Mathematics – Logic
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1425p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Dec. 1989, p. 1425-1428.
Mathematics
Logic
15
Earthquakes, Satellite Imagery, Seismic Waves, U.S.S.R., Earth Surface, Geological Faults, Landsat Satellites
Scientific paper
Long-period and broadband body waves from 14 digital seismic stations are used to investigate the rupture process of the December 7, 1988 earthquake near Spitak, Armenia, USSR. The inversion of these data gives the following centroidal source parameters: strike 299 deg, dip 64 deg, rake 151 deg, depth 6.3 km and seismic moment 1.5 x 10 to the 19th Nm, indicating that on average the earthquake had a strike-slip mechanism with a substantial reverse component. The broadband waveforms, however, show significant complexity; they are best fit with a source model that includes three subevents, very similar in size, but with distinct focal mechanisms and locations. Rupture apparently initiated as a shallow reverse fault at a point of maximum bending on a right-lateral strike-slip fault, and then extended bilaterally, first toward the southeast and then toward the west. This interpretation agrees with the aftershock distribution and fault lineations observed on Landsat images.
Estabrook Charles H.
Nabelek John L.
Pacheco Francisco J.
Simpson D. W.
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