How and Why There Are An Earthquake

An earthquake is a vibration or shocks that occur in the earth's surface due to the release of energy from the sudden that creates seismic waves. Ordinary earthquakes are caused by movement of the earth's crust (the Earth's plates). The frequency of a region, refers to the type and size of earthquakes in the experience during the period of time. The earthquake was measured using a seismometer.

Moment magnitude is the most common scale in which earthquakes occur for the entire world. rickter scale is the scale have been reported by the national seismological observatories in the measure on the local magnitude scale magnitude 5. the same scale over the range of their number is valid. earthquakes of magnitude 3 or more most of the nearly invisible and her seven great more potential to cause serious damage over large areas, depending on the depth of the earthquake. The largest earthquake of historic magnitude telahvlebih of 9, although there is no size restriction. The last major earthquake magnitude 9.0 or greater is a 9.0 magnitude earthquake in Japan in 2011 (as of March 2011), and it is Japan's biggest quake since records began. The intensity of vibration measured on the modified Mercalli Scale.

There Are 2 Types Of An Earthquakes :

1. Volcanic earthquakes (Fire Mountain) This earthquake occurred as a result of magma activity, which usually occurs before the volcano erupted. If the higher activeness it will cause an explosion that will also cause earthquakes. The earthquake was only felt around the volcano.
2. Tectonic earthquake: An earthquake is caused by tectonic activity, that is tectonic plates shift suddenly has the power of the very small to very large. This earthquake generated a lot of damage or natural disasters on earth, a strong earthquake vibrations can spread throughout the earth. Tectonic earthquakes are caused by perlepasan [power] that occurs due to plate tectonic plate shifts like a rubber band is stretched and released abruptly. Power generated by the pressure between the rocks known as tectonic disability. Theory of Tectonic plate (plate tectonics) explains that the earth is composed of several layers of rock, most areas of the crust layer it will drift and float in layers like snow. Stir gently so that the layer-break berpecah and collide with each other. This is what causes the occurrence of tectonic earthquakes.

Most earthquakes are caused from the release of the energy produced by the pressure carried by the moving plates. The longer the pressure was becoming enlarged and eventually reached the state where the pressure can not be detained again by the edge of the slab. That's when an earthquake will occur.

Earthquakes usually occur on the border of the plate slabs. The most severe earthquakes typically occur at plate boundaries compressional and translational. Focus earthquakes likely to occur because the material layer is sandwiched lithosphere into a phase transition at a depth of more than 600 km.

Several other earthquakes can also occur due to movement of magma inside the volcano. Such earthquakes can be a symptom of impending volcanic eruptions. Some earthquakes (rarely however) also occur due to accumulated an enormous mass of water behind the dam, such as the Caribbean Dam in Zambia, Africa. Others (also rare) can also occur due to fluid injection or akstraksi from / into the earth (eg in some geothermal power plants and in the Rocky Mountain Arsenal. Lastly, earthquakes can also occur from detonation of explosives. This can make scientists to monitor nuclear weapons tests conducted secret government. the earthquake that caused by humans is called also seismisitas induced