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  1. Artikel ; Online: GEOPHYSICS. Measuring slow slip offshore.

    Tréhu, Anne M

    Science (New York, N.Y.)

    2016  Band 352, Heft 6286, Seite(n) 654–655

    Sprache Englisch
    Erscheinungsdatum 2016-05-06
    Erscheinungsland United States
    Dokumenttyp Comment ; Journal Article
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.aaf6534
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Fluid sources and overpressures within the central Cascadia Subduction Zone revealed by a warm, high-flux seafloor seep.

    Philip, Brendan T / Solomon, Evan A / Kelley, Deborah S / Tréhu, Anne M / Whorley, Theresa L / Roland, Emily / Tominaga, Masako / Collier, Robert W

    Science advances

    2023  Band 9, Heft 4, Seite(n) eadd6688

    Abstract: Pythia's Oasis is a newly discovered seafloor seep on the Central Oregon segment of the Cascadia Subduction Zone, where focused venting emits highly altered fluids ~9°C above the background temperature. The seep fluid chemistry is unique for Cascadia and ...

    Abstract Pythia's Oasis is a newly discovered seafloor seep on the Central Oregon segment of the Cascadia Subduction Zone, where focused venting emits highly altered fluids ~9°C above the background temperature. The seep fluid chemistry is unique for Cascadia and includes extreme enrichment of boron and lithium and depletion of chloride, potassium, and magnesium. We conclude that the fluids are sourced from pore water compaction and mineral dehydration reactions with minimum source temperatures of 150° to 250°C, placing the source at or near the plate boundary offshore Central Oregon. Estimated fluid flow rates of 10 to 30 cm s
    Sprache Englisch
    Erscheinungsdatum 2023-01-25
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.add6688
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: Finding and Using the World’s Gas Hydrates

    Mienert, Jürgen / Tréhu, Anne M. / Berndt, Christian / Camerlenghi, Angelo / Liu, Char-Shine / Massironi, Matteo

    2022  

    Abstract: For the past 50 years, gas hydrates have been regarded by scientists as part of the hydrocarbon reserves, particularly at governmental institutions. A better understanding of the processes controlling the distribution and dynamics of gas hydrates in ... ...

    Abstract For the past 50 years, gas hydrates have been regarded by scientists as part of the hydrocarbon reserves, particularly at governmental institutions. A better understanding of the processes controlling the distribution and dynamics of gas hydrates in nature, especially their sensitivity to changes in gas composition, pressure and temperature, requires both theoretical knowledge of their stability and dynamic behavior and knowledge of how gas hydrates form and where they occur in the sediment. Geophysical data, geochemical data and thermodynamic models indicate that both the rate of response and the total integrated response to climate change in the ocean depend on the location and forms in which hydrates are distributed. Thus, mapping gas hydrates by indirect geophysical methods or through dedicated drilling campaigns is fundamental to all research involving gas hydrates. This includes studies of their role in climate change, their consequences for slope stability, their role at the base of the food web for benthic ecosystems and their potential as a future energy resource. Here we provide a brief introduction to the occurrence of gas hydrates on Earth, and how this information may assist in detecting them on other planetary bodies.
    Sprache Englisch
    Verlag Springer
    Erscheinungsland de
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  4. Artikel ; Online: Impact of the Iquique Ridge on structure and deformation of the north Chilean subduction zone

    Ma, Bo / Geersen, Jacob / Klaeschen, Dirk / Contreras-Reyes, Eduardo / Riedel, Michael / Xia, Yueyang / Tréhu, Anne M. / Lange, Dietrich / Kopp, Heidrun

    2023  

    Abstract: The subduction of seamounts and basement ridges affects the structure, morphology, and physical state of a convergent margin. To evaluate their impact on the seismo-tectonic setting of the subduction zone and the tectonic development of the lower ... ...

    Abstract The subduction of seamounts and basement ridges affects the structure, morphology, and physical state of a convergent margin. To evaluate their impact on the seismo-tectonic setting of the subduction zone and the tectonic development of the lower subducting and upper overriding plate, it is essential to know the precise location of subducted topographic features under the marine forearc. Offshore Northern Chile, the Iquique Ridge represents a broad zone of complex and heterogeneous structure of variable width on the oceanic Nazca Plate, which complicates attempts to project it beneath the forearc of the Chilean subduction zone. Here we use a state-of-the-art seismic reflection data processing approach to map structures related to ridge subduction under the marine forearc with unprecedented accuracy and resolution and evaluate their impact on the deformation of both the plate boundary and the upper plate. We show that significant ridge-related topography is currently subducting south of 20.5 °S and that the combined effect of horst and graben subduction with subduction of Iquique ridge-related thickened and elevated crust causes an upward bulging of the entire upper plate from the plate interface up to the seafloor as well as the presence of kilometer-scale anticlinal structures observed in multibeam bathymetric data that are approximately aligned with horsts seaward of the trench. In the area affected by the subducting ridge, a frontal prism is absent, which may relate to frontal subduction erosion caused by the excess lower plate topography. In contrast farther towards the north, where only isolated seamounts subduct, a small frontal prism and a slope/apron sediment cover down to 3000 m water depth are found.
    Thema/Rubrik (Code) 550
    Sprache Englisch
    Verlag Elsevier
    Erscheinungsland de
    Dokumenttyp Artikel ; Online
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  5. Artikel ; Online: Deep Fault‐Controlled Fluid Flow Driving Shallow Stratigraphically Constrained Gas Hydrate Formation

    Gorman, Andrew R. / Crutchley, Gareth J. / Baker, Dylan R. / Fraser, Douglas R. A. / Henrys, Stuart A. / Tréhu, Anne M. / Harris, Robert N. / Phrampus, Benjamin J. / Pecher, Ingo A.

    Urutī Basin, Hikurangi Margin, New Zealand

    2024  

    Abstract: The Hikurangi Margin east of New Zealand's North Island hosts an extensive gas hydrate province with numerous gas hydrate accumulations related to the faulted structure of the accretionary wedge. One such hydrate feature occurs in a small perched upper‐ ... ...

    Abstract The Hikurangi Margin east of New Zealand's North Island hosts an extensive gas hydrate province with numerous gas hydrate accumulations related to the faulted structure of the accretionary wedge. One such hydrate feature occurs in a small perched upper‐slope basin known as Urutī Basin. We investigated this hydrate accumulation by combining a long‐offset seismic line (10‐km‐long receiver array) with a grid of high‐resolution seismic lines acquired with a 600‐m‐long hydrophone streamer. The long‐offset data enable quantitative velocity analysis, while the high‐resolution data constrain the three‐dimensional geometry of the hydrate accumulation. The sediments in Urutī Basin dip landward due to ongoing deformation of the accretionary wedge. These strata are clearly imaged in seismic data where they cross a distinct bottom simulating reflection (BSR) that dips counterintuitively in the opposite direction to the regional dip of the seafloor. BSR‐derived heat flow estimates reveal a distinct heat flow anomaly that coincides spatially with the upper extent of a landward‐verging thrust fault. We present a conceptual model of this gas hydrate system that highlights the roles of fault‐controlled fluid flow at depth merging into strata‐controlled fluid flow into the hydrate stability zone. The result is a layer‐constrained accumulation of concentrated gas hydrate in the dipping strata. Our study provides new insight into the interplay between deep faulting, fluid flow and gas hydrate formation within an active accretionary margin. Plain Language Summary Gas hydrates are ice‐like substances in which natural gas molecules are trapped in a cage of water molecules. They exist where the pressure is high, temperature is cold, and enough methane is present. These conditions exist in the marine environment at water depths greater than 300–500 m near sediment‐rich continental margins and in polar regions. It is important to study gas hydrates because they represent a significant part of the Earth's carbon budget and influence the ...
    Thema/Rubrik (Code) 550
    Sprache Englisch
    Erscheinungsdatum 2024-03-16
    Verlag AGU (American Geophysical Union)
    Erscheinungsland de
    Dokumenttyp Artikel ; Online
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  6. Artikel ; Online: Shallow seismic investigations of the accretionary complex offshore Central Chile

    Obando-Orrego, Sebastián / Contreras-Reyes, Eduardo / Tréhu, Anne M. / Bialas, Joerg

    2021  

    Abstract: Highlights • We obtain shallow two-dimensional and three-dimensional tomographic Vp models at the landward edge of the Maule accretionary prism (Chile at 35°-36°S). • The Maule accretionary prism is characterized by thrust ridges and shallow cold seep ... ...

    Abstract Highlights • We obtain shallow two-dimensional and three-dimensional tomographic Vp models at the landward edge of the Maule accretionary prism (Chile at 35°-36°S). • The Maule accretionary prism is characterized by thrust ridges and shallow cold seep activity caused by the vertical migration of warm methane-rich fluids into the GHSZ. • Thrust ridges and associated splay fault systems play an important role in the upward fluid migration during the dewatering process of the accretionary prism. Abstract Thrust ridges are accretionary structures often associated with local uplift along splay faults and cold seep activity. We study the influence of a NS-trending thrust ridge system on the transition between the accretionary prism and the continental framework (shelf break) offshore the Maule Region (central Chile at 35°–36°S) by examining its 2-D and 3-D seismic velocity structure. The experiment comprises five densely spaced seismic refraction lines running subparallel to the trench and recorded at nine OBH/S (ocean bottom hydrophone/seismometers) deployed along the central line. Results show a narrow margin-parallel volume (approximately 6 × 50 × 5 km3) whose velocity distribution is consistent with sedimentary rocks. The shallow sedimentary unit is characterized by the presence of very low velocity hydrate-bearing sediments (<1.7 km/s), which are interpreted as highly porous sedimentary rocks (>50% porosity) within the Gas Hydrate Stability Zone (GHSZ) suggesting low hydrate content. These zones spatially correlate with fluid activity in the vicinity of the NS trending thrust ridges based on local high heat flow values (>40 mWm−2) and seepage mapping. On the other hand, the splay faults that crop out on the flanks of the thrust ridge structures might be responsible for tectonically induced vertical fluid migration.
    Thema/Rubrik (Code) 550
    Sprache Englisch
    Verlag Elsevier
    Erscheinungsland de
    Dokumenttyp Artikel ; Online
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  7. Artikel ; Online: Megathrust reflectivity reveals the updip limit of the 2014 Iquique earthquake rupture.

    Ma, Bo / Geersen, Jacob / Lange, Dietrich / Klaeschen, Dirk / Grevemeyer, Ingo / Contreras-Reyes, Eduardo / Petersen, Florian / Riedel, Michael / Xia, Yueyang / Tréhu, Anne M / Kopp, Heidrun

    Nature communications

    2022  Band 13, Heft 1, Seite(n) 3969

    Abstract: The updip limit of seismic rupture during a megathrust earthquake exerts a major control on the size of the resulting tsunami. Offshore Northern Chile, the 2014 Mw 8.1 Iquique earthquake ruptured the plate boundary between 19.5° and 21°S. Rupture ... ...

    Abstract The updip limit of seismic rupture during a megathrust earthquake exerts a major control on the size of the resulting tsunami. Offshore Northern Chile, the 2014 Mw 8.1 Iquique earthquake ruptured the plate boundary between 19.5° and 21°S. Rupture terminated under the mid-continental slope and did not propagate updip to the trench. Here, we use state-of-the-art seismic reflection data to investigate the tectonic setting associated with the apparent updip arrest of rupture propagation at 15 km depth during the Iquique earthquake. We document a spatial correspondence between the rupture area and the seismic reflectivity of the plate boundary. North and updip of the rupture area, a coherent, highly reflective plate boundary indicates excess fluid pressure, which may prevent the accumulation of elastic strain. In contrast, the rupture area is characterized by the absence of plate boundary reflectivity, which suggests low fluid pressure that results in stress accumulation and thus controls the extent of earthquake rupture. Generalizing these results, seismic reflection data can provide insights into the physical state of the shallow plate boundary and help to assess the potential for future shallow rupture in the absence of direct measurements of interplate deformation from most outermost forearc slopes.
    Sprache Englisch
    Erscheinungsdatum 2022-07-08
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-022-31448-4
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  8. Artikel ; Online: Megathrust reflectivity reveals the updip limit of the 2014 Iquique earthquake rupture

    Ma, Bo / Geersen, Jacob / Lange, Dietrich / Klaeschen, Dirk / Grevemeyer, Ingo / Contreras-Reyes, Eduardo / Petersen, Florian / Riedel, Michael / Xia, Yueyang / Tréhu, Anne M. / Kopp, Heidrun

    2022  

    Abstract: The updip limit of seismic rupture during a megathrust earthquake exerts a major control on the size of the resulting tsunami. Offshore Northern Chile, the 2014 Mw 8.1 Iquique earthquake ruptured the plate boundary between 19.5° and 21°S. Rupture ... ...

    Abstract The updip limit of seismic rupture during a megathrust earthquake exerts a major control on the size of the resulting tsunami. Offshore Northern Chile, the 2014 Mw 8.1 Iquique earthquake ruptured the plate boundary between 19.5° and 21°S. Rupture terminated under the mid-continental slope and did not propagate updip to the trench. Here, we use state-of-the-art seismic reflection data to investigate the tectonic setting associated with the apparent updip arrest of rupture propagation at 15 km depth during the Iquique earthquake. We document a spatial correspondence between the rupture area and the seismic reflectivity of the plate boundary. North and updip of the rupture area, a coherent, highly reflective plate boundary indicates excess fluid pressure, which may prevent the accumulation of elastic strain. In contrast, the rupture area is characterized by the absence of plate boundary reflectivity, which suggests low fluid pressure that results in stress accumulation and thus controls the extent of earthquake rupture. Generalizing these results, seismic reflection data can provide insights into the physical state of the shallow plate boundary and help to assess the potential for future shallow rupture in the absence of direct measurements of interplate deformation from most outermost forearc slopes.
    Thema/Rubrik (Code) 550
    Sprache Englisch
    Erscheinungsdatum 2022-07-08
    Verlag Nature Research
    Erscheinungsland de
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  9. Konferenzbeitrag ; Online: Marine forearc structure at the seismogenic up-dip end of the 2014 Iquique Mw 8.1 earthquake

    Petersen, Florian / Lange, Dietrich / Ma, Bo / Geersen, Jacob / Grevemeyer, Ingo / Kopp, Heidrun / Contreras-Reyes, Eduardo / Barrientos, Sergio / Tréhu, Anne M.

    2020  

    Abstract: On April 1st, the Mw 8.1 Iquique earthquake ruptured the plate boundary in the North Chilean marine forearc. The earthquake did not cause enough shallow rupture in the updip area to trigger a significant tsunami in the Pacific Ocean. The segment of South ...

    Abstract On April 1st, the Mw 8.1 Iquique earthquake ruptured the plate boundary in the North Chilean marine forearc. The earthquake did not cause enough shallow rupture in the updip area to trigger a significant tsunami in the Pacific Ocean. The segment of South American subduction-zone affected by the Iquique earthquake was previously considered a seismic gap, as it last ruptured entirely in 1877 during an M~9 earthquake, with a rupture area possibly extending from south of Arica at 19°S to the north of the Mejillones peninsula at 23°S. The smaller magnitude of the 2014 event and the reduced rupture area that only broke the central part of the seismic gap implies a seismo-tectonic segmentation of the marine forearc. To identify the structure of the marine forearc and the subduction plate interface at the shallow seismic/aseismic transition, we use two years of Ocean Bottom Seismometer (OBS) and permanent onshore seismic data recorded eight months after the Iquique mainshock. The high-resolution aftershocks of the 2014 Mw 8.1 Iquique earthquake from the local OBS network together with a seismic reflection image acquired in 2016 of the marine forearc allows us to discuss the structural control on the up-dip extent of seismic rupture in the North Chilean subduction-zone. Most aftershocks occur updip of a co-seismic shallow slip patch in the marine forearc in the vicinity of a large crustal normal fault. A second area of increased aftershocks at the plate interface coincidence with the crustal-scale normal fault that links to the coastal scarp. The updip limit under the marine forearc further correlates with a highly faulted upper-plate and the subduction of Iquique ridge related topography. Combining the results concerning the 2014 Iquique earthquake with information from the 1995 Antofagasta and 2007 Tocopilla earthquakes, we suggest a uniform structural control of seismic rupture that is uniformly active along the Northern Chile.
    Thema/Rubrik (Code) 550
    Sprache Englisch
    Erscheinungsland de
    Dokumenttyp Konferenzbeitrag ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  10. Buch ; Audio / Video: Drilling gas hydrates on hydrate ridge, Cascadia Continental Margin

    Rack, Frank R / Tréhu, Anne M

    covering leg 204 of the cruises of the drilling vessel JOIDES resolution ; Victoria, British Columbia, Canada, to Victoria, British Columbia, Canada, sites 1244 - 1252, 7 July - 2 September 2002

    (Proceedings of the ocean drilling program : Scientific results ; 204.2002)

    2006  

    Verfasserangabe Shipboard staff scientist: Frank R. Rack. Shipboard scientists: Anne M. Tréhu ... Ed.: Anne M. Tréhu
    Serientitel Proceedings of the ocean drilling program : Scientific results ; 204.2002
    Sprache Englisch
    Umfang 1 CD-ROM
    Ausgabenhinweis [Elektronische Ressource]
    Verlag ODP, Ocean Drilling Program
    Erscheinungsort College Station, Tex
    Dokumenttyp Buch ; Audio / Video
    Begleitmaterial 1 Booklet (XX, 40, 24 S.)
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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