Rupture Characteristics of the Deep Bolivian Earthquake of 9 June 1994 and the Mechanism of Deep-Focus Earthquakes
- 7 April 1995
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 268 (5207) , 69-73
- https://doi.org/10.1126/science.268.5207.69
Abstract
The Mw = 8.3 deep (636 kilometers) Bolivian earthquake of 9 June 1994 was the largest deep-focus earthquake ever recorded. Seismic data from permanent stations plus portable instruments in South America show that rupture occurred on a horizontal plane and extended at least 30 by 50 kilometers. Rupture proceeded at 1 to 3 kilometers per second along the down-dip azimuth of the slab and penetrated through more than a third of the slab thickness. This extent is more than three times that expected for a metastable wedge of olivine at the core of the slab, and thus appears to be incompatible with an origin by transformational faulting. These large events may instead represent slip on preserved zones of weakness established in oceanic lithosphere at the Earth's surface.Keywords
This publication has 45 references indexed in Scilit:
- Directivity analysis of the Deep Bolivian Earthquake of June 9, 1994Geophysical Research Letters, 1995
- A deep earthquake aftershock sequence and implications for the rupture mechanism of deep earthquakesNature, 1994
- The mechanism of the Deep Bolivia Earthquake of June 9, 1994Geophysical Research Letters, 1994
- Kinetics of the olivine-spinel transformation in subducting lithosphere: experimental constraints and implications for deep slab processesPhysics of the Earth and Planetary Interiors, 1994
- Mantle shear structure beneath the Americas and surrounding oceansJournal of Geophysical Research, 1994
- Acoustic emissions produced by anticrack faulting during the olivine→spinel transformationGeophysical Research Letters, 1992
- Phase transitions and mantle discontinuitiesReviews of Geophysics, 1983
- Kinetics of high-pressure phase transformations: Implications to the evolution of the olivine → spinel transition in the downgoing lithosphere and its consequences on the dynamics of the mantleTectonophysics, 1976
- Seismological evidence for a lithospheric normal faulting — the Sanriku earthquake of 1933Physics of the Earth and Planetary Interiors, 1971
- Distribution of stresses in the descending lithosphere from a global survey of focal‐mechanism solutions of mantle earthquakesReviews of Geophysics, 1971