ADVANCED WAVEFORM SIMULATION FOR SEISMIC MONITORING EVENTS

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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. 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 earthquake 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 hard-rock sites. This simplification allows the ... continued below

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Helmberger, Donald V.; Tromp, Jeroen & Rodgers, Arthur J. December 10, 2007.

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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. 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 earthquake 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 hard-rock sites. This simplification allows the source inversion for both mechanism and location to be easily obtained 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 one station 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 difficult paths that cross deep basins or propagate along mountain ridges.

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  • Report No.: DOE/DE-FC52-06NA27319
  • Grant Number: FC52-06NA27319
  • DOI: 10.2172/924033 | External Link
  • Office of Scientific & Technical Information Report Number: 924033
  • Archival Resource Key: ark:/67531/metadc895658

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  • December 10, 2007

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 7:45 p.m.

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Helmberger, Donald V.; Tromp, Jeroen & Rodgers, Arthur J. ADVANCED WAVEFORM SIMULATION FOR SEISMIC MONITORING EVENTS, report, December 10, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc895658/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.