Amplitude path corrections for regional phases in China

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Description

The authors investigate the effectiveness of amplitude path corrections for regional phases on seismic event discrimination and magnitude estimation. Waveform data from digital stations in China for regional, shallow (< 50 km) events were obtained from the IRIS Data Management Center (DMC) for years 1986 to 1996 using the USGS Preliminary Determination of Epicenters (PDE) and the Chinese State Seismological Bureau (SSB) catalogs. For each event, the amplitudes for each regional phase (P{sub n}, P{sub g}, S{sub n}, L{sub g}) were measured, as well as the P{sub g} and L{sub g} coda. Measured amplitudes were corrected for source scaling using ... continued below

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9 p.

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Phillips, W.S.; Velasco, A.A.; Taylor, S.R. & Randall, G.E. December 31, 1998.

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  • Los Alamos National Laboratory
    Publisher Info: Los Alamos National Lab., Earth and Environmental Sciences Div., NM (United States)
    Place of Publication: New Mexico

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Description

The authors investigate the effectiveness of amplitude path corrections for regional phases on seismic event discrimination and magnitude estimation. Waveform data from digital stations in China for regional, shallow (< 50 km) events were obtained from the IRIS Data Management Center (DMC) for years 1986 to 1996 using the USGS Preliminary Determination of Epicenters (PDE) and the Chinese State Seismological Bureau (SSB) catalogs. For each event, the amplitudes for each regional phase (P{sub n}, P{sub g}, S{sub n}, L{sub g}) were measured, as well as the P{sub g} and L{sub g} coda. Measured amplitudes were corrected for source scaling using estimates of m{sub b} and for distance using a power law that accounts for attenuation and spreading. The amplitude residuals were interpolated and mapped as 2-D amplitude correction surfaces. The authors employ several methods to create the amplitude correction surfaces: a waveguide method, and two interpolation methods (Baysian kriging and a circular moving window mean smoother). They explore the sensitivities of the surfaces to the method and to regional propagation, and apply these surfaces to correct amplitude data to reduce scatter in discrimination ratios and magnitude estimates.

Physical Description

9 p.

Notes

OSTI as DE99002084

Source

  • 20. annual seismic research symposium on monitoring a comprehensive test ban treaty, Santa Fe, NM (United States), 21-23 Sep 1998

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  • Other: DE99002084
  • Report No.: LA-UR--98-3121
  • Report No.: CONF-980920--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 325733
  • Archival Resource Key: ark:/67531/metadc686758

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 3, 2016, 1:22 p.m.

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Phillips, W.S.; Velasco, A.A.; Taylor, S.R. & Randall, G.E. Amplitude path corrections for regional phases in China, article, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc686758/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.