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Rupture dimensions of the 1998 Antarctic Earthquake from low‐frequency waves
Author(s) -
McGuire Jeffrey J.,
Zhao Li,
Jordan Thomas H.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl011186
Subject(s) - seismology , geology , amplitude , geodesy , fault plane , focal mechanism , epicenter , rayleigh wave , seismic moment , plane (geometry) , centroid , seismogram , slip (aerodynamics) , moment tensor , physics , fault (geology) , geometry , wave propagation , mathematics , optics , deformation (meteorology) , oceanography , thermodynamics
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±.1 km/s. The rupture had a characteristic length of 178±46 km in the east‐west direction and a characteristic duration of 48±2 s. 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.