High Sierra Topix

I was up as I sleep weird now. 4.4. Sounded like a car driving up the road, but there were no headlights and a little jolt.

It was a 4.4 on the Hayward Fault, felt a slight movement, but what really woke me up, was my wife running in asking if I had felt it, said yes and fell back to sleep.

One mile from the epicenter, so yes, I felt it. Fortunately it was a VERY short earthquake...It's the long earthquakes that make me feel uneasy.

SSSdave wrote:Big worry would be my car in the carport has another unit above it. Would hate to find that collapsed down preventing me from driving anywhere for probably too long a time. Worse worry is that a fire could start due to ruptured gas lines thus would want to go back in then grab some important stuff to put in my Forester.

Don't forget that your garage door might not be able to open. When the electricity went out during the Tubbs fire, some died because they couldn't get the door open to get the car out.

On the gas thingy, https://www.pge.com/en_US/residential/o ... vices.page

Felt it. Woke up. My wife did not. From Napa it was just a gentle jolt.

Most certainly felt that one. Here in Castro Valley it shook well enough so that there was no doubt it was an earthquake, although it was also clear it was a relative small earthquake. As I lay bed, I estimated the magnitude based on the duration of the shaking as being about 4.5 and figured from the intensity of shaking that it was at a moderate distance (perhaps about 20 km or so) on either the Calaveras or Hayward fault. When I got up this morning and checked the USGS website and saw that it was a M4.4 on the Hayward fault near the Claremont Hotel in Berkeley. This was the 2nd earthquake we've felt here in Castro Valley in the past half year or so. I recall a closer but much smaller M2.9 on the Hayward fault in San Leandro. I felt two M6+ earthquakes while in NE Japan back in September but they were so far away you could barely tell it was an earthquake.

Note that on the USGS site you can also look at the readings from the nearest instruments and estimate how hard it shook where you were at. When you are on the page for the specific earthquake you can click on the "Shake Map". Then you zoom in and look at the results for the nearest instruments. From this, I'd guess that at my location the peak ground acceleration was about 0.04 to 0.05 g. In contrast, the one instrument in the city of Napa picked up 0.004g, the two different locations in Petaluma measured about 0.02 and 0.005 g respectively, etc.

Yeah, it woke us up here in Fremont. About 5s of light rapid shaking. Still hoping to experience a sizable one someday, I always seem to be away when the real fun happens.