Tsunami is the transfer of water bodies caused by changes in sea surface vertically with a sudden. Changes in sea level can be caused by an earthquake centered under the sea, underwater volcanic eruptions, underwater landslides, or or a meteor hit the ocean. Tsunami waves can propagate in all directions. Power contained in the tsunami wave height is fixed to the function and On the next. In the deep ocean, tsunami waves can propagate with the speed of 500-1000 km per hour. Equivalent to the speed of aircraft. Deep-sea wave height is only about 1 meter. Thus, the wave speed is not felt by the ship which was in the middle of the sea. When approaching the coast, the tsunami wave velocity decreases to about 30 km per hour, but its height was increased to reach tens of meters. Tsunami waves can go blow up to tens of kilometers from the beach. Damage and casualties that occur because of the Tsunami can be caused by a blow of water and materials carried by the flow of tsunami waves.
The negative impact caused by tsunamis are destroying everything in its path. Buildings, plants, and resulted in human casualties and causing inundation, salt water contamination of agricultural land, soil, and clean water.
The Greek historian Thucydides was the first name that links the tsunami by an earthquake under the other. But until the 20th century, knowledge about the cause of the tsunami is still very minimal. Research is still underway to understand the causes of tsunamis.
The texts of geology, geography, and oceanography in the past called tsunamis as "seismic sea waves".
Some of the meteorological conditions, such as tropical cyclones, storm surges can cause the so-called meteor tsunami wave height several meters above normal sea. When the storm made landfall, the shape can resemble the tsunami, although not a tsunami. Wave could inundate the land. This storm surge had flooded the Burmese (Myanmar) in May 2008.
Kamis, 17 Februari 2011
Rabu, 16 Februari 2011
EARTHQUAKE
An earthquake is a vibration or shock that occurs on the surface of the earth. Earthquakes are usually caused by movement of the earth's crust (tectonic plates). The word earthquake is also used to indicate the origin of the earthquake occurrence. Our Earth is solid though, always moving, and earthquakes occur when the pressure is happening because the movement was already too large to hold.
This type of
1 Volcanic earthquakes (Gunung Api) This earthquake occurred as a result of magmatic activity, which usually occurs before the volcano erupted. If its activity the higher it will cause an explosion that also will lead to the occurrence of earthquakes. The earthquake was only felt in the vicinity of the volcano.
2. Tectonic earthquake; This earthquake caused by tectonic activity, namely a shift in plate tectonic plates suddenly having 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] is happening because of a shift in plate tectonic plates pulled like a rubber band and released abruptly. Power generated by the pressure between the rock known as tectonic disability. The theory of tectonic plates (tectonic plates) explains that the earth consists of several layers of rock, most areas of the crust it will drift and float in layers like the snow. Stir gently so that the layer-break berpecah and collide with each other. This is what causes the occurrence of tectonic earthquake.
3. Earthquake impact; This earthquake caused by a meteor or asteroid collision that fell to earth, kind of an earthquake is seldom the case
4. Earthquake ruins; Earthquakes usually occur in limestone areas or in areas of mining, these earthquakes are rare and localized.
5.Artificial earthquake is an earthquake caused by the activities of humans, such as dynamite blasting, nuclear or hammer that struck the earth's surface.
THE CAUSE EARTHQUAKE
Most earthquakes result from the release of energy generated by the pressure exerted by a moving plate. The longer the pressure was becoming enlarged and eventually reach the state where the pressure can not be arrested again by the edge of plate. That's when an earthquake will occur.
Earthquakes usually happen at plate boundaries such slabs. The most severe earthquakes usually occur in the compressional and translational plate boundary. The earthquake focus in the most likely to occur because the material is sandwiched into the layers of the lithosphere undergoes phase transition at a depth of more than 600 km.
Several other earthquakes can also occur due to the movement of magma inside the volcano. Such an earthquake could be symptoms of impending volcanic eruptions. Several earthquakes (rarely but) also occur because of accumulated huge mass of water behind the dam, such as the Caribbean Dam in Zambia, Africa. The rest of them (also rare) can also occur due to injection or akstraksi fluid from / into the earth (eg in some geothermal power plants and in the Rocky Mountain Arsenal. Finally, earthquakes can also occur from detonation of explosives. This can make scientists to monitor nuclear weapons tests conducted secret government. Earthquakes are caused by humans such as this is also called induced seismicity
This type of
1 Volcanic earthquakes (Gunung Api) This earthquake occurred as a result of magmatic activity, which usually occurs before the volcano erupted. If its activity the higher it will cause an explosion that also will lead to the occurrence of earthquakes. The earthquake was only felt in the vicinity of the volcano.
2. Tectonic earthquake; This earthquake caused by tectonic activity, namely a shift in plate tectonic plates suddenly having 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] is happening because of a shift in plate tectonic plates pulled like a rubber band and released abruptly. Power generated by the pressure between the rock known as tectonic disability. The theory of tectonic plates (tectonic plates) explains that the earth consists of several layers of rock, most areas of the crust it will drift and float in layers like the snow. Stir gently so that the layer-break berpecah and collide with each other. This is what causes the occurrence of tectonic earthquake.
3. Earthquake impact; This earthquake caused by a meteor or asteroid collision that fell to earth, kind of an earthquake is seldom the case
4. Earthquake ruins; Earthquakes usually occur in limestone areas or in areas of mining, these earthquakes are rare and localized.
5.Artificial earthquake is an earthquake caused by the activities of humans, such as dynamite blasting, nuclear or hammer that struck the earth's surface.
THE CAUSE EARTHQUAKE
Most earthquakes result from the release of energy generated by the pressure exerted by a moving plate. The longer the pressure was becoming enlarged and eventually reach the state where the pressure can not be arrested again by the edge of plate. That's when an earthquake will occur.
Earthquakes usually happen at plate boundaries such slabs. The most severe earthquakes usually occur in the compressional and translational plate boundary. The earthquake focus in the most likely to occur because the material is sandwiched into the layers of the lithosphere undergoes phase transition at a depth of more than 600 km.
Several other earthquakes can also occur due to the movement of magma inside the volcano. Such an earthquake could be symptoms of impending volcanic eruptions. Several earthquakes (rarely but) also occur because of accumulated huge mass of water behind the dam, such as the Caribbean Dam in Zambia, Africa. The rest of them (also rare) can also occur due to injection or akstraksi fluid from / into the earth (eg in some geothermal power plants and in the Rocky Mountain Arsenal. Finally, earthquakes can also occur from detonation of explosives. This can make scientists to monitor nuclear weapons tests conducted secret government. Earthquakes are caused by humans such as this is also called induced seismicity
