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

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  • We use regional broadband seismograms to obtain seismic moment-tensor solutions of the two September 20, 1993, Mw =6, Klamath Falls, Oregon earthquakes, their foreshock and largest aftershocks (MD>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 Mw=5.5 aftershock occurring the day before, though within the primary aftershock zone, triggered the activity.
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  • Braunmiller, J., Nábělek, J., & Leitner, B. (1995, January 15). The 1993 Klamath Falls, Oregon, earthquake sequence: Source mechanisms from regional data. Geophysical Research Letters, 22(2), 105-108.
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  • This research was supported by the U.S. Geological Survey grant 1434-93-G-2326. Operation of broadband stations in Oregon was supported in part by grants from the Oregon Department of Geology and Mineral Industries and the National Science Foundation (EAR-9207181).
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