A 3.5–magnitude earthquake rattled the Lake Merritt area at 9:21 AM this morning. This followed two other quakes—both magnitude 3.7—Wednesday and Friday evenings. All three quakes occurred on essentially the same spot on the Hayward fault and at the same depth.
The quake Wednesday (December 20) occurred at 7:12 PM; last night’s quake occurred at 10:50 PM.
All three quakes were located at a depth of 6 miles and within 0.2 miles of each other. The latitude/longitude of the common epicenter was approximately 37.86N, 122.24W [map]. This spot is in north Oakland, just south of Claremont Canyon Regional Preserve and in John Garber Park—just south of Claremont Avenue, less than a mile above Ashby Avenue.
You can get information on recent Bay Area earthquakes from this page maintained by the United States Geological Survey’s Earthquake Hazards Program. If you felt any of these earthquakes, the USGS wants to hear from you. You can fill out their “Did you feel it?” questionnaire.
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Tracy’s question is, of course, high on the minds of many. This morning’s Chronicle provides a reassuring answer:
Chronicle reporter Chuck Squatriglia does, however, quote USGS seismologist David Schwartz as saying that if these had been bigger, say magnitude 5 or above, they would be of greater concern.