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应用于评价活动断层的地震方法技术
SEISMIC TECHNIQUE APPLIED TO ACTIVE FAULT ASSESSMENT
【摘要】 以在上海市区开展地震调查深埋活断层的实例,讨论了在都市区强干扰条件下开展断层活动性调查的地震方法技术。认为:在对基岩断层的活动性评价中,反射纵波法根据基岩断层是否向上延伸到第四纪Q3地层内,而剪切波分裂法则根据由Q3地层内界面反射横波确定的各向异性。当基岩断层向第四系延伸幅度较大,即第四纪地层内断层落差较大时,可采用反射纵波法;当基岩断层活动引起的第四纪地层内的断层落差较小,反射纵波法不能对其分辨时,可采用剪切波分裂法
【Abstract】 Seismic technique plays an important role in active fault assessment. T he P-wave reflection and shear wave splitting methods are used in using seismic technique for active fault assessment. The P-wave reflection method is based on the fact that whether the fault of bedrock extends up to Quaternary strata Q 3 or not. The shear wave splitting method is based on anisotropy of Quaternary str ata Q 3 determined by transverse wave. The P-wave reflection method can be adop ted when large scale fault extend up to Quaternary strata, whereas, the shear wave s plitting method can be adopted.
- 【文献出处】 地质与勘探 ,GEOLOGY AND PROSPECTING , 编辑部邮箱 ,1999年01期
- 【分类号】P631.425
- 【被引频次】7
- 【下载频次】106