A demonstration of the joint use of P wave polarization and travel-time data in tomographic inversion - Crustal velocity structure near the South Iceland Lowland network

Details A demonstration of the joint use of P wave polarization and travel-time data in tomographic inversion - Crustal velocity structure near the South Iceland Lowland network A demonstration of the joint use of P wave polarization and travel-time data in tomographic inversion - Crustal velocity structure near the South Iceland Lowland network

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1407h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 13, p. 1407-1410.

Physics

2

Earth Crust, P Waves, Polarization (Waves), Propagation Velocity, Seismic Waves, Tomography, Iceland, Time Dependence, Volcanoes

Scientific paper

A joint inversion of both P-wave travel-time and polarization direction data is performed on a data set from the South Iceland Lowland network. The rms reduction of the polarization and travel-time residuals are 72 percent and 76 percent, respectively. Furthermore, travel-time residuals drop 45 percent even when they are given no weight in the inversion, indicating that the polarization measurements are related to the same regional-scale velocity heterogeneities thought to cause the travel-time anomalies. The results show two crustal low-velocity zones trending NE across the study area, a direction that is subparallel to the strike of the Western Volcanic Zone in south Iceland.

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