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This expedition had two main areas of operations. A set of international sites roughly 1600 miles west of Chile, and a group of sites within Chilean waters just off the west coast. This long transit allowed for a long continuous run on both the maggie and bathy.
Transit | Maggie | Bathy | Comments |
PA to CSP-2B (L1T) | Yes | Yes |
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CSP-2B to CSP-7A (L2T) | No | Yes |
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CSP-7A to CSP-1A (L3T) | No | Yes | Bad weather caused us to transit slow(~5kn) as well as overshoot site by 150 miles before we could turn around safely. |
CSP-1A to CHI-4B (L4T) | Yes | Yes | Weather caused us to take an indirect route going as far north as S42 Latitude. |
CHI-4B to ESP-1B (L5T) | No | Yes | Maggie could not be run in Chilean waters. |
Individual Measurement Systems
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WinFrog was run the entire expedition with no major issues. A few times it had to be restarted and loaded with a previously saved config file to clear communication issues with the bathy or maggie , so that data coming from those programs was properly displayed. When this issue occurred with the bathy the water depth would only be displayed in WinFrog each time the value updated in Bathy2010, but then would jump back to 0.0 in WF immediately afterwards. After loading an old config this issue did not occur again. USB to RS-232 ports had to be reset once to clear communication issues with the magnetometer in order to display mag readings in WF.
Site Fix was used at each hole that was cored to depth with no issues collecting and displaying location data or saving site reports. Two times we ran into the issue of a report being saved with no data(blank). The fix was to simply make the report again and the second one would save normally and overwrite the blank report.
Bathymetry
Bathy 2010 was run on all transits and used to obtain a PDR before drilling on each site. It was entirely run using Zoom(Bottom) mode with the processed SEGY data recording mode selected. We tested trying to use the manual SEGY start time option in order to more consistently capture accurate SEGY data but quickly realized that this method was not feasible.
Site | Prospectus Depth(m) | PDR Water Depth | Drilled Water Depth |
CSP-2B(U1539) | 4111 | 4072 | 4071 |
CSP-7A(U1540) | 3551 | 3571 | 3580 |
CSP-1A(U1541) | 3621 | 3599 | 3604 |
CHI-4B | 1111 | 1101 | 1101 |
ESP-1B | 3900 | 3867 | 3864 |
CHI-1C | 2091 |
2086 |
2090 |
Magnetometer
The magnetometer was run as much as possible depending on the sea conditions and permissions allowed. No connection issues occurred with the maggie and Sealink software. During L4T the breaker tripped on the port side winch just as we began to reel it in. However once reset it was brought in with no further issue.
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For consistency between each measurement all temperature measurements were collected using tool 1858007C.
Site/Hole | Core and corresponding measurement depth(mbsf) |
U1539A | 4H(33.1), 7H(61.6) 10H(90.1), |
U1539C | 4H(38), 13H(133), 16H(152) |
U1540A | 4H(37.5), 7H(66), 10H(93.3), 13H(131.1), 16H(150) |
U1540D | 22H(210.5)a |
U1540E | 5H(165.5), 8H(184.5) |
U1541B | 4H(45.1), 7H(64.1), 11H(102.6), 15H(138)b |
U1542A | 4H(35.6), 7H(64.4), 10H(92.6), 13H(121.1), 16H(140.8) |
U1543A | 4H(35.6), 7H(64.1), 10H(92.6), 13H(121.1), 16H(149.6), 19H(178.1), 22H(206.6) |
a. Due to a hard rock layer and high heave the tool was not able to stay in place for enough time to obtain a useful temperature curve of the formation. Cutting shoe was chipped and dinged and needed to be buffed out upon disassembly.
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