The Gilbert Islands (Republic of Kiribati) earthquake swarm of 1981-1983

Details The Gilbert Islands (Republic of Kiribati) earthquake swarm of 1981-1983 The Gilbert Islands (Republic of Kiribati) earthquake swarm of 1981-1983

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...33..284l&link_type=abstract

Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 33, Dec. 1983, p. 284-303.

Physics

18

Earthquakes, Pacific Islands, Seismographs, Azimuth, Bathymeters, Love Waves, Rayleigh Waves

Scientific paper

Attention is given to the major swarm of intraplate earthquakes at the southeastern end of the Gilbert Islands Chain, which lasted from December, 1981 to March, 1983. Four events in the sequence were large enough to determine focal mechanisms teleseismically, using body and surface wave analyses. These events were found to have a range of mechanisms, from predominant thrust with a significant oblique component to a purely strike-slip type. The compression axes are consistent for all four events, with a horizontal orientation which is perpendicular to the direction of plate motion. While some characteristics of the swarm suggest a magmatic origin, the nature of the focal mechanisms, the location of the swarm, and the large accumulated moment release of the sequence favor a tectonic origin.

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