Open AccessBroad-band moment tensor inversion from single station, regional surface waves for the 1990, NW-Iran earthquake sequence
Author(s) -
Domenico Giardini,
L. Malagnini,
Barbara Palombo,
E. Boschi
Publication year - 1994
Publication title -
annals of geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 60
eISSN - 2037-416X
pISSN - 1593-5213
DOI - 10.4401/ag-4157
Subject(s) - geology , seismology , inversion (geology) , moment tensor , geodesy , frequency band , rayleigh wave , lithosphere , waveform , seismic moment , dispersion (optics) , moment (physics) , surface wave , tectonics , physics , telecommunications , optics , computer science , deformation (meteorology) , fault (geology) , radar , oceanography , bandwidth (computing) , classical mechanics
e present a method for the inversion of complete waveforms in the 5-30 mHz frequency band for moment tensor determination. The method is based on the calibration of phase and group velocity dispersion curves for Rayleigh and Love fundamental modes to account for heterogeneous lithospheric structure, and is applied to the analysis of single station records of the VSL MEDNET station for the 1990 NW Iran earthquake sequence (the events of June 20, 21 and 24). The revised seismic moment of the June 20, 1990 Iranian earthquake is Mo = 1.56 x 1027 dyne-cm, corresponding to Mw = 7.4. The method proves to be a very robust tool for the analysis of moderate and large earthquakes at regional distances, producing consistent moment tensor solutions trom single station inversions in narrow (2-4 mHz) and wide (up to 20 mHz) frequency bands across the whole band of interest