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Academic literature on the topic 'Ecuadorian margin'

Author: Grafiati
Published: 25 May 2024

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Journal articles on the topic "Ecuadorian margin"

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Lynner, Colton, Clinton Koch, Susan L. Beck, Anne Meltzer, Lillian Soto-Cordero, Mariah C. Hoskins, Josh C. Stachnik, et al. "Upper-plate structure in Ecuador coincident with the subduction of the Carnegie Ridge and the southern extent of large mega-thrust earthquakes." Geophysical Journal International 220, no. 3 (December 17, 2019): 1965–77. http://dx.doi.org/10.1093/gji/ggz558.

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SUMMARY The Ecuadorian convergent margin has experienced many large mega-thrust earthquakes in the past century, beginning with a 1906 event that propagated along as much as 500 km of the plate interface. Many subsections of the 1906 rupture area have subsequently produced Mw ≥ 7.7 events, culminating in the 16 April 2016, Mw 7.8 Pedernales earthquake. Interestingly, no large historic events Mw ≥ 7.7 appear to have propagated southward of ∼1°S, which coincides with the subduction of the Carnegie Ridge. We combine data from temporary seismic stations deployed following the Pedernales earthquake with data recorded by the permanent stations of the Ecuadorian national seismic network to discern the velocity structure of the Ecuadorian forearc and Cordillera using ambient noise tomography. Ambient noise tomography extracts Vsv information from the ambient noise wavefield and provides detailed constraints on velocity structures in the crust and upper mantle. In the upper 10 km of the Ecuadorian forearc, we see evidence of the deepest portions of the sedimentary basins in the region, the Progreso and Manabí basins. At depths below 30 km, we observe a sharp delineation between accreted fast forearc terranes and the thick crust of the Ecuadorian Andes. At depths ∼20 km, we see a strong fast velocity anomaly that coincides with the subducting Carnegie Ridge as well as the southern boundary of large mega-thrust earthquakes. Our observations raise the possibility that upper-plate structure, in addition to the subducting Carnegie Ridge, plays a role in the large event segmentation seen along the Ecuadorian margin.
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Van Melle, Jeremie, Washinton Vilema, Bastien Faure-Brac, Martha Ordoñez, Henriette Lapierre, Nelson Jimenez, Etienne Jaillard, and Milton Garcia. "Pre-collision evolution of the Piñón oceanic terrane of SW Ecuador: stratigraphy and geochemistry of the “Calentura Formation”." Bulletin de la Société Géologique de France 179, no. 5 (September 1, 2008): 433–43. http://dx.doi.org/10.2113/gssgfbull.179.5.433.

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Abstract The stratigraphic revision of the southern coastal Ecuadorian series makes possible the reconstruction of the pre-collision history of the Caribbean plateau accreted to the Ecuadorian margin. The Coniacian age of the oceanic basement (Piñón Fm) indicates that the latter is part of the Caribbean oceanic plateau. It is overlain by the Calentura Fm, which comprises from base to top: (i) 20 to 200 m of lavas and volcanic breccias of arc affinity (Las Orquídeas Mb), (ii) siliceous, organic rich black limestones of (middle?) Coniacian age, (iii) red, radiolarian rich, calcareous cherts ascribed to the Santonian-early Campanian, and (iv) marls, greywackes and island arc tuffs of Mid Campanian age. The latter are overlain by volcaniclastic turbidites of Mid to Late Campanian age (Cayo Fm), coeval to the Campanian-Maastrichtian island arc series locate farther west (San Lorenzo Fm). The Las Orquídeas magmatic unit is interpreted as resulting from the melting of the Caribbean plateau, rather than from an ephemeral subduction process. The transition from coniacian limestones to santonian red cherts would be related to the thermal subsidence of the Caribbean plateau. The uplift of the latter and the development of the San Lorenzo island arc in the Middle Campanian would be due to the collision of the Caribbean plateau with the Mexican margin. Early in the Late Maastrichtian, the collision of the Caribbean plateau with the Ecuadorian margin would have triggered the cessation of the San Lorenzo arc activity. In the Late Paleocene, the Caribbean plateau was split into two terranes: the western Piñón terrane, which collided with the eastern Guaranda terrane.
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VÉLEZ-ABARCA, LEISBERTH, GABRIEL A. ITURRALDE, HENRY X. GARZÓN, DIEGO GUTIÉRREZ DEL POZO, and LUIS E. BAQUERO. "A new species of the genus Octomeria (Orchidaceae: Pleurothallidinae) from Ecuador." Phytotaxa 637, no. 1 (February 15, 2024): 106–12. http://dx.doi.org/10.11646/phytotaxa.637.1.8.

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A new species of Octomeria was found during an orchid research expedition in the southern Ecuadorian Amazon. Octomeria jimenezii is described and illustrated, and information on its distribution, habitat and conservation status is provided. The newly proposed taxon is morphologically similar to O. pacii, from which it differs by the lower lateral lobes, with an obtuse to subacute angle to the anterior margin.
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Bethoux, Nicole, Monica Segovia, Viviana Alvarez, Jean-Yves Collot, Philippe Charvis, Audrey Gailler, and Tony Monfret. "Seismological study of the central Ecuadorian margin: Evidence of upper plate deformation." Journal of South American Earth Sciences 31, no. 1 (February 2011): 139–52. http://dx.doi.org/10.1016/j.jsames.2010.08.001.

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Bourdon, Erwan, Jean-Philippe Eissen, Marc-André Gutscher, Michel Monzier, Minard L. Hall, and Joseph Cotten. "Magmatic response to early aseismic ridge subduction: the Ecuadorian margin case (South America)." Earth and Planetary Science Letters 205, no. 3-4 (January 2003): 123–38. http://dx.doi.org/10.1016/s0012-821x(02)01024-5.

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Tamay, José, Jesús Galindo-Zaldivar, John Soto, and Antonio J. Gil. "GNSS Constraints to Active Tectonic Deformations of the South American Continental Margin in Ecuador." Sensors 21, no. 12 (June 10, 2021): 4003. http://dx.doi.org/10.3390/s21124003.

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GNSS observations constitute the main tool to reveal Earth’s crustal deformations in order to improve the identification of geological hazards. The Ecuadorian Andes were formed by Nazca Plate subduction below the Pacific margin of the South American Plate. Active tectonic-related deformation continues to present, and it is constrained by 135 GPS stations of the RENAGE and REGME deployed by the IGM in Ecuador (1995.4–2011.0). They show a regional ENE displacement, increasing towards the N, of the deformed North Andean Sliver in respect to the South American Plate and Inca Sliver relatively stable areas. The heterogeneous displacements towards the NNE of the North Andean Sliver are interpreted as consequences of the coupling of the Carnegie Ridge in the subduction zone. The Dolores–Guayaquil megashear constitutes its southeastern boundary and includes the dextral to normal transfer Pallatanga fault, that develops the Guayaquil Gulf. This fault extends northeastward along the central part of the Cordillera Real, in relay with the reverse dextral Cosanga–Chingual fault and finally followed by the reverse dextral Sub-Andean fault zone. While the Ecuadorian margin and Andes is affected by ENE–WSW shortening, the easternmost Manabí Basin located in between the Cordillera Costanera and the Cordillera Occidental of the Andes, underwent moderate ENE–WSW extension and constitutes an active fore-arc basin of the Nazca plate subduction. The integration of the GPS and seismic data evidences that highest rates of deformation and the highest tectonic hazards in Ecuador are linked: to the subduction zone located in the coastal area; to the Pallatanga transfer fault; and to the Eastern Andes Sub-Andean faults.
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Koch, Clinton D., Colton Lynner, Jonathan Delph, Susan L. Beck, Anne Meltzer, Yvonne Font, Lillian Soto-Cordero, et al. "Structure of the Ecuadorian forearc from the joint inversion of receiver functions and ambient noise surface waves." Geophysical Journal International 222, no. 3 (May 15, 2020): 1671–85. http://dx.doi.org/10.1093/gji/ggaa237.

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SUMMARY The Ecuadorian forearc is a complex region of accreted terranes with a history of large megathrust earthquakes. Most recently, a Mw 7.8 megathrust earthquake ruptured the plate boundary offshore of Pedernales, Ecuador on 16 April 2016. Following this event, an international collaboration arranged by the Instituto Geofisico at the Escuela Politécnica Nacional mobilized a rapid deployment of 65 seismic instruments along the Ecuadorian forearc. We combine this new seismic data set with 14 permanent stations from the Ecuadorian national network to better understand how variations in crustal structure relate to regional seismic hazards along the margin. Here, we present receiver function adaptive common conversion point stacks and a shear velocity model derived from the joint inversion of receiver functions and surface wave dispersion data obtained through ambient noise cross-correlations for the upper 50 km of the forearc. Beneath the forearc crust, we observe an eastward dipping slow velocity anomaly we interpret as subducting oceanic crust, which shallows near the projected centre of the subducting Carnegie Ridge. We also observe a strong shallow positive conversion in the Ecuadorian forearc near the Borbon Basin indicating a major discontinuity at a depth of ∼7 km. This conversion is not ubiquitous and may be the top of the accreted terranes. We also observe significant north–south changes in shear wave velocity. The velocity changes indicate variations in the accreted terranes and may indicate an increased amount of hydration beneath the Manabí Basin. This change in structure also correlates geographically with the southern rupture limit of multiple high magnitude megathrust earthquakes. The earthquake record along the Ecuadorian trench shows that no event with a Mw >7.4 has ruptured south of ∼0.5°S in southern Ecuador or northern Peru. Our observations, along with previous studies, suggest that variations in the forearc crustal structure and subducting oceanic crust may influance the occurrence and spatial distribution of high magnitude seismicity in the region.
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Manchuel, Kevin, Marc Régnier, Nicole Béthoux, Yvonne Font, Valentí Sallarès, Jordi Díaz, and Hugo Yepes. "New insights on the interseismic active deformation along the North Ecuadorian-South Colombian (NESC) margin." Tectonics 30, no. 4 (July 21, 2011): n/a. http://dx.doi.org/10.1029/2010tc002757.

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ARIAS, RUTH, NELSON ESPINOSA-ORTEGA, ITALO REVILLA, RAFFAELLA ANSALONI, and SALVATORE TOMASELLO. "Gynoxys revolutifolia (Senecioneae, Asteraceae): A new species from southern Ecuador." Phytotaxa 644, no. 3 (April 16, 2024): 211–19. http://dx.doi.org/10.11646/phytotaxa.644.3.4.

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Gynoxys is a very diverse genus of Asteraceae with an Andean distribution from Venezuela to northern Argentina. It comprises about 130 species, 34 of which are recorded in Ecuador. In the present study, we describe Gynoxys revolutifolia, a new species occurring in Ecuador between Loja and Zamora-Chinchipe provinces. The new species is a shrub or treelet characterized by coriaceous leaves with a strongly revolute margin. After an accurate revision of the main Ecuadorian herbaria and field surveys, we provide a comprehensive comparison of G. revolutifolia with the species it was previously misidentified as. We also provide information concerning the chemical composition, distribution range and conservation status of the new species.
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Marcaillou, Boris, Jean-Yves Collot, Alessandra Ribodetti, Elia d'Acremont, Ammy-Adoum Mahamat, and Alexandra Alvarado. "Seamount subduction at the North-Ecuadorian convergent margin: Effects on structures, inter-seismic coupling and seismogenesis." Earth and Planetary Science Letters 433 (January 2016): 146–58. http://dx.doi.org/10.1016/j.epsl.2015.10.043.

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Dissertations / Theses on the topic "Ecuadorian margin"

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Mallon, Jürgen [Verfasser]. "Benthic Foraminifera of the Peruvian and Ecuadorian Continental Margin / Jürgen Mallon." Kiel : Universitätsbibliothek Kiel, 2012. http://d-nb.info/1020284048/34.

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Hernández, Salazar María José. "Evolution of the forearc basins in Ecuador : from the accretion of oceanic allochthonous terranes to the uplift of the Andes and Coastal Cordilleras." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS236.

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L’Équateur offre une remarquable opportunité d’étude l'évolution des bassins avant arc installés sur un sous-bassement océanique accrété. L'interprétation d'un réseau 2D des profils de sismique réflexion, calibrés par des données de forage et la stratigraphie régionale, a permis de déterminer les étapes de l'évolution de l’avant arc. Les stades pré et syn-accrétion durant le Campanien correspondent au dépôt de séries volcanoclastiques provenant de l'arc insulaire volcanique qui surmontait le plateau océanique. Des chevauchements à vergence NE témoignent un raccourcissement au cours de la collision oblique entre le plateau océanique et la plaque continental. Des failles inverses, des plis et une érosion régionale, marquent la fin de l'accrétion durant l’Éocène inférieur à moyen. L’avant arc sensu-stricto est installé lors de la subduction de la plaque de Farallón sous la plaque Sud-américaine. Un régime d'extension a initié la configuration du double bassin de l'avant arc au début du Néogène. Cette phase coïncide avec la subduction de la plaque de Nazca, qui marque le début du bassin d'avant arc moderne. La subsidence des bassins au cours du Miocène a été en partie contrôlée par la construction des reliefs andins. La segmentation de la marge est contrôlée par la réactivation, au cours du Plio-Pléistocène, de structures héritées en failles inverses et décrochantes. La collision et la subduction de la ride de Carnegie a contrôlé la segmentation de l'avant arc et l'exhumation de la cordillère côtière. Cette étude fournit un exemple remarquable d'évolution d'un bassin avant-arc le long d’une marge en érosion tectonique affectée par la subduction d’une ride volcanique
Ecuador offers a remarkable opportunity to study the evolution of forearc basins installed on accreted oceanic plateau. The interpretation of a network of industrial 2D-Multichannel Seismic Reflection profiles, calibrated with borehole data and regional stratigraphy, allowed to determine the main stages of the forearc evolution. The pre and syn-accretionary stages were documented in the current inner basins by Campanian volcanoclastic deposits sourced by the volcanic island arc which topped the oceanic plateau. NE dipping thrusts ruled shortening at the beginning of the oblique collision between the oceanic plateau and continental plate. Reverse faults and folds are synchronous with a regional erosion linked the end of the accretion during the early-middle Eocene. The forearc sensu-stricto domain is established coeval with the subduction of Farallón plate under South American plate. A regional extensional regimen initiated the double forearc basin configuration along the future Coastal Cordillera during the early Neogene. This phase coincides with the subduction of the Nazca plate, which marks the initiation of modern forearc basins. The basin subsidence during the Miocene was led by the orogenic building effects of the Andean reliefs. The segmentation of the margin is a response of regional uplifts related to strike-slip and reverse reactivation of inherited crustal faults during the Plio-Pleistocene ages. The collision and subduction of the Carnegie ridge explain the forearc segmentation and the coeval Costal Cordillera exhumation. This study provides a remarkable example of the evolution of a non-accretionary-type forearc basin influenced by volcanic ridge subduction
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Book chapters on the topic "Ecuadorian margin"

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Baldock, John W. "The Northern Andes: A Review of the Ecuadorian Pacific Margin." In The Ocean Basins and Margins, 181–217. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2351-8_5.

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Jaillard, E. "Kimmeridgian to Paleocene Tectonic and Geodynamic Evolution of the Peruvian (and Ecuadorian) Margin." In Cretaceous Tectonics of the Andes, 101–67. Wiesbaden: Vieweg+Teubner Verlag, 1994. http://dx.doi.org/10.1007/978-3-322-85472-8_3.

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Michaud, Francois, Jean-Noël Proust, Alexandre Dano, Jean-Yves Collot, Grâce Daniella Guiyeligou, María José Hernández Salazar, Gueorgui Ratzov, et al. "Flare-Shaped Acoustic Anomalies in the Water Column Along the Ecuadorian Margin: Relationship with Active Tectonics and Gas Hydrates." In Pageoph Topical Volumes, 3291–303. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-51529-8_5.

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"At the Margin of the Margins: Contemporary Ecuadorian Exploitation Cinema and the Local Pirate Market." In Latsploitation, Exploitation Cinemas, and Latin America, 277–90. Routledge, 2009. http://dx.doi.org/10.4324/9780203878927-29.

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Idler, Annette. "The Borderland Lens." In Borderland Battles, 66–122. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190849146.003.0003.

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Chapter 3 explains how the gap between state-centric views on borderlines and transnational realities at the margins turn borderlands in vulnerable regions into extreme cases of complex security dynamics. First, it presents how state-centric views that stop at the borderline have historically shaped security policies toward the Colombia-Ecuador and Colombia-Venezuela borders. It then contrasts these with a transnational perspective that analyzes security dynamics from within the Colombian-Ecuadorian and Colombian-Venezuelan borderlands. Adopting such a transnational borderland lens, the chapter maps violent non-state group interactions in recent history across these borderlands and contextualizes them with the spatial distribution of the various cocaine supply chain stages and interconnected forms of transnational organized crime. Together with socioeconomic and cultural conditions that vary along and across the borders, the logic of these illicit cross-border flows informs the groups’ motives for cooperation, which in turn shape their interactions.
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Reports on the topic "Ecuadorian margin"

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Conrad, Jon, Linda Nøstbakken, Steven Stone, Henrik Franklin, and César Viteri. Fisheries Management in the Galapagos Marine Reserve: A Bioeconomic Perspective. Inter-American Development Bank, May 2006. http://dx.doi.org/10.18235/0008751.

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Despite numerous efforts and a large investment by the Ecuadorian Government and the international community, fishery management in Galapagos remains highly conflictive and essentially ineffective. Levels of mistrust and lack of communication have eroded the governance mechanisms in place to resolve conflicts over competing uses in the Reserve. In an effort to provide new information and analytical content into the policy debate regarding fisheries management in the marine reserve, the authors of this paper developed this research utilizing an economic approach to regulating use of the primary commercial fisheries in Galapagos. In particular, the objective of this study is to determine the optimal harvest, escapement, and fishing effort for the small-scale fishing fleet of the Galapagos Marine Reserve (GMR). In this study, the focus of attention is the two most important fisheries: the sea cucumber (pepino de mar, or "pepino") and the spiny red lobster. The authors base their analysis on a stochastic discrete time bioeconomic model developed by Reed (1979).
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Arteaga, Felipe, Gregory Elacqua, Thomas Krussig, Carolina Méndez, and Christopher Neilson. Can Information on School Attributes and Placement Probabilities Direct Search and Choice? Evidence from Choice Platforms in Ecuador and Peru. Inter-American Development Bank, November 2022. http://dx.doi.org/10.18235/0004672.

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This paper evaluates how new information influences families applica- tions and assignment outcomes in elementary school choice settings. Specifi- cally, using a multi-country RCT based in Tacna, Peru and Manta, Ecuador, we examine the effect of providing personalized information on schooling alternatives and placement risk. We find that applicants who received feed- back on placement risk and a suggestion of new schools add more schools to their applications and were more likely to include recommended schools than other alternatives available. Interestingly, the project implemented in Manta, Ecuador had only marginal effects for all outcomes. The main differ- ence across implementations was the inclusion of outreach and information provision through an additional WhatsApp “warning” in Peru, which was not realized in Ecuador. A lower school density seems to have also been a contributing factor to the results observed in the Ecuadorian context.
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