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The "earthquake swarm" shook the Long Valley Caldera area
north of Fresno, an area that has seen an increased amount of
quakes, volcanic gas emissions and other disturbances in recent
decades, the U.S. Geological Survey (USGS) said.
"These are just kind of ordinary, everyday earthquakes," said
USGS spokeswoman Leslie Gordon.
Eight of the quakes were recorded between 3.0 and 3.8 magnitude
and the rest were less serious, the agency added.
The caldera, or circular volcanic depression, was formed
following a massive eruption about 760,000 years ago and last
erupted about 50,000 years ago, the USGS said.
(Reporting by Curtis Skinner in San Francisco; Editing by Andrew
Heavens)
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