The source characteristics of the Klamath Falls earthquake sequence were estimated from broad-band seismograms recorded by the Berkeley Digital Seismic Network (BDSN), TERRAscope, and western United States IRIS stations. Solutions were obtained for events ranging in size from Mw3.8 to Mw6.0. An empirical Green's function invese approach was used to estimate kinematic source parameters of the two Mw6.0 mainshocks. Both events were found to have ruptured northwest on adjacent segments of the Lake of the Woods system of normal faults. The two mainshocks about where there is a pronounced 10¿ to 20¿ clockwise rotation of strike which may have initially acted as a barrier to a through-going Mw6.2 event. ¿ American Geophysical Union 1995