Event label Optional label Method/Device Abbreviation O2A Registry URI Date/Time Latitude Longitude Elevation Date/Time end Latitude end Longitude end Elevation end Comment SO109/2-track Underway cruise track measurements CT 1996-06-06T00:00:00 48.42480 -123.38730 1996-06-25T00:00:00 46.19498 -123.86655 Victoria B.C. - Astoria SO109/2_121GTV 121GTVA Grab_BGR Video A GTVA 1999-06-22T00:00:00 44.67055 -125.10946 -627 bioherm// SO109/2_49TSP 49TSP Transponder TRANSPO 46.03545 -129.99573 -1448 North Rift Zone/deploy transponder 3/NOAA transponder 10.0 / D; responding SO109/2_50TSP 50TSP Transponder TRANSPO 46.05257 -130.01885 -1456 North Rift Zone/deploy transponder 4/NOAA transponder 10.5 / E; responding SO109/2_51TSP 51TSP Transponder TRANSPO 46.06478 -129.97207 -1493 North Rift Zone/deploy transponder 5/NOAA transponder 11.5 / G; responding SO109/2_52CTD 52CTD CTD/Rosette CTD-RO 46.03817 -130.01300 -1637 North Rift Zone/sample area of diffuse venting/12 bottles fired; background CTD values; weak methane anomaly at depth (max. 40nl/l) SO109/2_53GKG 53GKG Giant box corer GKG 46.08333 -130.16667 -2807 basin NW of Axial Smt./tracer mapping in sediments/34cm layered sediment; muddy dark brown top layer, greyish brown clay-rich layer; blue-green sandy bottom SO109/2_54CTD 54CTD CTD/Rosette CTD-RO 46.00000 -130.01667 -1544 crater rim north of CASM/tracer mapping in water column/12 bottles fired; no apparent CTD anomalies; methane anomaly below 1400m (up to 100nl/l) SO109/2_55GKG 55GKG Giant box corer GKG 45.76668 -130.31662 -2725 basin SE of Axial Smt./tracer mapping in sediments/45cm layered sediment; muddy dark brown top layer, grey-brown clay-rich layer; blue-green sandy bottom SO109/2_56EXPL 56EXPL Photo/Video PV 46.07968 -130.01138 -1780 46.04147 -130.01418 -1526 North Rift Zone/detailed zig-zag mapping of North Rift Zone/found several areas of diffuse hydrothermal fluid flow and associated fauna and bacterial mats SO109/2_57CTD 57CTD CTD/Rosette CTD-RO 46.00317 -129.93867 -2280 Helium Basin/tracer mapping in water column/12 bottles fired; background CTD values; weak methane anomaly at 1450m depth (40nl/l) SO109/2_58GKG 58GKG Giant box corer GKG 46.00350 -129.93845 -2276 Helium Basin/tracer mapping in sediments/30cm; 3cm of muddy brown sediment at the top followed by 2 discret layers of volcanic epiclastics separated by 1cm of mud SO109/2_59CTD 59CTD CTD/Rosette CTD-RO 45.98550 -130.02250 -1573 CASM/sample area of hydrothermal venting/12 bottles fired; no apparent CTD anomalies; methane anomaly below 1350m (up to 110 nl/l) SO109/2_60GTV 60GTVA Grab_BGR Video A GTVA 45.91993 -129.97233 -1549 45.92007 -129.97293 -1553 South Rift Zone/sampling of hydrothermal spire/ca. 300kg of basaltic material with some Fe-staining; pyrite and pyrrhotite observed in vesicles SO109/2_61GTV 61GTVA Grab_BGR Video A GTVA 45.99070 -130.02690 -1481 45.98942 -130.02683 -1586 CASM/sample barite spire in CASM field/approx. 300kg of very fresh basaltic material with abundant glass SO109/2_62DR 62DR Dredge DRG 46.39263 -129.48437 -2472 46.37957 -129.46185 -1903 Rogue Volcano/sample volcanic material from the NE slope of Rogue volcano/ca. 750kg of basaltic material including old pillows, younger glassy pillows and several pieces of phyric material SO109/2_63CTD 63CTD CTD/Rosette CTD-RO 45.91650 -129.91733 -1630 SE of Axial caldera/tracer mapping in water column/12 bottles fired; background CTD values; background methane values (up to 45 nl/l) SO109/2_64CTD 64CTD CTD/Rosette CTD-RO 45.93333 -129.96633 -1531 SE entrance of Axial caldera/tracer mapping in water column/12 bottles fired; background CTD values; moderate methane anomaly below 1400m (up to 80 nl/l) SO109/2_65EXPL 65EXPL Photo/Video PV 46.02177 -130.01878 -1598 46.06138 -130.00250 -1715 North Rift Zone/explore fissure at North Rift Zone/found several areas of diffuse hydrothermal fluid flow and associated fauna and bacterial mats SO109/2_66TSP 66TSP Transponder TRANSPO 46.06478 -129.97207 -1493 North Rift Zone/release transponder 5/released SO109/2_67GTV 67GTVA Grab_BGR Video A GTVA 45.98945 -130.02462 -1557 45.98923 -130.02595 -1585 CASM/sample barite spire at CASM hydrothermal field/chimney located but grab didnít close SO109/2_68TSP 68TSP Transponder TRANSPO 46.00667 -130.00733 -1297 North Rift Zone/release transponder 1/released SO109/2_69GTV 69GTVA Grab_BGR Video A GTVA 45.98907 -130.02595 -1559 45.98927 -130.02637 -1574 CASM/sample barite spire at CASM hydrothermal field/150kg of basaltic breccia with sulfide lining and anhydrite in cavities; abundant vent fauna SO109/2_70GTV 70GTVA Grab_BGR Video A GTVA 45.98940 -130.02617 -1537 45.98970 -130.02628 CASM/to 1570m (1568m)/sample barite spire at CASM hydrothermal field SO109/2_71CTD 71CTD CTD/Rosette CTD-RO 45.98350 -130.04167 -1492 NW of Axial caldera/tracer mapping in water column/12 bottles fired; moderate anomalies in transmission, potential temperature and methane (160nl/l) below 1350m SO109/2_72CTD 72CTD CTD/Rosette CTD-RO 45.93383 -130.04917 SW of Axial caldera/tracer mapping in water column/12 bottles fired; small anomalies in transmission, potential temperature and methane (125nl/l) below 1400m SO109/2_73TSP 73TSP Transponder TRANSPO 45.94153 -130.00042 -1333 ASHES/deploy transponder 6/NOAA transponder 10.0 / D; responding SO109/2_74TSP 74TSP Transponder TRANSPO 45.93355 -129.97922 -1302 ASHES/deploy transponder 7/NOAA transponder 8.5 / A; responding SO109/2_75TSP 75TSP Transponder TRANSPO 45.92492 -130.00092 -1330 ASHES/deploy transponder 8/NOAA transponder 11.5 / G; responding SO109/2_76CTD 76CTD CTD/Rosette CTD-RO 45.93367 -129.99983 -1533 ASHES/tracer mapping in water column/12 bottles fired; small anomalies in transmission and potential temperature; increase in methane below 1300m with distinct peak (140nl/l) at 1480m SO109/2_77EXPL 77EXPL Photo/Video PV 45.91050 -129.98900 -1545 South Rift Zone/detailed mapping of South Rift Zone/station aborted due to electronic failure SO109/2_78CTD 78CTD CTD/Rosette CTD-RO 45.93333 -130.01387 -1535 ASHES/transponder navigated mapping of the plume over Inferno Vent/12 bottles fired at depths below 1450m; strong temperature and transmission anomlay; methane values range from 100 to 700nl/l SO109/2_79EXPL 79EXPL Photo/Video PV 45.91093 -129.98835 -1541 45.95425 -129.98745 -1510 South Rift Zone/map diffuse flow along South Rift Zone with SUAVE scanner mounted on EXPLOS/found several areas of diffuse hydrothermal fluid flow and associated fauna and bacterial mats SO109/2_80CTD 80CTD CTD/Rosette CTD-RO 45.96950 -130.01583 -1560 inside Axial caldera/sample inside Axial caldera/12 bottles fired; small anomalies in transmission, potential temperature and methane (135nl/l) below 1350m SO109/2_81GTV 81GTVA Grab_BGR Video A GTVA 45.93353 -130.01367 -1527 45.93393 -130.03127 -1533 ASHES vent field/sample base of Virgin Mound/ca. 100kg of massive sulfides (pyrite-marcasite-sphalerite-chalcopyrite) and abundant vent fauna at new chimney, Virgin vent not found. SO109/2_82EXPL 82EXPL Photo/Video PV 45.91962 -130.00492 -1521 45.94500 -130.02142 -1560 ASHES/reconaissence mapping east of ASHES vent field with SUAVE CTD mounted on EXPLOS/found several areas of diffuse hydrothermal fluid flow and associated fauna and bacterial mats SO109/2_83CTD 83CTD CTD/Rosette CTD-RO 45.93268 -129.98223 -1512 Axial caldera/transponder navigated plume mapping north of Axial Garden/12 bottles fired; moderate anomalies in transmission and potential temperature; methane anomaly below 1400m with peak at 1500-1520m (max. 330nl/l CH4) SO109/2_84EXPL 84EXPL Photo/Video PV 46.28568 -129.71577 -2200 46.30903 -129.70715 -2297 CoAxial segment Floc site/detailed mapping along the main eruptive fissure up to the HDV site with SUAVE scanner mounted on EXPLOS/found several areas of diffuse hydrothermal fluid flow and associated fauna and bacterial mats SO109/2_85GTV 85GTVA Grab_BGR Video A GTVA 45.98922 -130.02598 -1557 45.98933 -130.02597 -1560 CASM/grab barite spire at CASM site/ca. 300kg of very fresh glassy basalt SO109/2_86GTV 86GTVA Grab_BGR Video A GTVA 45.98890 -130.02670 -1560 45.98970 -130.02617 -1570 CASM/sample altered rock and talus at base of spire at CASM site/ca. 250kg of very fresh glassy basalt with few very small barite pieces SO109/2_87CTD 87CTD CTD/Rosette CTD-RO 45.96683 -129.98333 -1499 east of Axial caldera/tracer mapping in water column/12 bottles fired; moderate anomalies in transmission and potential temperature; methane anomaly below 1300m with peak at 1350m and decrease to ca. 100nl/l further below SO109/2_88CTD 88CTD CTD/Rosette CTD-RO 45.95833 -130.04195 -1437 west of Axial caldera/tracer mapping in water column/12 bottles fired; moderate anomalies in transmission and potential temperature; methane anomaly below 1300m (up to 110nl/l CH4) SO109/2_89GTV 89GTVA Grab_BGR Video A GTVA 45.98887 -130.02572 -1566 CASM/sample CASM barite spire/ca. 100kg of massive barite with some vent fauna and 500kg of basalt with indication of low-temperature hydrothermal activity SO109/2_90GTV 90GTVA Grab_BGR Video A GTVA 45.98960 -130.02600 CASM// SO109/2_91CTD 91CTD CTD/Rosette CTD-RO 45.93387 -130.01412 -1531 ASHES vent field/transponder navigated plume mapping of ASHES hydrothermal field/12 bottles fired, anomalies in transmission and potential temperature; up to 200nl/l methane found SO109/2_92TSP 92TSP Transponder TRANSPO 46.01860 -130.03220 -1398 North Rift Zone/release transponder 2/released SO109/2_93TSP 93TSP Transponder TRANSPO 46.03545 -129.99573 -1448 North Rift Zone/release transponder 3/released SO109/2_94TSP 94TSP Transponder TRANSPO 46.05257 -130.01885 -1456 North Rift Zone/release transponder 4/released SO109/2_95EXT 95EXT Extensometer EXT 46.01890 -130.01410 North Rift Zone// SO109/2_96CTD 96CTD CTD/Rosette CTD-RO 45.90000 -130.09167 -1951 west of Axial caldera/tracer mapping in water column/12 bottles fired, background transmission and potential temperature; methane values at depth are generally below 20nl/l with a small peak at 1450m SO109/2_97GTV 97GTVA Grab_BGR Video A GTVA 46.30882 -129.70750 CoAxial segment Floc site// SO109/2_98CTD 98CTD CTD/Rosette CTD-RO 46.30853 -129.70785 -2247 CoAxial segment Floc site/tracer mapping in water column/12 bottles fired, small anomalies in transmission and potential temperature; methane values below 25nl/l with small peak at 1700m SO109/2_99GTV 99GTVA Grab_BGR Video A GTVA 46.16200 -129.92067 -1842 North Rift Zone/sample youngest flows at this segment of the ridge/single fresh pillow, ca. 300 kg SO109/2_100EXPL 100EXPL Photo/Video PV 46.16200 -129.92067 -1842 South Rift Zone/explore South Rift Zone for hydrothermal activity around main fissure using SUAVE on EXPLOS in low-sensitivity mode/aborted, transponder (8.5 kHz) was accidently shut off during station TSP 92-94 SO109/2_101TSP 101TSP Transponder TRANSPO 45.93185 -129.97903 -1306 ASHES vent field/transponder release and deployment/transponder released (8.5 kHz) and deployed (9.5 kHz) SO109/2_102CTD 102CTD CTD/Rosette CTD-RO 45.66695 -129.78342 -2538 East of Juan de Fuca ridge/tracer mapping in water column, background station/12 bottles fired, background values for transmission, potential temperature and methane (<10nl/l) Cascadia Margin SO109/2_103CTD 103CTD CTD/Rosette CTD-RO 44.64950 -125.10000 -654 bioherm/tracer mapping in water column/12 bottles fired, no transmisson and potential temperature anomalies; two distinct methane peaks at 500m (660nl/l) and 580m (500nl/l) SO109/2_104TSP 104TSP Transponder TRANSPO 44.66627 -125.09962 -502 bioherm/deploy Sonartech transponder (11.5 kHz)/deployed, no differential GPS during deployment SO109/2_105TSP 105TSP Transponder TRANSPO 44.67762 -125.12192 -598 bioherm/deploy Sonartech transponder (11.5 kHz)/deployed, no differential GPS during deployment SO109/2_106TSP 106TSP Transponder TRANSPO 44.67885 -125.08728 -572 bioherm/deploy Sonartech transponder (11.5 kHz)/deployed, no differential GPS during deployment SO109/2_107TSP 107TSP Transponder TRANSPO 44.65837 -125.08453 -541 bioherm/deploy Sonartech transponder (11.5 kHz)/deployed, no differential GPS during deployment SO109/2_108CTD 108CTD CTD/Rosette CTD-RO 44.67200 -125.09550 -601 bioherm/tracer mapping in water column/12 bottles fired, strong methane peak below 580m (450nl/l CH4) SO109/2_109GTV 109GTVA Grab_BGR Video A GTVA 44.67200 -125.09550 bioherm//position uncertain SO109/2_110GTV 110GTVA Grab_BGR Video A GTVA 44.66583 -125.09652 bioherm// SO109/2_111CTD 111CTD CTD/Rosette CTD-RO 44.68958 -125.09592 -714 bioherm/tracer mapping in water column/12 bottles fired, moderate methane anomaly of 250nl/l CH4 at 650m depth SO109/2_112CTD 112CTD CTD/Rosette CTD-RO 44.65833 -125.07500 -827 bioherm/tracer mapping in water column/12 bottles fired, background values for transmission, potential temperature; methane values show no distinct peak but are generally around 100nl/l SO109/2_113EXPL 113EXPL Photo/Video PV 44.65710 -125.09603 bioherm// SO109/2_47TSP 47TSP Transponder TRANSPO 46.00672 -130.00733 -1297 North Rift Zone/deploy transponder 1/NOAA transponder 8.5 / A; responding SO109/2_115GTV 115GTVA Grab_BGR Video A GTVA 44.67297 -125.10183 bioherm// SO109/2_116GTV 116GTVA Grab_BGR Video A GTVA 44.67235 -125.10195 bioherm// SO109/2_117CTD 117CTD CTD/Rosette CTD-RO 44.67083 -125.09000 -600 bioherm/tow-jo in SSW direction/12 bottles fired, methane values range from 35 to 100 nl/l SO109/2_118CTD 118CTD CTD/Rosette CTD-RO 44.66883 -125.10900 -608 bioherm/tracer mapping in water column/12 bottles fired, strong methane anomaly between 490m and 540m (up to 4200 nl/l. Second smaller anomaly beneath 580m depth (1000 nl/l) SO109/2_119GTV 119GTVA Grab_BGR Video A GTVA 44.67372 -125.10110 bioherm// SO109/2_120CTD 120CTD CTD/Rosette CTD-RO 44.67417 -125.10800 -609 bioherm/tracer mapping in water column tow-yo/12 bottles fired, few samples with elevated methane but bottle 7 showed record 4700 nl/l CH4. SO109/2_122CTD 122CTD CTD/Rosette CTD-RO 44.66900 -125.10917 -606 bioherm/tracer mapping in water column/12 bottles fired, small methane anomaly between 480m and 520m (900 nl/l) SO109/2_114CTD 114CTD CTD/Rosette CTD-RO 44.65867 -125.09950 -614 bioherm/tracer mapping in water column/12 bottles fired, strong methane anomaly below 520m with peak of ca. 1300nl/l CH4 at 540m depth SO109/2_48TSP 48TSP Transponder TRANSPO 46.01860 -130.03220 -1398 North Rift Zone/deploy transponder 2/NOAA transponder 9.5 / C; responding