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Posts Tagged ‘San Miguel volcano’

A Family Photo of Volcanoes, El Salvador

Posted by feww on April 26, 2010

Stratovolcanoes near Usulután, El Salvador

(L to R) Usulután: Formed during Holocene (an ongoing geological epoch that began about 12,000 years ago).  El Tigre formed during the Pleistocene Epoch (2.588 million to about 12,000 years ago), probably the oldest of member of the family captured in this astronaut photograph. The summit crater of El Tigre has eroded. Chinameca Volcano (also known as El Pacayal) has a two-kilometer-wide caldera formed after a powerful eruption caused its dome to collapse. San Miguel (also known as Chaparrastique), the youngest member of the family, is  situated about 15 km southwest of the city of San Miguel, where it takes its name from. It’s  one of the most active volcanoes in el Salvador and last erupted in 2002.  (Source of Photo: NASA. Astronaut photograph ISS023-E-22411 was acquired on March 31, 2010).

Terrestrial photos [click images to enlarge]

Usulután volcano rises above the Pacific coastal plain at the SE end of a cluster of stratovolcanoes between San Vicente and San Miguel volcanoes. The flanks of the forested Usulután volcano are dissected, but youthful lava flows are present on its southern flanks. The younger summit rocks of 1449-m-high Usulután and Cerro Nanzal pyroclastic cone on the lower SE flank were mapped as Holocene (Weber and Wiesemann, 1978). A broad 1.3-km-wide crater is breached to the east from the summit of Usulután to its lower flank. Several large erosional craters cut the flanks of Usulután, including the valley seen in this view cutting the SW flank. The rounded peak at the left is the young cone of Cerro Oromontique on the margin of El Tigre volcano. Photo by Lee Siebert, 1999 (Smithsonian Institution). Caption Global Volcanism Program (GVP).

The dissected Pleistocene volcano El Tigre is seen here from the NW on the flanks of Tecapa volcano with the town of Santiago de María at the left center. Two Holocene cones, symmetrical Cerro Oromontique in the center of the photo and Cerro la Manita, the small peak on the right horizon, were erupted along a NW-SE-trending fissure cutting the flanks of El Tigre volcano. Photo by Kristal Dorion, 1994 (U.S. Geological Survey). Caption: GVP.

Chinameca stratovolcano is seen here from the SE near the summit of neighboring San Miguel volcano. A 2-km-wide, steep-sided caldera, Laguna Seca el Pacayal (right-center), truncates the summit of Chinameca volcano. The Holocene cone of Cerro el Limbo (in the partial shade left of the caldera) on the western flank rises to a point above the level of the caldera rim. A group of fumarole fields is located on the north flank of the volcano near the town of Chinameca, and the volcano has been the site of a geothermal exploration program. Photo by Lee Siebert, 1999 (Smithsonian Institution). Caption: GVP.

Symmetrical San Miguel volcano towers 2000 m above a barren basaltic lava flow erupted from a SE-flank vent in 1819. The conical volcano is not the highest volcano in El Salvador, but is one of the most prominent, since it rises from near sea level on the Pacific coastal plain. San Miguel (also known as Chaparrastique) is one of the most active volcanoes of El Salvador, with more than two dozen eruptions recorded since the beginning of the Spanish era.  Photo by Carlos Pullinger, 1996 (Servicio Nacional de Estudios Territoriales, El Salvador). Caption: GVP

For more info on the above volcanoes see: Volcanoes of México and Central America

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Posted in volcanic activity, volcanic eruption, volcanic event, volcanic genie, volcanic hazard | Tagged: , , , , , , | 2 Comments »

VolcanoWatch Weekly [23 July 2009]

Posted by feww on July 23, 2009

Volcanic Activity Report: 15 July – 21 July 2009

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

VOW: Revisiting Mount Tambora Volcano, Sumbawa Island, Indonesia

On April 10, 1815, the Tambora Volcano produced the largest eruption in recorded history. An estimated 150 cubic kilometers (36 cubic miles) of tephra—exploded rock and ash—resulted, with ash from the eruption recognized at least 1,300 kilometers (808 miles) away to the northwest. While the April 10 eruption was catastrophic, historical records and geological analysis of eruption deposits indicate that the volcano had been active between 1812 and 1815. Enough ash was put into the atmosphere from the April 10 eruption to reduce incident sunlight on the Earth’s surface, causing global cooling, which resulted in the 1816 “year without a summer.”

This detailed astronaut photograph depicts the summit caldera of the volcano. The huge caldera—6 kilometers (3.7 miles) in diameter and 1,100 meters (3,609 feet) deep—formed when Tambora’s estimated 4,000-meter- (13,123-foot) high peak was removed, and the magma chamber below emptied during the April 10 eruption. Today the crater floor is occupied by an ephemeral freshwater lake, recent sedimentary deposits, and minor lava flows and domes from the nineteenth and twentieth centuries. Layered tephra deposits are visible along the northwestern crater rim. Active fumaroles, or steam vents, still exist in the caldera.

In 2004, scientists discovered the remains of a village, and two adults buried under approximately 3 meters (nearly 10 feet) of ash in a gully on Tambora’s flank—remnants of the former Kingdom of Tambora preserved by the 1815 eruption that destroyed it. The similarity of the Tambora remains to those associated with the AD 79 eruption of Mount Vesuvius has led to the Tambora site’s description as “the Pompeii of the East.”

Astronaut photograph ISS020-E-6563 was acquired on June 3, 2009  [photo caption said acquired March 6, 2009] , with a Nikon D3 digital camera fitted with an 800 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center. The image was taken by the Expedition 20 crew. The image in this article has been cropped and enhanced to improve contrast. Lens artifacts have been removed. The International Space Station Program supports the laboratory to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public, and to make those images freely available on the Internet. Additional images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth. Caption by William L. Stefanov, NASA-JSC.

New activity/unrest:

Ongoing Activity:

  • Bagana, Bougainville
  • Barren Island, Andaman Is
  • Batu Tara, Komba Island (Indonesia)
  • Chaitén, Southern Chile
  • Egon, Flores Island (Indonesia)
  • Ibu, Halmahera
  • Kilauea, Hawaii
  • Makian, Halmahera
  • Rabaul, New Britain
  • Sarychev Peak, Matua Island
  • Semeru, Eastern Java (Indonesia)
  • Shiveluch, Central Kamchatka (Russia)
  • Suwanose-jima, Ryukyu Islands (Japan)

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Posted in Batu Tara, Chaiten, Komba Island, Sakura-jima, Sarychev Peak | Tagged: , , , , , | 2 Comments »