dor_id: 4132326

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650.#.4.x: Físico Matemáticas y Ciencias de la Tierra

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100.1.#.a: Rebollar, Cecilio J.; Espíndola, Víctor H.; Uribe, Antonio; Mendoza, Antonio; Pérez-vertti, Arturo

524.#.#.a: Rebollar, Cecilio J., et al. (1999). Distributions of stresses and geometry of the Wadati-Benioff zone under Chiapas, Mexico. Geofísica Internacional; Vol. 38 Núm. 2: Abril 1, 1999; 95-106. Recuperado de https://repositorio.unam.mx/contenidos/4132326

245.1.0.a: Distributions of stresses and geometry of the Wadati-Benioff zone under Chiapas, Mexico

502.#.#.c: Universidad Nacional Autónoma de México

561.1.#.a: Instituto de Geofísica, UNAM

264.#.0.c: 1999

264.#.1.c: 1999-04-01

653.#.#.a: Sismicidad; zona de Wadati-Benioff; mecanismos focales; distribución de esfuerzos; Seismicity; Wadati-Benioff zone; focal mechanisms; stress distribution

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520.3.#.a: Seismicity recorded from June 1994 to May 1995 on a portable network of analog and digital seismic stations defines the geometry of the Wadati-Benioff zone under Chiapas and the distributions of the principal stresses along the subducted slab. Seismicity at the outer-rise region is not well located. A Poisson’s ratio of 0.24 was calculated for the crust of Chiapas. We located 321 earthquakes in the magnitude range from 3.3 to 5.6. Hypocenters define a Wadati-Benioff zone 39±4 km thick dipping 40° ± 3° to N45° E. Earthquake depths range from 10 km to 300 km. The Cocos plate dips nearly 25° in Oaxaca, 30° to 35° under the Gulf of Tehuantepec and 40° to the Southeast. A major change in dip occurs at the intersection of the Tehuantepec Ridge with the Middle America Trench. Seismicity in this zone is diffuse to depths of 200 km. Our data suggests a gradual increase of the dip of the Cocos plate from Oaxaca to Chiapas. Focal mechanisms of events with depths less than 50 km indicate that the subducted crust is under tension in this region, while at depths between 50 and 200 km there is a mixed pattern of stress distribution. At depths from 200 to 300 km the subducted lithosphere is under down-dip compression.doi: https://doi.org/10.22201/igeof.00167169p.1999.38.2.386

773.1.#.t: Geofísica Internacional; Vol. 38 Núm. 2: Abril 1, 1999; 95-106

773.1.#.o: http://revistagi.geofisica.unam.mx/index.php/RGI

022.#.#.a: ISSN-L: 2954-436X; ISSN impreso: 0016-7169

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doi: https://doi.org/10.22201/igeof.00167169p.1999.38.2.386

handle: 0093f041f6c3aa70

harvesting_date: 2023-06-20 16:00:00.0

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245.1.0.b: Distributions of stresses and geometry of the Wadati-Benioff zone under Chiapas, Mexico

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Artículo

Distributions of stresses and geometry of the Wadati-Benioff zone under Chiapas, Mexico

Rebollar, Cecilio J.; Espíndola, Víctor H.; Uribe, Antonio; Mendoza, Antonio; Pérez-vertti, Arturo

Instituto de Geofísica, UNAM, publicado en Geofísica Internacional, y cosechado de Revistas UNAM

Licencia de uso

Procedencia del contenido

Entidad o dependencia
Instituto de Geofísica, UNAM
Revista
Repositorio
Contacto
Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx

Cita

Rebollar, Cecilio J., et al. (1999). Distributions of stresses and geometry of the Wadati-Benioff zone under Chiapas, Mexico. Geofísica Internacional; Vol. 38 Núm. 2: Abril 1, 1999; 95-106. Recuperado de https://repositorio.unam.mx/contenidos/4132326

Descripción del recurso

Autor(es)
Rebollar, Cecilio J.; Espíndola, Víctor H.; Uribe, Antonio; Mendoza, Antonio; Pérez-vertti, Arturo
Tipo
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Título
Distributions of stresses and geometry of the Wadati-Benioff zone under Chiapas, Mexico
Fecha
1999-04-01
Resumen
Seismicity recorded from June 1994 to May 1995 on a portable network of analog and digital seismic stations defines the geometry of the Wadati-Benioff zone under Chiapas and the distributions of the principal stresses along the subducted slab. Seismicity at the outer-rise region is not well located. A Poisson’s ratio of 0.24 was calculated for the crust of Chiapas. We located 321 earthquakes in the magnitude range from 3.3 to 5.6. Hypocenters define a Wadati-Benioff zone 39±4 km thick dipping 40° ± 3° to N45° E. Earthquake depths range from 10 km to 300 km. The Cocos plate dips nearly 25° in Oaxaca, 30° to 35° under the Gulf of Tehuantepec and 40° to the Southeast. A major change in dip occurs at the intersection of the Tehuantepec Ridge with the Middle America Trench. Seismicity in this zone is diffuse to depths of 200 km. Our data suggests a gradual increase of the dip of the Cocos plate from Oaxaca to Chiapas. Focal mechanisms of events with depths less than 50 km indicate that the subducted crust is under tension in this region, while at depths between 50 and 200 km there is a mixed pattern of stress distribution. At depths from 200 to 300 km the subducted lithosphere is under down-dip compression.doi: https://doi.org/10.22201/igeof.00167169p.1999.38.2.386
Tema
Sismicidad; zona de Wadati-Benioff; mecanismos focales; distribución de esfuerzos; Seismicity; Wadati-Benioff zone; focal mechanisms; stress distribution
Idioma
spa
ISSN
ISSN-L: 2954-436X; ISSN impreso: 0016-7169

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