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Случайные фотографии
Current seismic signal San Salvador (GRDA station, SNET)
Wednesday, Jan 23, 2013
Видны небольшие вулканические землетрясения и слабый тремор сейсмограммы, но в пределах нормальных уровней для этого активного вулкана. [подробнее]
Thursday, Mar 22, 2012
Землетрясение магнитудой мексиканской 7.4 недалеко от Акапулько во вторник могли пострадать в настоящее время dormant вулкана Сан-Сальвадор в 1000 км и вызвали землетрясение Рой под Вулкан. ... [подробнее]
 

San Salvador вулкан

ВУЛКАН 1893 m / 6,211 ft
El Salvador, 13.73°N / -89.29°W
Текущее состояние: normal or dormant (1 из 5)
San Salvador Веб-камеры / данные в реальном времени | Reports
San Salvador volcano books
Last update: 23 Jan 2013
Типичный извержения стиль: effusive flank fissure eruptions
San Salvador Вулкан-извержения: 1917, 1806 (?), 1671, 1658, 1572 ± 2, ?1200, 640 AD ± 30 years Нет недавних землетрясений
ВремяМагнитный / ГлубинаРасстояниеМестоположение
San Salvador volcano is a massive stratovolcano immediately northwestwest of El Salvador city. Its modern summit cone is also called the Boqueron stratovolcano. It formed within a 6 km wide caldera left by the collapse of the predecessor volcano about 40,000 years ago. Remnants of the caldera rim form the Picacho and Jabalí peaks.
Boqueron volcano is truncated by a steep-walled, 500 m deep and 1500 m wide summit crater, which formed during a large eruption about 800 years ago. Before the last eruption in 1917, the crater of Boqueron contained a 400 m wide lake, which was replaced by a small, 30 m high young cinder cone, called Boqueroncito, built during the eruption along with a major lava flow on the north flank.
Most historical eruptions from San Salvador originated from flank vents.

Справочная информация:

The San Salvador or Quezaltepeque volcanic center formed in the southern part of the main graben of El Salvador and is dominantly andesitic. 3 fracture zones that extend beyond the base of San Salvador volcano have been the locus for numerous flank eruptions, including 2 that formed maars on the WNW and SE sides.
Most of the 4 historical eruptions recorded since the 16th century have originated from flank vents, including two eruptions in the 17th century from the NW-flank cone of El Playón, during which explosions and a lava flow damaged inhabited areas.

1999 unrest
A small seismic swarm occurred in August 1999, when volcano-tectonic earthquakes about 5 km from the crater were detected. No other signs of unrest were noted.

1917 eruption
The last eruption of San Salvador volcano began on 6 June 1917 following strong and destructive earthquakes lasting for 2 hours. The eruption consisted of an effusive fissure eruption on the NW flank followed by a moderately explosive summit eruption (similar, but smaller in scale, to the Eyafjallajökull eruption in 2010).
The effusive phase produced a large aa lava flow on the NW flank, left a row of cinder cones on the eruptive fissure, and lasted about a week. The second phase started simultaneously with the waning of the waning of the first phase from a fissure vent inside the summit crater. It quickly evaporated a former 400 m wide lake and built the small Boqueroncito cinder cone. ...БОЛЬШЕ

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