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远震相对走时数据快速计算方法及应用

DOI: 10.6038/j.issn.0001-5733.2012.12.022, PP. 4097-4105

Keywords: 多道互相关技术,相位权重叠加,相对走时残差,远震数据,快速计算

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Abstract:

远震层析成像技术已成为研究地球深部速度结构最为主要的方法,而其所用数据通常为初至震相的相对走时残差值.本文针对信噪比差的远震波形资料提出一种计算远震相对走时残差数据的快速方法,整个计算过程全部由计算机自动完成.该方法主要有两大特点:(1)利用互相关方法计算波形间的偏移时间时引入波形相位信息,有效压制噪声,增强有用震相的识别;(2)改进常规方法中计算相对走时残差的理论公式,避免求解超定方程组,提高计算精度.为验证新方法的可行性和实用性,以长江中下游地区远震波形资料为例,采用常规方法和新方法分别计算相对走时残差数据,对比结果显示:新方法比常规方法的工作效率和数据精度都高.

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