Seismicity of the Earth 1900-2007, Nazca Plate and South America

Rhea, Susan; Hayes, Gavin P.; Villaseñor, A.; Furlong, Kevin P.; Tarr, Arthur C.; Benz, H.

doi:10.3133/ofr20101083e

Cited by 7 publications

(6 citation statements)

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“…Abundant geomorphological evidence for modern deformation of these sediments has been documented (Dumont, 1996). The present-day convergence of the Nazca Plate along the Peruvian coast is directed towards the ENE (N79 ) at a rate that varies between 73 mm/yr at 8 S and 77 mm/yr at 14 S (Dewey and Lamb, 1992;Jaillard et al, 2000;Hampel, 2002;Audin et al, 2008;Rhea et al, 2010). …”

Section: Introduction E Regional Contextmentioning

confidence: 94%

“…1) has been explored for many decades and amongst the key findings are (a) flat-slab subduction (angle of~5 ) due to the buoyancy of the aseismic Juan-de-Fuca and Nazca ridges (Pilger, 1981;Dumont, 1996;Rhea et al, 2010;Espurt et al, 2007), (b) the presence of major, basement-seated, inverted fault systems, (c) the active eastward propagation of the Subandean deformation belts (Megard, 1984;Wine et al, 2002;Hermoza et al, 2006), (d) the basin's limits are controlled by large arches, with dominant ENEeWSW and NWeSE trends, also controlling the hydrocarbon accumulations (Jacques, 2003a,b), (e) the presence of at least three detachment levels, Devonian shales (Cabanillas Fm. ), Permian shales (Ene Fm.)…”

Section: Introduction E Regional Contextmentioning

confidence: 99%

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A new structural model of the Pachitea Basin, Peru: Interaction of thick-skinned tectonics and salt detached thrusting

Witte¹,

Rebaza²,

Westlund

et al. 2015

Journal of South American Earth Sciences

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Section: Introduction E Regional Contextmentioning

confidence: 94%

Section: Introduction E Regional Contextmentioning

confidence: 99%

A new structural model of the Pachitea Basin, Peru: Interaction of thick-skinned tectonics and salt detached thrusting

Witte¹,

Rebaza²,

Westlund

et al. 2015

Journal of South American Earth Sciences

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“…Tomando el valor de 67 500 Km 2 , como el área de ruptura del sismo de la zona SUBS (Rhean et al, 2010), apoyado en las relaciones empíricas propuestas por (Wells y Coppersmith, 1994). Se obtiene una longitud y ancho de la falla de 581Km y 116Km, respectivamente.…”

Section: Mo = µDaunclassified

Evaluación De La Amenaza Por Tsunami en Poblaciones Del Sur, Centro Y Norte Del Litoral Pacífico Colombiano

Castillo¹,

Sánchez²

2019

Bol. Cient. CIOH

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La geomorfología marina en el Pacífico colombiano, se caracteriza por presentar una zona de convergencia de las placas de Nazca y Sudamérica, generando un proceso de subducción Nazca por debajo de la Sudamericana, la alta actividad sísmica en la zona de subducción Colombo-Ecuatoriana. Se han presentado sismos precursores de tsunami, como lo son, los eventos de 1906 y 1979, que afectaron poblaciones costeras del sur del Pacífico colombiano. En su parte norte se evidencia una alta actividad sísmica que podría generar eventos fuertes precursores de tsunami afectando a las poblaciones costeras. Se evaluó la amenaza por tsunami a lo largo del Litoral Pacífico colombiano, a partir del cálculo de la altura del tsunami en las poblaciones de Tumaco, Curay, Juanchaco, Buenaventura, Ciudad Mutis y Juradó. Se utilizó el método determinista, para lo cual se simularon escenarios de tsunami, empleando dos fuentes sísmicas una para el bloque sur y otra para el bloque norte. Se utilizaron dominios de cálculo, construidos con datos batimétricos y altimétricos de alta resolución espacial. El modelo para la simulación de los escenarios de tsunami fue el modelo TUNAMI N2. Como resultado, se obtuvo el tiempo de llegada de la primera ola de tsunami y la inundación máxima en cada población costera. Se concluye que el área más vulnerable y afectada en caso de un tsunami en el Pacífico colombiano es Tumaco.

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“…It is clear that the potential for a strong earthquake in comparison with other regions of the world needs deeper evaluation; on the other hand, the potential for a strong earthquake on a regional scale (assessing the differences between each parts of this mountain range) is not needed. A South American seismic hazard map presented by USGS (Giardini et al, 1999;Rhea et al, 2010) shows that whole region of the Cordillera Blanca is categorised as a zone with maximum peak ground acceleration (PGA) of between 3.2 to 6.4 m s −2 . Although most earthquakes have their origin in the subduction zone of the Pacific Ocean, we suppose that there is no significant difference in the maximum PGA between the west and east side of the Cordillera Blanca.…”

Section: Potential For Dam Failure Following a Strong Earthquake (Scementioning

confidence: 99%

New method for assessing the susceptibility of glacial lakes to outburst floods in the Cordillera Blanca, Peru

Emmer

Vilímek

2014

Hydrol. Earth Syst. Sci.

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Abstract. This paper presents a new and easily repeatable method for assessing the susceptibility of glacial lakes to outburst floods (GLOFs) within the Peruvian region of the Cordillera Blanca. The presented method was designed to: (a) be repeatable (from the point of view of the demands on input data), (b) be reproducible (to provide an instructive guide for different assessors), (c) provide multiple results for different GLOF scenarios and (d) be regionally focused on the lakes of the Cordillera Blanca. Based on the input data gained from remotely sensed images and digital terrain models/topographical maps, the susceptibility of glacial lakes to outburst floods is assessed using a combination of decision trees for clarity and numerical calculation for repeatability and reproducibility. A total of seventeen assessed characteristics are used, of which seven have not been used in this context before. Also, several ratios and calculations are defined for the first time. We assume that it is not relevant to represent the overall susceptibility of a particular lake to outburst floods by one result (number), thus it is described in the presented method by five separate results (representing five different GLOF scenarios). These are potentials for (a) dam overtopping resulting from a fast slope movement into the lake, (b) dam overtopping following the flood wave originating in a lake situated upstream, (c) dam failure resulting from a fast slope movement into the lake, (d) dam failure following the flood wave originating in a lake situated upstream and (e) dam failure following a strong earthquake. All of these potentials include two or three components and theoretically range from 0 to 1. The presented method was verified on the basis of assessing the pre-flood conditions of seven lakes which have produced ten glacial lake outburst floods in the past and ten lakes which have not. A comparison of these results showed that the presented method successfully identified lakes susceptible to outburst floods (pre-flood conditions of lakes which have already produced GLOFs).

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Seismicity of the Earth 1900-2007, Nazca Plate and South America

Cited by 7 publications

References 0 publications

A new structural model of the Pachitea Basin, Peru: Interaction of thick-skinned tectonics and salt detached thrusting

A new structural model of the Pachitea Basin, Peru: Interaction of thick-skinned tectonics and salt detached thrusting

Evaluación De La Amenaza Por Tsunami en Poblaciones Del Sur, Centro Y Norte Del Litoral Pacífico Colombiano

New method for assessing the susceptibility of glacial lakes to outburst floods in the Cordillera Blanca, Peru

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