Seismic activity along the central america volcanic arc: is it related to subduction of the Cocos plate?

Guzmán-Speziale, Marco; Valdés‐González, C.; Molina, Emilio; Gómez, Juan Manuel Portilla

doi:10.1016/j.tecto.2005.03.006

Cited by 30 publications

(33 citation statements)

References 39 publications

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“…These coincide geographically with Polochic-Motagua Fault [6], reported as a transition region for other freshwater fish groups [22,13]. In addition, we observed the presence of two well differentiated Lineages of Astyanax (Clade IV in Group I and Clade V in Group II) in sympatry in the Polochic basin, a finding that has not been reported for other characids [15].…”

Section: Other Biogeographical Patternssupporting

confidence: 87%

“…This complexity reflects the confluence of Neotropical and Nearctic biotas and a long history of geological activity, stretching from the Miocene to the present, during which movements of the Cocos, North American, Pacific and Caribbean Plates [6,7] created barriers and land-bridges that have affected the distribution of freshwater fishes [8][9][10][11][12][13]. For example, the Pliocene (~3.…”

Section: Introductionmentioning

confidence: 99%

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Hibernation in an Antarctic Fish: On Ice for Winter

2011

Research Progress in Fisheries Science

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Background: Mesoamerica is one of the world's most complex biogeographical regions, mostly due to its complex geological history. This complexity has led to interesting biogeographical processes that have resulted in the current diversity and distribution of fauna in the region. The fish genus Astyanax represents a useful model to assess biogeographical hypotheses due to it being one of the most diverse and widely distributed freshwater fish species in the New World. We used mitochondrial and nuclear DNA to evaluate phylogenetic relationships within the genus in Mesoamerica, and to develop historical biogeographical hypotheses to explain its current distribution.

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Section: Other Biogeographical Patternssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Hibernation in an Antarctic Fish: On Ice for Winter

2011

Research Progress in Fisheries Science

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“…The absence of a significant trench-normal component of station motion in the velocities of GPS sites in Nicaragua and El Salvador imply weak or no coupling across the Cocos plate subduction interface (Cáceres et al, 2005;Guzmán-Speziale, 2001;Lyon-Caen et al, 2006). The dextral strike-slip movement in El Salvador is caused by the Caribbean drift forces that produce the relative displacement of the Chortis Block to the east, owing to the required low coupling of the subducted plate (Cáceres et al, 2005;Guzmán-Speziale et al, 2005;Álvarez-Gómez et al, 2008;Correa-Mora et al, 2009;Franco et al, 2012). The complexity of the ESFZ structure and the kinematics variations along strike is associated with the incipient character of the shallow fault zone structure and the lateral variation of the angle between the principal displacement zone and the Caribbean drift forces (transtension).…”

Section: Discussionmentioning

confidence: 99%

Structural evolution of the El Salvador Fault Zone: an evolving fault system within a volcanic arc.

Catalán

Díaz

Pérez

et al. 2014

Journal of Iberian Geology

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The El Salvador Fault Zone, firstly identified after the 13th February 2001 Mw 6.6 El Salvador earthquake, is a 150 km long, 20 km wide right-lateral strike-slip fault system. Ruptures along the ESFZ are thought to be responsible for most of the historical destructive earthquakes along the El Salvador Volcanic Arc, as well as for most of the current seismicity of the area. In this work, we focus on the geological setting of the fault zone by describing its geomorphology and structure, using field-based observations, digital terrain modelling, and aerial photograph interpretation with the aim at contributing to the understanding of the ESFZ slip behaviour. In particular, we address the ESFZ structure, kinematics and evolution with time.The ESFZ is a complex set of traces divided in major rupture segments characterized by different geometry, kinematics and geomorphic expressions. Natural fault exposures and paleoseismic trenches excavated along the fault show that the strike-slip deformation is distributed in several planes. Both geometry and kinematics of the fault zone are consistent with a transtensional strain regime.The estimated geological slip rate for the main fault segments by paleoseismic trenches and displaced geomorphic features implies a deficit in velocity of the fault compared to the available GPS velocities data. The high vertical scarps of some fault segments would require Quaternary slip rates not coherent neither with measured GPS velocities nor with slip rates obtained from paleoseismic analysis. This mismatch suggests a pre-existing graben structure that would be inherited from the previous regional roll back related extensional stage. We consider that the ESFZ is using this relict structure to grow up along it. As a result, we propose a model for ESFZ development consistent with all these observations. Keywords: El Salvador Fault Zone, active strike-slip fault, 13 February 2001 earthquake, geomorphology, Volcanic arc Resumen La Zona de Falla de El Salvador (ZFES) es un sistema de falla de desgarre dextral de 150 km de longitud y 20 de anchura, que fue identificada por primera vez después del terremoto de Mw 6.6 de El Salvador de febrero de 2001. La mayoría de la sismicidad y de los terremotos históricos destructivos producidos en el arco volcánico salvadoreño han sido producidos por la ruptura de la ZFES. Este trabajo se centra en el marco geológico de la zona de falla describiendo su geomorfología y su estructura a través de observaciones de campo, del estudio de los modelos digitales del terreno y de la interpretación de las fotografías aéreas, con el objetivo de avanzar en el conocimiento del comportamiento de la ZFES. En concreto trataremos del estudio de la estructura, la cinemática y la evolución de la ZFES.La ZFES es un complejo sistema de fallas divididas en varios segmentos que se diferencian en la geometría, la cinemática y la expresión geomorfológica. En los afloramientos de la falla, así como en las trincheras paleosismicas excavadas se ha observado que la deformación de d...

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“…This volcanic province undoubtedly represents a subduction-related setting from several other independent lines of evidence (Molnar and Sykes, 1969;Carr et al, 1982Carr et al, , 2007Burbach et al, 1984;Carr and Rose, 1986;Guzmán-Speziale et al, 2005;Walker et al, 2009). § IA-island arc; CR-continental rift; OI-ocean island; Col-collision; x s !…”

Section: Central American Volcanic Arc (Cava)mentioning

confidence: 63%

Present state of knowledge and new geochemical constraints on the central part of the Mexican Volcanic Belt and comparison with the Central American Volcanic Arc in terms of near and far trench magmas

Verma¹

2015

Turkish J Earth Sci

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A brief critical review is presented of the geological, geophysical, geochemical, and plate tectonic evidence for the origin and evolution of the central part of the Mexican Volcanic Belt (C-MVB). Databases were constructed for the C-MVB from new and published data as well as for the Central American Volcanic Arc (CAVA), other continental and island arcs, continental rifts or extensional areas, and collision zones. Conventional procedures as well as statistical techniques of multidimensional tectonic discrimination diagrams and significance tests were used to interpret the data. A subdivision of the databases for the C-MVB and CAVA into near the trench or front-arc and far from the trench or backarc magmas helped to demonstrate the lack of slab input for the C-MVB and the presence of a classic arc-trench system for the CAVA. The use of software IgRoCS, DODESSYS, UDASYS, TecD, and TecDIA provided the following conclusions: 1) basic magmas in the C-MVB that originated in the mantle without the involvement of the subducted slab represent a continental rift setting; 2) C-MVB acid and intermediate magmas that originated, respectively, from the crust and mixed mantle-crustal sources do not show a clear influence of the present subducted slab and represent the tectonic setting of the older crustal and mixed mantle-crustal source rocks; and 3) all rocks in the CAVA were derived from the involvement of the subducted slab and represent a classical continental arc system related to the subduction of the Cocos plate beneath the Caribbean plate, whereas CAVA back-arc rocks originated mainly in the mantle, probably with much less involvement of the subducted slab. Reinterpretation of the Sr, Nd, Pb, and Hf isotopic data supports these inferences. I propose a new tectono-petrogenetic model based on the continuation of the extensional tectonics related to the triple rift system in the western part of the MVB.

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Seismic activity along the central america volcanic arc: is it related to subduction of the Cocos plate?

Cited by 30 publications

References 39 publications

Hibernation in an Antarctic Fish: On Ice for Winter

Hibernation in an Antarctic Fish: On Ice for Winter

Structural evolution of the El Salvador Fault Zone: an evolving fault system within a volcanic arc.

Present state of knowledge and new geochemical constraints on the central part of the Mexican Volcanic Belt and comparison with the Central American Volcanic Arc in terms of near and far trench magmas

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