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Posts Tagged ‘Volcanic Explosivity Index’

Powerful quake shakes Sumbawa, Indonesia

Posted by feww on November 8, 2009

M7.0 Earthquake Strikes Sumbawa, Indonesia

Powerful earthquake measuring up to 7.0Mw struck Indonesia’s Sumbawa region, about 77 km east of Tambora volcano and at an estimated  depth of 18 km, November 8, 2009 at 19:41 UTC.

Mount Tambora’s 1815 eruption (Volcanic  Explosivity Index of 7) was the largest in modern history, and perhaps the deadliest of all time, with up to an estimated 100,000 people losing their lives as a result.

Alarmed by its findings concerning the prospect of intense seismic activity in the region, FEWW featured Mt Tambora in its weekly volcano watch VolcanoWatch Weekly  dated 23 July 2009.

See also September 28, 2009 entry:  Up to 3 More Large EQs Could Strike the Pacific Ring of Fire in 2009

FEWW Moderators believe that further, intense seismic activity would most likely occur in the region in the near future.

10-degree Map Centered at 10°S,120°E

sumbawa - I
Earthquake location Map. Source: USGS/EHP. Enhanced by FEWW

Earthquake Details:

  • Magnitude: 6.7  [Maximum quake magnitude estimated by FEWW at 7.0 Mw]
  • Date-Time:
    • Sunday, November 08, 2009 at 19:41:44 UTC
    • Monday, November 09, 2009 at 03:41:44 AM at epicenter
  • Location: 8.316°S, 118.697°E
  • Depth: 18.3 km (11.4 miles) (poorly constrained)
  • Distances:
    • 15 km (10 miles) NNW of Raba, Sumbawa, Indonesia
    • 310 km (190 miles) ENE of Mataram, Lombok, Indonesia
    • 330 km (205 miles) W of Ende, Flores, Indonesia
    • 1335 km (830 miles) E of JAKARTA, Java, Indonesia
  • Location Uncertainty: horizontal +/- 9.3 km (5.8 miles); depth +/- 33 km (20.5 miles)
  • Source:  USGS NEIC (WDCS-D)
  • Event ID: us2009nta5

Tsunami Info:

NOAA Pacific Tsunami Warning Center Center issued the following evaluation:

A destructive widespread tsunami threat does NOT exist based on   historical earthquake and tsunami data.   However – there is a very small possibility of a local tsunami that could affect coasts located usually no more than a hundred kilometers from the earthquake epicenter. Authorities in the region near the epicenter should be made aware of this possibility.

Historic Seismicity

neic_nta5_7  indonesia 9Nov09
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green- USGS/EHP

Seismic Hazard Map

neic_nta5_w - 9Nov09

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

Related Links:

Other Related Links [Including FEWW forecasts]

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Bezymianny Volcano on Russia’s Kamchatka peninsula erupts

Posted by msrb on August 20, 2008

PETROPAVLOVSK-KAMCHATSKY. The Bezymianny Volcano on Russia’s Kamchatka peninsula has erupted, Itar-Tass reported.

During the period of unrest, it emitted an ash column with a diameter of about 100 km.

The eruption was forecast prior to the unrest. The Bezymianny Volcano (2,800m high) is one of 28 active volcanoes on the peninsula. Bezymianny erupts explosively once or twice each year. The eruptions can last up to several days.

During its most powerful eruption in 1956, Bezymianny dome exploded collapsing about 280m of its summit (reduced from 3080 to 2800m). It ejected about one cubic kilometer volcanic debris in a very short time. [See VEI below.]

Bezymianny Volcano on Russia’s Kamchatka peninsula. Photo: Itar-Tass. Image may be subject to copyright. See Fair Use Notice!

More …

Volcanic Explosivity Index (VEI)

The Volcanic Explosivity Index (VEI) was devised by Chris Newhall of the U.S. Geological Survey and Steve Self at the University of Hawaiʻi in 1982 to provide a relative measure of the explosiveness of volcanic eruptions.

VEI and ejecta volume correlation. Credit: USGS (Via Wikipedia)

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