"At least 13 tremors, starting around 4:30am PT (7:30am ET) and ranging from magnitude 1.0 to 3.7, were reported near The Geysers geothermal field in Northern California. The last earthquake, a small 1.1 magnitude, was detected at 5:47am PT (8:47am ET). Residents as far south as San Francisco felt shaking, including from the first quake, a 3.6 magnitude tremor. The Geysers is a large geothermal field in the Mayacamas Mountains, spanning Sonoma, Lake and Mendocino counties, which harnesses underground steam to generate electricity."
"Smaller faults beneath the geothermal site have made the area prone to frequent earthquakes, and experts say some tremors may be triggered by the region's geothermal energy operations, raising concerns about the potential for stronger shaking. Workers and nearby residents can often feel the quakes beneath their feet. Seismologists have said that these earthquakes are triggered by a combination of factors. As steam and heat are extracted from underground reservoirs, the surrounding rock contracts, creating stresses that can set off tremors."
Multiple small earthquakes struck near The Geysers geothermal field on Thanksgiving morning, with at least 13 tremors between about 4:30am and 5:47am PT ranging from magnitude 1.0 to 3.7. The initial 3.6 quake was felt as far south as San Francisco. The Geysers spans roughly 45 square miles across Sonoma, Lake and Mendocino counties and hosts 18 geothermal power plants that harness underground steam; the area features fumaroles rather than true geysers. The field lies atop a complex fault network, and smaller faults plus geothermal operations — steam extraction and reclaimed water injection — contribute to frequent, sometimes induced, seismicity and concerns about stronger shaking.
Read at Mail Online
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