The 1993 Klamath Falls, Oregon, earthquake sequence: Source mechanisms from regional data

Details The 1993 Klamath Falls, Oregon, earthquake sequence: Source mechanisms from regional data The 1993 Klamath Falls, Oregon, earthquake sequence: Source mechanisms from regional data

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..105b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 2, p. 105-108

Mathematics

Logic

11

Earthquakes, Geological Faults, Oregon, Seismology, Shock Waves, Green'S Functions, Lakes, Moments, Seismographs, Tensors

Scientific paper

We use regional broadband seismograms to obtain seismic moment-tensor solutions of the two September 20, 1993, M(sub w) = 6, Klamath Falls, Oregon earthquakes, their foreshock and largest aftershocks (M(sub D) greater than 3.5). Several sub-groups with internally consistent solutions indicate activity on several fault segments and faults. From the estimated moment-tensors and depths of the main shocks and from the aftershock distribution we deduce that both main shocks occurred on an east-dipping normal fault, possibly related to the lake of the Woods fault system. Rotation of T-axes between the two main shocks is consistent with the two dominant trends of the aftershocks and mapped faults. We propose that a change in fault strike acted as temporary barrier separating the rupture of the main shocks. Empirical Green's function analysis shows that the first main event had a longer rupture duration (half-duration 1.7 s) than the second (1.2 s). In December, vigorous shallow activity commenced near Klamath Lake's western shore, 5-10 km east of the primary aftershock zone. It appears a M(sub W) = 5.5 aftershock occurring the day before, though within the primary aftershock zone, triggered the activity.

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