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Posts Tagged ‘Chile Ridge’

Nazca Plate Subduction Probably Accelerating

Posted by feww on September 28, 2010

More Megaquakes, More Volcanic Activity Along Atacama Trench, Chile Ridge


NAZCA Plate. Source: NOAA

The Nazca Plate, an oceanic tectonic plate, located in the eastern Pacific Ocean basin off the coast of South America (Peru and Chile), subducts the South American Plate along the Peru-Chile Trench.  Existing as an independent plate, the Nazca Plate interacts with the Pacific Plate to the west and the Antarctic Plate to the south via the East Pacific Ridge and the Chile Ridge.


Peru-Chile Trench.
Source: NOAA


Chile Ridge. Source: NOAA


Peteroa Volcano,  part of the Andean Planchón-Peteroa Volcanic complex on the border between Chile and Argentina, spewed  ash on September 26, 2010, following an eruption on September 6. The natural-color satellite image above was captured by ALI aboard EO-1. Source: NASA E/O. Click image to enlarge. Download large image (4 MB, JPEG)

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    Posted in Andean orogeny, earthquake, Nazca Plate, Peteroa Volcano, Planchón-Peteroa Volcanic complex, volcano | Tagged: , , | Leave a Comment »

    Chaitén Still Awake!

    Posted by feww on September 29, 2009

    Chaitén: A New Phase of Activity?

    On June 29, 2009, after a magnitude 5.3 quake struck off coast of Isen, Chile, at a depth of 10km, the Moderators forecast:

    FEWW believes that the quake could be followed by more shocks, a number of which could be larger in magnitude, along the Chile Ridge, near the coast of Chile and about the subducting Nazca Plate. Additional seismic activity in the region could result in a new, more intense phase of activity in Chaitén, or prime other regional volcanoes for eruption.

    Well, Chaitén is still awake, doing what volcanoes do best: Spewing ash, steam, sulfur…

    Ash and Steam Plume from Chaitén

    chaiten_ali_2009270
    The Advanced Land Imager (ALI) aboard the NASA/USGS Earth Observing-1 (EO-1) satellite acquired this natural color image of Chaitén on September 27, 2009, at roughly 10:30 am local time.  According to a report, there was an ash plume extending 56 km (35 miles) northwest of the summit at the time the image was taken.
    NASA image by Robert Simmon, using EO-1 ALI data provided courtesy of the NASA EO-1 team. Caption by Robert Simmon. [Edited by FEWW]

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    Posted in Chaiten, Chaiten volcano, obduction, oceanic tectonic plate, orogeny. Tagged: block rotation, Plate Tectonics | Tagged: , , , , , , | Leave a Comment »

    Chaitén: A New Phase of Activity?

    Posted by feww on June 29, 2009

    Magnitude 5.3 quake strikes off the coast of Isen, Chile

    A magnitude 5.3 quake struck off coast of Isen, Chile, at a depth of 10km on Monday. FEWW believes that the quake could be followed by more shocks, a number of which could be larger in magnitude, along the Chile Ridge, near the coast of Chile and about the subducting Nazca Plate. Additional seismic activity in the region could result in a new, more intense phase of activity in Chaitén, or prime other regional volcanoes for eruption.

    Chaitén volcano as seen from the city of Chaitén (May 5, 2008)


    Chaitén volcano ejects a plume of ash as seen from the city of Chaitén, 1,200km south from Santiago, Chile, on May 5, 2008. (ALVARO VIDAL/AFP/Getty Images). Image may be subject to copyright.

    Earth’s Tectonic Plates with their movement vectors.


    Detailed world map in English showing the tectonic plates with their movement vectors. For licensing details see: Attribution and Share-Alike

    World geologic provinces


    Source: USGS

    Magnitude 5.3 OFF COAST OF AISEN, CHILE

    Magnitude: 5.3
    Date-Time: Monday, June 29, 2009 at 03:07:32 UTC
    Location:  45.619°S, 76.605°W
    Depth: 10 km (6.2 miles) set by location program
    Region:  OFF THE COAST OF AISEN, CHILE
    Distances:

    • 355 km (220 miles) W of Coihaique, Chile
    • 385 km (240 miles) SW of Castro, Chile
    • 1440 km (900 miles) SSW of SANTIAGO, Chile

    Location Uncertainty: horizontal +/- 13.5 km (8.4 miles); depth fixed by location program
    Parameters: NST= 40, Nph= 40, Dmin=733.6 km, Rmss=1.54 sec, Gp=133°, M-type=body wave magnitude (Mb), Version=6
    Source: USGS NEIC (WDCS-D)
    Event ID: us2009ilah

    Earthquake Location

    us2009ilah

    Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Source: USGS.

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    Posted in COAST OF ISEN, Nazca Plate, oceanic tectonic plate, orogeny, Plate Tectonics | Tagged: , , , , | 1 Comment »