Full Waveform Modeling of High Frequency Regional Phases for Optimization of Regional Monitoring
Technical Report,25 Jun 2015,30 Jun 2018
CONNECTICUT UNIV STORRS STORRS-MANSFIELD United States
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Radiative transport modeling combines the effects of both large-scale and small-scale structure on the envelopes of high frequency regional seismograms. We describe a computer code that propagates packets of seismic body wave energy along ray paths through large-scale deterministic 3-D structure, and small scale heterogeneities. These techniques are applied to earthquakes and explosions recorded in the Lop Nor, China region to model observed narrow band passed seismic codas in the 1 to 4 Hz band. To investigate the effects of laterally varying Earth structure on the efficiency of propagation of Lg and Pg, we apply radiative transport to model regional coda envelopes to predict the effects on waveforms of paths crossing regions of crustal thinning pull-apart basins and oceancontinent transitions and thickening collisional mountain belts. Using envelopes of regional high frequency seismograms synthesized by radiative transport algorithm, we investigate tradeoffs in model parameters describing a von Karman heterogeneity spectrum and intrinsic attenuation of the crust.