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  • 1
    Online Resource
    Online Resource
    Noise Levels and Signals Observed on Submarine Fibers in the Canary Islands Using DAS
    Seismological Society of America (SSA) ; 2022
    In:  Seismological Research Letters Vol. 93, No. 1 ( 2022-01-01), p. 351-363
    Details
    In: Seismological Research Letters, Seismological Society of America (SSA), Vol. 93, No. 1 ( 2022-01-01), p. 351-363
    Abstract: In this study, we investigate 70 days of distributed acoustic sensing (DAS) recordings in the Canary Islands using an undersea fiber-optic telecommunication cable that links the islands of Tenerife and Gran Canaria. Two DAS interrogators connected to both ends of the cable turned the fiber into an array of 11,968 strain sensors covering a total length of ∼120 km. We present the details of the experiment, noise analysis, and examples of recorded signals. Seismic ambient noise levels assessment indicates poor local coupling of the cable due to the irregular bathymetry that results in high-amplitude acoustic oscillations in some channels. The DAS array recorded several types of nonseismic (vehicles, surface gravity waves, ships) and seismic signals. Local and regional earthquakes were detected with magnitudes mbLg≥2. Surface waves from teleseismic events at a distance of ∼3000 km were also identified in the strain recordings. Here, we report the first observations with DAS of hydroacoustic T waves generated by oceanic earthquakes located at the Central Mid-Atlantic Ridge and the Cape St. Vincent region. Events had magnitudes from Mw 4.2 to 6.9, and the hydroacoustic waves were recorded at epicentral distances from 780 to 3400 km. Our findings show that submarine fiber-optic cables can effectively be used to assess the seismic activity in remote oceanic areas.
    Type of Medium: Online Resource
    ISSN: 0895-0695 , 1938-2057
    URL: Article
    DOI: 10.1785/0220210049
    Language: English
    Publisher: Seismological Society of America (SSA)
    Publication Date: 2022
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  • 2
    Online Resource
    Online Resource
    Passive and active seismological study of bending-related faulting and mantle serpentinization at the Middle America trench
    Elsevier BV ; 2007
    In:  Earth and Planetary Science Letters Vol. 258, No. 3-4 ( 2007-6), p. 528-542
    Details
    In: Earth and Planetary Science Letters, Elsevier BV, Vol. 258, No. 3-4 ( 2007-6), p. 528-542
    Type of Medium: Online Resource
    ISSN: 0012-821X
    URL: Article
    DOI: 10.1016/j.epsl.2007.04.013
    RVK:
    TE 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2007
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    detail.hit.zdb_id: 1466659-5
    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Revised tectonic boundaries in the Cocos Plate off Costa Rica: Implications for the segmentation of the convergent margin and for plate tectonic models
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Solid Earth Vol. 106, No. B9 ( 2001-09-10), p. 19207-19220
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 106, No. B9 ( 2001-09-10), p. 19207-19220
    Abstract: The oceanic Cocos Plate subducting beneath Costa Rica has a complex plate tectonic history resulting in segmentation. New lines of magnetic data clearly define tectonic boundaries which separate lithosphere formed at the East Pacific Rise from lithosphere formed at the Cocos‐Nazca spreading center. They also define two early phase Cocos‐Nazca spreading regimes and a major propagator. In addition to these sharply defined tectonic boundaries are overprinted boundaries from volcanism during passage of Cocos Plate over the Galapagos hot spot. The subducted segment boundaries correspond with distinct changes in upper plate tectonic structure and features of the subducted slab. Newly identified seafloor‐spreading anomalies show oceanic lithosphere formed during initial breakup of the Farallon Plate at 22.7 Ma and opening of the Cocos‐Nazca spreading center. A revised regional compilation of magnetic anomalies allows refinement of plate tectonic models for the early history of the Cocos‐Nazca spreading center. At 19.5 Ma a major ridge jump reshaped its geometry, and after ∼14.5 Ma multiple southward ridge jumps led to a highly asymmetric accretion of lithosphere. A suspected cause of ridge jumps is an interaction of the Cocos‐Nazca spreading center with the Galapagos hot spot.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2001JB000238
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    SSG: 16,13
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  • 4
    Online Resource
    Online Resource
    Focusing on proto‐seismogenic zone of erosional convergent margin
    American Geophysical Union (AGU) ; 2004
    In:  Eos, Transactions American Geophysical Union Vol. 85, No. 7 ( 2004-02-17), p. 70-70
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 85, No. 7 ( 2004-02-17), p. 70-70
    Abstract: Great earthquakes in subduction zones occur after stable slip in the proto‐seismogenic zone transitions to the unstable slip that characterizes seismogenic zones. Subducted material input to seismogenic zones affects this transition. Material structure, lithology and physical properties change progressively during subduction, and according to current hypotheses, specific material transformations trigger the stable to unstable slip transition.Where accretion dominates a convergent margin, material input is trench sediment that is easily drill‐sampled. However, where erosion dominates a margin, material input is unknown because it originates along the base of the upper plate and alters differently. The depth at which material is eroded lies beyond the sampling capabilities of past scientific ocean drilling, so the protoseismogenic zone transformed material has never been drill‐sampled; nor does geophysics resolve its structure, lithology, and physical properties. The Japanese riser drill ship Chikyu in the Integrated Ocean Drilling Program (IODP) overcomes this difficulty. Preparing a site for deep drilling is a much greater task than preparing the shallower sites of past programs, so this is accomplished during workshops.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/2004EO070003
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2004
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  • 5
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    Online Resource
    The crustal structure of the Canary Basin: Accretion processes at slow spreading centers
    American Geophysical Union (AGU) ; 1997
    In:  Journal of Geophysical Research: Solid Earth Vol. 102, No. B5 ( 1997-05-10), p. 10185-10201
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 102, No. B5 ( 1997-05-10), p. 10185-10201
    Abstract: Multichannel seismic reflection and gravity data define the structure of Mesozoic ocean crust of the Canary Basin, formed at slow spreading rates. Single and multichannel seismics show a transition from smooth to rough basement topography from Jurassic to Cretaceous crust and a coeval change in crustal structure. Internal reflectivity of the rough basement area comprises upper, upper middle or whole crust cutting discrete dipping reflections. Lower‐crustal reflectivity is almost absent and reflections from the crust‐mantle transition are short and discontinuous or absent for several kilometers. In contrast, crust in the smooth basement area is characterized by sparse lower crustal events and common reflections from the crust‐mantle boundary. The crustal structure of fracture zones in the rough basement area is associated with depressions in the basement top and in most cases with thin crust. In the smooth basement area, fracture zones exhibit neither a clear topographic expression nor crustal thinning. We interpret these characteristics as indicative of an increase in extensional tectonic activity and decrease in magmatic activity at the spreading ridge associated with a general decrease of spreading rate from Jurassic to Cretaceous times. In addition, the crust imaged across the path of the Cape Verde Hot Spot in the Canary Basin exhibits a widespread lower crustal reflectivity, very smooth topography and apparently thick crust. Our data document significant changes in the structure of crust formed at slow spreading rates which we attribute to thermal changes in the lithosphere due either to variations in spreading rate or to the presence of a hot spot beneath the Mesozoic Mid‐Atlantic Ridge.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/97JB00101
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1997
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    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
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    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
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    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    The nature and distribution of bottom simulating reflectors at the Costa Rican convergent margin
    Oxford University Press (OUP) ; 1998
    In:  Geophysical Journal International Vol. 133, No. 2 ( 1998-05-26), p. 219-229
    Details
    In: Geophysical Journal International, Oxford University Press (OUP), Vol. 133, No. 2 ( 1998-05-26), p. 219-229
    Type of Medium: Online Resource
    ISSN: 0956-540X , 1365-246X
    URL: Article
    DOI: 10.1046/j.1365-246X.1998.00472.x
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 1998
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    detail.hit.zdb_id: 2006420-2
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    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    The continent-to-ocean transition in the Iberia Abyssal Plain
    Geological Society of America ; 2022
    In:  Geology Vol. 50, No. 5 ( 2022-05-01), p. 615-619
    Details
    In: Geology, Geological Society of America, Vol. 50, No. 5 ( 2022-05-01), p. 615-619
    Abstract: Conceptual models of magma-poor rifting are strongly based on studies of the nature of the basement in the continent-to-ocean transition of the Iberia Abyssal Plain, and suggest that exhumed mantle abuts extended continental crust. Yet, basement has only been sampled at a few sites, and its regional nature and the transition to seafloor spreading inferred from relatively low-resolution geophysical data are inadequately constrained. This uncertainty has led to a debate about the subcontinental or seafloor-spreading origin of exhumed mantle and the rift-related or oceanic nature of magmatic crust causing the magnetic J anomaly. Different interpretations change the locus of break-up by & gt;100 km and lead to debate of the causative processes. We present the tomographic velocity structure along a 360-km-long seismic profile centered at the J anomaly in the Iberia Abyssal Plain. Rather than delineating an excessive outpouring of magma, the J anomaly occurs over subdued basement. Furthermore, its thin crust shows the characteristic layering of oceanic crust and is juxtaposed to exhumed mantle, marking the onset of magma-starved seafloor spreading, which yields the westward limit of an ~160-km-wide continent–ocean transition zone where continental mantle has been unroofed. This zone is profoundly asymmetric with respect to its conjugate margin, suggesting that the majority of mantle exhumation occurs off Iberia. Because the J anomaly is related to the final break-up and emplacement of oceanic crust, it neither represents synrift magmatism nor defines an isochron, and hence it poorly constrains plate tectonic reconstructions.
    Type of Medium: Online Resource
    ISSN: 0091-7613 , 1943-2682
    URL: Article
    DOI: 10.1130/G49753.1
    Language: English
    Publisher: Geological Society of America
    Publication Date: 2022
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    SSG: 13
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  • 8
    Online Resource
    Online Resource
    Long-term subduction-erosion along the Guatemalan margin of the Middle America Trench
    Geological Society of America ; 2004
    In:  Geology Vol. 32, No. 7 ( 2004), p. 617-
    Details
    In: Geology, Geological Society of America, Vol. 32, No. 7 ( 2004), p. 617-
    Type of Medium: Online Resource
    ISSN: 0091-7613
    URL: Article
    URL: Article
    DOI: 10.1130/G20422.1
    DOI: 10.1130/2004099
    Language: English
    Publisher: Geological Society of America
    Publication Date: 2004
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    SSG: 13
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  • 9
    Online Resource
    Online Resource
    Generic model of subduction erosion
    Geological Society of America ; 2004
    In:  Geology Vol. 32, No. 10 ( 2004), p. 913-
    Details
    In: Geology, Geological Society of America, Vol. 32, No. 10 ( 2004), p. 913-
    Type of Medium: Online Resource
    ISSN: 0091-7613
    URL: Article
    DOI: 10.1130/G20563.1
    Language: English
    Publisher: Geological Society of America
    Publication Date: 2004
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    detail.hit.zdb_id: 2041152-2
    SSG: 13
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  • 10
    Online Resource
    Online Resource
    Earthquake crisis unveils the growth of an incipient continental fault system
    Springer Science and Business Media LLC ; 2019
    In:  Nature Communications Vol. 10, No. 1 ( 2019-09-02)
    Details
    In: Nature Communications, Springer Science and Business Media LLC, Vol. 10, No. 1 ( 2019-09-02)
    Abstract: Large continental faults extend for thousands of kilometres to form boundaries between rigid tectonic blocks. These faults are associated with prominent topographic features and can produce large earthquakes. Here we show the first evidence of a major tectonic structure in its initial-stage, the Al-Idrissi Fault System (AIFS), in the Alboran Sea. Combining bathymetric and seismic reflection data, together with seismological analyses of the 2016 M w 6.4 earthquake offshore Morocco – the largest event ever recorded in the area – we unveil a 3D geometry for the AIFS. We report evidence of left-lateral strike-slip displacement, characterise the fault segmentation and demonstrate that AIFS is the source of the 2016 events. The occurrence of the M w 6.4 earthquake together with historical and instrumental events supports that the AIFS is currently growing through propagation and linkage of its segments. Thus, the AIFS provides a unique model of the inception and growth of a young plate boundary fault system.
    Type of Medium: Online Resource
    ISSN: 2041-1723
    URL: Article
    DOI: 10.1038/s41467-019-11064-5
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
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