An approach of refraction seismology for processing local earthquake seismograms

What is it about?

Abstract We present an approach based on controlledsource seismology (CSS) methods, especially developed for processing and modeling of the local earthquake seismograms. Record sections of the local earthquake seismogramsgenerated for multiple sourcedepths illuminate the upper crustal velocity structure inthe region. Extensive travel times and syntheticseismograms modeling of the observed record sectionsreveal the P and S velocity structure in the region. Thestrength of this approach essentially lies with the possibility of validating the upper crustal velocity modelsinferred in various subregions of the seismogenic region. A redundant and significantly large number of virtual source local earthquake seismogram sections,gathered for multiple source depths and varying sourcemechanisms in each of the subregions, validate the sameset of P and S velocity models in that region. Further, those models are found to generate the synthetic seismograms consistent with the observed sections.The proposed approach effectively utilizes a reliabledataset from a great volume of well-located local earthquake recordings of a state-of-the-art digital seismograph network. Such a dataset of local earthquakeseismograms in the Koyna-Warna active earthquakezone is used here to demonstrate this approach andobtained subregion-specific models of upper crustal Pand S velocity structure in the epicentral region. Theresults indicate that the technique presented here is efficient for processing and modeling the local earthquake seismograms and deriving upper crustal velocity models in the seismogenic regions

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Why is it important?

This is a new technique especially developed for processing and modeling the local earthquake seismograms in the seismogenic regions

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