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.
------------------------------
November
23, 2011 10:00 PM EST
Is
the Anak Krakatau Volcano About to Blow?
Indonesia's Mount Anak Krakatau volcano has been
puffing white smoke the last few days, and scientists are
warning locals and tourists to keep away. That could mean that
the long suspected eruption of the world's most
famous volcano could be imminent.
Actually, this volcano is the remnant of the biggest blast ever
recorded on Earth. That was the 1883 eruption
of Mount Krakatoa. From the ruins of that gigantic crater left
in the land has come forth what is now known
as the Anak Krakatau volcano—literally "Krakatoa's Child."
In the time since the original eruption, scientists have gotten
much better at predicting when a volcano will have a catastrophic
eruption, distinguishing it from the many smaller eruptions which
do not harm the local population or environment. One of the telltale
signs is sudden and increased activity like what scientists are
seeing in this past
week at the Anak Krakatau volcano.
Of course, not wanting to take unnecessary chances, scientists
have to balance warning off residents with calling a
false alarm. That's why this recent warning is so significant.
Seismologists have learned to read the signs to an
astonishingly accurate degree and have a tremendous track record
for getting it right.
So, the world may be close to once again hearing the loudest
sound ever recorded.
by
Tom Rose
http://news.gather.com/viewArticle.action?articleId=281474980808531
Wednesday,
November 3rd, 2010
Increased volcanic activity is seen at Anak Krakatau. The volcano has
spewed toxic gas into the air.
Fishermen and tourists have been warned from being in the vicinity of
at least two kilometers off the volcano.
Frequent flows of toxic gas indicate that any eruption may occur in
no time.
Onsdag
3. november 2010.
Økt aktivitet merkes på Anak Krakatau. Vulkanen har spydd
giftig gass ut i luften.
Fiskere og turister er blitt advart om å være i nærheten,
og må holde seg minst 2 km fra vulkanen.
Hyppige gasutbrudd indikerer at et utbrudd kan komme når som helst.
S/V
Ohana Kai takes an up close look at Anak Krakatau and she delivers quite
an eruption!!! 10/23/07
This was a day after the first eruptions and we were on our way out
of the Caldera. We thought we would go
a little closer to get some video in better light and no rain or lighting
as there was the first morning.
Just as we got within a mile or so she let lose with an eruption that
shook the boat and you felt in your chest... http://www.youtube.com/watch?v=JmPuy-pqIQE&feature=related
Wednesday April 13th, 2005
Scientists raised the alert level on two more Indonesian volcanoes
on Wednesday, a day after
a volcanic eruption on disaster-stricken Sumatra
Island triggered the evacuation of some
25,000 people.
Sensors on the slopes of the two mountains -
Anak Krakatoa on the southern tip of Sumatra
Island and Tangkuban Prahu in Java
- picked up an increase in volcanic activity and a build up
of gases, said a government volcanologist.
Photo March 7th, 1999.
Anak Krakatau, 17.Mai, 1997.
Photo courtesy of Mike Lyvers.
Links:
The Ecological Lessons Of The Explosion At Krakatau
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