“The September 30, 2012 M 7.3 earthquake west of Isnos, Colombia, occurred as a result of normal faulting deep within the subducting Nazca slab. The earthquake ruptured a fault in the interior of the inclined subduction zone that dips to the east-northeast beneath South America, having begun its decent into the mantle at the South America trench offshore of Colombia and Ecuador. The event resulted from stresses generated by the slow distortion of the subducting plate as it descends through the mantle, rather than on the thrust interface that constitutes the boundary between the Nazca and overlying South America plates; the latter is active only near the Earth’s surface, while the subducting Nazca plate generates intraplate earthquakes to depths of 200 km or more in this region. At the latitude of this event, the Nazca plate moves east-northeast with respect to the South America plate at a rate of approximately 60 mm/yr.” (1)
“Fuerte sismo sacude el suroeste de Colombia y se siente en Ecuador, Panamá y Venezuela. (…) No hubo alerta de tsunami y no se han reportado de manera inmediata víctimas o daños materiales en el área afectada.” (2)
PRIMERAS IMÁGENES: Un sismo de 7,1 grados sacude ColombiaActualidadRT
“Los usuarios colombianos de redes sociales han reportado que sintieron el temblor durante casi un minuto en Medellín, Cali y Bogotá.”
Deep earthquakes in this region of the Nazca plate are not uncommon; there have been 13 similar events deeper than 100 km over the past 40 years, within 500 km of the September 30 2012 earthquake. The largest was a magnitude 7.1 earthquake at a depth of 206 km in August of 2010, 380 km to the south of the September 30 event.
Seismotectonics of South America (Nazca Plate Region)
The South American arc extends over 7,000 km, from the Chilean margin triple junction offshore of southern Chile to its intersection with the Panama fracture zone, offshore of the southern coast of Panama in Central America. It marks the plate boundary between the subducting Nazca plate and the South America plate, where the oceanic crust and lithosphere of the Nazca plate begin their descent into the mantle beneath South America. The convergence associated with this subduction process is responsible for the uplift of the Andes Mountains, and for the active volcanic chain present along much of this deformation front. Relative to a fixed South America plate, the Nazca plate moves slightly north of eastwards at a rate varying from approximately 80 mm/yr in the south to approximately 65 mm/yr in the north. Although the rate of subduction varies little along the entire arc, there are complex changes in the geologic processes along the subduction zone that dramatically influence volcanic activity, crustal deformation, earthquake generation and occurrence all along the western edge of South America.
Most of the large earthquakes in South America are constrained to shallow depths of 0 to 70 km resulting from both crustal and interplate deformation. Crustal earthquakes result from deformation and mountain building in the overriding South America plate and generate earthquakes as deep as approximately 50 km. Interplate earthquakes occur due to slip along the dipping interface between the Nazca and the South American plates. Interplate earthquakes in this region are frequent and often large, and occur between the depths of approximately 10 and 60 km. Since 1900, numerous magnitude 8 or larger earthquakes have occurred on this subduction zone interface that were followed by devastating tsunamis, including the 1960 M9.5 earthquake in southern Chile, the largest instrumentally recorded earthquake in the world. Other notable shallow tsunami-generating earthquakes include the 1906 M8.5 earthquake near Esmeraldas, Ecuador, the 1922 M8.5 earthquake near Coquimbo, Chile, the 2001 M8.4 Arequipa, Peru earthquake, the 2007 M8.0 earthquake near Pisco, Peru, and the 2010 M8.8 Maule, Chile earthquake located just north of the 1960 event.
Large intermediate-depth earthquakes (those occurring between depths of approximately 70 and 300 km) are relatively limited in size and spatial extent in South America, and occur within the Nazca plate as a result of internal deformation within the subducting plate. These earthquakes generally cluster beneath northern Chile and southwestern Bolivia, and to a lesser extent beneath northern Peru and southern Ecuador, with depths between 110 and 130 km. Most of these earthquakes occur adjacent to the bend in the coastline between Peru and Chile. The most recent large intermediate-depth earthquake in this region was the 2005 M7.8 Tarapaca, Chile earthquake.
Earthquakes can also be generated to depths greater than 600 km as a result of continued internal deformation of the subducting Nazca plate. Deep-focus earthquakes in South America are not observed from a depth range of approximately 300 to 500 km. Instead, deep earthquakes in this region occur at depths of 500 to 650 km and are concentrated into two zones: one that runs beneath the Peru-Brazil border and another that extends from central Bolivia to central Argentina. These earthquakes generally do not exhibit large magnitudes. An exception to this was the 1994 Bolivian earthquake in northwestern Bolivia. This M8.2 earthquake occurred at a depth of 631 km, making it the largest deep-focus earthquake instrumentally recorded, and was felt widely throughout South and North America.
Subduction of the Nazca plate is geometrically complex and impacts the geology and seismicity of the western edge of South America. The intermediate-depth regions of the subducting Nazca plate can be segmented into five sections based on their angle of subduction beneath the South America plate. Three segments are characterized by steeply dipping subduction; the other two by near-horizontal subduction. The Nazca plate beneath northern Ecuador, southern Peru to northern Chile, and southern Chile descend into the mantle at angles of 25° to 30°. In contrast, the slab beneath southern Ecuador to central Peru, and under central Chile, is subducting at a shallow angle of approximately 10° or less. In these regions of “flat-slab” subduction, the Nazca plate moves horizontally for several hundred kilometers before continuing its descent into the mantle, and is shadowed by an extended zone of crustal seismicity in the overlying South America plate. Although the South America plate exhibits a chain of active volcanism resulting from the subduction and partial melting of the Nazca oceanic lithosphere along most of the arc, these regions of inferred shallow subduction correlate with an absence of volcanic activity. – Source: usgs.gov (1)
Terremoto de 7.3 en Colombia 30 septiembre 2012
Colombia Earthquake was predicted 3 days ago during a radio program.
For our Spanish readers:
“En el Minuto 2:51 se predice un fuerte terremoto, el dia domingo 30 de septiembre ocurre un Sismo de 7,3 grados de magnitud en el suroeste de Colombia”
“En el programa Mi primer cafe del dia jueves 27 de septiembre tambien se habia pronosticado un fuerte terremoto para el fin se semana. – Programa MI PRIMER CAFÉ con Omar Hejeile Jueves 27 de SEPTIEMBRE DE 2012 (Tramitido de lunes a viernes de 7:30am a 8:30pm por Radio Unica de Todelar)” (2)
Para escuchar el programa: http://www.youtube.com/watch?v=7fU_Diexz3o
(3)Video original: http://www.youtube.com/watch?v=9Ug6YSWYKl8 – Cortesía de: https://twitter.com/CristhianRVlogs
* Location and Magnitude contributed by: USGS National Earthquake Information Center – The publishing of this image does not imply that the author endorse this article.
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