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1 km (1 miles) SSE (148°) from Quarry near Logan (Watsonville), CA (a probable quarry explosion)
-1.5 6 ounces Breaking a rock on a lab table
1.0 30 pounds Large Blast at a Construction Site
1.5 320 pounds
2.0 1 ton Large Quarry or Mine Blast
2.5 4.6 tons
3.0 29 tons
A magnitude 4.2 earthquake that could be felt throughout the Bay Area struck Thursday night, officials said.
The temblor struck 1 mile northeast of Lafayette, the United States Geological Survey Web site said. Residents said it lasted between 10 and 15 seconds.
Don´t you think that there is an increase of seismic activity in California?
The quake that rippled through the Bay Area and frayed some nerves Thursday night -- one of a bunch of recent shakes in the country's shakiest region -- doesn't portend the Big One.
So, put mass hysteria on hold, at least for a while. The 4.2 magnitude temblor, which struck at 8:40 p.m. about a mile northeast of downtown Lafayette, was felt to the coast, north past Santa Rosa and as far south as Hollister and as far east as Sacramento, say geological experts. And a few people said it put a good scare into them.