GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Mass Wasting History within Lake Ohrid Basin (Albania/Macedonia) over the last 600 ka. (2016)
    Springer International Publishing
    In:  In: Submarine Mass Movements and their Consequences. Advances in Natural and Technological Hazards Research, 41 . Springer International Publishing, pp. 291-300. ISBN 978-3-319-20978-4
    Details
    Publication Date: 2019-09-23
    Description: Lake Ohrid (LO), a transboundary lake shared by Macedonia and Albania on the Balkan Peninsula, is not only considered to be the oldest lake in Europe (~2 Ma) but has a long and continuous sedimentary history. An advantage at LO is the availability of hydroacoustic data sets of good quality covering the entire lake basin. The tectonically formed basin is filled with thick undisturbed sediments. However, the overall internal structure of LO is characterized by numerous faults, clinoform structures, and several Mass Transport Deposits (MTDs). By using a seismic chronology model (SCM) correlating seismic reflector packages with Marine Isotope Stages (MIS) we estimate the occurrence of the deepest MTD detected in the southern basin at the transition of MIS9 to MIS8 (~300 ka) defining the onset of the sliding history in LO that is still ongoing today. In general, MTDs are widespread within the basin but they do cluster at active faults. Two large MTDs occurred in the early MIS7 (~230 ka, ~220 ka) and after a quiesence period of about ~70 ka two additional large MTDs have been detected in the late penultimate glacial period MIS6 (~150 ka, 130 ka). MIS5 seemed to be another quiet period with respect to mass wasting. In the younger sedimentary history mass movement is a common process with several large and mid-sized deposits mapped at all stratigraphic levels. The youngest slide deposits are estimated to occur within the last 2,000 years. The main outcome of this paper is a model for the spatial and temporal distribution of mass wasting for Lake Ohrid.
    Type: Book chapter , NonPeerReviewed
    DOI: 10.1007/978-3-319-20979-1_29
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Book chapter
  • 2
    facet.materialart.
    Unknown
    Flow Behaviour of a Giant Landslide and Debris Flow Entering Agadir Canyon, NW Africa (2016)
    Springer International Publishing
    In:  In: Submarine Mass Movements and their Consequences : 7th International Symposium. , ed. by Lamarche, G. Springer International Publishing, Cham, pp. 145-154.
    Details
    Publication Date: 2017-11-22
    Description: Agadir Canyon is one of the largest submarine canyons in the World, supplying giant submarine sediment gravity flows to the Agadir Basin and the wider Moroccan Turbidite System. While the Moroccan Turbidite System is extremely well investigated, almost no data from the source region, i.e. the Agadir Canyon, are available. New acoustic and sedimentological data of the Agadir Canyon area were collected during RV Maria S. Merian Cruise 32 in autumn 2013. The data show a prominent headwall area around 200 km south of the head of Agadir Canyon. The failure occurred along a pronounced weak layer in a sediment wave field. The slab-type failure rapidly disintegrated and transformed into a debris flow, which entered Agadir Canyon at 2500 m water depth. Interestingly, the debris flow did not disintegrate into a turbidity current when it entered the canyon despite a significant increase in slope angle. Instead, the material was transported as debrite for at least another 200 km down the canyon. It is unlikely that this giant debris flow significantly contributed to the deposits in the wider Moroccan Turbidite System.
    Type: Book chapter , NonPeerReviewed
    DOI: 10.1007/978-3-319-20979-1_14
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Book chapter
  • 3
    facet.materialart.
    Unknown
    Shallow Gas and the Development of a Weak Layer in Submarine Spreading, Hikurangi Margin (New Zealand) (2016)
    Springer International Publishing
    In:  In: Submarine Mass Movements and Their Consequences : 7th International Symposium. , ed. by Lamarche, G., Mountjoy, J., Bull, S. and Hubble, T. Advances in Natural and Technological Hazards Research, 37 . Springer International Publishing, Cham, pp. 419-426. ISBN 9783319209784
    Details
    Publication Date: 2021-05-11
    Description: Submarine spreading is a type of mass movement that involves the extension and fracturing of a thin surficial layer of sediment into coherent blocks and their finite displacement on a gently sloping slip surface. Its characteristic seafloor signature is a repetitive pattern of parallel ridges and troughs oriented perpendicular to the direction of mass movement. We map ~30 km2 of submarine spreads on the upper slope of the Hikurangi margin, east of Poverty Bay, North Island, New Zealand, using multibeam echosounder and 2D multichannel seismic data. These data show that spreading occurs in thin, gently-dipping, parallel-bedded clay, silt and sandy sedimentary units deposited as lowstand clinoforms. More importantly, high-amplitude and reverse polarity seismic reflectors, which we interpret as evidence of shallow gas accumulations, occur extensively in the fine sediments of the upper continental slope, but are either significantly weaker or entirely absent where the spreads are located. We use this evidence to propose that shallow gas, through the generation of pore pressure, has played a key role in establishing the failure surface above which submarine spreading occurred. Additional dynamic changes in pore pressure could have been triggered by a drop in sea level during the Last Glacial Maximum and seismic loading.
    Type: Book chapter , NonPeerReviewed
    DOI: 10.1007/978-3-319-20979-1_42
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Book chapter
  • 4
    facet.materialart.
    Unknown
    Revisiting the tsunamigenic volcanic flank-collapse of Fogo Island in the Cape Verdes, offshore West Africa (2020)
    Geological Society London
    In:  In: Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard. , ed. by Georgiopoulou, A. Special Publications Geological Society London, 500 . Geological Society London, London, pp. 13-26.
    Details
    Publication Date: 2020-08-03
    Description: Volcanic archipelagos are a source of numerous on- and offshore geohazards, including explosive eruptions and potentially tsunamigenic large-scale flank-collapses. Fogo Island in the southern Cape Verdes is one of the most active volcanoes in the world, making it both prone to collapse (as evidenced by the ca. 73 ka Monte Amarelo volcanic flank-collapse), and a source of widely-distributed tephra and volcanic material. The offshore distribution of the Monte Amarelo debris avalanche deposits and the surrounding volcaniclastic apron were previously mapped using only medium-resolution bathymetric data. Here, using recently acquired, higher resolution acoustic data, we revisit Fogo's flank-collapse, and find evidence suggesting that the deposition of hummocky volcanic debris originating from the failed eastern flank most likely triggered the contemporaneous, multi-phase failure of pre-existing seafloor sediments. Additionally, we identify, for the first time, multiple mass-transport deposits in the southern part of the volcaniclastic apron of Fogo and Santiago based on the presence of acoustically chaotic deposits in parametric echo sounder data and volcaniclastic turbiditic sands in recovered cores. These preliminary findings indicate a long and complex history of instability on the southern slopes of Fogo and suggest that Fogo may have experienced multiple flank collapses.
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1144/SP500-2019-187
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Book chapter
  • 5
    facet.materialart.
    Unknown
    A new depositional model for the Tuaheni Landslide Complex, Hikurangi Margin, New Zealand (2020)
    Geological Society London
    In:  In: Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard Assessments. , ed. by Georgiopoulou, A. Special Publications Geological Society London, 500 . Geological Society London, London, pp. 551-566.
    Details
    Publication Date: 2020-08-03
    Description: The Tuaheni Landslide Complex (TLC) is characterised by areas of compression upslope and extension downslope. It has been thought to consist of a stack of two genetically linked landslide units identified on seismic data. We use 3D seismic reflection, bathymetry data, and IODP core U1517C (Expedition 372), to understand the internal structures, deformation mechanisms and depositional processes of the TLC deposits. Unit II and Unit III of U1517C correspond to the two chaotic units in 3D seismic data. In the core, Unit II shows deformation whereas Unit III appears more like an in situ sequence. Variance attribute analysis shows that Unit II is split in lobes around a coherent stratified central ridge and is bounded by scarps. By contrast, we find that Unit III is continuous beneath the central ridge and has an upslope geometry that we interpret as a channellevee system. Both units show evidence of lateral spreading due to the presence of the Tuaheni Canyon removing support from the toe. Our results suggest that Unit II and Unit III are not genetically linked, that they are separated substantially in time and they had different emplacement mechanisms, but fail under similar circumstances.
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1144/SP500-2019-180
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    OceanRep: Book chapter
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...