The reason why Mount Krakatau continues to grow
Kolom Nasional. Anak Krakatau appeared in 1927, 40 years after the eruption of Mount Krakatau in 1883. The emergence of the Son of Krakatau occurred because the caldera region of Mount Krakatau which erupted in 1883 still continued to issue magma.
The lava coming out of the magma bag froze and continued to accumulate so that it was termed growing. Anak Krakatau has increased this mountain due to material coming out of the mountain's stomach. This is a type of mountain growth by means of extrusion which is the accumulation of material eruptions that cause the volcano to grow outside. Volcanoes are built in this way mainly from two ingredients: lava and ash.
The other way of mountain growth is by intrusion. In this way, the magma moves up to the volcano without erupting. So, the mountain grows from the inside, as quoted from the page of the University of Oregon State, United States.
This mountain grows an average of 8.9 meters per year or 70 cm per month. According to Discovery Volcano records, Krakatau's height has now reached 813 meters above sea level (m asl). Even though in 1935 the mountain height was only 63 meters.
According to the Head of the Center for Data, Information and Public Relations of the National Disaster Management Agency (BNPB) Sutopo Purwo Nugroho, it took 500 years for this mountain to equal its mother's height which reached 2,000 m above sea level.
Growing fast
Anak Krakatau emerged from the Mount Krakatau caldera which is below sea level. The Anak Krakatau Mountain peak began to appear on the surface of the water for the first time on January 26, 1928, but was recorded as born on January 30, 1930 by the 2011 ESDM Geology Agency.
"Growth is very fast. Very active conditions can only occur if the extension system (strain) is strong," said Irwan in 2013.
This stretch occurs because of the movement of the Indo-Australian plate away from the Eurasian continental plate. This movement created an active graben in the Sunda Strait and opened the magma exit which became the kitchen of Mount Krakatau.
This fracture also affects the rows of volcanic activity of the mountains stretching north-south of the Sunda Strait, namely Sukadana, Rajabasa, Sabesi, Sebuku, and Krakatau.
From the row, Krakatau is the fastest growing because there are several magma bags below which are ready to supply magma to the surface. According to him the bag is in the shallow layer (less than 7 km) and the middle layer (7-22 km).
Often erupts
Anak Krakatau was recorded to have erupted 46 times after the massive explosion of 1883. Since June 2012, the mountain has recorded a volcanic earthquake of 1075 times, in July it dropped to 807 times but increased in August to 2,335 times that year. Since its birth, Anak Krakatau has gained a lot of world attention as a legacy from Krakatoa.
Besides Krakatau, the mountain that is also growing in Indonesia is Anak Ranakah (2247.5 m asl) which is located between Mount Mandosawu and Ranakah in Manggarai district, East Nusa Tenggara. Whereas previously the volcano complex was known to be inactive. Its appearance made this volcano the youngest in Indonesia, as noted by the LIPI journal.
The lava coming out of the magma bag froze and continued to accumulate so that it was termed growing. Anak Krakatau has increased this mountain due to material coming out of the mountain's stomach. This is a type of mountain growth by means of extrusion which is the accumulation of material eruptions that cause the volcano to grow outside. Volcanoes are built in this way mainly from two ingredients: lava and ash.
The other way of mountain growth is by intrusion. In this way, the magma moves up to the volcano without erupting. So, the mountain grows from the inside, as quoted from the page of the University of Oregon State, United States.
This mountain grows an average of 8.9 meters per year or 70 cm per month. According to Discovery Volcano records, Krakatau's height has now reached 813 meters above sea level (m asl). Even though in 1935 the mountain height was only 63 meters.
According to the Head of the Center for Data, Information and Public Relations of the National Disaster Management Agency (BNPB) Sutopo Purwo Nugroho, it took 500 years for this mountain to equal its mother's height which reached 2,000 m above sea level.
Growing fast
Anak Krakatau emerged from the Mount Krakatau caldera which is below sea level. The Anak Krakatau Mountain peak began to appear on the surface of the water for the first time on January 26, 1928, but was recorded as born on January 30, 1930 by the 2011 ESDM Geology Agency.
"Growth is very fast. Very active conditions can only occur if the extension system (strain) is strong," said Irwan in 2013.
This stretch occurs because of the movement of the Indo-Australian plate away from the Eurasian continental plate. This movement created an active graben in the Sunda Strait and opened the magma exit which became the kitchen of Mount Krakatau.
This fracture also affects the rows of volcanic activity of the mountains stretching north-south of the Sunda Strait, namely Sukadana, Rajabasa, Sabesi, Sebuku, and Krakatau.
From the row, Krakatau is the fastest growing because there are several magma bags below which are ready to supply magma to the surface. According to him the bag is in the shallow layer (less than 7 km) and the middle layer (7-22 km).
Often erupts
Anak Krakatau was recorded to have erupted 46 times after the massive explosion of 1883. Since June 2012, the mountain has recorded a volcanic earthquake of 1075 times, in July it dropped to 807 times but increased in August to 2,335 times that year. Since its birth, Anak Krakatau has gained a lot of world attention as a legacy from Krakatoa.
Besides Krakatau, the mountain that is also growing in Indonesia is Anak Ranakah (2247.5 m asl) which is located between Mount Mandosawu and Ranakah in Manggarai district, East Nusa Tenggara. Whereas previously the volcano complex was known to be inactive. Its appearance made this volcano the youngest in Indonesia, as noted by the LIPI journal.
Comments
Post a Comment