issn:0253-3782.2003.01.006 魏富胜, 许忠淮, 郭祥云, 2010.朝鲜半岛2次不同震源类型地震事件的倒谱特征.地震地磁观测与研究, 31(4):1-6. doi: 10.3969/j.issn.1003-3246.2010.04.001 解滔, 郑晓东, 张䶮, 2016.基于线性预测倒谱系数的地震相分析.地球物理学报, 59(11):4266-4277. doi: 10.6038/cjg20161127 章鑫, 杜学彬, 张元生等, 2016.京津冀地区多种地球物理观测对天津爆炸事件的响应.地震学报, 38(2):283-297. http://d.old.wanfangdata.com.cn/Periodical/dizhen201602012 郑秀芬, 欧阳飚, 张东宁等, 2009."国家数字测震台网数据备份中心"技术系统建设及其对汶川大地震研究的数据支撑.地球物理学报, 52(5):1412-1417. doi: 10.3969/j.issn.0001-5733.2009.05.031 Bakun W. H., Johnson L. R., 1973. The deconvolution of teleseismic P waves from explosions Milrow and Cannikin. Geophysical Journal International, 34(3):321-342. doi: 10.1111/j.1365-246X.1973.tb02399.x Cohen T. J., 1970. Source-depth determinations using spectral, pseudo-autocorrelation and cepstral analysis. Geophysical Journal International, 20(2):223-231. doi: 10.1111/j.1365-246X.1970.tb06065.x Li J., Tian X. F., 2015. Refined locations of major explosions in Tianjin harbor. Science Bulletin, 60(21):1868-1870. doi: 10.1007/s11434-015-0913-x Papoulis A., 1962, The Fourier integral and its applications. New York: McGraw-Hill Book Company, Inc. Schaff D. P., Waldhauser F., 2005. Waveform cross-correlation-based differential travel-time measurements at the Northern California seismic network. Bulletin of the Seismological Society of America, 95(6):2446-2461. doi: 10.1785/0120040221 Zhao X., Feng W., Tan Y. P., et al., 2016. Seismological investigations of two massive explosions in Tianjin, China. Seismological Research Letters, 87(4):826-836. doi: 10.1785/0220150229 -
下载:
点击查看大图
计量
- 文章访问数: 47
- HTML全文浏览量: 14
- PDF下载量: 15
- 被引次数: 0
