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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: Parkfield
- Date: 23 Dec 1992 23:43:20 GMT
- Organization: Stanford Univ. Earth Sciences
- Lines: 82
- Distribution: ca
- Message-ID: <1hatioINN90o@morrow.stanford.edu>
- References: <1h83q2INNk49@morrow.stanford.edu> <1992Dec23.192337.11061@netcom.com>
- NNTP-Posting-Host: pangea.stanford.edu
-
- In article <1992Dec23.192337.11061@netcom.com> alden@netcom.com (Andrew L. Alden) writes:
- >andy@pangea.Stanford.EDU (Andy Michael USGS Guest) writes:
- semantic arguments deleted.
-
- >: No one ever suggested that the Parkfield experiment was a test of the
- >: characteristic earthquake hypothesis. The instrumentation at Parkfield
- >: is there to record details of the preparation period before an
- >: earthquake, the earthquake itself, and the time period afterwards in
- >: great detail.
- >All the public knew was that the government (NEPEC) had forecast a quake
- >before 1993, and the USGS would set up a monitoring and warning system
- >for our benefit. That forecast was absolutely based on the 22-year
- >repetition model, and the factors you cite--assessing precursors,
- >rupture dynamics etc.--are consequential, not constitutive.
-
- Given the filter between us and the public this may very well be both
- the way the public sees it and not true. The warning system is quite
- clearly considered a secondary part of the experiment in the documents
- that describe it.
-
- "The primary goal of the Parkfield prediction experiment is a detailed
- understanding of the geologic processes that precede the anticipated
- earthquake."
-
- "A secondary goal of the Parkfield experiment is for the USGS to issue a
- short-term warning of the anticipated earthquake."
-
- Both from Bakun, 1988, Earthquakes and Volcanoes, v. 20, page 42.
- 1988 may seem late, but these passages were written about two years
- earlier. This issue took a long time to get published.
-
- After all it would be rather foolish to make issuing a short term
- warning the primary goal of your experiment when you don't even know
- that such warnings are theoretically possible. However, both the alert
- scheme and the long term prediction seem to be more exciting to the
- news media. The most exciting science to come out of the experiment
- uniformly doesn't make the news, even when we try to push it.
-
- >The forecast, based on that model, drove the whole enterprise.
-
- In reality there was a move towards having a prototype intensive
- monitoring experiment before the Bakun and Lindh model for Parkfield was
- proposed. Thus, it really didn't drive the whole enterprise. It
- certainly made it more fundable, but it wasn't the only factor.
-
- >I may have posed my question too provocatively for Andy, who is
- >certainly correct. I don't mean to impugn Bakun, Lindh, or McEvilly in
- >the slightest. I (and Andy, I hope) come down on the "ignorantly
- >simple" end--knowing that in science, "ignorant" is not a pejorative
- >term. For funding purposes, the test question had this advantage: it's
- >as easy to understand as betting on a coin coming up "heads" when it's
- >done so six times in a row already. This is easy to sell! I'm glad
- >Andy can attest to people's probity. But now that we know that simple
- >recurrence is too simple a model, we need to guard against the tendency
- >to sound-bite the next model we use to justify projects like Parkfield.
- >I think with Parkfield the danger is past, since its benefits, in
- >addition to the (in my opinion) sterile scientific model it tested, are
- >so obvious.
-
- I might prefer the word "optimistic" to ignorant. But I think we have
- gotten to the point of semantics. I do find such questions provocative
- because some journalists, perhaps weaned on Watergate, are always looking
- for real scandals as oppossed to sterile scientific debates. I've even
- been asked if the reasons for differences between USGS and Berekely
- magnitudes result from political differences between the groups!
-
- Sound-biting is a definite problem, but again a media driven one.
- Scientists will stoop to giving soundbites, but usually because the
- choice is between getting no coverage (which sounds like an egotistical
- reason) and therefore communicating nothing to the public (which sounds
- like a more altruistic one). I do agree that the coverage of this has
- been over-simplified and that there are large differences between how
- the scientific community and the public view this experiment. Solving
- this is a much larger problem than Parkfield, but an extremely important
- one if the public is going to understand and play a role in controlling
- the science that the government funds. Perhaps one important
- addition would be a good historic study of the project. One is under
- way, but may have started too late. Another is focussing more on the
- way large collaborations work rather than the specific science of the
- Parkfield experiment.
-
- Andy
-