Sensitivity of seismic wide-angle wave-field and first arrival times to fine scale crustal structure and Moho topography

Details Sensitivity of seismic wide-angle wave-field and first arrival times to fine scale crustal structure and Moho topography Sensitivity of seismic wide-angle wave-field and first arrival times to fine scale crustal structure and Moho topography

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2573h&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 16, p. 2573-2576

Physics

3

Seismology: Body Wave Propagation, Seismology: Theory And Modeling

Scientific paper

A sensitivity study of stochastic crustal and Moho models on Moho refracted first arrivals is presented. The crustal model is a self-affine velocity structure superposed on a linear velocity gradient. The Moho is represented by a first-order discontinuity with a topography which is also self-affine. The sensitivity of both travel-time and wave-field is considered. We found that the full wave-field around the Pn arrival is sensitive to crustal structures down to 1 km, and to Moho undulations down to 5 km. However, the first arrivals are only sensitive to crustal structure down to about 3 km, and to Moho structure down to 10 km. Our analysis suggests that the wide-angle full wave-field has a sensitivity that is intermediate between the sensitivity of the vertically reflected wave-field and wide-angle arrival times. These findings give some justification to the mainstream ray tracing approach to wide-angle data inversion, where resulting models incorporate only a moderate number of features at relatively large scales.

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