Active volcanoes / Aktive vulkaner:

Anak Krakatau, Indonesia

(Foto via SWVRC)

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

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..

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.

 The Ecological Lessons Of The Explosion At Krakatau


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