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Fault finding

For those who say, “There is nothing new under the sun,” I say, “Ha!”

Today there was a magnitude 4.3 earthquake in the Bay Area. Guess what? Its epicenter was not on any known fault, according to the evening news! The moderate quake makes for a pretty good-sized square on the USGS map.

The location of the quake was at 37.285 deg N, 121.620 deg W, roughly 16 miles (25 km) ESE from San Jose City Hall. The quake occurred at 17:40:29 UTC (10:40 AM, PDT).

Some speculated that the quake was on a “splay fault” off the Calaveras Fault, in the Mount Hamilton range area, which is difficult to map.

No damage was reported.

-Bill at Cheshire Cat Photo™

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