Date: Thu, 22 Aug 1996 12:30:01 -0700
From: kris@odf.UCSD.EDU (Kristin Sanborn)
To: cchadwel@ucsd.edu
Subject: Equipment Request for New Horizon 9608
Cc: kris@odf.UCSD.EDU, woodys@odf.UCSD.EDU, erika@odf.UCSD.EDU,
joanne@odf.UCSD.EDU, john@odf.UCSD.EDU, leo@odf.UCSD.EDU,
doug@odf.UCSD.EDU, dlong@odf.UCSD.EDU, ron@odf.UCSD.EDU,
jswift@odf.UCSD.EDU, fspiess@ucsd.edu, restech@sdsioa.ucsd.edu,
shipsked@ucsd.edu
X-Sun-Charset: US-ASCII
************************** ODF *****************************
************************** EQUIPMENT REQUEST *****************************
--------------
PI/REQUESTOR: Dr. C. David Chadwell EXPEDITION NAME: 9608NH.chadwell
DEPT: Marine Physical Laboratory 0205 PHONE: (619) 534-2663
Fax: (619) 534-6849
INDEX:ODF Use STS1165(Chadwell)
Business Office to Recharge: MPLFS17
E-MAIL: cchadwel@ucsd.edu
VESSEL: NEW HORIZON TIC: John Boaz (Staging only)
DATES: 31 August to 26 September 1996
PORTS: San Diego to Astoria
Returns to San Diego 1 October 1996
__________________________________________________________________________
PERSONNEL REQUIRED: No: ** MT/SRA: ET: DATA/PROG:
__________________________________________________________________________
Casts:
Equipment Required:
Please cc Speiss and have the Niskins, messengers, spare parts and salt bottles
readied by the marine techs.
2 1.7 liter Niskin Bottles
36 Salinity sample bottles
2 Messengers
Niskin Bottle spare parts
They plan to have the salinity analyzed at ODF facility.
__________________________________________________________________________
Additional Information:
Excerpt from Message from Dr. Chadwell:
> We begin loading the New Horizon this coming Tuesday, Aug. 27 and would
> like to have the equipment available at that time. We return to San
> Diego on Sept. 30. and will then return the equipment.
Shipping Details (Approx.Dates,etc.):
GROUND:
AIR:
All equipment is to be returned clean and assembled.
Overboard equipment must be rinsed with fresh water and dried.
__________________________________________________________________________
Taken by:email,21 August 1996 Request by:Kristin Sanborn, 22 August 1996
Copies to: Sutherland/Wilson/Digre(Administration), Boaz/Lopez(Marine Tech),
Masten(Chemistry), Long(Logistics),
Patrick(Thermometry, CTD Calibs),
Swift(Science), Requestor/PI
Dr. C. David Chadwell, (cchadwel@ucsd.edu)
Dr. Fred Spiess, fspiess@ucsd.edu
Resident Technicians (restech@sdsioa.ucsd.edu,
Ship Scheduling (shipsked@ucsd.edu)
ODF participants: None
** Notify Kristin Sanborn or John Boaz of additions or changes.
internet: ksanborn@ucsd.edu Telephone: (619) 534-1903
jboaz@ucsd.edu (619) 534-1905
*********************************
Our plan for '96 is to work duing September on seafloor strain and
elevation measurements in the vicinity of our existing precision
transponders and gravity benchmarks at the Cleft Segment. These should
produce 18 near-bottom baselines (3 from USGS gear) ranging in length from
0.75 to 8 km in length, 3 globally tied seafloor reference points, a 7 or 8
point cross-strike elevation profile and absolute gravity measurements to
provide a long term reference for the elevation work.
Elevation:
We have 3 benchmarks in a line across strike as listed under Zumberge in
"Cleft Moorings" on your Cleft home page. We plan adding 4 or 5 more to
close up the spacing and extend the profile length to about 10 km. We will
occupy at least one of these with the absolute gravimeter as a long term
reference point and make relative elevation (pressure) measurements at all
7 or 8 sites. This will give us a good profile to monitor vertical
deformation.
Strain:
1. We will carry out near bottom range and environmental parameter
measurements using the precision transponders already on site. This will
give us 15 repeated baselines ranging in length from 1.5 to 8 km.
2. We will do GPS-Acoustic position measurements at the centers of the two
3-tranponder clusters close to the Cleft ridge crest - one triangle on the
Pacific plate and one on the JdF using the same transponders as in item 1.
This will give the motion of the edges of these plates in global
coordinates. Pacific Geoscience Centre (PGC) will operate the on-shore
reference station as in the past.
3. We will also make a GPS-Acoustic position determination at our JdF
reference station ("Tully") just seaward of the Cascadia Subduction Zone,
at 48¡10'N, 127¡10'W.
4. USGS representatives will come with us on the second part of our 2-leg
expedition and we will assist them in obtaining a data dump from their
three instruments on the Cleft crest (sites as listed in your "Cleft
Moorings" tabulation). These will provide continuously recorded data over 3
baselines of 0.75 to 1 km.
5. On the first leg, as part of Larry Clark's instrument development
program, we will make a trial installation of Zumberge's 500 m long,
continuously recording fiber optic strain meter across the cleft near the
USGS transponders.
New Horizon will be the ship used for this work, with the following
schedule (subject to change as realities emerge):
29 Aug., am, sail from San Diego
2 Sept., am arrive Newport, OR, embark Hildebrand/Spiess/Zumberge groups
2 Sept., pm sail for Cleft.
3 Sept., pm arrive Cleft, install transponder navigation net centered on
USGS Tripods at 44¡40'N 130¡22'W and seafloor pressure reference recorder,
commence gravity measurement and bench mark installation. Carry out
installation of Zumberge fiber optic strain recording meter. Make GPS
acoustic measurements while various equipment items are being prepared for
launch.
8 Sept., pm sail for Newport
9 Sept., pm quick tansfer of Zumberge ashore and USGS reps on board. start
return to Cleft.
10 Sept., pm commence near bottom range and bench mark pressure
measurements. Continue GPS-Acoustic measurements. Recover USGS data.
19 Sept., am depart Cleft for Tully.
20 Sept,. am arrive Tully site, commence near bottom and GPS-Acoustic
observations.
23 Sept., am depart Tully site for Astoria
24 Sept., am arrive Astoria, disembark scientific party.
24 Sept., pm depart Astoria
28 Sept., pm arrive San Diego.