An earthquake,
"earthquake" is a natural disaster caused by the vibration of the ground. Caused by the release of energy. To vent the stress that accumulates inside the sudden burst to balance the constant tectonic earthquake is a shaking of the earth. The intensity of the quake is not felt until the man who caused the damage. Breakdown of construction such as building roads, dams, etc.,
causes earthquakes
and natural earthquake. Is one of the most earthquake is a natural phenomenon caused by the vibration of the ground caused by the release of energy to release stress. Collection sudden burst to the world. Balance of the Earth's crust to stabilize. The mechanical theory Earthquakes recognized in the current second theory is
the theory that with the expansion of the crust (Dilation source theory) believe that the earthquake caused the Earth's crust. The crooked bend abruptly. And when it fell apart, thus releasing energy in the form of seismic waves
that theory by restoring the object (Elastic rebound theory) believe that the earthquake caused a concussion. The reason comes from the movement of the fault (Fault) So when an object is moving at one point fell apart and lost a lot with the release of energy. Our tectonic plates consist of approximately 12 sheets of both the oceanic plate and continental plate. Which is moving all the time to make some plates are moving apart. Some plates move toward each other and burrow nesting ground. Some plates move past each other and moving as a source of stress that has accumulated inside. The crust itself Earthquakes occur when stress as a result of the change, too. This condition occurs more often Within the boundaries of tectonic plates The earthquake occurred at the boundary between the plates that earthquakes (interplate earthquake) caused frequent and more severe. Earthquakes within plates (intraplate earthquake)
earthquake of human action. There are both direct and indirect, such as the explosion of the atomic bomb experiments. Create a Collection Water dam near fault Operation of machinery, traffic, water retention dams and the explosion of. Mines So
why earthquakes
cause of earthquakes caused by the movement of the earth (earth crust) because the crust with a sheet (plates) by combining virtual jigsaw puzzle with the world is very hot, causing current circulation (convection. ) of the mantle (mantle) has three characteristics: 1. movement of tectonic collision (convergent plates) 2. split or split apart (divergent plates) 3. movement in friction (transform plates) are also available. cause Other possible causes of earthquakes, but not a major cause as well. Chance of a meteor falling like a nuclear bomb or the other. Etc.
to measure the intensity of earthquakes
of seismic intensity can be measured two ways to
measure the size (magnitude) of the energy is released, which can be calculated. Plants on the nature of the track. Earthquake by seismograph (seismograph) gauge is called Richter seale ranging in size from 1.0 (least severe) to 9.0 (very strong)
intensity (intensity) of the intensity of the shaking at one place, which will come out. In the intensity of the shaking. The man felt much damage to the building or a different gauge how much is called Mercalli seale size since. 1-12
where earthquakes are
caused by the movement of tectonic earthquakes. So area The earthquake was located at the junction of the plate. Such as the edges of tectonic ocean. Pacific Cycle Also known as the "Ring of Fire" area's isolation. Mid-Atlantic (Mid-Atlantic Ridge) and the area from India, Italy, Greece and Turkey
earthquakes occur every day. But mostly mild And do not cause damage The severe earthquake Caused by the vibration of the earth. The split on the ground, tsunami, landslide dams collapse, fire, leaks of hazardous materials, which can cause damage. And the loss of many lives
, people are afraid of the earthquake in the ancient Greek poet Homer is believed that the earthquake caused the Poseidon, god of the sea was furious. Ancient Chinese people think that earthquakes occur when the dragon that lives under the ground shifting. And body movements Simultaneously, it was a roar. The Japanese people believe The god of fish named Namazu tail flick back and forth to cause an earthquake, but the Greek philosopher Thales, who had described the attack in the modern era. The belief that whatever happens will be God lurks within him think that the flow of ocean waves violently. That's causing the earthquake
people started to understand this phenomenon, underground "Good" about 20 years ago that by the time an earthquake. All seismic waves Looks like moving from one location underground. Which geologists call such a position that the focal point and the surface above the focus is called the academic as epicenter, and as usual, the focal point of the seismic waves are usually deep under the earth, about 15 kilometers, but in some. The depth of focus may be up to 400 kilometers, it has geologists estimated that every day is earthquake occurred on Earth 1,000 times, but most people will not feel. And gently shake it too. The reason this is so, That means that 50% of the seismic waves may have been detected, but the other 50% remaining in the area that are not inhabited. I will not feel anything
today, geologists believe the seismic activity caused by two reasons. Caused by the volcanic eruption And caused Or collision of tectonic rift apart. Understanding the mechanism of movement of the stripper.
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