ADVANCED WAVEFORM SIMULATION FOR SEISMIC MONITORING EVENTS

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Abstract We conduct a detailed test of a recently developed technique, CAPloc, in recovering source parameters from a few stations against results from a large broadband network in Southern California. The method uses a library of 1D Green’s functions which are broken into segments and matched to waveform observations with adjustable timing shifts. These shifts can be established by calibration against a distribution of well-located earthquakes and assembled in tomographic images for predicting various phase-delays. Synthetics generated from 2D cross-sections through these models indicates that 1D synthetic waveforms are sufficient in modeling but simply shifted in time for most hard-rock ... continued below

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Helmberger, Donald V.; Tromp, Jeroen & Rodgers, Arthur J. January 27, 2009.

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Description

Abstract We conduct a detailed test of a recently developed technique, CAPloc, in recovering source parameters from a few stations against results from a large broadband network in Southern California. The method uses a library of 1D Green’s functions which are broken into segments and matched to waveform observations with adjustable timing shifts. These shifts can be established by calibration against a distribution of well-located earthquakes and assembled in tomographic images for predicting various phase-delays. Synthetics generated from 2D cross-sections through these models indicates that 1D synthetic waveforms are sufficient in modeling but simply shifted in time for most hard-rock sites. This simplification allows the source inversion for both mechanism and location to easily obtain by grid search. We test one-station mechanisms for 160 events against the array for both PAS and GSC which have data since 1960. While individual solutions work well (about 90%), joint solutions produce more reliable and defensible results. Inverting for both mechanism and location also works well except for certain complex paths across deep basins and along mountain ridges.

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  • Report No.: DOE DE-FC52-06NA27319
  • Grant Number: FC52-06NA27319
  • DOI: 10.2172/950710 | External Link
  • Office of Scientific & Technical Information Report Number: 950710
  • Archival Resource Key: ark:/67531/metadc926969

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  • January 27, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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Helmberger, Donald V.; Tromp, Jeroen & Rodgers, Arthur J. ADVANCED WAVEFORM SIMULATION FOR SEISMIC MONITORING EVENTS, report, January 27, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc926969/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.