The April 5, 1990 Mariana Islands earthquake and subduction zone stresses

Details The April 5, 1990 Mariana Islands earthquake and subduction zone stresses The April 5, 1990 Mariana Islands earthquake and subduction zone stresses

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...72...99z&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 72, Issue 1-2, p. 99-121.

Physics

5

Scientific paper

The April 5, 1990 Mariana Islands earthquake (Mw = 7.5) involved normal faulting at shallow depth in the Pacific plate under the Mariana trench, about 200 km east of the central Mariana Islands. The earthquake is significant for its tectonic setting, focal mechanism, and large size. The event occurred in the vicinity of a proposed slab segment boundary and may in part owe its unusually large size to lateral variation in intraplate strain, as appears to be the case for other large, normal faulting events near trenches. Detailed analysis of the seismic source parameters of the earthquake and of the relationship between seismicity and tectonics in the Mariana Islands is conducted to improve our understanding of the mechanical behavior and seismotectonics in island arcs with aseismic convergence. The 1990 Mariana earthquake rupture initiated with very low levels of energy release for an interval of about 7.2 s, followed by a large, single, impulsive event with a duration of about 6 s. Body wave inversion yields a strike = 215°, dip = 49°, rake = -95°, and a moment = 1.2 × 1020 Nm with a centroid time of 11-12 s. The source mechanism is further constrained by the long-period Rayleigh and Love wave data, with inversions yielding a strike = 184 (+/- 5)°, dip = 67 (+/-)°, rake = -90 (+/- 5)°, and moment = 2.2 (+/- 0.5) × 1020 Nm. The long-period centroid depth is 23 (+/-) km, with a centroid time of 20 (+/- 3) s.

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