Liquiñe-Ofqui Fault
Template:Short description Template:Infobox fault The Liquiñe-Ofqui Fault is major geological fault that runs a length of roughly Script error: No such module "convert". in a NNE-SSW orientation and exhibits current seismicity.[1][2] It is located in the Chilean Northern Patagonian Andes. It is a dextral intra-arc strike-slip fault.[2] Most large stratovolcanoes of the Southern Volcanic Zone of the Andes are aligned by the fault which allows for the movement of magma and hydrothermal fluids.[2]
The fault crosses several transverse faults including the Mocha-Villarrica Fault Zone (MVFZ) and the Biobío-Aluminé Fault Zone.[2] The fault has had periods of ductile deformation associated to pluton emplacement, be it either at great depths or by shallow intrusions.[3]
The forces that move the fault are derivative of the oblique subduction offshore Chile's coast. This leads to partition of deformation between the subduction zone, the fore-arc and the intra-arc region where the fault lies.[2] There is evidence that the fault broke as a Template:M9.07 subevent in the 1960 Valdivia earthquake.[4] A portion of the fault in Aysén Region likely slipped (moved) in an aftershock a few weeks after the 1960 Valdivia earthquake.[5] This same portion slipped again in April 2007, causing earthquakes in Aysén Fjord, triggering landslides and a local tsunami.[5]
The fault name was coined by Francisco Hervé, I. Fuenzalida, E. Araya and A. Solano in 1979.[6] The existence of the fault was first inferred by Chilean government agent Hans Steffen around 1900, who referred to it as a "tectonic furrow" (Spanish: surco tectónico).[6]
See also
References
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- Seismic faults of Chile
- Strike-slip faults
- Geology of Patagonia
- Geology of Araucanía Region
- Geology of Los Ríos Region
- Geology of Los Lagos Region
- Geology of Aysén Region
- Taitao Peninsula
- Mapuche language