Several magnitude 2 and 3 earthquakes rumbled through the San Francisco Bay Area on Friday. It’s the latest seismic activity to add to a swarm of 60 earthquakes greater than magnitude 1 to hit the Danville area in the past week. The largest in the sequence, a magnitude 3.6 earthquake, came at 12:19 p.m. Friday. The U.S. Geological Survey received reports from more than 1,000 people who said they felt the quake, extending from the East Bay and into San Francisco. The quake was quite shallow, less than a third of a mile under the surface of the earth. A magnitude 2.8 aftershock was felt two minutes later.

Earthquake swarm rattles San Francisco Bay area, Earthquake swarm rattles San Francisco Bay area february 23 2018, earthquake swarm san francisco bay area february 2018
Earthquake swarm rattles San Francisco Bay area on February 23, 2018. Epicenter of the strongest M3.6 earthquake. via USGS

San Francisco has been shaken by a series of small earthquakes over 24 hours in California – the US state where a ‘Big One’ could happen at any moment. Friday’s seismic sequence began at 2:32 a.m., with a magnitude 2.7 temblor, followed by a magnitude 2.8 earthquake less than an hour later. A magnitude 3.3 earthquake hit at 5:28 a.m. The BART train service delayed trains after the magnitude 3 earthquakes Friday as a safety precaution.

Earthquake swarms like the one that began on Feb. 16 in the Danville area have been common over the past few decades, occurring in 1970, 1976, 1990, 2002, 2003 and 2015. They occur in the San Ramon Valley corridor along Interstate 680 between Walnut Creek and the Dublin and Pleasanton areas, said U.S. Geological Survey research geologist Belle Philibosian.

The Calaveras fault runs right along the San Ramon Valley. In the Danville area, the fault zone transitions and steps over to the Concord fault, which continues north into Concord, Philibosian said. There is a complex zone of small faults in this transition area.

While the San Andreas and Hayward faults are well known to many in the Bay Area for their seismic risk, the Calaveras and Concord faults also pose a substantial risk. The Calaveras fault is as long as the Hayward fault, for instance, and can produce a magnitude 7 earthquake, Philibosian said.

We should expect it to have large earthquakes in the future, such as a magnitude 6 or 7. Farther south, parts of the Hayward and Calaveras faults merge south of San Jose.

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via LA Times

6 COMMENTS

  1. I’m still waiting for Edgar Cayce’s prediction to come true ; that part of CA would break off and fall into the ocean in the month of May, hard to know what YEAR though.

  2. […] Several magnitude 2 and 3 earthquakes rumbled through the San Francisco Bay Area on Friday. It’s the latest seismic activity to add to a swarm of 60 earthquakes greater than magnitude 1 to hit the Danville area in the past week. We expect it to have large earthquakes in the future, such as a magnitude 6 or 7. As reported at Strange Sounds: Swarm of 16 earthquakes rattles San Francisco Bay Area after series of 60 earthquakes hit the Danvil…… […]

  3. I have checked this swarm of small earthquakes around Diablo Rd. The foot hills near Mt Diablo (Mt Devil) was the location of this swarm. Mt Diablo has a huge deep quarry that is the construction site and also entrance to their huge secret underground bases. Mt Diablo State Park and some other parks, some kind of open space area are all surface facilities of their underground bases. If you do image search for Mt Diablo State Park, you can see a massive fort kind of structure at the summit (a part of their underground base). It looks really militaristic structure. I mentioned many times that most of the parks are related to military and underground bases.

    This swarm of small earthquakes have concentrated in small area where there is open hill area with several huge mansions with a swimming pool in the east side of Vista Grande Elementary School. That can suggest the clean up in and around the secret underground base in that area had been done by Galactic Federation of Light. Yes, that area is a colony of reptilians. Especially those who are living in those mansions are all privileged reptilians.

    I used to have a friend living around there, and he took me to Mt Diablo with strange rocks. He also took me to some kind of underground facility (near San Francisco) where I cannot find on Google Map. It was a really creepy place. He might have been a reptilian, but he was a nice guy.

  4. […] third of a mile under the surface of the earth. A magnitude 2.8 aftershock was felt two minutes later. San Francisco has been shaken by a series of small earthquakes over 24 hours in California – the US state where a ‘Big One’ could happen at any moment. Friday’s seismic sequence began at 2:32 a.m., with a magnitude 2.7 temblor, followed by a magnitude 2.8 earthquake less than an hour later. A magnitude 3.3 earthquake hit at 5:28 a.m. The BART train service delayed trains after the magnitude 3 earthquakes Friday as a safety precaution. READ MORE […]

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