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Archive for October 25th, 2009

Tao-Rusyr Caldera

Posted by feww on October 25, 2009

Tao-Rusyr Caldera, Onekotan Island, Kuril Islands, Kamchatka Peninsula, Russia

Latitude: 49.35°N 49°21’0″N
Longitude: 154.70°E 154°42’0″E

onekotan_ali_2009161
The huge Tao-Rusyr caldera on southern Onekotan Island is one of the most spectacular volcanoes of the Kuril Islands off the southern tip of Russia’s Kamchatka Peninsula.  The 7.5-km-wide caldera was formed about 7500 years ago during a catastrophic volcanic eruption, one of the largest Holocene eruptions in the Kuril Islands. Today, the basaltic-to-andesitic ancient Tao-Rusyr Caldera is filled by the deep blue waters of Kal’tsevoe Lake, whose surface is 400 m above sea level.

A large symmetrical post-caldera cone, 1325-m-high andesitic Krenitzyn Peak, forms a 4-km wide island that towers high above the caldera rim and fills the NW portion of the caldera lake. A 350-m-wide, 100-m-deep crater truncates the peak and a large lateral crater is located on the upper NE side.

The Advanced Land Imager (ALI) on NASA’s Earth Observing-1 (EO-1) satellite acquired this true-color image of southern Onekotan on June 10, 2009. In this late-spring shot, snow or ice lingers on the land, forming white streaks on a brown-and-green land surface. In the northwest quadrant of the caldera is Krenitzyn Peak, which rises to a height of 1,325 meters (4,347 feet).

Like the other Kuril Islands, Onekotan lies along the Pacific Ring of Fire. The Kuril Island volcanoes are fueled by magma generated by the subduction of the Pacific Plate under the Eurasian Plate, which takes place along a deep trench about 200 kilometers (120 miles) to the islands’ east. The only historical eruption at Krenitzyn Peak occurred in 1952, a week after a magnitude 9.0 earthquake along the subduction fault.

NASA Earth Observatory image created by Robert Simmon, using EO-1 ALI data provided courtesy of the NASA EO-1 team. Caption by Michon Scott and Rebecca Lindsey. [Additional information from GVP. Edited by FEWW]

Tao-Rusyr Caldera
A large symmetrical post-caldera cone, 1325-m-high Krenitzyn Peak, forms a 4-km wide island that towers above the rim of 7.5-km-wide Tao-Rusyr caldera. A 350-m-wide crater caps the peak, and a large shallow lateral crater (left center) is located on the upper NE flank. The small dark mass along the eastern shoreline (right-center) is a lava dome that was emplaced in 1952 during the only historical eruption of the volcano. Kal’tsevoe lake fills a caldera that was formed about 7500 years ago during one of the largest Holocene eruptions in the Kuril Islands. Photo by Oleg Volynets (Institute of Volcanology, Petropavlovsk). Caption: GVP.

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FEWW Volcanic Activity Forecast


Posted in Eurasian Plate, Holocene eruption, Kal’tsevoe Lake, Krenitzyn Peak, Pacific Plate, Pacific Ring of Fire | Tagged: , , , , | 1 Comment »

Powerful Earthquake Strikes Banda Sea

Posted by feww on October 25, 2009

Powerful Quake Measuring up to 7.3 Magnitude Strikes Banda Sea

A powerful earthquake measuring up to 7.3 Mw struck Banda Sea about 40 km WNW of Serua volcano and 65 km south of Manuk volcano, on Saturday, October 24, 2009 at 14:41 UTC.

The quake occurred at 6.161°S, 130.346°E, some 230 km  NNW of Saumlaki, Tanimbar Islands, Indonesia, at a depth of about 140 km. It was followed by a moderate quake measuring up to 5.3 Mw, which struck at 6.749°S, 131.601°E, on Sunday, October 25, 2009 at 00:35:06 UTC.

On February 21, 1938, a large quake measuring M 8.5 struck about 185 km northeast of Saturday’s quake  at a depth of 25km.

FEWW Forecast:

Based on an analysis of seismic activity in the region, FEWW Moderators believe a large earthquake measuring up to M 8.6 could strike Banda Sea in the next 3 – 6 months. Additional events measuring 6.0 to 7.6 Mw could also be expected in the region, anytime.

See also Earthquake Forecast: Timor Sea

10-degree Map Centered at 5°S,130°E

banda sea 25-10-09
Earthquake Location Map. Source: USGS/EHP. Enhanced by FEWW

Tsunami Warning:

This earthquake was located too deep inside the earth to generate a destructive tsunami in the Indian ocean, NOAA PTWC said.

Earthquake Details

  • Magnitude:  [7.3 Mw – estimated by FEWW]
  • Date-Time:
    • Saturday, October 24, 2009 at 14:40:44 UTC
    • Saturday, October 24, 2009 at 11:40:44 PM at epicenter
  • Location: 6.161°S, 130.346°E
  • Depth: 138.5 km (86.1 miles)
  • Region: BANDA SEA
  • Distances:
    • 230 km (145 miles) NNW of Saumlaki, Tanimbar Islands, Indonesia
    • 365 km (225 miles) SE of Ambon, Moluccas, Indonesia
    • 700 km (435 miles) N of DARWIN, Northern Territory, Australia
    • 2610 km (1620 miles) E of JAKARTA, Java, Indonesia
  • Location Uncertainty:  horizontal +/- 6.6 km (4.1 miles); depth +/- 9.2 km (5.7 miles)
  • Source:USGS NEIC (WDCS-D)
  • Event ID: us2009ndan

Population Exposure:

Overall, the population in this region resides in structures that are vulnerable to earthquake shaking, though some resistant structures exist. A magnitude 6.6 earthquake 360 km Northwest of this one struck Indonesia on March 12, 1983 (UTC), with estimated population exposures of 126,000 at intensity VII and 204,000 at intensity VI, with no reported fatalities. On June 17, 1987 (UTC), a magnitude 7.1 earthquake 82 km Northeast of this one struck Indonesia, with estimated population exposures of 1,000 at intensity VI and 82,000 at intensity V, with no reported fatalities. Source: USGS/EHP

Estimated Population Exposed to Earthquake Shaking

Historic Seismicity

neic_ndan_7 25-10-09
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

neic_ndan_w - SeisHaz 25-10-09
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Related Links:

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