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Archive for the ‘Krakatau’ Category

Krakatau Powers On

Posted by feww on November 23, 2010

Indonesia’s Krakatau: The Unfinished Story


Anak Krakatau ejects a thick plume of ash, steam and volcanic gases on November 17, 2010. This true-color image was acquired by NASA’s ALI on EO-1 as the activity at the volcano was beginning to wane. Source: NASA-EO


Mt Krakatau, Sinabung and Merapi Volcanoes Location Map
. Source of the original map: USGS. Map enhanced by Fire-Earth. Click image to enlarge.


Krakatau Islands Location Map. Original map enhanced by Fire-Earth.

island map
The Island Map (Simkin and Fiske, 1983). Image may be subject to copyright.

landsat PP1
Krakatau Image by Landsat Pathfinder Project (Dated May 18, 1992)

ashcroft -riv thames
William Ashcroft painting “On the Banks of the River Thames” in London, November 26, 1883 [Exactly three months after Krakatoa’s cataclysmic 1883 eruption.]

The Krakatoa eruption affected the climate driving the weather patterns wild for the next 5 years. Average global temperatures fell by about 1.2 °C in the following years, returning to normal only in 1888.

The violent explosions [August 27, 1883]

Krakatoa is a volcanic island in the Sunda Strait located between Indonesian islands of Java and Sumatra. Both the volcano and island group share the same name.

Four enormous explosions almost entirely destroyed Krakatoa island on August 27, 1883. The violent explosions were reportedly heard in Perth, Western Australia,  some 3,500 km away. It was heard even on the island of Rodrigues near Mauritius, about 4,800 km away.

The shockwave from the last explosion, which ejected volcanic matter 80 km into the atmosphere, echoed around the planet seven times.

Karakatoa
An 1888 lithograph of the 1883 violent explosion of Krakatau.

The eruption ejected about 21 cubic kilometers of volcanic matter and completely destroyed two-thirds of the Krakatoa island.

Related Links:

Latest Entries on Mt Merapi

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FEWW Volcanic Activity Forecast

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Posted in Anak Krakatau, Krakatau, Krakatau explosion, volcano, volcano images | Tagged: , , , | 1 Comment »

3 Explosions Heard at Krakatau Volcano

Posted by feww on November 14, 2010

More Volcanic Unrest in Indonesia

Villagers flee after Krakatau explodes 3 times


Krakatau Erption in 2008. Credit: Thomas.Schiet. Click image to enlarge.

About 1,000 Villagers fled the area after three loud explosions were heard from Mount Anak Krakatau, reports say.

“We received information that the number of earthquakes increased to 933 on Friday. This is harmless as long as the villagers still stay at least two kilometers away,” Anto Pambudi, head of the team observing Mt. Anak Krakatau said.

The alert status for the volcano has now been raised to “caution.”


Mt Krakatau, Sinabung and Merapi Volcanoes Location Map
. Source of the original map: USGS. Map enhanced by Fire-Earth. Click image to enlarge.


Krakatau Islands Location Map. Original map enhanced by Fire-Earth.

island map
The Island Map (Simkin and Fiske, 1983). Image may be subject to copyright.

landsat PP1
Krakatau Image by Landsat Pathfinder Project (Dated May 18, 1992)

ashcroft -riv thames
William Ashcroft painting “On the Banks of the River Thames” in London, November 26, 1883 [Exactly three months after Krakatoa’s cataclysmic 1883 eruption.]

The Krakatoa eruption affected the climate driving the weather patterns wild for the next 5 years. Average global temperatures fell by about 1.2 °C in the following years, returning to normal only in 1888.

The violent explosions [August 27, 1883]

Krakatoa is a volcanic island in the Sunda Strait located between Indonesian islands of Java and Sumatra. Both the volcano and island group share the same name.

Four enormous explosions almost entirely destroyed Krakatoa island on August 27, 1883. The violent explosions were reportedly heard in Perth, Western Australia,  some 3,500 km away. It was heard even on the island of Rodrigues near Mauritius, about 4,800 km away.

The shockwave from the last explosion, which ejected volcanic matter 80 km into the atmosphere, echoed around the planet seven times.

Karakatoa
An 1888 lithograph of the 1883 violent explosion of Krakatau.

The eruption ejected about 21 cubic kilometers of volcanic matter and completely destroyed two-thirds of the Krakatoa island.

Related Links:

Latest Entries on Mt Merapi

More Volcano Links

FEWW Volcanic Activity Forecast

Other Related Links:

Posted in Indonesia volcanoes, Krakatau, Krakatau explosion, volcanic earthquake, Volcanic Explosions, volcanic unrest | Tagged: , , , | Leave a Comment »

Volcano Watch Weekly [6 May 2009]

Posted by feww on May 7, 2009

Volcanic Activity Report: 29 April – 5 May 2009

Source: Global Volcanism program (GVP) – SI/USGS Weekly Volcanic Activity Report

New activity/unrest:

VoW: Atitlán

Country:  Guatemala
Volcano Type:  Stratovolcano
Volcano Status:  Historical
Last Known Eruption: 1853
Summit Elevation: 3,535 m  (11,598 feet)
Latitude: 14.583°N  (14°34’58″N)
Longitude: 91.186°W  (91°11’11″W)


Volcán Atitlán is one of several prominent conical stratovolcanoes in the Guatemalan highlands. Along with its twin volcano Tolimán to the north, it forms a dramatic backdrop to Lake Atitlán, one of the scenic highlights of the country. The 3535-m-high summit of Atitlán directly overlies the inferred margin of the Pleistocene Atitlán III caldera and is the highest of three large post-caldera stratovolcanoes constructed near the southern caldera rim. The volcano consequently post-dates the eruption of the voluminous, roughly 85,000-year-old rhyolitic Los Chocoyos tephra associated with formation of the Atitlán III caldera. The historically active andesitic Volcán Atitlán is younger than Tolimán, although their earlier activity overlapped. In contrast to Tolimán, Atitlán displays a thick pyroclastic cover. The northern side of the volcano is wooded to near the summit, whereas the upper 1000 m of the southern slopes are unvegetated. Predominantly explosive eruptions have been recorded from Volcán Atitlán since the 15th century. Photo by Bill Rose, 1980(Michigan Technological University). Caption GVP.

Major Volcanoes of Guatemala

REPORT:
Volcanic Hazards at Atitlán Volcano, Guatemala

—J.M. Haapala, R. Escobar Wolf, J.W. Vallance, W.I. Rose, J.P. Griswold, S.P. Schilling, J.W. Ewert, and M. Mota, 2006
Volcanic Hazards at Atitlán Volcano, Guatemala U.S. Geological Survey Open-File Report 2005-1403

Introduction

Atitlán Volcano is in the Guatemalan Highlands, along a west-northwest trending chain of volcanoes parallel to the mid-American trench. The volcano perches on the southern rim of the Atitlán caldera, which contains Lake Atitlán. Since the major caldera-forming eruption 85 thousand years ago (ka), three stratovolcanoes—San Pedro, Tolimán, and Atitlán—have formed in and around the caldera. Atitlán is the youngest and most active of the three volcanoes. Atitlán Volcano is a composite volcano, with a steep-sided, symmetrical cone comprising alternating layers of lava flows, volcanic ash, cinders, blocks, and bombs.

Eruptions of Atitlán began more than 10 ka and, since the arrival of the Spanish in the mid-1400’s, eruptions have occurred in six eruptive clusters (1469, 1505, 1579, 1663, 1717, 1826–1856). Owing to its distance from population centers and the limited written record from 200 to 500 years ago, only an incomplete sample of the volcano’s behavior is documented prior to the 1800’s. The geologic record provides a more complete sample of the volcano’s behavior since the 19th century. Geologic and historical data suggest that the intensity and pattern of activity at Atitlán Volcano is similar to that of Fuego Volcano, 44 km to the east, where active eruptions have been observed throughout the historical period.

Because of Atitlán’s moderately explosive nature and frequency of eruptions, there is a need for local and regional hazard planning and mitigation efforts. Tourism has flourished in the area; economic pressure has pushed agricultural activity higher up the slopes of Atitlán and closer to the source of possible future volcanic activity. This report summarizes the hazards posed by Atitlán Volcano in the event of renewed activity but does not imply that an eruption is imminent. However, the recognition of potential activity will facilitate hazard and emergency preparedness. [Report Menu]

Ongoing Activity:

Latest U.S. Volcano Alerts and Updates for Wednesday, May 6, 2009 at 17:51:20 PDT

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Posted in Bagana, Krakatau, Redoubt, Rinjani, Shiveluch | Tagged: , , , , | Leave a Comment »