Dive R493 | |||||||
Dive Plan: Dive R493 is an extension of Dive R492, which was halted to recover the elevator. Again the objective is to map the 1998 lave flow from the caldera down to 45deg 52min North. | |||||||
The earthquake swarms extended south to that location but the only seafloor information is from Dive R465 ('98), which mapped a lava flow at the site of the SeaBeam anomaly at 45deg 52min North. | |||||||
Vents discovered along the way will be sampled. On Dive R492 new vents were discovered at the western edge of the contact between old and new lavas. | |||||||
ROPOS Configuration :Suction Sampler, 5 and 7 function arms with claws, cameras, and BioBox | |||||||
Note: Nav fixes not edited in the logs. All fixes were logged, regardless of accuracy. Use the dive plots to determine actual positions. | |||||||
UTC Hour | Min | Depth (m) | Sub Hdng (deg) | UTM X | UTM Y | Comments | Frmgrbs, Photos, Samples |
3 | 30 | ROPOS in water | |||||
6 | 4 | 1052 | 320 | 422617 | 5083763 | ROPOS is continuing to go down. Started down around O3:30 UTC | |
6 | 35 | 1541 | 188 | 422747 | 5084862 | Just above bottom. Lobate flows below. | |
6 | 38 | 1543 | 242 | 421952 | 5084933 | lobate new flow, but some larger lobes appear to be older. This may be a function of their rougher texture that collects sed. more readily. Hard to tell. Probably all older flow. Larger lobes are transitional to pillows with good striations on surface. | |
6 | 41 | 1544 | 247 | 422736 | 5084866 | good fix here in Older lavas. These all have brittle stars all over them, moderate sed between lobes and pillows. | |
6 | 40 | 1545 | 250 | 421952 | 5084933 | Older Lava West of contact, close-up of surface showing typical sessile biota including echinoids | R493-1 |
6 | 44 | 1543 | 83 | 422745 | 5084867 | Mix of pillows and tubular flows that appear much glassier but are also old. Rat tail fish. Photo 1 old pillows | Photo 1 |
6 | 45 | 1544 | 90 | 422777 | 5084887 | Photo 2 | |
6 | 45 | 1544 | 82 | 422777 | 5084887 | Pillow in older lava | R493-2 |
6 | 46 | 1544 | 81 | 422777 | 5084887 | Older pillows. west of contact | Pic 3 |
6 | 47 | 1543 | 78 | 422793 | 5084897 | good fix. Still in old lavas | |
6 | 48 | 1543 | 78 | 422339 | 5085300 | Brittle stars on pillows | photo 4 |
6 | 53 | 1541 | 86 | 422789 | 5084891 | continuing in mixed older pillows and tubular flows, lots of biology on surface, small amount of sed inter pillow. | Photo 5 |
6 | 59 | 1540 | 80 | 422834 | 5084901 | going east, a few bigger pillows, big fish. still in older lavas with brittle stars and sponges. Switched from local to UTC time on SIT overlay | |
7 | 2 | 1540 | 124 | 422851 | 5084883 | Contact new lava flow | R493-3 |
7 | 4 | 1540 | 150 | 422890 | 5084899 | New Lava | R493-4 |
7 | 3 | 1539 | 154 | 422890 | 5084899 | Contact between new and old. Young flow is fairly sed free very tubular and glassy, a few brittle stars, slight sed in cracks. Stopping for a sample | |
7 | 9 | 1538 | 139 | 422894 | 5084894 | Surface of young flow near the contact. Station here to get sample. | R493-5 |
7 | 12 | 1541 | 139 | 422527 | 5084408 | Right at contact, more massive old flows. | Picture 8 |
7 | 21 | 1541 | 90 | 422890 | 5084909 | Gorgonian on older flow | R493-6 |
7 | 23 | 1541 | 67 | 422883 | 5084910 | sample of old flow | R493-7 |
7 | 34 | 1541 | 74 | 422882 | 5084905 | x=42282 y=5084905 good fix. Can't sample glassy old lavas so we will take a core. Using orange core. | |
7 | 37 | 1541 | 46 | 422880 | 5084907 | grabbing at contact W5 | R493-8 |
7 | 37 | 1541 | 44 | 422880 | 5084907 | stbd rock core (orange)-getting ready | R493-9 |
7 | 39 | 1541 | 18 | 422879 | 5084904 | Taking wax core | R493-10 |
7 | 38 | 1541 | 45 | 422880 | 5084907 | Taking a rock core with orange corer at ContactW5. got a few pieces of old lava x=422880, y=5084908 | Rck_core _R493-1 |
7 | 48 | 1540 | 40 | 422880 | 5084907 | Heading east after sampling | |
7 | 49 | 1540 | 80 | 422886 | 5084910 | photo | |
7 | 50 | 1540 | 79 | 422886 | 5084910 | New lava | R493-11 |
7 | 50 | 1540 | 78 | 422896 | 5084916 | New lava - Beautiful lava drip feature | R493-12 |
7 | 50 | 1540 | 81 | 422896 | 5084916 | Drip | R493-13 |
7 | 51 | 1540 | 357 | 422782 | 5084764 | contact of new and old. sampling of same as drip sample | Photo 15 |
7 | 52 | 1540 | 353 | 424147 | 5085837 | picking up piece of rock | R493-14 |
7 | 53 | 1540 | 352 | 422904 | 5084921 | good fix while sampling | |
7 | 56 | 1540 | 17 | 422891 | 5084910 | R493-15 | |
7 | 57 | 1540 | 11 | 422891 | 5084911 | small piece of new flow put in stb. bio box x=422899 y=5084917 | Rck_R493-2 |
7 | 58 | 1540 | 1 | 422891 | 5084911 | R493-16 | |
7 | 59 | 1538 | 96 | 422891 | 5084911 | starting to head east again in young flows. | Photo 16 |
8 | 0 | 1538 | 96 | 422928 | 5084938 | some lobates with collapse, meter or so thick here | |
8 | 1 | 1538 | 93 | 422912 | 5084897 | back into smaller glassy tubes and lobes. | |
8 | 5 | 1537 | 102 | 422912 | 5084872 | Going back to the bottom - sheet flows, glassy, drained out area. | |
8 | 5 | 1540 | 101 | 422905 | 5084877 | Big crab and a big starfish | |
8 | 5 | 1540 | 101 | 422905 | 5084877 | Crab and sea star | R493-17 |
8 | 7 | 1540 | 98 | 422907 | 5084824 | Picture of young lavas, beginning to see some sediments under the lobes | Photo-18 |
8 | 8 | 1539 | 102 | 422910 | 5084813 | Something's up with our headings? We're stopping. | |
8 | 10 | 1539 | 94 | 422935 | 5084879 | Sediment in the bottom of the pits | Photo-19 |
8 | 11 | 1538 | 89 | 422976 | 5084898 | Pillow lavas and big fish | Photo-20 |
8 | 11 | 1535 | 101 | 421318 | 5086936 | Extensive drained out area | |
8 | 12 | 1536 | 99 | 421318 | 5086936 | Exploded pillow | |
8 | 12 | 1537 | 94 | 425539 | 5084820 | Picture of this exploded pillow | Photo-21 |
8 | 14 | 1536 | 97 | 422856 | 5084742 | Lobate flows. Having some trouble with navigation. Looks like there is more sediment. Collapsed area - debris on top and in hole. | |
8 | 15 | 1538 | 94 | 422856 | 5084742 | Lots of broken up lavas. Very glassy. Looks like young lava - a lot of fragmented pieces of rock. | Photo-2 |
8 | 16 | 1538 | 99 | 422988 | 5084874 | Young lobate flows, a bit of sediment. | |
8 | 18 | 1537 | 95 | 423176 | 5085015 | Heading across young lavas to the east | |
8 | 18 | 1538 | 92 | 423015 | 5084896 | x=3015 y=4896. Crab on top of collapsed area. | Photo-2 |
8 | 19 | 1538 | 106 | 423025 | 5084898 | Lots more sediment on bottom of pits. Ropy lavas. | Photo-24 |
8 | 20 | 1537 | 107 | 423019 | 5084867 | More shallow collapse. | |
8 | 20 | 1539 | 106 | 423042 | 5084882 | Chaotic jumbled folded area. Crab. Some thin plates that stand up vertical. Glassy. | Photo-25 |
8 | 21 | 1539 | 104 | 423056 | 5084871 | x=3056 y=4871 good fix on this line. Glassy flows. | |
8 | 22 | 1538 | 105 | 423068 | 5084862 | Large drained out area - flat. Down in a collapse area. Lineated lava flow. | Photo-26 |
8 | 22 | 1540 | 109 | 423059 | 5084828 | Looks like flow is to the south. Lines heading south. Big broad plain. | |
8 | 23 | 1540 | 104 | 423100 | 5084854 | Flat plain - sheet flow | R493-18 |
8 | 23 | 1540 | 106 | 423090 | 5084854 | Large flat area. First large lineated area we've seen like this. | Photo-27 |
8 | 24 | 1540 | 107 | 423099 | 5084853 | Extensive area of sheet flows. | Photo-28 |
8 | 25 | 1539 | 109 | 423107 | 5084854 | x=3114y=4855 good fix. Collapsed area. Glassy. | Photo-29 |
8 | 26 | 1538 | 111 | 423135 | 5084821 | Up on a more solid surface. Young lobate flows. | |
8 | 26 | 1538 | 110 | 423136 | 5084867 | young lobate flows | R493-19 |
8 | 26 | 1538 | 108 | 423136 | 5084867 | x=3136 y=4867 good fix. Photo of crab. Extensive pockets of sediments. Back on the roof of a pit. | Photo-30 |
8 | 27 | 1538 | 111 | 423147 | 5084867 | 3147 4867 good fix. Photo of skylight. | Photo-31 |
8 | 28 | 1537 | 115 | 422990 | 5084680 | More jumbled chaotic area. | |
8 | 29 | 1540 | 107 | 423156 | 5084856 | Glassy jumbled flow. | Photo-32 |
8 | 29 | 1541 | 107 | 423174 | 5084865 | x=3174 y=4865 good fix. | Photo-3 |
8 | 30 | 1541 | 110 | 423188 | 5084860 | Mounds of jumbled sheets. Glassy. Some sponges - very small. | Photo-34 |
8 | 31 | 1541 | 121 | 423194 | 5084854 | More mounds of jumbled lavas. Slightly deeper. | Photo-35 |
8 | 32 | 1542 | 107 | 423272 | 5084885 | Still in young jumbled lavas | Photo-36 |
8 | 33 | 1541 | 105 | 423218 | 5084860 | x=3217.5 y=4859.7 good fix. Giant pillar, wall structure, about 4 m tall. Photos 37 - 40 | Photos |
8 | 34 | 1538 | 114 | 423209 | 5084854 | Lots of collapsed areas, young lobate flows at bottom. More spires up ahead. | |
8 | 34 | 1538 | 103 | 423209 | 5084854 | Picture of lava spire. | Photo-41 |
8 | 34 | 1538 | 103 | 423209 | 5084854 | Spires | R49321 |
8 | 35 | 1537 | 110 | 423209 | 5084854 | We're in an area where the eruption may have occurred. Deepest drainout area. | Photo-42
Photo-43 |
8 | 35 | 1540 | 111 | 423218 | 5084859 | Intact structures. More pits. | Photo-44 |
8 | 36 | 1537 | 106 | 423165 | 5084764 | No sign of any venting so far. | |
8 | 36 | 1538 | 115 | 423165 | 5084764 | Jumbled sheet flow at bottom of pit area. | |
8 | 37 | 1539 | 112 | 423088 | 5084636 | More jumbled lavas. | Photo-45 |
8 | 38 | 1539 | 107 | 423284 | 5084848 | Folded back piece of lava - very shiny. | |
8 | 38 | 1539 | 106 | 423291 | 5084844 | Jumbled up crust is very thin. | |
8 | 39 | 1540 | 112 | 423293 | 5084841 | Into flat area again - lineated lavas. | |
8 | 39 | 1540 | 106 | 423059 | 5084494 | Jumbled lava. Spires. | Photo-46 |
8 | 40 | 1538 | 110 | 423313 | 5084843 | Series of intact areas with spires holding them up. Lobate flow on top. | |
8 | 41 | 1538 | 109 | 423291 | 5084792 | Lobate lavas. Apparently out of collapsed drained out area. | Photo-47 |
8 | 41 | 1538 | 108 | 423335 | 5084838 | 3335 4838 good fix. | |
0 | 0 | 0 | 0 | 0 | Lobate flows, very glassy, very little life on them. | ||
8 | 42 | 1538 | 111 | 423300 | 5084785 | Photo of young lobate flows. Big rattail fish. | Photo-48 |
8 | 43 | 1538 | 111 | 423356 | 5084839 | Shallow collapsed pits. Jumbled flow. | |
8 | 44 | 1538 | 110 | 423365 | 5084840 | A holothurian | |
8 | 44 | 1538 | 109 | 423373 | 5084839 | Lobate flows. Surfaces have small pockets of sediment, some brittle stars | Photo-49 |
8 | 45 | 1538 | 109 | 423383 | 5084838 | Tops of the lobes look glassy. | |
8 | 46 | 1538 | 108 | 425253 | 5084725 | Fragments of the glass in the pockets with sediment. | Photo-50 - 51 |
8 | 46 | 1538 | 110 | 423392 | 5084830 | Glass in pockets of lobate flow | R493-22 |
8 | 47 | 1539 | 109 | 423360 | 5084774 | Lobate flows, pockets of sediment with glass. A brittle star. | Photo-52 |
8 | 48 | 1539 | 108 | 423363 | 5084774 | Problem with the consoles. | |
8 | 49 | 1539 | 108 | 423221 | 5084598 | We've lost console link-no telemetry | |
8 | 52 | 1539 | 108 | 423386 | 5084812 | Looks like we've had some serious snap-loading on the umbilical causing a fiber to break. | |
8 | 54 | 1539 | 108 | 423536 | 5084972 | Turned everything off to try restarting the whole thing. | |
9 | 1 | 1411 | 22 | 423536 | 5084972 | Power is up again | |
9 | 5 | 1375 | 329 | 423436 | 5084849 | They think it's a surface computer glitch that caused the problem. | |
9 | 6 | 1372 | 325 | 423438 | 5084850 | The sub motor isn't starting at depth. | |
9 | 14 | 1320 | 295 | 423591 | 5084706 | Going to bring the sub up to a shallower depth (50-70 m) to see if we can turn the motor on. | |
Dive Summary: R493 was an extension of Dive R492. Collected a couple rock samples, but didn't go to any vents. ROPOS on bottom 0635 - 0848. At 0848 the sub lost telemetry due to snap-loading on the |