The Banda Sea earthquake of 24 November 1983: evidence for intermediate depth thrust faulting in the Benioff zone |
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| Authors: | Marion O Michael-Leiba |
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| Institution: | Bureau of Mineral Resources, P.O. Box 378, Canberra, A.C.T. 2601 Australia |
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| Abstract: | On 24 November 1983, a major earthquake occurred at 180 km depth beneath the Banda Sea. In the focal mechanism solution the pressure axis is almost horizontal, (azimuth 191°, plunge 02°) and the tension axis nearly vertical (plunge 88°). A comparison with the foreshock-aftershock pattern suggests that shear failure took place within the north-north-westerly dipping Benioff zone by thrust faulting along a southerly dipping plane. The focal mechanism solution does not conform to the usual pattern of the tension or compression axis being roughly parallel to the dip of the Benioff zone. Consequently the faulting could not have been caused by down-dip tension or compression within a sinking slab. |
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