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Posts Tagged ‘Sumbawa Island’

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]

Posted in earthquake forecast, Earthquakes, feww earthquake forecast, Indonisia earthquakes, seismic activity report, seismic hazard report | Tagged: , , , , , , , , , | 1 Comment »

VolcanoWatch Weekly [2 September 2009]

Posted by feww on September 5, 2009

Supervolcanoes may awaken

VOW: Mt Tambora

Mt tambora indonesia
Photo: Mark Webster/Lonely Planet Images. Image may be subject to copyright.

Tambora Photo
Country:    Indonesia
Region:    Lesser Sunda Islands (Indonesia)
Volcano Type:     Stratovolcano
Last Known Eruption:     1967 ± 20 years
Summit Elevation:     2,850 m     (9,350 feet)
Latitude:     8.25°S
Longitude:     118.00°E
Source: GVP

Tambora volcano on Indonesia’s Sumbawa Island was the site of the world’s largest historical eruption in April 1815. This NASA Landsat mosaic shows the 6-km-wide caldera truncating the 2850-m-high summit of the massive volcano. Pyroclastic flows during the 1815 eruption reached the sea on all sides of the 60-km-wide volcanic peninsula, and the ejection of large amounts of tephra caused world-wide temperature declines in 1815 and 1816. NASA Landsat7 image ( Caption GVP.

Mount Tambora (or Tomboro) is an active stratovolcano on Sumbawa island, Indonesia. Sumbawa is flanked both to the north and south by oceanic crust, and Tambora was formed by the active subduction zones beneath it. This raised Mount Tambora as high as 4,300 m (14,000 ft), making it one of the tallest peaks in the Indonesian archipelago.

Tambora erupted in 1815 with a rating of seven on the Volcanic Explosivity Index, making it the largest eruption since the Lake Taupo eruption in about 180 AD. It was the largest volcanic eruption in recorded history. The explosion was heard on Sumatra island (more than 2,000 km  away). Heavy volcanic ash falls were observed as far away as Borneo, Sulawesi, Java and Maluku islands. Most deaths from the eruption were from starvation and disease, as the eruptive fallout ruined agricultural productivity in the local region. The death toll was at least 71,000 people (perhaps the most deadly eruption in history), of whom 11,000–12,000 were killed directly by the eruption. The eruption created global climate anomalies; 1816 became known as the Year Without Summer because of the effect on North American and European weather. Agricultural crops failed and livestock died in much of the Northern Hemisphere, resulting in the worst famine of the 19th century. (Source: Wikipedia; edited by FEWW)

SI /USGS Weekly Volcanic Activity Report
(26 August-1 September 2009)

New activity/unrest:

  • Kanlaon, Negros Island (central Philippines)
  • Kolokol Group, Urup Island  (Kurile Islands,Sakhalin Oblast region, Russia)
  • Koryaksky, Eastern Kamchatka, Russia

Ongoing Activity:

Related Links:

FEWW Links:

FEWW Volcanic Activity Forecast

Posted in Chaiten, Kanlaon, Kolokol Group, Koryaksky, Kīlauea, Popocatépetl, Shiveluch | Tagged: , , , , , | 1 Comment »