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  • 05.08. Risk  (2)
  • 204-1244B; 204-1244C; 204-1244E; 204-1245A; 204-1245B; 204-1245C; 204-1246A; 204-1246B; 204-1247A; 204-1247B; 204-1248A; 204-1248C; 204-1249A; 204-1249F; 204-1250A; 204-1250C; 204-1250D; 204-1251A; 204-1251B; 204-1251D; 204-1252A; Calculated; Comment; Comment 2 (continued); Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; Elevation of event; Event label; Hydrate; Joides Resolution; Latitude of event; Leg204; Length, difference; Longitude of event; North Pacific Ocean; Number; Ocean Drilling Program; ODP; Recovery; Spacing; Temperature, difference  (1)
Document type
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  • 1
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    Unknown
    Spacing and amplitude of IR temperature anomalies and hydrate content of sediments from ODP Leg 304 sites (Table 1) (2004)
    PANGAEA
    In:  Supplement to: Tréhu, Anne M; Long, Philip E; Torres, Marta E; Bohrmann, Gerhard; Rack, Frank R; Collett, Tim S; Goldberg, D S; Milkov, Alexei V; Riedel, Michael; Schultheiss, P; Bangs, N L; Barr, Samantha R; Borowski, Walter S; Claypool, George E; Delwiche, Mark E; Dickens, Gerald Roy; Gràcia, Eulàlia; Guerin, Gilles; Holland, M; Johnson, J E; Lee, Young-Joo; Liu, C-S; Su, Xin; Teichert, Barbara M A; Tomaru, Hitoshi; Vanneste, M; Watanabe, Mahito; Weinberger, J L (2004): Three-dimensional distribution of gas hydrate beneath southern Hydrate Ridge: constraints from ODP Leg 204. Earth and Planetary Science Letters, 222(3-4), 845-862, https://doi.org/10.1016/j.epsl.2004.03.035
    Details
    Publication Date: 2024-01-09
    Description: Large uncertainties about the energy resource potential and role in global climate change of gas hydrates result from uncertainty about how much hydrate is contained in marine sediments. During Leg 204 of the Ocean Drilling Program (ODP) to the accretionary complex of the Cascadia subduction zone, we sampled the gas hydrate stability zone (GHSZ) from the seafloor to its base in contrasting geological settings defined by a 3D seismic survey. By integrating results from different methods, including several new techniques developed for Leg 204, we overcome the problem of spatial under-sampling inherent in robust methods traditionally used for estimating the hydrate content of cores and obtain a high-resolution, quantitative estimate of the total amount and spatial variability of gas hydrate in this structural system. We conclude that high gas hydrate content (30–40% of pore space or 20–26% of total volume) is restricted to the upper tens of meters below the seafloor near the summit of the structure, where vigorous fluid venting occurs. Elsewhere, the average gas hydrate content of the sediments in the gas hydrate stability zone is generally 〈2% of the pore space, although this estimate may increase by a factor of 2 when patchy zones of locally higher gas hydrate content are included in the calculation. These patchy zones are structurally and stratigraphically controlled, contain up to 20% hydrate in the pore space when averaged over zones ~10 m thick, and may occur in up to ~20% of the region imaged by 3D seismic data. This heterogeneous gas hydrate distribution is an important constraint on models of gas hydrate formation in marine sediments and the response of the sediments to tectonic and environmental change.
    Keywords: 204-1244B; 204-1244C; 204-1244E; 204-1245A; 204-1245B; 204-1245C; 204-1246A; 204-1246B; 204-1247A; 204-1247B; 204-1248A; 204-1248C; 204-1249A; 204-1249F; 204-1250A; 204-1250C; 204-1250D; 204-1251A; 204-1251B; 204-1251D; 204-1252A; Calculated; Comment; Comment 2 (continued); Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; Elevation of event; Event label; Hydrate; Joides Resolution; Latitude of event; Leg204; Length, difference; Longitude of event; North Pacific Ocean; Number; Ocean Drilling Program; ODP; Recovery; Spacing; Temperature, difference
    Type: Dataset
    Format: text/tab-separated-values, 194 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    A first appraisal of the seismogenic and tsunamigenic potential of the largest fault systems in the westernmost Mediterranean (2022)
    Elsevier
    Details
    Publication Date: 2022-02-22
    Description: The westernmost Mediterranean hosts part of the plate boundary between the European and African tectonic plates. Based on the scattered instrumental seismicity, this boundary has been traditionally interpreted as a wide zone of diffuse deformation. However, recent seismic images and seafloor mapping studies support that most of the plate convergence may be accommodated in a few tectonic structures, rather than in a broad region. Historical earthquakes with magnitudes Mw 〉 6 and historical tsunamis support that the low-to-moderate instrumental seismicity might also have led to underestimation of the seismogenic and tsunamigenic potential of the area. We evaluate the largest active faults of the westernmost Mediterranean: the reverse Alboran Ridge, and the strike-slip Carboneras, Yusuf and Al-Idrissi fault systems. For the first time, we use a dense grid of modern seismic data to characterize the entire dimensions of the main fault systems, accurately describe the geometry of these structures and estimate their seismic source parameters. Tsunami scenarios have been tested based on 3D-surfaces and seismic source parameters, using both uniform and heterogeneous slip distributions. The comparison of our results with previous studies, based on limited information on the fault geometry and kinematics, indicates that accurate fault geometries and heterogeneous slip distributions are needed to properly assess the seismic and tsunamigenic potential in this area. Based on fault scaling relations, the four fault systems have a large seismogenic potential, being able to generate earthquakes with Mw 〉 7. The reverse Alboran Ridge Fault System has the largest tsunamigenic potential, being able to generate a tsunami wave amplitude greater than 3 m in front of the coasts of Southern Spain and Northern Africa.
    Description: Published
    Description: 106749
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: JCR Journal
    Keywords: Western Mediterranean ; Seismogenic potential ; Tsunamigenic potential ; Numerical modelling ; Active faults ; Active seismic data ; 04.04. Geology ; 04.07. Tectonophysics ; 04.06. Seismology ; 05.08. Risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 3
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    Sensitivity of Tsunami Scenarios to Complex Fault Geometry and Heterogeneous Slip Distribution: Case‐Studies for SW Iberia and NW Morocco (2021)
    Wiley-AGU
    Details
    Publication Date: 2021-12-23
    Description: The SW Iberian margin is one of the most seismogenic and tsunamigenic areas in W-Europe, where large historical and instrumental destructive events occurred. To evaluate the sensitivity of the tsunami impact on the coast of SW Iberia and NW Morocco to the fault geometry and slip distribution for local earthquakes, we carried out a set of tsunami simulations considering some of the main known active crustal faults in the region: the Gorringe Bank (GBF), Marquês de Pombal (MPF), Horseshoe (HF), North Coral Patch (NCPF) and South Coral Patch (SCPF) thrust faults, and the Lineament South strike-slip fault. We started by considering for all of them relatively simple planar faults featuring with uniform slip distribution; we then used a more complex 3D fault geometry for the faults constrained with a large 2D multichannel seismic dataset (MPF, HF, NCPF, and SCPF); and finally, we used various heterogeneous slip distributions for the HF. Our results show that using more complex 3D fault geometries and slip distributions, the peak wave height at the coastline can double compared to simpler tsunami source scenarios from planar fault geometries. Existing tsunami hazard models in the region use homogeneous slip distributions on planar faults as initial conditions for tsunami simulations and therefore underestimate tsunami hazard. Complex 3D fault geometries and non-uniform slip distribution should be considered in future tsunami hazard updates. The tsunami simulations also support the finding that submarine canyons attenuate the wave height reaching the coastline, while submarine ridges and shallow shelves have the opposite effect.
    Description: Published
    Description: e2021JB022127
    Description: 2T. Deformazione crostale attiva
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: 2TR. Ricostruzione e modellazione della struttura crostale
    Description: 2IT. Laboratori analitici e sperimentali
    Description: JCR Journal
    Keywords: tsunami ; earthquake ; complex fault geometry ; heterogeneous slip distribution ; tsunami numerical modeling ; seismic and tsunami hazard ; 04.04. Geology ; 04.06. Seismology ; 05.08. Risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Limitation Availability
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    PAPER (OA)
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