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PostSubject: Volcano's   Tue Jan 06, 2009 1:46 pm

Country:United States
Subregion Name:Aleutian Islands
Volcano Number:1101-161
Volcano Type: Stratovolcanoes
Volcano Status:Historical
Last Known Eruption:
Summit Elevation: 1533 m 5,029 feet
Latitude: 52.381°N 52°22'52"N
Longitude: 174.154°W 174°9'15"W
Korovin, the most frequently
active volcano of the large volcanic complex at the NE tip of Atka
Island, contains a 1533-m-high double summit with two craters located
along a NW-SE line. The NW summit has a small crater, but the 1-km-wide
crater of the SE cone has an unusual, open cylindrical vent of widely
variable depth that sometimes contains a crater lake or a high magma
column. A fresh-looking cinder cone lies on the flank of partially
dissected Konia volcano, located on the SE flank of Korovin. The
volcano is dominantly basaltic in composition, although some late-stage
dacitic lava flows are present on both Korovin and Konia.



Subregion Name:Fiji Islands
Volcano Number:0405-02-
Volcano Type: Cinder cones
Volcano Status:Holocene?
Last Known Eruption: Unknown
Summit Elevation: 522 m 1,713 feet
Latitude: 17.32°S 17°19'0"S
Longitude: 179.40°E 179°24'0"E
The 16 x 9 km,
shark-tooth-shaped Koro Island, located between Fiji's Viti Levu and
Vanua Levu Islands, is part of the volcanic Lomaiviti Islands. A chain
of basaltic cinder cones of upper Pleistocene or possibly Holocene age
extends from north to south along the crest of the island (Coulson,
1976). With the exception of one location on the west coast where young
lava flows reached the sea, the youngest lava flows, erupted from the
NNE-SSW-trending cinder cone chain, are confined to the central
plateau, where they form a flat, undissected lava field that extends
primarily to the east.

Subregion Name:Izu Islands (Japan)
Volcano Number:0804-03=
Volcano Type: Lava domes
Volcano Status:Historical
Last Known Eruption:
838 AD
Summit Elevation: 572 m 1,877 feet
Latitude: 34.216°N 34°12'58"N
Longitude: 139.156°E 139°9'23"E
A cluster of rhyolitic lava
domes and associated pyroclastic deposits form the small 4 x 6 km
island of Kozu-shima in the northern Izu Islands. Kozu-shima lies along
the Zenisu Ridge, one of several en echelon ridges oriented NE-SW,
transverse to the trend of the northern Izu arc. The youngest and
largest of the 18 lava domes, 574-m-high Tenjo-yama, occupies the
central portion of the island. Most of the older domes, some of which
are Holocene in age, flank Tenjo-yama to the north, although
late-Pleistocene domes are also found at the southern end of the
island. Only two possible historical eruptions, from the 9th century,
are known. A lava flow may have reached the sea during an eruption in
832 AD. Tenjo-san lava dome was formed during a major eruption in 838
AD that also produced pyroclastic flows and surges. Earthquake swarms
took place at Kozu-shima during the 20th century.

Subregion Name:Indonesia
Volcano Number:0602-00=
Volcano Type: Caldera
Volcano Status:Historical
Last Known Eruption:
Summit Elevation: 813 m 2,667 feet
Latitude: 6.102°S 6°6'6"S
Longitude: 105.423°E 105°25'22"E
The renowned volcano Krakatau
(frequently misstated as Krakatoa) lies in the Sunda Strait between
Java and Sumatra. Collapse of the ancestral Krakatau edifice, perhaps
in 416 AD, formed a 7-km-wide caldera. Remnants of this ancestral
volcano are preserved in Verlaten and Lang Islands; subsequently
Rakata, Danan and Perbuwatan volcanoes were formed, coalescing to
create the pre-1883 Krakatau Island. Caldera collapse during the
catastrophic 1883 eruption destroyed Danan and Perbuwatan volcanoes,
and left only a remnant of Rakata volcano. This eruption, the 2nd
largest in Indonesia during historical time, caused more than 36,000
fatalities, most as a result of devastating tsunamis that swept the
adjacent coastlines of Sumatra and Java. Pyroclastic surges traveled 40
km across the Sunda Strait and reached the Sumatra coast. After a
quiescence of less than a half century, the post-collapse cone of Anak
Krakatau (Child of Krakatau) was constructed within the 1883 caldera at
a point between the former cones of Danan and Perbuwatan. Anak Krakatau
has been the site of frequent eruptions since 1927.

Subregion Name:Greece
Volcano Number:0102-03=
Volcano Type: Stratovolcanoes
Volcano Status:Radiocarbon
Last Known Eruption:
140 AD ± 300 years
Summit Elevation: 751 m 2,464 feet
Latitude: 36.699°N * 36°41'55"N
Longitude: 24.439°E 24°26'20"E
Mílos and adjacent small
islands have grown from submarine and subaerial volcanism that
initially was dominantly andesitic and basaltic, but ended with
predominately rhyolitic eruptions. The oldest volcanic rocks are
Pliocene submarine rhyolitic pyroclastic-flow deposits overlying
basement metamorphic and sedimentary rocks. The latest activity during
the late Pleistocene was concentrated in the eastern half of the low,
U-shaped Mílos Island, forming lava domes and phreatic explosion
craters, and on Antimílos Island to the NW, where a composite volcano
was constructed. The youngest magmatic eruptions took place about
90,000 years ago, but phreatic explosions, commonly producing
overlapping craters rarely more than 1 km in diameter, continued from
late-Pleistocene to Recent times. A lahar deposit in SE Mílos, east of
Fyriplaka tuff ring, buried walls of a Roman harbor town and overlies a
coarse ash layer, and was considered to originate from a small phreatic
explosion through basement rocks.

Subregion Name:Madagascar
Volcano Number:0303-012
Volcano Type: Cinder cones
Volcano Status:Holocene
Last Known Eruption: Unknown
Summit Elevation: 214 m 702 feet
Latitude: 13.32°S * 13°19'0"S
Longitude: 48.48°E 48°29'0"E
Nosy-Be island off the NW
coast of Madagascar contains very recent basaltic lava flows from
well-preserved cinder cones. Many large crater lakes are found in the
central part of the island. Nosy-Be volcanics, which are dominantly of
low-silica foiditic compositions, overlie Mesozoic limestones and other
sedimentary rocks. Two periods of activity occurred at Nosy-Be. Initial
eruptions of fluid lava flows from the western side of the massif were
followed by the construction of numerous strombolian cinder cones on
the western plain. Little is known about the age of the volcanic field,
and the only K-Ar dates are Tertiary in age, but the Nosy-Be volcanics
were mapped as Recent (Besairie, 1973).
Pulau Weh

Subregion Name:Sumatra (Indonesia)
Volcano Number:060101=A
Volcano Type: Stratovolcano
Volcano Status:Pleistocene-Fumarolic
Last Known Eruption: Pleistocene
Summit Elevation: 617 m 2,024 feet
Latitude: 5.82°N 5°49'0"N
Longitude: 95.28°E 95°17'0"E
Pulau Weh island off the NW
tip of Sumatra has been interpreted as the remains of a partially
collapsed older center breached to the NW and filled by the sea. Pulau
Weh was included in the Catalog of Active Volcanoes of the World
(Neumann van Padang 1951) based on its geothermal activity. Volcanism
was assumed to be of Pleistocene age (Bennett et al., 1981), but
fumaroles and hot springs are found a NW-E-trending line along the
summit of the island and near the western shore of Lhok Perialakot bay
on the northern side

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