Three-dimensional nu(sub p) and nu(sub p)/nu(sub s) structure of the Hengill triple junction and geothermal area, Iceland, and the repeatability of tomographic inversion

Details Three-dimensional nu(sub p) and nu(sub p)/nu(sub s) structure of the Hengill triple junction and geothermal area, Iceland, and the repeatability of tomographic inversion Three-dimensional nu(sub p) and nu(sub p)/nu(sub s) structure of the Hengill triple junction and geothermal area, Iceland, and the repeatability of tomographic inversion

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1309f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 10, p. 1309-1312

Mathematics

Logic

11

Earth Crust, Earthquakes, Geological Faults, Geothermal Anomalies, Iceland, Structural Properties (Geology), Tomography, Data Correlation, Propagation Velocity, Seismic Waves, Wave Propagation

Scientific paper

We investigate the crustal structure of the Hengill triple junction in southwestern Iceland, applying tomographic methods to local earthquake data recorded in two field experiments with different network geometries and instrumentation. Data from the two experiments enable us to derive three-dimensional models of the compressional-wave speed nu(sub p) and the wave-speed ration nu(sub p)/nu(sub s). Well resolved high-nu(sub p) bodies correlate with sites of gabbroic intrusions. A small reduction in nu(sub p)/nu(sub s) associated with the high-temperature part of the geothermal area is probably due to mineral alteration or supercritical fluids. The root-mean-square (RMS) difference between the two nu(sub p) models, about 0.26 km/s, indicates the approximate repeatability that may be expected of good tomographic inversions.

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