Earthquake!

January 28, 2002

[Floratina]

The P-wave is more discernable at distance. Gets a chance to outrun shear, no?

[capitan_refugio]

The P-wave alerted me. I was on the computer and hear the livingroom window shake. Then the s-waves came rolling through with a thud. All I had time to say was, "Earthquake" and the kids came rolling out of their rooms!

[stayout]

Here are the seismographs:

[Redcloak]

4.2 doesn't rate anything more than an excuse to post on FR! These...

Another...

These are just fun quakes.

[breakem]

I was just acknowledging you were close. You must be on another fault line. I have friends in Ojai, Camarillo, and Santa Clarita.

[calljack]

6 total so far. I'd rather have a bunch of small ones vs one big one.

[breakem]

All roads go through Corona. Or at least all cars.

[ZGuy]

There's number 6. You feel that one?

[Dengar01]

Thanks for the headsup I'm in Illinois and my grandparents live in Simi Valley, I freaked out since they are in their 80's I called them and they are fine.

Dengar01 in Earthquakefree Chicagoland

[Redcloak]

Yes. These tend to give us ~1 sec. of separation at our house. Also, the P-waves can be quite energetic. (Northridge's P-wave lifted me out of bed!) It has a very distinctive feel to it.

[capitan_refugio]

True, the farther away you are from the hypocenter (or epicenter, if you prefer), the longer the time between the first p-wave arrivals and the first s-wave arrivals. The problem is that the p-wave (essentially a compressional sound wave) dies out as a function of distance from the origin.

[RedBloodedAmerican]

Sheese. the one aftershock in Alameda I recall that stood me up off the sofa sounded like a train coming down the rood. You could see the wave pass by.

When I was a kid, I thought grownups kidded about Californicate slipping into the Ocean. They weren't kidding!

[Redcloak]

Heard it more than felt it. ~3?

[calljack]

11 total so far USGS

[ZGuy]

There has been one reported injury so far. Some guy's wife got scratched up by her cat who freaked!

[Cinnamon Girl]

Is that true about little ones being good because they release tension and prevent big ones? I hope so.

[calljack]

Yes it is true that the stress on that particular fault line is less after a series of small quakes. If that creates more stress on a different fault somewhere else is something to think about.

[Dengar01]

Well I've never been in an earthquake luckily, So I have to sit here in Illinois worrying about my grandparents in Simi Valley. I'm watching Fox 11 LA on DirecTV and watching the Earthquake report, it's 12:33AM here in Chicago, but it looks like it is minor.

[dpwiener]

4.2 doesn't rate anything more than an excuse to post on FR! These...
Another...
These are just fun quakes.

Normally a 4.2 would barely be worth reporting. Being practically on top of it, I could really feel it. But it's still basically just a fun quake, especially when you have something like the Northridge quake to compare it with.

[Redcloak]

During Northridge I was working at Litton in Woodland Hills. We were in our building a few days later cleaning up. An aftershock hit as I was talking to my supervisor. By then, I was at the point where I was ignoring them. My supervisor stopped talking mid-sentence like he was in shock, which seemed a little odd. He should have been used to them too. But from where he was standing, he could see all the way down one of the building's long hallways. He was distracted by the wave traveling down the hall.