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.
JASON digging the caisson into the bottom.
Seismometer hole completed.
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.
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
A general site on H2O is located at:
BIOLOGY and bottom photos can be seen at http://www.whoi.edu/science/AOPE/cofdl/stace/H2O/
You can read a paper about the Hawaii-2 Observatory seismic system
Seismic Events of Interest
These data from theshort-period geophone vertical sensor show the water gun shots as the Joides Resolution approached the site.
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
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.
for the weekly science reports from Leg 200.
FEEDBACK? Email Fred Duennebier at the University of Hawaii: firstname.lastname@example.org
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.
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.