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Figure 1. Map showing the initial survey plan, with OBS refraction lines (yellow), MCS reflection lines
(red), OBS locations (blue and green circles), and IODP Sites (stars). Thin red lines indicate those notcovered during MGL1004.
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Figure 2. Diagram of source and receiver geometry for MCS operations, MGL1206.
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DC
Figure 3. MCS transects collected on cruise MGL1004 and MGL1206. Heavy lines show originallyplanned transects, and gray and red lines correspond to MGL1004 and MGL1206, respectively. Starsdenote the locations of drilling sites.
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DB
@)Y1( ML O,(')-6&$ -6.( 5#..)'2L
Plan Actual
duration elapsed elapsed diff.
Task (hour) (hour) (day) duration (hour) (day) (hour) note
Guam-1 144.0 143.95 6.0 131.5 132 5.5 12.5deploy streamer 24.0 167.95 7.0 8.5 140 5.8 15.5
deploy guns 7.0 174.95 7.3 2.8 143 5.9 4.3
(MCS shooting 1A-
1) 9.8 153 6.4 -9.8 (*1)
MCS shooting 1-2 29.4 204.31 8.5 33.3 186 7.7 -4.0
MCS shooting 2-3 27.2 231.5 9.6 36.7 223 9.3 -9.5
gun maintenance 4.0 235.5 9.8 0.0 223 9.3 4.0 (*2)
MCS shooting 3-4 32.9 268.41 11.2 30.4 253 10.5 2.5
gun maintenance 4.0 272.41 11.4 2.4 255 10.6 1.6
MCS shooting 4-
D2 34.7 307.09 12.8 34.4 290 12.1 0.3
gun maintenance 4.0 311.09 13.0 2.8 293 12.2 1.2
MCS shootingD2-1 21.8 332.88 13.9 24.9 317 13.2 -3.1 (*3)
(MCS shooting 1-
1B) 12.6 330 13.8 -12.6 (*4)
retrive guns 2.0 334.88 14.0 1.2 331 13.8 0.8
retrive streamer 8.0 342.88 14.3 2.3 334 13.9 5.7
1-Honolulu 229.5 572.4 23.9 219.0 553 23.0 10.5
Transit speed: 10 knots
Shooting speed: 4.5 knots
Shooting net difference(*5): -13.8 hours
MCS gear-related operations net difference: 33.1 hours
(*1) This is an extra segment not originally planned, gained by the early completion of gear
deployment.
(*2) Chief Sci. Officer recommended to keep shooting.
(*3) includes a turn due to gun string failure.
(*4) This is another extra segment, gained by the early completion of the original shooting plan.
(*5) This does not include extra segments.
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Db
@)Y1( DL F65- &/ 7'#65( <)2,&6$-5L
Shooting waypoints
latitude longitude latitude longitude
1 33.500000 161.000000 D2 33.585700 159.043000
2 34.735000 158.800000 1A 32.952000 160.674300
3 36.150000 157.000000 1B 33.456500 162.100000
4 36.050000 160.050000
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Dh
:0%$5/5*"01 K"+" >%65%F
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VA
Figure 4. Line 1.
Figure 5. Line 2.
Figure 6. Line 3.
Figure 7. Line 4.
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VM
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65 36:63(3 6$-& -4'(( )'()5f R4)-5]2 K65(> -4( -')$56- /'&. 0#).> )$3 -4( -')$56- -& =)<)66L
8%*/'9& :('"E
Figure 8 Bathymetry map of Tamu Massif and Ori Massif from merged MGL1206 multibeam (bright colors)and satellite altimetry (faded colors) (Smith and Sandwell, 1997) data. Contours at shown at 500-m intervals.
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VD
!6*2 L0*.'(/E
Figure 9. Bathymetry map of the area southwest of Shatsky Rise covered by the transit from Guam.Bathymetry data are from MGL1206 multibeam data (bright colors) and satellite altimetry (faded colors) (Smithand Sandwell, 1997). Contours are shown at 500-m intervals.
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VV
G*=*(( L0*.'(/E
Figure 10. Bathymetry map of the area covered by the transit from Shatsky Rise to Hawaii. Bathymetry dataare from MGL1206 multibeam data (bright colors) and satellite altimetry (faded colors) (Smith and Sandwell,1997). Contours are shown at 1000-m intervals.
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VU
L*M%0F"1 B%'9E1,54"$ K"+"
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T6*L MML
Figure 11. Wiggle plot of magnetic anomalies along MGL1206 ship tracks (blue lines). Red lines indicate
where magnetic data were collected. Unfilterd data are plotted with 5-minute interval to reduce theappearance of high-frequency noise.
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Vb
A)- D'=,
LINE LENGTH(KM) LOGFGSP LOGLGSP PROCFGSP PROCLGSP FIRSTTAPE LASTTAPE FIRSTCDP* LASTCDP STARTDAY ENDDAY
MCS_1 246.1 1029 5898 1029 5892 4 11 521 39892 90 91
MCS_2 223.7 1005 5421 1005 5421 12 18 521 36316 91 93
MCS_3 269.2 1168 6498 1168 6494 19 27 521 43596 93 94
MCS_4 297.9 943 6841 916 6816 28 36 521 48188 94 95
MCS_D2 295.7 846 6689 834 6689 37 46 521 47828 96 97
Total 1332.6
*Note: The CDP at the first shot point is set to CDP 1000.
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