|
Survey number
|
Date
|
Time (h)
|
Purpose
|
Description
|
On-bottom observations
|
Subbottom profiler
|
Comments
|
Archived video
file name
|
|
Start
|
Stop
|
Total*
|
|
1
|
22 Dec 2012
|
1853
|
2131
|
2.50
|
Locate Hole U1415A, confirm
location of bench, deploy
beacon
|
S–N survey to Hole U1415A,
survey 100 m W of hole
|
X
|
|
|
EXP 345 VIT 01
|
|
2
|
23 Dec 2012
|
0206
|
0822
|
6.25
|
Subbottom profiler survey of
bench
|
Parallel E–W transect lines planned
|
X
|
X
|
|
EXP 345 VIT 02
|
|
3
|
24 Dec 2012
|
1856
|
2057
|
2.00
|
Continue subbottom profiler
survey of bench, locate Holes
U1415D and U1415E
|
Move along W–E transect; once
pinger failed, selected site for
jet-in
|
X
|
|
Pinger failed at beginning of
survey; video starts at 2007 h |
EXP 345 VIT 03
|
|
4
|
26 Dec 2012
|
1603
|
1908
|
3.00
|
Locate Hole U1415F
|
Move from Holes U1415D and
U1415E to U1415F and U1415G;
box survey around Holes U1415F
and U1415G
|
X
|
X
|
|
EXP 345 VIT 04
|
|
5
|
27 Dec 2012
|
0739
|
0758
|
0.25
|
Locate Hole U1415H
|
Move from Hole U1415G to Hole
U1415H
|
X
|
|
|
EXP 345 VIT 05
|
|
6
|
28 Dec 2012
|
0705
|
0900
|
2.00
|
Locate Hole U1415I
|
Move from Hole U1415H to Hole
U1415I; box survey around Hole
U1415I
|
X
|
|
|
EXP 345 VIT 06
|
|
7
|
9 Jan 2013
|
1409
|
2025
|
6.25
|
Explore two potential future drill
site locations
|
First site is flat-lying shoulder ~160
m north of bench; second site is
outcrop on the bench sampled
during JC21 site survey cruise
|
X
|
X
|
Pinger failed at 1602 h, part way
through survey |
EXP 345 VIT 13
|
|
8
|
16 Jan 2013
|
1744
|
1930
|
2.25
|
Locate Hole U1415K
|
Survey 60 m wide region; box
survey around Hole U1415K
|
X
|
|
Ship moved to start of survey area
during pipe trip; started in
sedimented area found on 9 Jan
2013 survey; pinger stopped
working before survey started |
EXP 345 VIT 17
|
|
9
|
18–19 Jan
2013
|
2315
|
1230
|
1.00
|
Examine seafloor at Hole U1415K
|
Survey to find hole adjacent to
tipped free-fall funnel for re-
entry
|
X
|
|
|
EXP 345 VIT 18
|
|
10
|
20 Jan 2013
|
0423
|
0730
|
3.00
|
Locate Holes U1415L and U1415M
|
Move from Hole U1415K to Holes
U1415L and U1415M
|
X
|
|
Dropped beacon; pinger batteries
died before start of survey |
EXP 345 VIT 22
|
|
11
|
23 Jan 2013
|
0005
|
0021
|
0.25
|
Locate Hole U1415N
|
Move from Hole U1415M to Hole
U1415N
|
X
|
|
Moved 15 m west for single-bit
hole after reentry try for Hole
U1415M failed |
EXP 345 VIT 23
|
|
12
|
25 Jan 2013
|
1252
|
1536
|
2.75
|
Locate Hole U1415O
|
Move from Holes U1415M and
U1415N to Hole U1415O; 40 m
N–S transect for subbottom
profiler, box survey around Hole
U1415O
|
X
|
X
|
Ship moved from Hole U1415N to
Holes U1415F and U1415G
while pipe was being tripped to
bring close to area of interest for
Hole U1415O |
EXP 345 VIT 24
|
|
13
|
26 Jan 2013
|
0926
|
1036
|
1.00
|
Locate Hole U1415P
|
Move from Hole U1415O to Hole
U1415P, box survey around Hole
U1415P |
X
|
X
|
Pinger signal weak
|
EXP 345 VIT 25
|
|
14
|
5 Feb 2013
|
0607
|
0848
|
2.75
|
Characterize structure under Hole
U1415P |
Move 100 m north and south of
Hole
U1415P |
|
X
|
Finished survey operations
|
EXP 345 VIT 25
|
* = to nearest quarter hour. Time is local ship time (UTC – 7 h). Archived video is available from the IODP Data Librarian.