Thursday, June 16, 2005

California shaking

I heard third hand, from a geologist friend of mine that todays earthquake - is the third medium quake in a row, within an interval of a few days, which occured directly on the main San Andreas fault.

May not mean anything, could even be relieving stress build-up (though I'd like to hear that from USGS or Caltech people), or it could be not so good - always waiting for the Big One...

I miss California.


Anonymous Anonymous said...

I'm not sure that is right, Steinn -- the quake on Sunday was on the San Jacinto branch, not the main San Andreas, and the one Wednesday was in northern CA, and definitely not on the SA fault. So of the three I think only today's was close to the fault and the San Diego paper is reporting that it wasn't a SA strike-slip earthquake but a thrust quake on a splinter fault.

Or maybe you are right, and the big one will arrive while I'm at Disneyland next week. --steve

12:37 AM  
Blogger Steinn said...

I thought the wednesday one was where the SA goes offshore for a bit.
Ah well, never trust geologists, and don't believe what you read on the web...

11:22 AM  
Blogger yami mcmoots said...

Yesterday's quake was about half thrust, half strike-slip, as it happens, and not on the San Andreas proper. The USGS is putting Wednesday's quake in the middle of the Gorda plate. Sunday's quake was definitely on the San Jacinto Fault. It's the same tectonics at the bottom of it all, more or less, but your friend got the details wrong on all counts I'm afraid.

Word on the street is that this week's clustering is just a coincedence.

3:51 PM  
Blogger Steinn said...

Nah, I got the details all wrong.
Chinese whispers gets that way, even in science. I'd even looked at the USGS maps and saw that the quakes were on branch faults.

Checked in with my friend, who really does know what he is on about. He is seriously concerned, in that he feels the pattern is consistent with possible slip on the main San Andreas fault.

But I don't want to make that case, not being a geologist and all that. Just wanted to clarify where I was coming from.
And clustering is usually random. Except when in hindsight it isn't.

And, I no longer live in California. Though Hershey is no match to the Magic Kingdom I fear. Enjoy Steve!

10:58 PM  

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