Morphology and magnetic survey of the Rivera-Cocos plate boundary of Colima, Mexico

Gaviria, Juan Ramón Peláez; Gutiérrez, Carlos A. Mortera; Bandy, William L.; Michaud, François

doi:10.1016/s0016-7169(13)71463-6

Cited by 14 publications

(6 citation statements)

References 40 publications

(77 reference statements)

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“…En los perfiles se grafican los hipocentros de Pardo (1993), los eventos del boletín EHB, los mecanismos focales de Pardo y Suárez (1995), la microsismicidad local y mecanismos de Martínez-López (2011), y los mecanismos focales del CMT (2013) y del SSN (2013). El límite entre las placas de Rivera y de Cocos a lo largo de la trinchera se ha discutido por diferentes autores sin haber una clara definición hasta el momento (Larson, 1972;Bandy et al, 1995;Serrato-Díaz et al, 2004;Yang et al, 2009;Peláez-Gaviria et al, 2013). Bandy et al (1995; proponen que el Graben el Gordo podría indicar la transición entre las placas de Rivera y de Cocos.…”

Section: Análisis Y Resultadosunclassified

Acoplamiento sismogénico en la zona de subducción de MichoacánColima-Jalisco, México

López

Mendoza

2016

BSGM

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Acoplamiento sismogénico en la zona de subducción México 199 Resumen Se analizaron los hipocentros y mecanismos focales de los sismos ocurridos en el suroeste de México entre 1964 y 2008 para examinar el ancho sismogénico de la zona de subducción de Michoacán-Colima-Jalisco. Esta zona incluye el segmento de Michoacán en la porción noroeste de la placa de Cocos y el segmento de Jalisco que corresponde a la placa de Rivera. En el segmento de Michoacán la profundidad máxima estimada para la zona de acoplamiento sismogénico es 40 km. Esta profundidad es mayor al valor de 25 km propuesto anteriormente para la placa de Cocos. Para la placa de Rivera la profundidad máxima del contacto sismogénico también es 40 km, consistente con el valor propuesto anteriormente. Este valor sugiere un ancho sismogénico distinto para cada segmento por la diferencia en el ángulo de buzamiento entre las placas de Cocos y de Rivera. Las dimensiones del contacto sismogénico estimadas para el segmento de Michoacán (300 km x 95 km) y para el segmento de Jalisco (420 km x 75 km) indican una magnitud máxima similar de Mw 8.3 con un deslizamiento promedio esperado de 2 m. Estos resultados tienen implicaciones importantes para la estimación del potencial sísmico en la zona de subducción de Michoacán-Colima-Jalisco.Palabras clave: Sismicidad, mecanismos focales, subducción en México, zona sismogénica. AbstractHypocenters and focal mechanisms of earthquakes in southwestern Mexico between 1964 and2008 were analyzed to examine the seismogenic width of the Michoacan-Colima-Jalisco subduction zone. This subduction zone includes the Michoacan segment in the northwest portion of the Cocos plate and the Jalisco segment, which corresponds to the Rivera plate. In the Michoacan segment, the maximum depth of seismogenic coupling is approximately 40 km. This depth is greater than the value of 25 km previously proposed for the entire Cocos plate. For the Rivera plate, the maximum seismogenic depth is also 40 km, consistent with the previously proposed value. This value suggests a different seismogenic width for each segment due to the difference in dip between the Cocos and Rivera plates. The dimensions of the seismogenic contact estimated for the Michoacan segment (300 km x 95 km) and for the Jalisco segment (420 km x 75 km) indicate a similar maximum magnitude of Mw 8.3 with an expected average slip of 2 m. These results have important implications for the estimation of the seismic potential in the Michoacan-Colima-Jalisco subduction zone.

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Section: Análisis Y Resultadosunclassified

Acoplamiento sismogénico en la zona de subducción de MichoacánColima-Jalisco, México

López

Mendoza

2016

BSGM

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“…The west-east propagating volcanism along the MVB reached the longitude of Mexico City at about 7 Ma. Additionally, Peláez Gaviria et al [ 55 ] have reported changes during the last 3.5 Ma in the plate configuration at the north of the Middle America Trench (MAT) as a result of (a) the propagation of the Pacific-Cocos Segment of the East Pacific Rise (EPR-PCS), (b) the collision of the EPR-PCS with the MAT at 1.7 Ma, and (c) the formation of the Rivera Transform.…”

Section: Discussionmentioning

confidence: 99%

Multivariate Analysis, Mass Balance Techniques, and Statistical Tests as Tools in Igneous Petrology: Application to the Sierra de las Cruces Volcanic Range (Mexican Volcanic Belt)

Velasco-Tapia

2014

The Scientific World Journal

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Magmatic processes have usually been identified and evaluated using qualitative or semiquantitative geochemical or isotopic tools based on a restricted number of variables. However, a more complete and quantitative view could be reached applying multivariate analysis, mass balance techniques, and statistical tests. As an example, in this work a statistical and quantitative scheme is applied to analyze the geochemical features for the Sierra de las Cruces (SC) volcanic range (Mexican Volcanic Belt). In this locality, the volcanic activity (3.7 to 0.5 Ma) was dominantly dacitic, but the presence of spheroidal andesitic enclaves and/or diverse disequilibrium features in majority of lavas confirms the operation of magma mixing/mingling. New discriminant-function-based multidimensional diagrams were used to discriminate tectonic setting. Statistical tests of discordancy and significance were applied to evaluate the influence of the subducting Cocos plate, which seems to be rather negligible for the SC magmas in relation to several major and trace elements. A cluster analysis following Ward's linkage rule was carried out to classify the SC volcanic rocks geochemical groups. Finally, two mass-balance schemes were applied for the quantitative evaluation of the proportion of the end-member components (dacitic and andesitic magmas) in the comingled lavas (binary mixtures).

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“…The atypical Rivera-Pacific-Cocos plate boundary is considered to be a transform fault with a complex stress pattern, which many authors have studied (e.g., Larson, 1972; Reid , 1976;Mammerickx, 1980;Bourgois and Michaud, 1991;Michaud et al, 1997;DeMets and Traylen, 2000;Michaud et al, 2000;Peláez-Gaviria et al, 2013). Initially, the Rivera Transform (RT) was proposed to consist of two domains (Larson, 1972;Reid, 1976;Mammerickx, 1980) 1976; Reid, 1976;Prothero and Reid, 1982).…”

Section: Tectonic Settingmentioning

confidence: 99%

The TsuJal Amphibious Seismic Network: A Passive-Source Seismic Experiment in Western Mexico

Núñez-Cornũ¹,

Córdoba²,

Bandy³

et al. 2021

Front. Earth Sci.

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The geodynamic complexity in the western Mexican margin is controlled by the multiple interactions between the Rivera, Pacific, Cocos, and North American plates, as evidenced by a high seismicity rate, most of whose hypocenters are poorly located. To mitigate this uncertainty with the aim of improving these hypocentral locations, we undertook the TsuJal Project, a passive seafloor seismic project conducted from April to November 2016. In addition to the Jalisco Seismic Network, 10 LCHEAPO 2000 Ocean Bottom Seismometers (OBSs) were deployed by the BO El Puma in a seafloor array from the Islas Marías Archipelago (Nayarit) to the offshore contact between the states of Colima and Michoacan. We located 445 earthquakes in four or more OBSs within the deployed array. Most of these earthquakes occurred in the contact region of the Rivera, Pacific, and Cocos plates, and a first analysis suggests the existence of three seismogenic zones (West, Center, and East) along the Rivera Transform fault that can be correlated with its morphological expression throughout the three seismogenic zones. The seismicity estimates that the Moho discontinuity is located at 10 km depth and supports earlier works regarding the West zone earthquake distribution. Subcrustal seismicity in the Central zone suggests that the Intra-Transform Spreading Basin domain is an ultra-low spreading ridge. A seismic swarm occurred during May and June 2016 between the eastern tip of the Paleo-Rivera Transform fault and the northern tip of the East Pacific Rise-Pacific Cocos Segment, illuminating some unidentified tectonic feature.

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Morphology and magnetic survey of the Rivera-Cocos plate boundary of Colima, Mexico

Cited by 14 publications

References 40 publications

Acoplamiento sismogénico en la zona de subducción de MichoacánColima-Jalisco, México

Acoplamiento sismogénico en la zona de subducción de MichoacánColima-Jalisco, México

Multivariate Analysis, Mass Balance Techniques, and Statistical Tests as Tools in Igneous Petrology: Application to the Sierra de las Cruces Volcanic Range (Mexican Volcanic Belt)

The TsuJal Amphibious Seismic Network: A Passive-Source Seismic Experiment in Western Mexico

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