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- Path: sparky!uunet!stanford.edu!morrow.stanford.edu!pangea.Stanford.EDU!andy
- From: andy@pangea.Stanford.EDU (Andy Michael USGS Guest)
- Newsgroups: ca.earthquakes
- Subject: Re: Higher quake probability in Southern California
- Date: 20 Nov 1992 20:57:25 GMT
- Organization: Stanford Univ. Earth Sciences
- Lines: 25
- Distribution: ca
- Message-ID: <1ejjflINN6rk@morrow.stanford.edu>
- NNTP-Posting-Host: pangea.stanford.edu
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-
- In article <1992Nov20.054846.19181@borland.com> pfussell@borland.com (PaulFussell) writes:
- >I'll try again--seems like I'm losing the first 7 or 8 lines of my
- >messages. I read in the paper this morning that the Landers quake
- >had increased stress on the San Andreas, and that there's a increased
- >likelihood that the 8M quake that was supposed to occur in 30 years
- >is now likely to occur in 10 years or less. Is anyone familiar with
- >the data? What's your opinion?
- It's the San Bernadino segment of the San Andreas which was given a 20%
- chance in 30 years starting in 1988 of an M7. At least one of the new
- studies says that event could happen 10 years earlier because of Landers.
- It does NOT say that it will happen within 10 years. This is based on
- comparing changes in the static stress field on the faults due to Landers
- with yearly changes due to plate motions. A lot of it is moderately
- tenuous and the authors have stated that the 10 year earlier part is the
- most tenuous and have resisted attempts to have this work result in
- changes to the probabilities that are now being revised for southern
- California. So sayeth Ruth Harris who works here and gave a seminar
- yesterday on her and Bob Simpson's paper.
-
- Personally I sort of like Richard Stead's argument that without Landers
- it would have been 10 years late because Landers just isn't that unusual.
- Quite though provoking.
-
- Andy
-