In geological Indonesia`s land is located in 2 world young mountain lines, they are Mediterranean mountain in west and sircum pacific mountain in east. It causes Indonesia has many mounts all over the island in Indonesia which are still active and troubled to become a disaster. So Indonesia may call by the name `ring of fire nations` with many disasters happened from time to time. Main disasters have happened in Indonesia are tsunami, earthquake, and volcano eruption.
Earthquake is the result of a sudden release of energy in the earth crush that creates seismic waves. At the earth`s surface, earthquake manifest themselves by shaking and sometimes by displacing the ground .Type and size of earthquake experienced over a period of time. Sensitive islands happen earthquake are Sumatra island, Java island, Papua island, and many small islands more .
Volcano eruption is a part of volcanic activity. Nearly all of mount activities has relation with active earthquake zone, cause it relates to earth`s crush boundary. In this boundary happen pressure and temperature change very highly so it can melt materiel around them which is called magma. Magma will intrude stones and land around them from the crack of it to earth`s surface. Indonesia with many active mounts is so often happen volcanic eruption like Merapi eruption in several times ago in Jogja which made great broken effect around Merapi and many victims of the Jogja native people.
Tsunami can be meant as sea`s waves with long period which made by impulsive disturbing from base of the sea. The impulsive disturbing can be by tectonic earthquake or volcanic eruption. The velocity of tsunami from the sea to the land about 25-100 Km/hour and height has been happen in Indonesia till 36 m which happen in 1883 when mount Krakatau eruption happened . In our country generally tsunami might happen in about 40 minutes after the earthquake happened from base of the sea. Tsunami can not predict accurately but we can know from the sign of it or from warning of the tsunami so that we can have enough time for saving ourselves from tsunami.
By big effect from the mountain base or the ring of fire, it all really need our serious attention how holding disaster very well so the victim can be decreased. However disaster can not be predicted accurately by the people but we can make it known from signs a disaster will happen in an area and we can give warning from the signs.
( some information is sourced from wikipidia.com )
BY : Syafriko Yuliusman, Fitra Ferdian S.
- Indonesia Volcanic Eruptions (kncorganic.wordpress.com)
- Indonesia volcano erupts in Pacific Ring of Fire,Japan tsunami (socialdiets.wordpress.com)
- New lava dome seen in Indonesia’s Merapi volcano (theextinctionprotocol.wordpress.com)
- Indonesia volcano erupts (independent.co.uk)
- Lava spews 65 feet high after crater collapse (thenewstribune.com)