Earthquakes have often occurred in Indonesia and even had to pose a tsunami wave that many casualties. Just to add insight below will describe the types of earthquakes, may be useful for us all.
Read more: where do earthquakes occur most often
Based on the type of cause
The earthquake was caused by the tectonic activity, ie shifting tectonic plates suddenly has the power from very small to very large. This earthquake caused more damage or natural disasters on earth, a powerful earthquake vibrations capable of spreading to all parts of the earth.
Tectonic earthquakes are caused by perlepasan [power] that occur due to shifting tectonic plates plate like a rubber band is stretched and released suddenly. Power generated by the pressure between the rocks known as tectonic disability. The theory of plate tectonics (plate tectonics) explains that the earth is composed of several layers of rock, most of the area of the crust it will drift and float in layers like snow. These layers stir slowly so broken to pieces and collide with each other.
This is what causes earthquakes tectonic tektonik.Gempa indeed unique. Map of the distribution follows the pattern and special rules and narrow, which follows the pattern of meeting tectonic plates that make up the earth’s crust. In the earth sciences (geology), the theoretical framework of plate tectonics is a postulate to explain the phenomenon of tectonic earthquake that hit virtually the entire area, which is adjacent to the boundary of tectonic plates meeting. Earthquake collision; The earthquake was caused by a meteor or asteroid that fell to Earth, types of earthquakes are rare
Volcanic earthquakes (volcano)
Earthquakes have occurred as a result of magma activity, which usually happens before the volcano erupted. If the higher activeness it will cause an explosion that would also lead to the occurrence of earthquakes. The earthquake was only felt around the volcano.
Earthquake is caused by a meteor or asteroid that fell to Earth, types of earthquakes are rare
Earthquakes usually occur in the limestone area or in mining regions, this earthquake is rare and localized.
Artificial earthquake was an earthquake caused by the activities of humans, such as the detonation of dynamite, nuclear or hammers that struck the earth’s surface.
Based on the type of Depth
Earthquakes in earthquake hiposentrumnya is located more than 300 km below the earth’s surface (within the crust). Earthquakes in generally not very dangerous.
Medium earthquakes are earthquake hiposentrumnya located between 60 km and 300 km below the earth’s surface bumi.gempa medium generally mild and vibration damage is more pronounced.
Shallow earthquakes are earthquake hiposentrumnya located less than 60 km from the earth’s surface. These earthquakes usually cause great damage.
Based on the type of wave
- Primary waves
Primary wave (wave lungitudinal) are waves or vibrations propagate in the body of the earth with a speed of 7-14 km / sec. These vibrations come from hiposentrum
- Secondary waves
Secondary wave (transverse wave) is waves or vibrations propagate, such as primary waves at speeds that have been reduced, which is 4-7 km / sec. Secondary waves can not propagate through the liquid layer.