Mechanism and tectonic implications of the great Banda Sea earthquake of November 4, 1963

Details Mechanism and tectonic implications of the great Banda Sea earthquake of November 4, 1963 Mechanism and tectonic implications of the great Banda Sea earthquake of November 4, 1963

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...25..129o&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 25, Issue 2, p. 129-139.

Physics

14

Scientific paper

The Banda Sea earthquake of November 4, 1963 (h = 100 km, mB = 7.8) is probably one of the largest intermediate-depth shocks to have occurred worldwide this century. The mechanism of this earthquake is studied in detail on the basis of P-wave first motion, surface wave and aftershock data. From the analysis of long-period multiple surface waves, a seismic moment of 3.1 × 1028 dyn-cm is obtained, which is the largest reported so far for any intermediate or deep focus shock. This value, together with the estimated fault area of 90 × 70 km2, gives an average dislocation of 7.0 m and a stress drop of 120 bar. This event represents an oblique thrust movement on a plane with dip direction N170°E, dip 48° and rake 52°. A geometrical consideration for the fault plane and the configuration of the inclined seismic zone beneath the Banda arc suggests, almost definitely, that the large-scale faulting took place within the subducted plate and offset it. Further repetition of such large-scale faulting might eventually break the subducted plate. The 1963 Banda Sea earthquake thus represents a seismological manifestation of the large-scale deformation of the subducted plate in the mantle.

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