"Sleeping residents of California's San Francisco Bay Area were rattled awake by a magnitude 4.3 earthquake in the early morning hours of September 22. The earthquake struck 1.25 miles east-southeast of Berkeley, Calif., with shaking felt as far away as Salinas, Calif., about 100 miles to the south, and Chico, Calif., about 150 miles to the north. The temblor does not pose any tsunami threat, according to the National Tsunami Warning Center."
"The earthquake occurred near the Hayward fault line, which runs from the north side of San Francisco Bay to southeast of San Jose. The largest known earthquake on record in the area of this fault was a magnitude 6.8 event in 1868. The earthquake scale is logarithmic, not linear, so the historical quake released more than 5,600 times more energy than this morning's event."
An earthquake of magnitude 4.3 struck 1.25 miles east-southeast of Berkeley at about 4.7 miles depth, shaking the San Francisco Bay Area. Shaking was reported as far south as Salinas (approximately 100 miles) and as far north as Chico (about 150 miles). The National Tsunami Warning Center reported no tsunami threat. The U.S. Geological Survey linked the event tentatively to about ten smaller quakes in the past month. The quake occurred along the Hayward fault, whose largest recorded event was magnitude 6.8 in 1868. The logarithmic scale means that the 1868 quake released over 5,600 times more energy.
Read at www.scientificamerican.com
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