3.4-magnitude quake strikes San Ramon as series of temblors continues

USGS: 45 earthquakes around Valley in past week, 15 at 2.0-magnitude or above

A 3.4-magnitude earthquake, now the largest temblor in a recent swarm of small shakers around the East Bay, was recorded Thursday morning near San Ramon, according to the U.S. Geological Survey.

The earthquake, which was reported at 6:10 a.m., was first classified as having a 3.2-magnitude, but it has since been upgraded, USGS officials said.

People felt shaking as far north as Vallejo and as far south as Sunnyvale, according to the USGS.

Then between 9:30 and 10:30 a.m. Thursday, there were five earthquakes of imperceptible magnitude that the USGS reported around San Ramon.

Within the past week, the USGS has reported 45 total earthquakes in San Ramon or nearby. Fifteen of those earthquakes were reported above a magnitude of 2.0.

The swarm's second-largest reported earthquake, after Thursday morning's temblor, was a 3.1-magnitude earthquake reported early Wednesday morning in San Ramon, according to the USGS.

— Bay City News Service

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6 people like this
Posted by sponge bob roundpants
a resident of Danville
on Oct 15, 2015 at 2:07 pm

5 earthquakes of imperceptible magnitude were reported around San Ramon? If they had imperceptible magnitude, how could they have been perceived?
Where is Julia from Alamo when we need her...

3 people like this
Posted by Member
a resident of Danville
on Oct 15, 2015 at 3:45 pm

Imperceptible to humans that is, not to machines that read the intensity, depth, duration, etc.

According to the US Geological survey, people do not normally perceive earthquakes with magnitudes lower than 3.0. By definition the Modified Mercalli scale rates earthquakes that happen but cannot be felt by humans at intensity 1.

2 people like this
Posted by redacted
a resident of Danville
on Oct 16, 2015 at 12:37 pm

You missed the point. The article addressed whether people felt it and then went on to say that they were present but imperceptible. It never clarified that machines could read it, but you ignored that (you're due for a reading comprehension brush-up). But you're really good with Google, genius. Thanks for the cut and paste.

Like this comment
Posted by David
a resident of Danville
on Oct 19, 2015 at 11:26 am

There have been and continue to be frequent earthquakes. Sorry if you need more specific language to help you understand that sponge bob.

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