Physics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3401k&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 22, p. 3401-3404
Physics
6
Seismology: Earthquake Dynamics And Mechanics, Seismology: Earthquake Parameters, Information Related To Geographic Region: Antarctica
Scientific paper
The 1998 Antarctic intraplate earthquake (Mw8.1) has a significant non-double-couple component in the moment tensor solution as determined from long-period surface waves. In the teleseismic P and SH wave-forms, there are two distinctive wave packets that can be explained by multiple strike-slip subevents. We propose a composite rupture model comprising two different episodes: two predominant clusters of en echelon strike-slip segments (~16×1020Nm) and normal faulting with a long duration of approximately 100 s (~4×1020Nm). This model agrees with observations of both teleseismic body waves and long-period surface waves, including the large non-double-couple component. The normal faulting with as long a duration as the main strike-slip rupture might be secondarily induced by the en echelon segments of strike-slip faulting.
Kikuchi Masayuki
Kuge Keiko
Yamanaka Yoshiko
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