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Passive seismic imaging using microearthquakes

机译:使用微地震的被动地震成像

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We have developed a method of processing seismic signals generated by microearthquakes to image local subsurface structure beneath a recording station. This technique uses the autocorrelation of the vertically traveling earthquake signals to generate pseudoreflec-tion seismograms that can be interpreted for subsurface structure. Processed pseudoreflection data, from microearthquakes recorded in the island of Hawaii, show consistent reflectivity patterns that are interpreted as near-surface horizontal features. Forward modeling of the pseudoreflection data results in a P-wave velocity model that shows reasonable agreement with the velocity model derived from a refraction study in the region. Usable signal-to-noise ratio is obtained down to 2 s. A shear-wave velocity model was also generated by applying this technique to horizontal component data.
机译:我们已经开发出一种处理微地震产生的地震信号的方法,以对记录台下的局部地下结构进行成像。该技术使用垂直传播的地震信号的自相关来生成可解释为地下结构的伪反射地震图。来自夏威夷岛记录的微地震的处理后伪反射数据显示出一致的反射率模式,这些模式被解释为近地表水平特征。伪反射数据的正向建模产生了一个P波速度模型,该模型显示出与该地区折射研究得出的速度模型有合理的一致性。可获得低至2 s的可用信噪比。通过将该技术应用于水平分量数据,还生成了横波速度模型。

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