Map of H2O site. The star is the H2O site. The dots are repeater locations.
The dredge used to pick up the H2O cable.
Splicing the H2O cable on the Thompson.
The H2O Junction Box being lowered into the ocean.
Launching the H2O seismic package.
The package free-falls to the bottom where JASON picks it up and moves
it to the Junction Box.
JASON digging the caisson into the bottom.
The seismic package will then be lowered into the hole.
Seismometer hole completed.
Preparing to lower the seismometer into the caisson.
Lowering the H2O seismic package into the caisson.
The completed seismic hole with the seismometer installed.
Plugging the seismic system into the H2O Junction Box.
Photo taken just before last seismic shot on departure after installing H2O.
![[H2O Data Archive]](photos/h2o_tn.jpg)
Link to 24 hour data plot archive.
H2O is currently not operating. See the UPDATE page for details.
The Hawaii-2 Observatory was installed in September, 1998, on the retired Hawaii-2 coaxial telephone cable. The project is a joint effort between the
Incorporated Research Institutes for Seismology,
Woods Hole
Oceanographic Institution ,
and the
School of Ocean and Earth Sciences and Technology at the University of Hawaii.
A general site on H2O is located at:
http://www.whoi.edu/science/AOPE/DSO/H2O/
BIOLOGY and bottom photos can be seen at http://www.whoi.edu/science/AOPE/cofdl/stace/H2O/
This site provides links to information on H2O and to small segments
of data. If you would like access to all of the seismic data, it is
available at the IRIS data
center,
You can read a paper about the Hawaii-2 Observatory seismic system
at :
ftp://soest.hawaii.edu/pub/fred/
where the file: H2O_ULF_PAPER .pdf can be down-loaded. It is published
in the IEEE Journal of Ocean Engineering April, 2002 issue on ocean
observatories. A general paper on the Hawaii-2 Observatory is also published
in this issue.
Seismic Events of Interest
Approach to H2O (pdf plot)
These data from theshort-period geophone vertical sensor show the water gun shots as the Joides Resolution approached the site.
SCHEDULE (GMT)
DISCLAIMER:
The events below may or may not have happened at all or at the times specified. This is not an "official" log of cruise events.
Depart Honolulu:2200 Dec 20, 2001
Drilling at Nuuanu Slide Site: 1400 Dec 21-1900 Dec 23
Begin Reflection Profile at H2O Site: ~ 0920 Dec 26
Pass over H2O Water Gun ~1501, Dec 26
Water gun stopped: ~ 1540, Dec 26
Time (GMT)
360(Dec 26)/1745 Go on DP at H2O-5 (Drilling at H2O-5)
360/1745- Wait on weather 16.0hrs
361/0700-1630 Running-in pipe361/1730-2030 Running in pipe
361/2030-2330 Camera and 3.5KHz survey of Site H2O-5
362/0030- jet-in test to 13m (Bottom at 4977mBRF) 1.75hrs
362/0215- Retrieve VIT sled, wait-on-weather 3.0hrs 17.75hrs
362/2100 Prep for (XCB)
363/0000-1430 Coring at Hole 1224A
363/1430-1630 Coring Hole 1224B
27° 53.3695‚N 141° 58.7538‚W
363/1630-1900 Coring at hole 1224C
27° 53.3690‚N 141° 58.7571‚W
363/1900-364/0900 Wait on weather
364(Dec 30)/0900-1100 27° 53.3698‚N 141° 58.7507 jet-in
test
364/1100-2330- Pull-pipe
364/1400- 364/2330-0330 Prepare re-entry cone casing
365/0330-02/0215 Wait on weather 47.0hrs
01/2335- Re-entry cone in the water (159.5hrs on site)
01/2330- Run down the re-entry cone on the pipe 12.0hrs
02/1220- spud hole 1224-D
02/1245 - jet-in casing
02/1315- Retrieve pipe 12.25hrs**************
03/0130- Make RCB , run down pipe 15.5hrs
03/1100-05/1500 Coring hole 1224-D
03/1845- Re-enter with RCB assembly
04/0530- Recover first core 1.0hr
04/0530- Drill second core 10.75hrs
04/1710- Recover second core 1.0hr
04/1715- Drill third core 6.25hrs
05/0025- Recover third core 1.0hr
05/0030- Drill fourth core 4.5hrs
05/0555- Recover fourth core 1.0hr
05/1500-1845 Wait on weather 3.75hrs
05/0945- Drill fifth core 15.25hrs
06/0100- Recover fifth core 1.0hr
06/1000-1900 Wait on weather in hole 9.0hrs
06/1900-08/2100 r/t pipe to change bit
07/1020 -1845 pulling pipe
08/ 0100 - 0840 running in pipe, reenter 2307Z
09/0345-12/0530 - reaming out hole, prep for casing
11/1630 - reaming stops
11/2000 - pipe trip begins
11/2040 - pipe clears hole (?)
12/0340 - pipe back on ship
12/1030 -2030 running in pipe re-entry 2330Z
13/0115 - land casing
13/0520-1208 pulling pipe
13/1640 - 0005 running in pipe reentry 14/0230Z
14/0415 - wash hole
14/0315 begin hole 1224E
14/0740 - coring hard rock in hole
15/0045 - 15th core on deck
21/1609-1805 - vertical seismic profiling test
21/2130 -22/0100 - container ship passing site
22/0940 -1040 testing water gun departing site
This will be the last regular update concerned with LEG 200 of the Ocean Drilling Program
You can see the seismic data from the last 24 hours by looking in the "24-hour data plot Archive" at the top of this page.
See:
http://www-odp.tamu.edu/sciops/ssindex.html
for the weekly science reports from Leg 200.
FEEDBACK? Email Fred Duennebier at the University of Hawaii: fred@soest.hawaii.edu
Internal view of H2O seismic package.
Functional sketch of the H2O system.
About 150 earthquakes recorded by the H2O seismometer during
the first year of operation.
The motion has been rotated to the radial direction.
Dec 26 arrival of the Joides Resolution as seen on the vertical geophone. The whales seem to be interested in what's going on, as they get very noisy after the ship stops over the H2O site.
Dec 27 lowering pipe to the bottom begins at about 1000Z. Looks like the bottom was reached at 1846, but this has not been confirmed by the drill ship.
GeoZ water gun record. (click on figure to expand). This plot assums that the shooting rep rate is 10 sec, Apparently this is not quite correct, since the minimum time does notquite coincide with the maximum amplitude (or the minimum amplitude on the horizontal sensor below).
GeoX water gun record. The 2nd arrival is a converted shear wave from basement. The third arrival is the multiple shear arrival.