Hi All. This is the reply from Dr. William Steel at the University of Washington to my question as to what type of fault is associated with the latest quakes in the Lakeview area.

“Don-
The larger events located in the sequence all have focal mechanisms consistent
with a north-south trending "normal" fault. DOGAMI (Oregon Dept. of Geology and
Mineral Industries) has made a nice topo map with our improved locations for a
dozen events on it. Links to this and much more can be found at
http://www.pnsn.org/NEWS/PRESS_RELEASES/LAKEVIEW_2004.html
Enjoy!

Bill”

Faults are common in the region of south-central and southeastern Oregon, which is in the far northwest corner of the nation's Basin and Range province. The area is where the crust is pulled apart in an east-west direction in a process known as extension. This is considered to be a “normal fault.” The motion for this would be down. This would also be consistent with the Eastern California Shear Zone, but can’t say that the quakes are the results of the Eastern California Shear Zone.

The last significant quake activity in the area occurred in 1968, when more than 125 quakes -- including a magnitude 5.1 -- struck about 30 miles east of Lakeview near Adel. Take Care…Don in creepy town