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  • 1
    In: Marine and petroleum geology, Amsterdam [u.a.] : Elsevier Science, 1984, 28(2011), Seite 1915-1931, 0264-8172
    In: volume:28
    In: year:2011
    In: pages:1915-1931
    Description / Table of Contents: Highly concentrated gas hydrate deposits are likely to be associated with geological features that promote increased fluid flux through the gas hydrate stability zone (GHSZ). We conduct conventional seismic processing techniques and full-waveform inversion methods on a multi-channel seismic line that was acquired over a 125 km transect of the southern Hikurangi Margin off the eastern coast of New Zealand’s North Island. Initial processing, employed with an emphasis on preservation of true amplitude information, was used to identify three sites where structures and stratal fabrics likely encourage focused fluid flow into and through the GHSZ. At two of the sites, Western Porangahau Trough and Eastern Porangahau Ridge, sub-vertical blanking zones occur in regions of intensely deformed sedimentary layering. It is interpreted that increased fluid flow occurs in these regions and that fluids may dissipate upwards and away from the deformed zone along layers that trend towards the seafloor. At Eastern Porangahau Ridge we also observe a coherent bottom simulating reflection (BSR) that increases markedly in intensity with proximity to the centre of the anticlinal ridge. 1D full-waveform inversions conducted at eight points along the BSR reveal much more pronounced low-velocity zones near the centre of the ridge, indicating a local increase in the flux of gas-charged fluids into the anticline. At another anticline, Western Porangahau Ridge, a dipping high-amplitude feature extends from the BSR upwards towards the seafloor within the regional GHSZ. 1D full-waveform inversions at this site reveal that the dipping feature is characterised by a high-velocity zone overlying a low-velocity zone, which we interpret as gas hydrates overlying free gas. These results support a previous interpretation that this high-amplitude feature represents a local “up-warping” of the base of hydrate stability in response to advective heat flow from upward migrating fluids. These three sites provide examples of geological frameworks that encourage prolific localised fluid flow into the hydrate system where it is likely that gas-charged fluids are converting to highly concentrated hydrate deposits
    Type of Medium: Online Resource
    ISSN: 0264-8172
    Language: English
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  • 2
    Publication Date: 2022-10-01
    Description: Volcanic island sector collapses have the potential to trigger devastating tsunamis and volcanic eruptions that threaten coastal communities and infrastructure. Considered one of the most hazardous volcano‐tectonic regions in the world, the Christiana‐Santorini‐Kolumbo Volcanic Field (CSKVF) lies in the South Aegean Sea in an active rift zone. Previous studies identified an enigmatic voluminous mass‐transport deposit west and east of Santorini emplaced during the early evolution of the edifice. However, the distribution and volume as well as the nature and emplacement dynamics of this deposit remained unknown up to now. In this study, we use an extensive dataset of high‐resolution seismic profiles to unravel the distribution and internal architecture of this deposit. We show that it is located in all basins surrounding Santorini and has a bulk volume of up to 125 km3, thus representing the largest known volcanic island mass‐transport deposit in the entire Mediterranean Sea. We propose that the deposit is the result of a complex geohazard cascade that was initiated by an intensive rift pulse. This rifting event triggered a series of smaller precursory mass‐transport events before large‐scale sector collapses occurred on the northeastern flank of the extinct Christiana Volcano and on the southeastern flank of the nascent Santorini. This was followed by the emplacement of large‐scale secondary sediment failures on the slopes of Santorini, which transitioned into debris and turbidity flows that traveled far into the neighboring rift basins. Following this cascade, a distinct change in the volcanic behaviour of the CSKVF occurred, suggesting a close relationship between crustal extension, mass transport and volcanism. Cascading geohazards seem to be more common in the evolution of marine volcanic systems than previously appreciated. Wider awareness and a better understanding of cascading effects are crucial for more holistic hazard assessments.
    Description: Schematic Reconstruction of the Santorini Mass‐Transport Cascade (SMTC): After a phase of volcanic quiescence (A), a rift pulse (B) triggered precursory mass‐wasting events (C), large‐scale sector collapses (D) and secondary sediment failures (E), which culminated in a change in the volcanic behaviour of the system (F).
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Keywords: ddc:551.21
    Language: English
    Type: doc-type:article
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  • 3
    Publication Date: 2024-07-19
    Description: This dataset includes multi-channel seismic reflection data from three surveys: https://doi.pangaea.de/10.1594/PANGAEA.925803. Post-stack time migrated seismic sections that were collected in 2018, during Research Voyage TAN1808 aboard RV Tangaroa. Multi-channel seismic reflection data from the APB13 survey, collected by Anadarko Petroleum Company, in 2013. We have re-processed data from Line APB13-25, and have displayed industry processing of Line APB13-32. Multi-channel seismic reflection data from Voyage SO214 aboard RV Sonne in 2011 This datasets also includes bathymetry data, seafloor backscatter data and water column backscatter data. These data were all collected in 2018 during Research Voyage TAN1808 aboard RV Tangaroa: https://doi.pangaea.de/10.1594/PANGAEA.925804 This dataset also includes gridded horizons generated from seismic interpretation: https://doi.pangaea.de/10.1594/PANGAEA.925896
    Keywords: capillary pressure; gas chimney; gas hydrate; Hikurangi Margin; hydraulic fracturing; mass transport deposit; seal
    Type: dataset bundled publication
    Format: application/zip, 3 datasets
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  • 4
    Publication Date: 2024-07-19
    Description: This dataset includes seismic reflection data, sediment core line scanner images, and logging data from the region of the Tuaheni Landslide Complex, east of New Zealand's North Island on the Hikurangi margin. The seismic reflection data were collected in 2014 aboard RV Tangaroa (TAN1404) using GEOMAR's P-Cable system. The line scanner images and logging data were generated from sediment core recovered using gravity cores and MeBo200 drilling during Voyage SO247 aboard RV Sonne. The datasets have been used in a core-log-seismic integration study of the Tuaheni Landslide Complex.
    Keywords: linescanner images; MeBo200; Multi-sensor core logger; New Zealand; P-Cable; SCHLIP3D; seismic reflection; Tuaheni Landslide Complex; Understanding slow-slipping submarine landslides: 3D seismic investigations of the Tuaheni landslide complex
    Type: dataset bundled publication
    Format: application/zip, 10 datasets
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  • 5
    Publication Date: 2024-07-19
    Description: The southern Tuaheni Landslide Complex (TLC) at the Hikurangi subduction margin displays distinctive morphological features along its distribution over the Tuaheni slope offshore Gisborne, New Zealand. The datasets provide geophysical (MSCL) and geochemical (XRF) core logs from a gravity core transect that systematically samples surficial sediments from the source area to the toe of this landslide complex.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: dataset publication series
    Format: application/zip, 8 datasets
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  • 6
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    PANGAEA
    In:  Supplement to: Pecher, Ingo A; Villinger, Heinrich; Kaul, Norbert; Crutchley, Gareth J; Mountjoy, Joshu J; Huhn, Katrin; Kukowski, Nina; Henrys, Stuart A; Rose, Paula S; Coffin, R B (2017): A Fluid Pulse on the Hikurangi Subduction Margin: Evidence From a Heat Flux Transect Across the Upper Limit of Gas Hydrate Stability. Geophysical Research Letters, 44(24), 12,385-12,395, https://doi.org/10.1002/2017GL076368
    Publication Date: 2024-07-19
    Description: A transect of seafloor heat probe measurements on the Hikurangi Margin shows a significant increase of thermal gradients upslope of the pinchout of the base of gas hydrate stability. We attribute these anomalously high thermal gradients to a fluid pulse leading to advective heat flow while endothermic cooling from gas hydrate dissociation may arrest temperature gradients in the hydrate stability field. Double-bottom simulating reflections in the study area are likely to be caused by uplift based on gas hydrate phase boundary considerations. Previous studies predict a seamount on the subducting Pacific Plate to cause significant overpressure beneath our study area, which may be the source of the fluid pulse. We suggest this seamount may also cause the inferred uplift. Transient expulsion of warm fluids may lead to gas hydrate dissociation with potential implications for seafloor stability.
    Type: dataset publication series
    Format: application/zip, 15 datasets
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  • 7
    Publication Date: 2024-07-19
    Description: Multibeam bathymetry raw data using the ship's own Kongsberg EM 122 multibeam echosounder was not continuously recorded during RV SONNE cruise SO247. Data was recorded on 25 days between 2016-03-27 and 2016-04-25. This dataset contains a survey east of New Zealand (North Island) covering mostly the continental slope. The approximate average depth of the entire dataset is around 1800m. The data are archived at the Federal Maritime and Hydrographic Agency of Germany (Bundesamt für Seeschifffahrt und Hydrographie, BSH) and provided to PANGAEA database for data curation and publication. Ancillary sound velocity profiles (SVP) files from the cruise are archived at the BSH and added to this dataset. However, also data analysis of the multibeam raw data revealed that SVP has been changed during the survey. This publication is conducted within the efforts of the German Marine Research Alliance in the core area "Data management and Digitalization" (Deutsche Allianz Meeresforschung, DAM). Data are unprocessed and therefore contains incorrect depth measurements (artifacts) without further processing. Note that refraction errors can be expected due to the lack of proper SVP. Overall, it appears that the data quality is rather good since the gridded hillshade data showed relatively few obstacles. Data can be processed e.g. with the open source software package MB-System (Caress, D. W., and D. N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2022).
    Keywords: Bathymetry; Binary Object; Binary Object (File Size); Binary Object (Media Type); DAM_Underway; DAM Underway Research Data; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; Event label; File content; KEM122; Kongsberg datagram raw file name; KONGSBERG EM122; LATITUDE; LONGITUDE; Multibeam Echosounder; Number of pings; Ship speed; SLAMZ; SO247; SO247_0_Underway-1; Sonne_2; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude
    Type: dataset
    Format: text/tab-separated-values, 5391 data points
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  • 8
    Publication Date: 2024-07-19
    Description: Water column raw data using the ship's own Kongsberg EM 710 multibeam echosounder was not continuously recorded during RV SONNE cruise SO247. Data was recorded only on 2016-04-21. This dataset contains a survey east of New Zealand (North Island) covering parts of the continental slope. The data are archived at the Federal Maritime and Hydrographic Agency of Germany (Bundesamt für Seeschifffahrt und Hydrographie, BSH) and provided to PANGAEA database for data curation and publication. Ancillary sound velocity profiles (SVP) files from the cruise are archived at the BSH and archived at the corresponding multibeam raw dataset https://doi.org/10.1594/PANGAEA.942420. This publication is conducted within the efforts of the German Marine Research Alliance in the core area "Data management and Digitalization" (Deutsche Allianz Meeresforschung, DAM).
    Keywords: Bathymetry; Binary Object; Binary Object (File Size); Binary Object (Media Type); DAM_Underway; DAM Underway Research Data; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; File content; Kongsberg datagram raw file name; LATITUDE; LONGITUDE; Multibeam Echosounder; Number of pings; Ship speed; SO247_0_Underway-2; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude; Swath-mapping system Simrad EM712 (Kongsberg Maritime AS); Water Column Data
    Type: dataset
    Format: text/tab-separated-values, 493 data points
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  • 9
    Publication Date: 2024-07-19
    Description: This submission provides processed seismic reflection data from Research Voyage TAN1808, which took place aboard RV Tangaroa between the 8th of September and the 5th of October, 2018. Raw data are lodged with the New Zealand Government (https://data.nzpam.govt.nz). The research voyage was aimed at characterizing gas hydrate systems on the southern Hikurangi margin of New Zealand, in the region offshore eastern New Zealand. Data were collected with NIWA's (New Zealand) multi-channel seismic reflection system and were processed using the Globe Claritas processing software. Full details of acquisition and processing are included in the voyage report (Crutchley et al. 2018: doi:10.21420/73WW-1W83) and other linked publications.
    Keywords: 61TG20180908; Binary Object; Binary Object (File Size); Date/Time of event; Date/Time of event 2; Event label; File content; gas hydrates; Hikurangi Margin; Latitude of event; Latitude of event 2; Longitude of event; Longitude of event 2; MCSEIS; Multichannel seismics; New Zealand; Seismic reflection data; TAN1808; TAN1808-01; TAN1808-02; TAN1808-03; TAN1808-04; TAN1808-05; TAN1808-06; TAN1808-07; TAN1808-08; TAN1808-09; TAN1808-10; TAN1808-100; TAN1808-101; TAN1808-102; TAN1808-103; TAN1808-104; TAN1808-105; TAN1808-106; TAN1808-107; TAN1808-108; TAN1808-109; TAN1808-11; TAN1808-110; TAN1808-111; TAN1808-112; TAN1808-113; TAN1808-114; TAN1808-115; TAN1808-116; TAN1808-117; TAN1808-118; TAN1808-119; TAN1808-12; TAN1808-120; TAN1808-121; TAN1808-122; TAN1808-123; TAN1808-124; TAN1808-125; TAN1808-126; TAN1808-127; TAN1808-128; TAN1808-129; TAN1808-13; TAN1808-130; TAN1808-131; TAN1808-132; TAN1808-133; TAN1808-134; TAN1808-135; TAN1808-136; TAN1808-137; TAN1808-138; TAN1808-139; TAN1808-14; TAN1808-140; TAN1808-141; TAN1808-142; TAN1808-143; TAN1808-144; TAN1808-145; TAN1808-146; TAN1808-15; TAN1808-16; TAN1808-17; TAN1808-18; TAN1808-19; TAN1808-20; TAN1808-21; TAN1808-22; TAN1808-23; TAN1808-24; TAN1808-25; TAN1808-26; TAN1808-27; TAN1808-28; TAN1808-29; TAN1808-30; TAN1808-31; TAN1808-32; TAN1808-33; TAN1808-34; TAN1808-35; TAN1808-36; TAN1808-37; TAN1808-38; TAN1808-39; TAN1808-40; TAN1808-41; TAN1808-42; TAN1808-43; TAN1808-44; TAN1808-45; TAN1808-46; TAN1808-47; TAN1808-48; TAN1808-49; TAN1808-50; TAN1808-51; TAN1808-52; TAN1808-53; TAN1808-54; TAN1808-55; TAN1808-56; TAN1808-57; TAN1808-58; TAN1808-59; TAN1808-60; TAN1808-61; TAN1808-62; TAN1808-63; TAN1808-64; TAN1808-65; TAN1808-66; TAN1808-67; TAN1808-68; TAN1808-69; TAN1808-70; TAN1808-71; TAN1808-72; TAN1808-73; TAN1808-74; TAN1808-75; TAN1808-76; TAN1808-77; TAN1808-78; TAN1808-79; TAN1808-80; TAN1808-81; TAN1808-82; TAN1808-83; TAN1808-84; TAN1808-85; TAN1808-86; TAN1808-87; TAN1808-88; TAN1808-89; TAN1808-90; TAN1808-91; TAN1808-92; TAN1808-93; TAN1808-94; TAN1808-95; TAN1808-96; TAN1808-97; TAN1808-98; TAN1808-99; Tangaroa; tectonics
    Type: dataset
    Format: text/tab-separated-values, 294 data points
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  • 10
    Publication Date: 2024-07-19
    Description: The 3D seismic cube is in SEG-Y format with SP in byte 5, inline number in byte 25 and xline number in byte 17. Processing includes repositioning, time migration and depth conversion using a smoothed velocity field based on Berndt et al., 2019. Acquisition parameters are discussed in the SO227 cruise report (Berndt et al., 2013).
    Keywords: Depth; File content; File format; File name; File size; Four-Way Closure Ridge; P-Cable 3D Seismic; P-Cable 3D seismic cube; Seismic reflection profile; SEISREFL; SO227; SO227_26-1_27-1_28-1; Sonne; Taiflux; Taiwan; Uniform resource locator/link to metadata file; Uniform resource locator/link to sgy data file
    Type: dataset
    Format: text/tab-separated-values, 10 data points
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