Y'all, this is unreal. I've now felt my third earthquake since we moved here in June, 2006. That's one more time than I've heard it thunder.
What I felt came from the apartment's hallway, rattling something--I don't know what, maybe a window. All I know is, I heard the rattle, felt the floor shake underneath my feet. (I was seated at my computer desk, facing towards the hallway.) Just that quickly, the living room windows rattled loudly, and it was over. Instantly my feet and legs began to tingle, with a sort of coming awake feeling, but at the same time a sort of jumpy/nervous intensity. My upper arms felt much the same. My heart rate and breathing changed a bit, too, about the time I thought, "Oh, was that an earthquake?" I clicked on Favorites and went to the "Did You Feel It?" link I stored after the first one I felt. I typed answers to the questions, all the while wondering if it was really one, hoping it wasn't the start of something big. Next I grabbed the remote control, flipping channels until the local ABC affiliate confirmed it for me. Then I found this information you see below; 56 miles from Portland and I felt it that emphatically.
Information from http://earthquake.usgs.gov
2007 September 24 06:20:54 UTC
Monday, September 24, 2007 at 06:20:54 UTC
Sunday, September 23, 2007 at 11:20:54 PM at epicenter
Location 45.107°N, 123.044°W
Depth 29.5 km (18.3 miles) set by location program
9 km (6 miles) NW (312°) from Brooks, OR
11 km (7 miles) NNW (330°) from Labish Village, OR
12 km (7 miles) N (351°) from Keizer, OR
20 km (12 miles) N (356°) from Salem, OR
56 km (35 miles) SW (214°) from Portland, OR
Location Uncertainty horizontal +/- 0.1 km (0.1 miles); depth fixed by location program
Parameters Nst= 41, Nph= 41, Dmin=24 km, Rmss=0.27 sec, Gp=115°,
M-type=duration magnitude (Md), Version=0
Pacific Northwest Seismograph Network
Event ID uw09240620
Another Web site is reporting it as a 3.8 magnitude. All I know is it lasted longer and felt stronger than the first two I've experienced.
Ah, well, off to bed I go. A glass of milk and some biofeedback relaxation and I should be asleep in no time.