Included in the recent volcanic-related seismicity across the U.S. was a small
Ml 1.2 near the Three Sisters, Oregon. PNSN gives the parameters as:

O: 5NOV2001 3:16:06 44.2N 121.9W ML=1.2 PNSN NW of Three Sisters, Oregon

Only two other earthquakes have ever been located within 30
km of this epicenter. The first was on June 9, 1994 and the other on
Aug. 21, 2001, both with Ml 1.9.

Don of Hollister and Petra have posted interesting material on this board on
the bulge which has been detected in recent years near the Three Sisters.
This bulge may now be producing microearthquakes.

• Northwest U.S. earthquakes