2024-09-03T12:48:42.234

NotApplicable

2024-09-03T18:38:39.932

Vibracore

2024-09-03T21:37:20.596

NotApplicable

2024-09-04T00:00:10.254

Targeting basin sediment in the central Reloncavi Fjord, south of the Palena river outflow. This is a distinct deep part of the fjord, isolated from the inner basin by relatively higher seafloor off the Palena river. The site has been selected based on bathymetry and sub-bottom profiles, targeting a region of well-stratified undisturbed sediments approximately 500 m above (NE) of a scalloped erosional headwall on the seabed. The site shows relative compression of the stratigraphy and has been targeted to maximise the stratigraphic range. The aim is to retrieve intact sediments to determine basin sediment inputs, including from the Calbuco volcano and the other sediment sources feeding the Reloncavi fjord. Sample targets are: bottom water, push cores for seabed interface, push cores for infauna, vibrocores (x 2), scoop bags for infauna.

2024-09-05T12:16:53.201

NotApplicable

2024-09-05T14:30:06.945

Targeting sediment routes into the Ancud Gulf from the south. The seafloor is channelised with varied topography. Sediment routes are poorly constrained, but there are potential signals from theriver systems to the south (Rayas river) offshore Chaiten. This is the most distal target region, prior to subsequent dives moving southwards towards the Rayas outflow. Precise location will be determined from overnight sub-bottom profiles.

2024-09-05T20:12:25.248

NotApplicable

2024-09-05T23:12:09.393

Targeting sediment routes towards the Ancud Gulf from the south, in the prominent channel east of Isla Chulin. This channel deepens to the north with a range of erosional structures. The target site has been selected towards the eastern side of the channel, based on sub-bottom profiles, in a region of parallel bedded sediment. The target is closer to Chaiten than the previous ROV dive, potentially with a more direct sediment route for sediment outflow from the Rayas river system.

2024-09-06T18:57:29.027

NotApplicable

2024-09-06T20:49:30.468

ROV Dive #: 005 Dive Description: Targeting sediment forming the Rayas delta. Sub-bottom profiles have shown multiple packages which can be targeted on a transect across the delta margins, to reach progressively older units. This site is targeting the youngest unit visible on the profile acquired overnight. Packages are transparent and we are expecting sandier sediments than at the previous dive sites. Dive Activities/ Objectives: Once on bottom, visual transects of area to identify any local structures or seabed variation and to determine precise sediment sampling location. Confirm that just one coring location within this area, rather than two. Once location selected, Niskin bottles for bottom water (x 2) Push cores (x 3) collected for geological purposes Two further push cores (4 and 5) collected for biological/geochemical purposes. Two vibracores (duplicates) Four scoop bags (biology) Return to surface, unless it was decided to target a second nearby location within the initially examined area, to collect further vibracores. Additional Information Watch leads: Seb, Becky (rotation) Sealog: in pairs, rotating between 8 on-shift science team members Once on deck, label vibrocore tubes with core name Push cores and scoop bags then removed to sampling and bio teams ROV Vehicle Configuration Five vibrocores on rack, four with valves, one without; six push cores on front, seven scoop bags available.

2024-09-07T13:46:54.628

NotApplicable

2024-09-07T15:31:16.971

ROV Dive #: 006 Dive Description: Targeting sediment forming the Rayas delta. Sub-bottom profiles have shown multiple packages which can be targeted on a transect across the delta margins, to reach progressively older units. This site is targeting the youngest unit visible on the profile acquired overnight. Packages are transparent and we are expecting sandier sediments than at the previous dive sites. Dive Activities/ Objectives: Once on bottom, visual transects of area to identify any local structures or seabed variation and to determine precise sediment sampling location. Confirm that just one coring location within this area, rather than two. Once location selected, Niskin bottles for bottom water (x 2) Push cores (x 3) collected for geological purposes Two further push cores (4 and 5) collected for biological/geochemical purposes. Two vibracores (duplicates) Four scoop bags (biology) Return to surface, unless it was decided to target a second nearby location within the initially examined area, to collect further vibracores. Additional Information Watch leads: Seb, Becky (rotation) Sealog: in pairs, rotating between 8 on-shift science team members Once on deck, label vibrocore tubes with core name Push cores and scoop bags then removed to sampling and bio teams ROV Vehicle Configuration Five vibrocores on rack, four with valves, one without; six push cores on front, seven scoop bags available.

2024-09-07T19:18:26.037

NotApplicable

2024-09-07T21:17:34.48

Targeting basin sediment in the upper Reloncavi Fjord. This is a distinct inner basin of the fjord, fed by two rivers to the north. The site has been selected based on bathymetry and sub-bottom profiles, targeting a region of well-stratified undisturbed sediments. The aim is to retrieve intact sediments to determine basin sediment inputs, including from the Calbuco volcano and specifically the imprint of the 2015 Calbuco eruption. Sample targets are: bottom water, push cores for seabed interface, push cores for infauna, vibrocores (x 2), scoop bags for infauna.

2024-09-09T11:30:15.891

NotApplicable

2024-09-09T17:02:04.221

Targeting basin sediment in the upper Reloncavi Fjord. This is a distinct inner basin of the fjord, fed by two rivers to the north. The site has been selected based on bathymetry and sub-bottom profiles, targeting a region of well-stratified undisturbed sediments. The aim is to retrieve intact sediments to determine basin sediment inputs, including from the Calbuco volcano and specifically the imprint of the 2015 Calbuco eruption. Sample targets are: bottom water, push cores for seabed interface, push cores for infauna, vibrocores (x 2), scoop bags for infauna.

2024-09-10T11:48:01.875

NotApplicable

2024-09-10T15:04:07.064

Targeting sediment routes south of the Rayas delta and west of the Blanco/Yelcho river systems. This area shows a sharp change in backscatter with a broadly N-S boundary. To the E the seafloor is higher backscatter and less variable, while to the west the seafloor is higher backscatter with cross cutting lineations. This dive targets the easter region. It will investigate the parallel bedded stratified sediments visible in sub-bottom profiles in this area, which appear to be younger than the substrate at the prior dive site.

2024-09-10T18:44:54.268

NotApplicable

2024-09-10T20:40:50.64

Targeting sediment routes west of the Blanco/Yelcho river systems. This area is on the north side of this system and expected to show stronger influence from the Blanco sediment sources. Samples here will allow testing of sediment routes across this area, and the connection of these to dune systems that extend from this area round to the Rayas delta.

2024-09-11T14:29:13.161

NotApplicable

2024-09-11T16:43:23.311

Targeting sediment accumulation rates and sources in the basins west and south of Chaiten. This area sits within an elongate E-W basin to the far west of Chaiten, which sub-bottom profiles show to have thick accumulations of well stratified sediments. Parts show erosional features; this region has been selected as the area with the youngest accumulations. Samples here will allow testing of sediment routes across this area, and the connection of these systems to different sedimentary sources.

2024-09-12T21:15:55.374

NotApplicable

2024-09-12T22:39:31.032

Targeting the upper slope of the Blanco delta front in its central region. The site has been selected as the top of an upper transparent unit descending from the front of the Chaiten delta system. Structures suggest this material is sourced from the Blanco river, but adjacent stratigraphy may also have influence from the Yelcho river. The site has been selected to target the transparent part of the delta frontal units, aiming to use the vibracorer to extend beyond the mud that was sampled with the grab.

2024-09-13T11:11:49.029

NotApplicable

2024-09-13T13:24:44.968

Targeting the mid to lower slope of the Blanco delta front in its central region, downslope from the previous dive site and in a distinct unit (but still a transparent unit) observed in sub-bottom profiles, before a stratified sequence is entered below the delta margins (the target of ROV011). The site has been selected as the top of an lower transparent unit descending from the front of the Chaiten delta system. Structures suggest this material is sourced from the Blanco river, but adjacent stratigraphy may also have influence from the Yelcho river. The site has been selected to target the transparent part of the delta frontal unit, aiming to use the vibrocorer to extend beyond the mud that was sampled with the grab.

2024-09-13T17:34:14.781

NotApplicable

2024-09-13T20:47:11.259

Targeting the high backscatter region with dune-like beforms north of the Yelcho outflow. This is on the margin of a platform west of the Blanco outflow and north of the Yelcho outflow. It has been selected to target coarse material in this high-backscatter facies, and to understand sediment input at the south side of Chaiten bay. A transect has been suggested to target lower backscatter regions across the dune structure

2024-09-14T11:39:22.223

NotApplicable

2024-09-14T13:18:35.83

Targeting the channel N of the Yelcho delta, forming a relatively deep, narrow route for sediment to the west. The channel floor has large undulating bedforms through this region. The core site is at the westerly edge of these, before the channel opens out slightly to basins to the west. The site has been selected to recover sediment from within the channel and understand input sediments and routes on the south side of Chaiten bay, fed by the Yelcho system, and the input of the Blanco to this southward route.

2024-09-14T16:55:02.03

NotApplicable

2024-09-14T19:41:23.066

Targeting the outflow routes W of the Yelcho channel and Chaiten Bay. The previous dive site has identified sandy units in the channel with volcaniclastic input. This is the next downstream basin beyond the channel; the site is aiming to identify sediment routing into this channel and the downstream evolution of units derived from the Blanco/Yelcho systems.

2024-09-15T20:32:50.016

NotApplicable

2024-09-15T22:19:15.427

Targeting the outflow routes W of the Yelcho channel and Chaiten Bay. The previous dive site has was in a deeper basin W of Yelcho, and recovered a shallow ash-rich unit a few centimetres in thickness. This basin is further W and slightly more elevated, but shows thick sediment accumulations. The site aims to identify the extent of Chaiten deposit sedimentation via the southward routes. 236m Depth

2024-09-17T11:45:45.768

NotApplicable

2024-09-17T22:51:43.881

The site is targeting the most distal sediment pathways in the study region, in a fan at the base of the Simpson Canyon, which cuts through the continental slope to the margin of the Pacific. The area has existing mapping data on which the site has been picked, with additional SBP profiles collected overnight to pick the specific site. The fan that is deposited at the mouth of the canyon shows undulating large bedforms and the main target is a transect across this region with associated sampling.

2024-09-18T13:55:42.213

NotApplicable

2024-09-18T22:04:11.204

The site is targeting sediment sources that feed the Simpson Canyon, particularly those from the Chiloe Sea. This site has been selected in one of the subsidiary and northern channels, rather than the larger channel further south, aiming to target less mixed sediment sources. The site is a terrace that may accumulate overbank deposits. The main target is geological but it also offers an opportunity to identify biological communities in the upper parts of the Simpson Canyon and at intermediate depths between the previous ROV dives and the rest of the study area.

2024-09-19T17:50:17.822

NotApplicable

2024-09-19T19:49:30.254

The site is targeting sediment sources in the southern parts of the Corcovado Gulf, where several basins are partially connected around the east side of a platform. Sub-bottom profiles suggest complex feeder systems and distinct accumulation rates between basins. This site has been selected as a relatively more isolated and distinct system that appears to be predominantly fed from the NE. It will provide an indication of potential for accumulating eruption related deposits from the nearby volcanoes of Yanteles and Melimoyu.