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Archive for the ‘oceanic tectonic plate’ Category

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 »