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Posts Tagged ‘Punta Arenas’

M7.8 Quake Strikes Scotia Sea

Posted by feww on November 17, 2013

Quake Likely Generated a Local Tsunami —FIRE-EARTH

The powerful quake follows an earlier shock measuring 6.8Mw which struck Scotia Sea centered at 60.213°S 47.108°W on November 16.

There are No official Tsunami Warnings, Advisories or Watches in effect, as of posting.

Earthquake Details

  • Event Time:2013-11-17  at 09:04:55 UTC
  • Location: 60.296°S 46.362°W
  • Depth: 10.0km (6.2mi)
  • Nearby Cities
  • 893km (555mi) SW of Grytviken, South Georgia and the South Sandwich Islands
    • 1440km (895mi) SE of Ushuaia, Argentina
    • 1686km (1048mi) SE of Punta Arenas, Chile

scotia sea - 17nov2013
Earthquake Location Map. Source: USGS/EHP. Map enhanced by FIRE-EARTH Blog. The quake was followed by at least one significant aftershock, measuring 5.3Mw, as of posting.

Tectonic Summary

The November 17, 2013 earthquake in the Scotia Sea, to the northwest of the South Orkney Islands, occurred as the result of either left-lateral strike slip faulting on an east-west oriented plane, or right-lateral faulting on a north-south plane. The location of the event adjacent to the east-west oriented plate boundary between the Antarctica and Scotia Sea plates implies the left-lateral faulting scenario is most likely. At the latitude of this earthquake, the Antarctica plate moves eastwards with respect to the Scotia Sea plate at a velocity of 6 mm/yr.

The November 17 earthquake is the latest in a series of moderate-to-large earthquakes to strike the same region over the past several days. The sequence began with a M 6.1 event on November 13 approximately 50 km to the west of the November 17 quake. On November 15, a M 6.8 earthquake struck very close to the preceding M 6.1. Since then, 9 aftershocks have been recorded in the area, ranging from M 4.7 to M 5.4, both near the previous earthquakes and in the same approximate location as the November 17 event.

Though the region surrounding the Scotia Sea is familiar with earthquakes, the majority occur around the subduction zone adjacent to the South Sandwich Islands, to the east of the November 17 earthquake. Just two events of M6 or greater have occurred within 250 km of this earthquake over the past 40 years – a M 6.0 230 km to the west in September 1979, and a M 7.6 160 km to the east in August 2003. These two events involved normal and oblique-normal faulting, respectively, associated with the same plate boundary. Neither is known to have caused damage or fatalities. [Source: USGS/EHP]

Details of November 16 Foreshock

  • Time: 2013-Nov-16 at 03:34:31
  • Location: 60.213°S 47.108°W
  • Depth: 10.0km

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Chaitén’s Fury Ending?

Posted by feww on May 31, 2008

Chaitén Update # 3

Is Weary Chaitén Ready to Rest?

Chaitén continues to erupt, although a decline in the height of eruption column in the last two days has been reported. A decline also in its seismic activity is reducing the probability of larger explosive eruptions, though they are not entirely ruled out.

Air Lines Resume Flights Over Central and Southern Chile

Airlines resumed flights to most of southern Chile airports on Thursday after they were briefly suspended because of the high concentration of ash in the atmosphere.

Flights to Puerto Montt and Temuco remain on stand by until further notice; however, flights to Punta Arenas and Balmaceda have resumed.

Chaitén volcano started erupting May 2, after at least 9,000 years of dormancy.

Typical eruption column of Chaiten Volcano, Chile, on May 26, 2008, between stronger explosive activity. The circular caldera rim is 3 km (1.9 miles) in diameter, which was formed about 9,400 years ago. A lava dome that erupted sometime later is the knobby feature between the billowing ash and rim on the left. A new lava dome is growing in the caldera but it is out of view behind eruption column. U.S. Geological Survey photograph by J.N. Marso. Caption: Hawaiian Volcano Observatory.

Cerro Azul Volcano Erupts

Meanwhile the 1,700-meter high Cerro Azul volcano erupted on Thursday after 10 years of inactivity. Cerro Azul is located on Isabela, the largest of the Galapagos islands.

Cerro Azul volcano at the SW tip of Isabela Island. Photo by Tom Simkin (Smithsonian Institution). Image Maty be subject to copyright. See FEWW Fair Use Notice!

The Galápagos archipelago, a province of Ecuador, has a population of around 40,000 and is located the eastern Pacific Ocean at 525 nautical miles (972 km/604 miles) off the west coast of South America. The sparsely archipelago is home to “Galápagos,” the Spanish name for the Giant Land Tortoises that inhabit the islands.

Satellite photo of the Galápagos islands (names of the visible main islands are overlayed).

Unlike the 1998 Cerro Azul eruption in which several giant tortoise were destroyed by molten lava, despite a rescue operation by helicopters, it is thought that the current eruption poses no danger to the animals.

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