The mechanism of the deep Bolivia earthquake of June 9, 1994

Details The mechanism of the deep Bolivia earthquake of June 9, 1994 The mechanism of the deep Bolivia earthquake of June 9, 1994

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2341k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 22, p. 2341-2344

Physics

46

Bolivia, Crustal Fractures, Earthquakes, Remote Sensing, Seismology, Shock Waves, Rupturing, Seismographs, Shear Stress, Shock Wave Propagation

Scientific paper

We analyzed the IRIS broad-band seismograms for the June 9, 1994, Bolivia earthquake, the largest deep-focus earthquake ever recorded. We inverted the record sections with a duration of 330 sec which include P, pP and sP phases, and obtained a dip-slip mechanism: (dip(delta), rake(lambda), strike(phi)) = (13 deg, -4 deg, 1 deg) or (89 deg, -103 deg, 95 deg), with a scalar moment of Mo = 2.9 x 10(exp 21) Nm (Mw = 8.2). This mechanism is similar to that obtained from long-period (175 to 250 sec) Rayleigh and Love waves: (delta, lambda, phi) = (83 deg, -100 deg, 90 deg); Mo = 3.0 x 10(exp 21) Nm (Mw = 8.3). The main rupture was preceded by about 10 sec by a cluster of smaller events with a total moment of 1.2 x 10(exp 20) Nm = (Mw = 7.3). The main rupture starts at about 20 km east or northeast of the initial break, and propagates horizontally in the east to northeast direction. The source duration is 40 sec, and the rupture dimension is about 40 km. If a fault area of 40x40 sq km is assumed, the stress drop is 110 MPa. An inversion of body waves (P, pP, and sP) with 6 basis moment tensors yielded a best-fit solution with a 10% implosive component. This result is of marginal significance and its confirmation would require more detailed information on the strucutures near the source region, pP bounce points and stations. The observed amplitude of the radial mode, sub 0(exp S)sub 0, (1226 sec) is consistent with a double couple model with less than 2% isotropic component.

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