The New Ireland earthquake of July 3, 1985 and associated seismicity near the Pacific Solomon Sea-Bismarck Sea triple junction

Details The New Ireland earthquake of July 3, 1985 and associated seismicity near the Pacific Solomon Sea-Bismarck Sea triple junction The New Ireland earthquake of July 3, 1985 and associated seismicity near the Pacific Solomon Sea-Bismarck Sea triple junction

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...55..144m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 55, Issue 1-2, p. 144-153.

Physics

6

Scientific paper

A temporary network of seismographs was used to record aftershocks for several days following the Ms = 7.2 earthquake of July 3, 1985 in southern New Ireland. Aftershock locations indicated a rupture ~ 50 km long in a northwest-southeast direction, possibly on the Sapom Fault. The fault plane appears to dip toward the northeast and extends from the surface to a depth of ~ 15 km. The focal mechanism determined from first motion data and long-period body wave synthetics is a thrust solution (strike = 320°, dip = 50°, slip = 80°) with a moment of 5-8 × 1026 dyn cm. The average slip was estimated to be 71-107 cm and the static stress drop 10-15 bar. Focal mechanisms for other earthquakes in the region show both strike-slip and thrust solutions. The strike-slip events reflect the currently active left-lateral transform boundary between the Bismarck Sea and Pacific plates. The thrust events are part of a zone of seismicity that dips to the northeast under New Ireland and extends to a depth of over 100 km. This seismicity is believed to be a remnant of the subduction zone that existed in the region prior to a million years ago.

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