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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: Quake felt in Menlo Park 1pm Sunday
- Date: 22 Dec 1992 01:34:46 GMT
- Organization: Stanford Univ. Earth Sciences
- Lines: 26
- Distribution: ca
- Message-ID: <1h5rbmINNng1@morrow.stanford.edu>
- References: <1992Dec21.010651.2986@netcom.com> <1h5g6fINNj9b@agate.berkeley.edu> <1h5m1kINN5rk@gap.caltech.edu>
- NNTP-Posting-Host: pangea.stanford.edu
-
- In article <1h5m1kINN5rk@gap.caltech.edu> hough@seismo.gps.caltech.edu (Susan Hough) writes:
- >In article <1h5g6fINNj9b@agate.berkeley.edu> greg@perry.berkeley.edu (Greg Anderson) writes:
- >>
- >>OK, here's the info from us here at UCB and from the USGS in Menlo Park.
- >>UCB:
- >>Location: 1 mile NNE of San Leandro (San Leandro Hills)
- >> 37 degrees, 44.7 min North
- >> 122 degrees, 08.6 min West
- >> depth = 2 miles
- >>Magnitude: Mw 3.6
- >
- >Thanks Greg, for posting all of this. My question regarding this event
- >has to do with the tv shots of cracked chimneys & such--all of that for
- >a M3.6-ish event? Just a function of the relatively shallow depth?
- >Or extreme site effects near the source? Or extreme poor construction
- >near the source?
- I vote for the shallow depth as the primary cause of damage. My
- understanding is that all of the 12 chimneys that needed to be taken
- down were on the same street, so site effects could also be involved.
- And if they were on the same street they could also have been built at
- a similar time, with similar methods, perhaps even by the same person.
- But clearly these chimneys have survived previous quakes as this is a
- moderately active spot on the Hayward, so the shallow depth for such a
- *large* quake may be the key.
-
- Andy
-