GLORIA — GEOMAR Library Ocean Research Information Access

Hits per page

hits 1 - 10 | 68 hits

Sorting

Online Resource

RV MARIA S. MERIAN Fahrtbericht / Cruise Report MSM63 - PERMO : Southampton – Southampton (U.K.) 29.04.-25.05.2017 (2017)

Maria S. Merian [Sonstige Person, Familie und Körperschaft]

Kiel : GEOMAR, Helmholtz-Zentrum für Ozeanforschung

add to mindlist on the mindlist

Details Availability

Type of Medium: Online Resource

Pages: 1 Online-Ressource (137 Seiten)

Series Statement: GEOMAR Report N. Ser. 37

URL: http://oceanrep.geomar.de/39234/

Language: English

Note: Zusammenfassung in deutscher und englischer Sprache

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

GEOMAR CATALOGUE

Link to Library Catalog

Unknown

Episodic Venting of a Submarine Gas Seep on Geological Time Scales: Formosa Ridge, Northern South China Sea (2022)

Kunath, Pascal ; Crutchley, Gareth ; Chi, Wu‐Cheng ; [et al.]

add to mindlist on the mindlist

Details

Publication Date: 2024-01-12

Description: The Formosa Ridge cold seep is among the first documented active seeps on the northern South China Sea passive margin slope. Although this system has been the focus of scientific studies for decades, the geological factors controlling gas release are not well understood due to a lack of constraints of the subsurface structure and seepage history. Here, we use high‐resolution 3D seismic data to image stratigraphic and structural relationships associated with fluid expulsion, which provide spatio‐temporal constraints on the gas hydrate system at depth and methane seepage at modern and paleo seafloors. Gas has accumulated beneath the base of gas hydrate stability to a critical thickness, causing hydraulic fracturing, propagation of a vertical gas conduit, and morphological features (mounds) at paleo‐seafloor horizons. These mounds record multiple distinct gas migration episodes between 300,000 and 127,000 years ago, separated by periods of dormancy. Episodic seepage still seems to occur at the present day, as evidenced by two separate fronts of ascending gas imaged within the conduit. We propose that episodic seepage is associated with enhanced seafloor sedimentation. The increasing overburden leads to an increase in effective horizontal stress that exceeds the gas pressure at the top of the gas reservoir. As a result, the conduit closes off until the gas reservoir is replenished to a new (greater) critical thickness to reopen hydraulic fractures. Our results provide intricate detail of long‐term methane flux through sub‐seabed seep systems, which is important for assessing its impact on seafloor and ocean biogeochemistry.

Description: Plain Language Summary: Gas hydrates are ice‐like compounds that form in marine sediments. They can reduce the permeability of the sediments by clogging up the pore spaces, and influence how methane gas flows through sediments and then seeps out of the seafloor. Seepage of methane into the water column plays an important role in seafloor biology and ocean chemistry. In this study, we use 3D seismic imaging to investigate the subseafloor sediments of a ridge in the South China Sea where gas is currently seeping into the ocean. Our data show, in high detail, how gas migrates upward through the sediments due to the buoyancy of gas. Our data also reveal mound structures at certain depths beneath the seafloor. We interpret that these mounds represent distinct phases in the geological past where gas was seeping out of the seafloor. This indicates that gas seepage at this ridge has switched on and off (episodically) throughout geological time. We speculate that the episodic seepage is associated with rapid seafloor sedimentation, which changes pressure conditions beneath the seafloor. Our work improves the understanding of how gas seepage processes can change on geological timescales.

Description: Key Points: Gas has accumulated beneath the base of gas hydrate stability, causing vertical gas conduit formation and seabed mounds. Mounds imaged within the conduit record episodic seepage between 300 and 127 kyrs ago. Quiescence may be associated with enhanced seafloor sedimentation that increases effective stress at the top of the gas reservoir.

Description: MOST

Description: ESAS

Description: TEC

Description: https://doi.pangaea.de/10.1594/PANGAEA.913192

Keywords: ddc:553.1 ; gas hydrate ; gas conduit ; hydraulic fracturing ; episodic venting ; sedimentary processes ; offshore Taiwan

Language: English

Type: doc-type:article

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

CITATION GEO-LEO

Fulltext

Unknown

Ocean bottom seismometer sgy-files of seismic refraction and wide angle data from profiles P1000 and P2000 during Maria S. Merian cruise MSM63 with links to data files (2020)

Schramm, Bettina ; Bayrakci, Gaye ; Dannowski, Anke ; [et al.]

PANGAEA

add to mindlist on the mindlist

Details

Publication Date: 2023-01-30

Description: High-resolution 3D seismic refraction data during research cruise MSM63 in April/May 2017 onboard RV Maria S. Merian. 15 ocean bottom seismometers sampled seismic shots around the Scanner Pockmark, central North Sea. Seismic data are in standard segy-format.

Keywords: Central North Sea; Event label; File content; File format; File name; File size; Maria S. Merian; MCSEIS; MSM63; MSM63_5-1; MSM63_5-10; MSM63_5-11; MSM63_5-12; MSM63_5-13; MSM63_5-14; MSM63_5-15; MSM63_5-16; MSM63_5-17; MSM63_5-2; MSM63_5-3; MSM63_5-5; MSM63_5-6; MSM63_5-7; MSM63_5-9; MSM63_7-2; MSM63_8-1; Multichannel seismics; North Sea; OBS; OBS01; OBS02; OBS03; OBS05; OBS06; OBS07; OBS09; OBS10; OBS11; OBS12; OBS13; OBS14; OBS15; OBS16; OBS17; Ocean bottom seismometer; Optional event label; P1000; P2000; PERMO; Pockmark; seismic refraction; Uniform resource locator/link to metadata file; Uniform resource locator/link to sgy data file

Type: Dataset

Format: text/tab-separated-values, 160 data points

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

DATA PANGAEA

Fulltext

Unknown

Documentation of sediment core MSM31_552-2 (2013)

Gebhardt, Catalina ; Matthiessen, Jens ; Elger, Judith

PANGAEA

In: Alfred Wegener Institute - Polarstern core repository

add to mindlist on the mindlist

Details

Publication Date: 2024-02-16

Keywords: GC; Gravity corer; Maria S. Merian; MSM31; MSM31_552-2; North Greenland Sea

Type: Dataset

Format: unknown

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

DATA PANGAEA

Fulltext

Unknown

Documentation of sediment core MSM31_553-1 (2013)

Gebhardt, Catalina ; Matthiessen, Jens ; Elger, Judith

PANGAEA

In: Alfred Wegener Institute - Polarstern core repository

add to mindlist on the mindlist

Details

Publication Date: 2024-02-16

Keywords: GC; Gravity corer; Maria S. Merian; MSM31; MSM31_553-1; North Greenland Sea

Type: Dataset

Format: unknown

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

DATA PANGAEA

Fulltext

Unknown

Seismic reflection data, sediment core line scanner images and logging data from the Tuaheni Landslide Complex (New Zealand) (2021)

Crutchley, Gareth J ; Elger, Judith ; Kuhlmann, Jannis ; [et al.]

PANGAEA

add to mindlist on the mindlist

Details

Publication Date: 2024-04-20

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

Format: application/zip, 10 datasets

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

DATA PANGAEA

Fulltext

Unknown

Seismic reflection data from the Tuaheni Landslide Complex (New Zealand) (2021)

Crutchley, Gareth J ; Mountjoy, Joshu J ; Krastel, Sebastian ; [et al.]

PANGAEA

add to mindlist on the mindlist

Details

Publication Date: 2024-04-20

Description: This dataset includes seismic reflection 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.

Keywords: Binary Object; Binary Object (File Size); ELEVATION; Elevation 2; Figure; File content; LATITUDE; Latitude 2; LONGITUDE; Longitude 2; MCSEIS; Multichannel seismics; New Zealand; P-Cable; P-Cable 3D Seismic; SCHLIP3D; seismic reflection; South Pacific Ocean; TAN1404; TAN1404_SCHLIP3D; Tangaroa; Tuaheni Landslide Complex

Type: Dataset

Format: text/tab-separated-values, 24 data points

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

DATA PANGAEA

Fulltext

Unknown

3D multichannel seismic reflection processed data (P-Cable system with GI Gun) from RV POSEIDON cruise POS538, Kolumbo Volcano, Aegean Sea (2023)

Crutchley, Gareth J ; Karstens, Jens ; Elger, Judith ; [et al.]

PANGAEA

add to mindlist on the mindlist

Details

Publication Date: 2024-04-20

Description: Included here are 3D post-stack time migrated data from the Kolumbo Volcano in the Aegean Sea. The data were collected aboard RV Poseidon in 2019 during Research Cruise POS538 using GEOMAR's P-Cable seismic system. Seismic source was a Generator-Injector airgun fired in harmonic mode with generator and injector volumes of 45 cubic inches. The source was towed at a nominal depth of 2 m beneath the sea surface. Shot interval was 4 seconds at a ship speed of ~3.5 knots. Gun pressure was set at 200 bar. The receiver geometry consisted of 16 streamer sections attached to a 199 m long cross cable. Processing included: 3D geometry application, trace editing, static time corrections, anomalous amplitude attenuation, FK filtering, pre-stack trace interpolation, adaptive subtraction multiple suppression using a 1D pattern matching algorithm, sorting to common midpoint gathers, normal moveout correction (1517 m/s constant velocity), stacking, trace interpolation, 3D FK coherency filtering, 3D Stolt migration (1517 m/s constant velocity), residual 2D finite difference migration (first inline, then crossline). The dataset has a horizontal resolution of 3.125 m (bin size) and a dominant frequency of ~100 Hz. Acquisition and processing details are included in the EBCDIC header of the SEG-Y file.

Keywords: 3D seismic data; Aegean Sea; Binary Object; Binary Object (File Size); Binary Object (MD5 Hash); File content; Kolumbo Volcano; P-Cable; POS538; POS538_10-1; Poseidon; SEIS; Seismic; THESEUS

Type: Dataset

Format: text/tab-separated-values, 2 data points

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

DATA PANGAEA

Fulltext

Unknown

An 1888 Volcanic Collapse Becomes a Benchmark for Tsunami Models (2017)

Micallef, Aaron ; Watt, Sebastian ; Berndt, Christian ; [et al.]

AGU (American Geophysical Union) | Wiley

In: Eos: Earth & Space Science News, 48 .

add to mindlist on the mindlist

Details

Publication Date: 2021-05-11

Description: When volcanic mountains slide into the sea, they trigger tsunamis. How big are these waves, and how far away can they do damage? Ritter Island provides some answers.

Type: Article , PeerReviewed

Format: text

DOI: 10.1029/2017EO083743

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

OceanRep: Article in a Scientific Journal - peer-reviewed

PDF

Fulltext

Unknown

Submarine slope failures due to pipe structure formation (2018)

Elger, Judith ; Berndt, Christian ; Rüpke, Lars ; [et al.]

Nature Research

In: Nature Communications, 9 (Art.No. 715).

add to mindlist on the mindlist

Details

Publication Date: 2021-03-19

Description: There is a strong spatial correlation between submarine slope failures and the occurrence of gas hydrates. This has been attributed to the dynamic nature of gas hydrate systems and the potential reduction of slope stability due to bottom water warming or sea level drop. However, 30 years of research into this process found no solid supporting evidence. Here we present new reflection seismic data from the Arctic Ocean and numerical modelling results supporting a different link between hydrates and slope stability. Hydrates reduce sediment permeability and cause build-up of overpressure at the base of the gas hydrate stability zone. Resulting hydro-fracturing forms pipe structures as pathways for overpressured fluids to migrate upward. Where these pipe structures reach shallow permeable beds, this overpressure transfers laterally and destabilises the slope. This process reconciles the spatial correlation of submarine landslides and gas hydrate, and it is independent of environmental change and water depth.

Type: Article , PeerReviewed

Format: text

DOI: 10.1038/s41467-018-03176-1

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

OceanRep: Article in a Scientific Journal - peer-reviewed

PDF

Fulltext

hits 1 - 10 | 68 hits