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- Path: sparky!uunet!paladin.american.edu!howland.reston.ans.net!spool.mu.edu!agate!pedro
- From: pedro@eerc.berkeley.edu (Peter Clark)
- Newsgroups: ca.earthquakes
- Subject: Re: Creeping Quakes?
- Date: 25 Jan 1993 23:51:07 GMT
- Organization: University of California, Berkeley
- Lines: 29
- Distribution: ca
- Message-ID: <1k1udb$cua@agate.berkeley.edu>
- References: <45096@ucbvax.BERKELEY.EDU> <51919@seismo.CSS.GOV>
- NNTP-Posting-Host: rock.eerc.berkeley.edu
-
- In article <51919@seismo.CSS.GOV> stead@skadi.CSS.GOV (Richard Stead) writes:
- > ...
- >However, if a swarm appears in a region
- >which has not had any quakes for a long time, this is cause for concern.
- >It can mean that a fault has been strained to the point where it is
- >beginning to fail after a long quiesence. With each small quake, the
- >fault grows weaker and will eventually fail completely, producing a major
- >quake.
- > ...
-
- Related to this and quite relevant to those of us in the East Bay,
- I'm somewhat curious about the recent small quakes near the San Leandro/
- Oakland border. The first one caused a bit of damage to chimneys right
- in the epicentral "neighborhood" (literally - only one street showed signs
- of damage). The next one was a week or two later and slightly smaller,
- but if I remember correctly, the weekly report said it was in almost
- the exact same location. I realize that the Hayward fault is always
- grumbling a bit, but these successive quakes in the same spot got me thinking,
- especially after someone told me that strong East Bay quakes
- have sometimes followed strong South bay quakes (i.e. Loma Prieta) rather
- closely.
-
- Is this worthy of comment, or am I just paranoid? Thanks for your opinions.
-
- Cheers,
- Peter Clark
- U.C. Berkeley Earthquake Engineering Research Center
- pedro@eerc.berkeley.edu
-
-