Lava dome grows inside Anak Krakatau volcano – rattled by 438 quakes

March 28, 2012 INDONESIA – An active lava dome is growing inside the summit crater of Krakatau volcano. Our tour expedition leader Andi just returned from a visit and reports that the dome is now about 100 m wide, and has 2 main active vents that eject jets of incandescent gas. At night, the glow from the dome is clearly visible from Rakata and Sertung islands, and a continuous intense solfatara plume is rising about 500 m above the summit. Andi and our group observed also that there are now more and larger fumarole fields on the southern part of the cone. According to our observations and the opinion of local scientists, this area is inflated due to the pushing of the lava dome. The seismic recordings from the observatory of Krakatau also show an increase in activity. On 26 March, there were 138 volcanic-tectonic (A-type) earthquakes and 300 long-period (B-type) quakes alone. The question is how long the lava dome remains quiet and purely effusive in style. Explosive, also larger vulcanian-type ones, activity could occur any time. –Volcano Discovery
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16 Responses to Lava dome grows inside Anak Krakatau volcano – rattled by 438 quakes

  1. Dennis E. says:

    Hmmm, Is this not a close relative of another volcano with a similar name that lit up the world for about two days in the 1800’s? The blast heard around the world?


    • The Father has given birth to a son…his name is Anak and its the fastest growing strato-volcano in the world.


      • Garth Colin Whelan says:

        Anak simply means ‘child’. It is also the same in almost all Filipino dialects also.

        If I’m not mistaken, the original Krakatau volcano, had a vent, which caused sea water to pour into the magma, and then quickly evaporated inside the vent. The vent became filled with steam, and the pressure built up like a giant pressure cooker, and kept on building up until the walls of the vent could take no more. It literally caused the top of the mountain to blow up and be thrown into the sea. The explosion could be heard thousands of miles away, and created a massive tsunami. Anak Krakatau is simply part of the crater produced by that explosion.


      • You are correct. 12 square miles of the island disintegrated in the blast when the volcano blew itself to pieces in 1883. Anak began as a submarine volcanic eruption in 1927 and quickly built a cone in the preceding years.


  2. I wonder how close this is to the two quakes (4.8) that just struck south of Java


  3. Bone idle says:

    “Anak” is translated as child from Bahasa Indonesia.

    Anak Krakatau = Child of Krakatau.

    Anak is child. Anak anak (anak squared) are children.

    In reality Anak Krakatau is the grandchild of the Krakatau that massively erupted around 535.


  4. streams13 says:

    I am looking at the USGS site for Indonesia and cannot even find Anak Krakatau! I found Krakatau in all caps, but I cannot find Anak. Could you post a link to a map?
    This is fascinating, Alvin. Thanks for the post. Keep up the great work!
    Sadly, I am concerned that you are going to be much busier in the days ahead….
    Come quickly, Lord Jesus!


  5. Irene C says:

    I was just wondering, at it’s current size, if this blows like the father did, how bad would the blast and subsequent eruption be? Could it be as bad as the previous eruption?



    • It’s not as large as Krakatoa 1883, but East Java is believed to be the site of a magma plume. There is obviously deep plumbling in the Sunda Strait that snakes down into the mantle as Anak rose from the site. The earthquakes are increasing in the region and millions of people live within sight of Anak Krakatau which is growing at the rate of about 5 meters in height a year.


    • Bone Idle says:

      In terms of “Bad”. Tambora 1815 (East Indonesia) was 100 times more powerful than Krakatau 1883. Tambora was responsible for the “year without summer”.
      Historic Krakatau erupted around 535 and is thought to be linked with the downfall of the Roman empire and the start of the “Dark Ages”
      In recent historic periods large earthquakes are worse in terms of loss of life. In Europe tens of thousands were killed in Italy alone during the period 1900 – 1920 (another period of extreme earthquake activity).
      This could change as ever expanding large populations close to known volatile volcanos such as Mexico city and Naples become more at risk.


      • nickk0 says:

        Regarding the explosion of ‘historic’ Krakatau in approx.535 AD – Author David Keys in his book, ‘Catastrophe’, postulated that this explosion led not only to the downfall of the Roman Empire….. but a host of others, too.
        VERY interesting – and probably right on the money, too.


  6. Katarina v W says:

    Interested in updates as booked on trip with family to north Java, Carita, in a few days.


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