Geophysical data of field activity S-1-96-WO in Cascadia, Washington from 04/14/1996 to 06/06/1996

Title:: Geophysical data of field activity S-1-96-WO in Cascadia, Washington from 04/14/1996 to 06/06/1996
Abstract:: Chief Scientists: Mike Fisher, Ernst Flueh. Geophysical data (bottomseismometer, GPS) of field activity S-1-96-WO in Cascadia, Washington from 04/14/1996 to 06/06/1996, <http://walrus.wr.usgs.gov/infobank/s/s196wo/html/s-1-96-wo.meta.html>.
Supplemental_Information:: Equipment Used -
bottomseismometer
GPS
Notes -
SUCCESSFUL SONNE CRUISE RESULTS ENHANCED BY EARTHQUAKE

The German research vessel Sonne came into port in Astoria, Oreg., on May 22,
after completing seismic studies of earthquake hazards
posed by the subduction zone off Washington and Oregon.

Co-chief scientist Mike Fisher
(the other co-chief was Ernst Flueh of GEOMAR, Germany)
was disappointed that strong currents in the Columbia River
forced the Sonne to be pulled into the dock stern-first by a tugboat,
thus preventing a more triumphant entry.

But Mike had little else to complain about,
reporting "spectacular success" for the cruise.
Generally good weather allowed data collection
on all but 3 days of the 5-week cruise.
As Mike reported to Steve Bohlen,
"Thanks to a highly skilled and motivated German-American crew
we achieved nearly everything we had proposed to do.

We have multichannel seismic lines that show
the downgoing oceanic plate 120 km eastward from the trench.
Using these data...with detailed, wide-angle information,
I'm confident that we will make decisive statements about
the earthquake environment of the subduction zone."

Tom Parsons led an onshore crew that set up and maintained three east-west lines
of seismometers to extend the Sonne results across western Washington.
Additional data were contributed by cooperators
Anne Trehu of Oregon State University,
who ran two lines of seismometers in northern Oregon, and
Steve Malone of the University of Washington,
who maintains a permanent network of seismometers around northern Washington.

An unexpected bonus was a magnitude 5.4 earthquake
centered east of Seattle that occurred on May 2 and
was recorded by seismometers on- and offshore.
Data from the earthquake and its aftershocks
may sharpen the picture of the downgoing oceanic plate.

In addition to getting good data, the project team also had good luck
with equipment and logistics:
Out of 22 ocean-bottom seismometers (OBS's), only one was lost;
two others were snagged by fishermen and eventually returned.

At the end of the cruise,
the USGS equipment was cleared from the Sonne in less than 24 hours,
amazing the ship's captain and the co-chief scientist Flueh.
The Germans were also amazed by Dave Scholl.
As Mike reported to Steve Bohlen,
"[The Germans] knew of his world-class status as a scientist,
but they were unprepared for a 65-year-old, Herr Professor Doktor
who relishes getting his hands dirty.
Most German scientists with his credentials
pass time sipping coffee with the captain.

In contrast, Dave made every streamer and airgun party,
activities we dubbed "deck sports."
He cheerfully wrapped miles of tape around wires, tugged on airgun hoses, and
hustled everywhere to toss in his muscle....Dave definitely leads from the front."

Another part of Mike's report to Bohlen reveals
just how far-reaching were the Sonne's effects:
"Steve Lewis (ex-USGS, now SRI) said that Navy, submarine, sound arrays
near Kamchatka were picking up odd noise from near Oregon and Washington.
Steve impressed the Navy types by guessing correctly that the odd sounds
were low- frequency bursts every 20 seconds.
He explained that he knew all about the Sonne because he had friends onboard."

Now begins the task of processing and interpreting the data,
which will take a couple of years.
Eventually the results will be used by scientists, planners,
government officials, and others to assess and mitigate earthquake hazards
in densely populated areas of the Pacific Northwest.
Geologic evidence suggests that a future earthquake there
may be as large as magnitude 9.
Publications -
Flueh, E.R., Fisher, M.A., Bialas, Joerg, Childs, J.R., Klaeschen, Dirk, Kukowski, Nina, Parsons, Tom, Scholl, D.W., ten Brink, Uri, Trehu, A.M., and Vidal, Neus, 1998, New seismic images of the Cascadia subduction zone from cruise SO108 -- ORWELL, Tectonophysics, 293, 69-84. URL:
<A HREF = "<http://dx.doi.org/10.1016/S0040-1951(98>)00091-2" target = "TC"><http://dx.doi.org/10.1016/S0040-1951(98>)00091-2</A>

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11/03/2008 jpaz /infobank/s/s196wo/bath/s-1-96-wo.300_060 /infobank/programs/edit/automerge/automerge Input was... time/lat/long style, multi-record, in caps temporal-spatial data data acquisition systems 1 2 3 3456789012345678901234567890123456 time, lat, long, time(sec) to nearest nav fix, data values

Navigation Data (s-1-96-wo.060 [GPS]) YYYYMMDDHHMMSST YYYYMMDDHHMMSST 199604230030277 199604231212278 199604231230278 199604231853429 199604242017062 199604250359363 199604250415213 199604251020364 199604251053364 199604251851214 199604271500088 199604281650390 199604300237392 199605010053393 199605010101393 199605010643394 199605030100001 199605032126003 199605032141003 199605040504003 199605052315004 199605071759007 199605090838599 199605101425001 199605111926579 199605120954534 199605121904026 199605131156454 199605132127165 199605141720499 199605142319140 199605150937512 199605150946151 199605151612452 199605160110204 199605161413546 199605161656136 199605162152407 199605170006018 199605171810531 199605181426055 199605190337477 199605190730118 199605191049398 199605191551039 199605200208531 199605200216351 199605200734442 199605201712199 199605202002470 199605202114110 199605212202344 YYYYMMDDHHMMSST YYYYMMDDHHMMSST Bathymetry Data (s-1-96-wo.300_060) YYYYMMDDHHMMSST YYYYMMDDHHMMSST 199604230030277 199604231212278 199604231230278 199604231853429 199604242017062 199604250359363 199604250415213 199604251020364 199604251053364 199604251851214 199604271500088 199604281650390 199604300237392 199605010053393 199605010101393 199605010643394 199605030100001 199605032126003 199605032141003 199605040504003 199605052315004 199605071759007 199605090838599 199605101425001 199605111926579 199605120954534 199605121904026 199605131156454 199605132127165 199605141720499 199605142319140 199605150937512 199605150946151 199605151612452 199605160110204 199605161413546 199605161656136 199605162152407 199605170006018 199605171810531 199605181426055 199605190337477 199605190730118 199605191049398 199605191551039 199605200208531 199605200216351 199605200734442 199605201712199 199605202002470 199605202114110 199605212202344 YYYYMMDDHHMMSST YYYYMMDDHHMMSST Seismic Shots Data (s-1-96-wo.400_060) YYYYMMDDHHMMSST YYYYMMDDHHMMSST 199604230030277 199604231212278 199604231230278 199604231853429 199604242017062 199604250359363 199604250415213 199604251020364 199604251053364 199604251851214 199604271500088 199604281650390 199604300237392 199605010053393 199605010101393 199605010643394 199605030100001 199605032126003 199605032141003 199605040504003 199605052315004 199605071759007 199605090838599 199605101425001 199605111926579 199605120954534 199605121904026 199605131156454 199605132127165 199605141720499 199605142319140 199605150937512 199605150946151 199605151612452 199605160110204 199605161413546 199605161656136 199605162152407 199605170006018 199605171810531 199605181426055 199605190337477 199605190730118 199605191049398 199605191551039 199605200208531 199605200216351 199605200734442 199605201712199 199605202002470 199605202114110 199605212202344 YYYYMMDDHHMMSST YYYYMMDDHHMMSST

Data format:

ASCII Size: 1.4

Network links:

<http://walrus.wr.usgs.gov/infobank/s/s196wo/html/s-1-96-wo.nav.html>

Data format:

ASCII Size: 2.2

Network links:

<http://walrus.wr.usgs.gov/infobank/s/s196wo/html/s-1-96-wo.bath.html>

Data format:

ASCII Size: 1.9

Network links:

<http://walrus.wr.usgs.gov/infobank/s/s196wo/html/s-1-96-wo.seis.html>

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