大当量爆破地震波记录分析
|
摘要
通过对首都圈地震台网和河北地震局流动台网大当量爆破记录的分析,发现爆破激发的地震波传播特性与天然地震波有明显差异,其主要特征有:1)爆破能量衰减很快,总体以e-1.5衰减;但是近场(<20 km)与远场(>20 km)衰减有显著差异;2)部分远场台站有能量增强的现象,震波振幅的增减与井下观测还是地面观测无关,与场地效应等关系密切,反映了某些区域各种波的多次叠加效应;3)爆破的S波传播速度明显低于天然地震,P波差异较小,可能与爆破源不利于剪切波的激发有关。
Through the analysis on the records of digital seismic network in the Capital area and mobile network of the Earthquake Administration of Hebei Province,it is found that explosive seismic wave is obviously different in its propagating feature from that of the natural seismic wave.The main characteristics of the explosion are as follows: 1) the explosive energy decayes quickly,wholly with e-1.5;but the decaying rate is apparently different in near field(<20 km) and far field(>20 km);2) there are phenomenon of increasing energy at part of far field stations;the increase and decrease of the amplitude of explosion wave is not related to the station location of well or ground,but to the site effect,which reflects the overlapping effect of many kinds of waves;3) the S wave velocity of explosion is obvious lower than that of natural earthquake,while P wave velocity is similar,it may be related to the cause that explosion is not favorable to stimulate shear wave.
Through the analysis on the records of digital seismic network in the Capital area and mobile network of the Earthquake Administration of Hebei Province,it is found that explosive seismic wave is obviously different in its propagating feature from that of the natural seismic wave.The main characteristics of the explosion are as follows: 1) the explosive energy decayes quickly,wholly with e-1.5;but the decaying rate is apparently different in near field(<20 km) and far field(>20 km);2) there are phenomenon of increasing energy at part of far field stations;the increase and decrease of the amplitude of explosion wave is not related to the station location of well or ground,but to the site effect,which reflects the overlapping effect of many kinds of waves;3) the S wave velocity of explosion is obvious lower than that of natural earthquake,while P wave velocity is similar,it may be related to the cause that explosion is not favorable to stimulate shear wave.
引文
1李松林,樊纪昌,吴宁远.地震测深资料解释的新方法[M].北京:地震出版社,2006.
2 Huang Jin li and Zhao Dapeng.Crustal heterogene ity andse ismotecton ics of the region around Be ijing,Ch ina[J].Tectonophysics,2004,385:159-180.
3于湘伟,陈运泰,王培德.京津唐地区中上地壳三维P波速度结构[J].地震学报,2003,25(1):1-14.
4邓起东.断层性状、盆地类型及其形成机制[J].地震科学研究,1984,2:57-64.
5嘉世旭,张先康.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,2005,48(3):611-620.
6赵明淳,刁桂苓,张学民.首都圈平均波速比分析[J].西北地震学报,2005,27(3):246-250.
7胡新亮,等.华北、西南一些地区地震发生在地壳浅部的证据[J].地震学报,2001,23(4):427-435.
①王林瑛,等.首都圈地区地震波速比时空变化特征研究[R].2008.
2 Huang Jin li and Zhao Dapeng.Crustal heterogene ity andse ismotecton ics of the region around Be ijing,Ch ina[J].Tectonophysics,2004,385:159-180.
3于湘伟,陈运泰,王培德.京津唐地区中上地壳三维P波速度结构[J].地震学报,2003,25(1):1-14.
4邓起东.断层性状、盆地类型及其形成机制[J].地震科学研究,1984,2:57-64.
5嘉世旭,张先康.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,2005,48(3):611-620.
6赵明淳,刁桂苓,张学民.首都圈平均波速比分析[J].西北地震学报,2005,27(3):246-250.
7胡新亮,等.华北、西南一些地区地震发生在地壳浅部的证据[J].地震学报,2001,23(4):427-435.
①王林瑛,等.首都圈地区地震波速比时空变化特征研究[R].2008.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心