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09:34 PM
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7.4 in Colombia
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[quote:Anonymous Coward 24683520:MV8yMDA0Mzg4XzMzNjc3MzE5Xzc4MzJENUU=] The Following was posted on Volcano Cafe, the USGS link for the information was not posted by him... Renato Rio says: September 30, 2012 at 18:28 USGS: “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 S. A, having begun its decent into the mantle at the S.A. 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 S. A. 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 S. A. plate at a rate of approximately 60 mm/yr.” http://volcanocafe.wordpress.com/2012/09/29/katla-and-volcanic-weekend-riddles/#comments [/quote]
Original Message
Maybe EAT was right, 7.4 is pretty big but it was a deep one.
[
link to earthquake.usgs.gov
]
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