Rupture dimensions of the 1998 Antarctic earthquake from low-frequency waves

Details Rupture dimensions of the 1998 Antarctic earthquake from low-frequency waves Rupture dimensions of the 1998 Antarctic earthquake from low-frequency waves

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2305m&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 15, p. 2305-2308

Physics

2

Seismology: Earthquake Dynamics And Mechanics, Seismology: Surface Waves And Free Oscillations

Scientific paper

We inverted frequency dependent phase and amplitude measurements from 1st orbit Rayleigh waves at global stations for the 1st and 2nd degree polynomial moments of the stress-glut rate tensor. The higher moments of the slip-rate distribution determine the fault plane and approximate rupture dimensions. The results show strong rupture propagation to the west with an average velocity of the instantaneous centroid of 3.6+/-.1km/s. The rupture had a characteristic length of 178+/-46km in the east-west direction and a characteristic duration of 48+/-2s. The results are consistent with unilateral rupture on the east-west fault plane of the focal mechanism and rule out significant rupture on the north-south nodal plane.

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