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#Earthquake. One of the work phone's apps alerted before the shaking. I'll check #USGS in a couple of minutes.
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Okay. #USGS says the #earthquake was M 4.4, 1km WNW of Lytle Creek, CA.
It started with a low rumbling sound. Then the MyShake app alerted: "Earthquake! Take cover. Drop, cover, hold!" Then came the shaking, which lasted less than 30 seconds. It was not intense.
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Update 1: M 4.1.
Update 2: M 4.2. Pager green, with estimated 65% chance of <1 fatality and <$1M economic damage.
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Anyway, Lytle Creek is not very far away from the San Andreas Fault.
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Obviously, USGS will revise its estimates once more data is gathered. That includes citizen science from the "Did You Feel It?" part of the https://earthquake.usgs.gov/ site.
So far, no pager estimate. And the epicenter is too inland for any #tsunami risk, so there shouldn't be anything about it on https://tsunami.gov/