Moment tensor analysis of the central Italy earthquake sequence of September-October 1997

Details Moment tensor analysis of the central Italy earthquake sequence of September-October 1997 Moment tensor analysis of the central Italy earthquake sequence of September-October 1997

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1971e&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 11, p. 1971-1974

Physics

65

Seismology: Earthquake Parameters, Seismology: Seismicity And Seismotectonics, Tectonophysics: Continental Tectonics-Extensional, Tectonophysics: Dynamics, Seismotectonics

Scientific paper

The larger earthquakes in the Umbria-Marche (central Italy) seismic sequence of September-October 1997 are analyzed using long-period seismograms from the Mediterranean seismographic network (MEDNET) and additional data from the global seismographic network (GSN). We modify the Harvard centroid-moment tensor (CMT) algorithm to allow moment tensor inversion of long-period waveforms, primarily Rayleigh and Love waves, for small earthquakes at local to regional distances (Δ<15°). For the three largest earthquakes (MW>5.5) in the sequence, moment tensors have previously been determined using teleseismic waveforms and standard methods of analysis; our results agree well with those of earlier studies. We determine additional moment tensors for the largest foreshock and 10 aftershocks with MW>4.2. The earthquakes are characterized by normal faulting mechanisms, with a NE-SW tension axis, and the presumed fault plane dips towards the SW. Only one of the fourteen events studied has a different faulting geometry, indicating instead right-lateral strike-slip faulting on a plane oriented approximately E-W, or left-lateral faulting on a plane oriented N-S. The September 26 mainshock (09:40 UT) accounts for only approximately ~50% of the total moment release in the sequence.

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