Observations of shear wave splitting on the southeast flank of Mauna Loa volcano, Hawaii

Details Observations of shear wave splitting on the southeast flank of Mauna Loa volcano, Hawaii Observations of shear wave splitting on the southeast flank of Mauna Loa volcano, Hawaii

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1139m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 12, p. 1139-1142.

Physics

5

Anisotropic Media, Crustal Fractures, Earth Crust, Earthquakes, Seismic Waves, Hawaii, Microcracks, Traveling Waves

Scientific paper

We use a combination of particle motion covariance matrix decomposition, particle motion plots, and cross correlation to estimate the polarization and split times of shear wave arrivals from local earthquakes in the Kaoiki and Hilea regions of southern Hawaii. Consistent leading shear wave polarizations and identifiable fast and slow shear wave arrivals were frequently observed. Average delay times for the four arrays vary from 100 to 230 ms. The leading shear wave polarizations at stations in the Kaoiki region agree with the direction of the local maximum horizontal compressive stress, sigma(H), determined from focal mechanism studies and field observations of ground rupture. For the Bird Park (BP) array, in the Kaoiki region, the relationship between delay time and event depth shows evidence for both dominant shallow and weaker pervasive anisotropy. The correlation between delays and event depth is much weaker for the Ainapo (AN) array than for BP; however, a smaller slope is apparent. Conservative estimates of the crack densities for the BP and AN arrays are e = 12 percent and e = 6 percent, respectively.

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