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Special Holes

For data from all expeditions, see the LIMS Ocean Drilling Data Overview.

Borehole observatories

Leg Site Hole Special Hole Type Location Latitude Longtitude Water Depth Total Penetration (m) Basement Penetration (m) Casing (m) Special Hole Comment
69 504 B Borehole observatory Costa Rica Rift - S flank 1 14'N 83 44'W 3460 489 1836 90/276 Wireline CORK 2001; Deepest DSDP/ODP hole; junk below 2000 mbsf; Hole 504B also visited Legs 70,83,92,111,137,140,148
70 504 B Borehole observatory Costa Rica Rift - S flank 1 14'N 83 44'W 3460 836 1836 90/276 Wireline CORK 2001; Deepest DSDP/ODP hole; junk below 2000 mbsf; Hole 504B also visited Legs 69,83,921,11,137,140,148
83 504 B Borehole observatory Costa Rica Rift - S flank 1 14'N 83 44'W 3460 1350 1836 90/276 Wireline CORK 2001; Deepest DSDP/ODP hole; junk below 2000 mbsf; Hole 504B also visited Legs 69,70,92,111,137,140,148
92 504 B Borehole observatory Costa Rica Rift - S flank 1 14'N 83 44'W 3464 1204 1836 90/276 Wireline CORK 2001; Deepest DSDP/ODP hole; junk below 2000 mbsf; Hole 504B also visited Legs 69,70,83,,111,137,140,148
111 504 B Borehole observatory Costa Rica Rift - S flank 1 14'N 83 44'W 3460 1562 1836 90/276 Wireline CORK 2001; Deepest DSDP/ODP hole; junk below 2000 mbsf; Hole 504B also visited Legs 69,70,83,92,137,140,148
136 843 B Borehole observatory SW of Oahu 19 21'N 159 6'W 4407 318   30/244 OSN Pilot Experiment 1998; now open
137 504 B   Costa Rica Rift - S flank 1 14'N 83 44'W 3460 1622 1836 90/276 Wireline CORK 2001; Deepest DSDP/ODP hole; junk below 2000 mbsf; Hole 504B also visited Legs 69,70,83,92,111,140,148
139 857 D Borehole observatory Middle Valley Juan de Fuca Ridge 48 27'N 128 43'W 2421 936 465 48/573 CORK 1991; "basement" = sill/sediment sequence.
139 858 G Borehole observatory Middle Valley Juan de Fuca Ridge 48 27'N 128 43'W 2415 433 175 25/271 CORK 1991; new CORK 1996
140 504 B Borehole observatory Costa Rica Rift - S flank 1 14'N 83 44'W 3463 2000 1836 90/276 Wireline CORK 2001; Deepest DSDP/ODP hole; junk below 2000 mbsf; Hole 504B also visited Legs 69,83,92,111,137,148
146 857 D Borehole observatory Middle Valley Juan de Fuca Ridge 48 27'N 128 43'W 2421       CORK 1991; ATTEMPTED TO REPLACE CORK .DAMAGED CORK AND NOT REPLACED
146 889 C Borehole observatory Vancouver margin 48 42'N 126 52'W 1315 384 0 52/260 CORK and 5-1/2" liner from 270 - 327 mbsf1992
146 892 B Borehole observatory Oregon margin 44 41'N 125 7'W 674 178 0 22/94 CORK and 5-1/2" liner from 93.4 - 145.6 mbsf 1992; logger removed 1995; hydrate experiment 1998
148 504 B Borehole observatory Costa Rica Rift - S flank 1 14'N 83 44'W 3463 2111 1836 90/276 Wireline CORK 2001; Deepest DSDP/ODP hole; junk below 2000 mbsf; Hole 504B also visited Legs 69,70,83,92,111,137,140
148 896 A Borehole observatory Costa Rica Rift - S flank 1 13'N 83 43'W 3448 469 297 86/191 Wireline CORK 2001
156 948 D Borehole observatory Barbados prism 15 31'N 58 44'W 4938 538 0 43/476/535 CORK 1994; logger and string removed 1995
156 949 C Borehole observatory Barbados prism 15 32'N 58 43'W 5005 464 0 46/398/465 CORK and bridge plug1994
168 1024 C Borehole observatory East Flank Juan de Fuca Ridge 47 55'N 128 45'W 2612 176 24 39/166 CORK 1996; sensor recovered 1999; new logger 2000
168 1025 C Borehole observatory East Flank Juan de Fuca Ridge 47 53'N 128 39'W 2606 147 46 40/102 CORK 1996; logger replaced 2000
168 1026 B Borehole observatory East Flank Juan de Fuca Ridge 47 46'N 127 46'W 2658 295 48 40/249 CORK 1996; biosphere experiment 1997; sensors removed 1999
168 1027 C Borehole observatory East Flank Juan de Fuca Ridge 47 45'N 127 44'W 2656 632 57 39/578 CORK 1996; sensors recovered 1999; new logger 1999
169 857 D Borehole observatory Middle Valley Juan de Fuca Ridge 48 27'N 128 43'W 2419 929     CORK 1991; "basement" = sill/sediment sequence.REMOVED DAMAGED CORK AND REPLACED 1996
169 858 G Borehole observatory Middle Valley Juan de Fuca Ridge 48 27'N 128 43'W 2415 296     CORK 1991; new CORK 1996
174 395 A Borehole observatory Mid-Atlantic Ridge - W flank 22 45'N 46 5'W 4490   572 62/112 Installation of ODP CORK instrumented with long-term data logger.10 thermistors on cable downhole; pressure gauges above and below seal.
179 1107 A Borehole observatory 90 degree E Ridge 17 1'S 88 11'E 1659 494 123 49/413 ION NERO site; seismometer planned 2004/2005
186 1150 D Borehole observatory Japan Trench 39 11'N 143 20'E 2681 1140 0 55/534/1035 W Pacific ION seismometer/strain observatory 1999; 2nd deepest ODP casing.
186 1151 B Borehole observatory Japan Trench 38 45'N 143 20'E 2182 1113 0 76/1068 W Pacific ION seismometer/strain observatory 1999; deepest ODP casing.
191 1179 E Borehole observatory NW Pacific 41 5'N 159 58'E 5566 399 28 64/393 NW Pacific ION seismic observatory 2000
195 1200 C Borehole observatory Mariana forearc 13 47'N 146 0'E 2932 140 0 24/107/203 CORK 2001
195 1201 E Borehole observatory Philippine Sea 19 18'N 135 6'E 5710 580 68 39/527 W Pacific ION seismic observatory 2001
196 808 I Borehole observatory Nankai Trough 32 21'N 134 57'E 4675 1058   157/927 Legs 131 196; ACORK 2001; top 37 m on seafloor but fully functioning; 3rd deepest ODP casing
196 1173 B Borehole observatory Nankai Trough 32 15'N 135 1'E 4791 757 26 121/728 Legs 190 196; ACORK 2001; 5th deepest ODP casing; broken-off pipe above bridge plug
200 1224 D Borehole observatory E Pacific 27 53'N 141 59'W 4967 65 37 26/58 H2O ION site seismometer planned 2003
203 1243 A Borehole observatory Eastern Equatorial Pacific 5 18'N 110 5'W 3871 212 103 48/212 E Pacific ION seismometer to be planned 2003/2004/2005?
205 1253 A Borehole observatory Costa Rica Trench 9 39'N 86 11'W 4376 600 87 44/413 CORK II 2002
205 1254 B Borehole observatory Costa Rica Trench 9 40'N 86 11'W 4176 278 0 20/199 CORK II 4-1/2" casing broke-off and junked hole.Retrieved CORK wellhead.
205 1255 A Borehole observatory Costa Rica Trench 9 39'N 86 11'W 4312 157 0 20/118 CORK II 2002
301 1026 B Borehole observatory Juan de Fuca Hydrogeology 47 46'N 127 46'W 2658       Replaced CORK installed on Leg 168.
301 1301 A Borehole observatory Juan de Fuca Hydrogeology 47 45'N 127 46'W 2656 370 108   Single level CORK II.
301 1301 B Borehole observatory Juan de Fuca Hydrogeology 47 45'N 127 46'W   583 318   Multi-level CORK II.
306 1315 A Borehole observatory North Atlantic 67 13'N 2 56'E 1272 179     CORK
327 U1362 A Borehole observatory Juan de Fuca Hydrogeology 47 46'N 127 46'W 2661 528 L-CORK RECC installed, cone base plate at 2672.0 mbrf. 16 in. shoe is ~4-6 m above basement contact
327 U1362 B Borehole observatory Juan de Fuca Hydrogeology 47 45'N 127 46'W 2661 359 L-CORK RECC
328 U1364 A Borehole observatory Cascadia 48 41.9962 N 126 52.3291 W 1318 336 Installed RECC & ACORK. Attached 20 jts of 10-3/4 csg to ACORK head. Entire length of ACORK assembly was 329.1 m. Effective depth of assembly into hole was 323.1 m. Installed packer at bottom of 10-3/4 in. csg;
336 U1382 A Borehole observatory MAR 22 45'N 46 5'W 4494 210 120 L-CORK RECC installed, cone base plate at 2672.0 mbrf. 16 in. shoe is ~4-6 m above basement contact
336 U1383 C Borehole observatory MAR 22 59'N 46 3'W 4425 332 38 Basement contact at 38 mbsf. Installed deeper depth L-CORK.
341S U1416 A Borehole observatory Cascadia Margin 48 40.1823 N 126 50.8509 W 1261 SHRIMPI
341S U1416 B Borehole observatory Cascadia Margin 48 40.2032 N 126 50.8495 W 1261 SHRIMPI
366 U1497 D Borehole observatory Mariana Convergent Margin 16 32.2548 N 147 13.2621 E 2018 120 106 Hole readed for future deployment of CORK-Lite
366 U1496 C Borehole observatory Mariana Convergent Margin 18 06.6068 N 147 06.1001 E 1243 105 105 Hole readed for future deployment of CORK-Lite
375 U1518 G Borehole observatory Pacific near New Zealand 38 51.55'S 178 53.76'E 2630 427 Attempted to set an ACORK with an HRT base in Hole U1518G but when attempting the reentry, unexpected heave caused the bit to hit the cone and displace it ~5 m. Moved location became Hole 1518G. ACORK sucessfullydrilled in and CORK-II wellhead installed into ACORK.OsmoSampler was installed into CORK-II.
375 U1519 B Borehole observatory Pacific near New Zealand 38 43.64'S 178 36.87'E 285 Drilled a 14-3/4" hole to 285.1 mbsf and free-fall deployed a guide base and FFF.ACORK sucessfully washed to depthusing the mud motor and underreamer. A FFF was deployed and landed on ACORK head. and CORK-II wellhead installed into ACORK.An instrument string landed in the CORK-II.