The earthquake, measuring the intensity of earthquakes can be measured two ways to measure the size (magnitude) of the energy is released, which can be calculated. Tracking the nature of the Plants of the 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 vibration at source. Which one will come out. The intensity of the vibration characteristics of the human sense that much of or damage to various buildings are much gauge is called Mercalli seale size since. 1-12 where earthquakes will occur , because the cause of earthquakes caused by tectonic movements. So area The earthquake was located at the junction of tectonic plates, such as the edge of the ocean. Pacific Cycle Also known as the "Ring of Fire" isolated mid-Atlantic ridge. (Mid-Atlantic Ridge) and the area from India, Italy, Greece and Turkey characteristic 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 earthquake. A natural phenomenon, a kind of ground shaking with some influence on the Earth's surface. When the This wave hurtling toward the earth in all parts of the world. And if the earth shake violently. The detector wavelength far away. Tens of thousands of kilometers away, it could also have been earthquakes in ancient times people are very afraid of the earthquake, the Greek poet Homer believes that the earthquake caused the Poseidon, god of the sea was furious. Ancient Chinese people think Earthquakes occur when the dragon that lives under the ground shifting and movement of the body. 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 was attacked in the modern era, has said that belief. Whatever happens will be God lurks within him think that the flow of ocean waves violently apart causing earthquakes men began to understand the phenomenon underground "Good" about 20 years ago that was. found that earthquakes 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 would not feel anything , what is the cause of earthquakes. In order to answer this question, we need to know the structure of the world that we have a basic structure resembling an onion crust is the outermost covering. The shell is thick, flaky like. The continental crust is about 70 km thick crust of the ocean floor to a thickness of about 10 kilometers, representing 0.6% of the radius of the Earth itself. Deep into the layers of the Earth's crust, it's another layer called the mantle by seismic waves in the Earth's crust to a speed of about 7.2 km / sec. But the speed of the waves in the mantle is higher is 8.2 km / sec. The earthquake also divided. Two types of waves and P waves, S (P = primary, primary and secondary S = secondary), which both types of waves moving through. In rocks below the earth's surface particles in rocks that are P-wave impact is shaking back and forth in the waves struck the rock had fallen into compressed and expanded in the case of S waves, the particles in layers. Stone is moving on down the line perpendicular to the direction tending to the wave P is normally faster than S waves, so the measurement time for both P and S waves arrive at the receiver. Situated at different locations on the Earth's surface, geologists will soon realize that. The focal point of the explosion is not present, geologists believe the seismic activity occurred for two reasons. Caused by the volcanic eruption And caused Or collision of tectonic rift apart. Understanding the movements of the crust makes geologists can predict the time. The land will still be a lot better. Especially in Japan, where authorities have warned the earthquake in advance. Preferred budget of 4,000 million baht / year, which is the amount that small. In comparison to the damage caused by the earthquake in history since 25 years ago, this shows that. In the case of the earthquake in Kobe in Japan in the early morning of January 17, 2538, destroyed 200,000 houses has killed 6,000 people and injured 34,000 people, or the city of Spitak in Armenia on 7 December. . Prof. 2531 earthquake in the morning. Making people aware of that, so it killed up to 25,000 people in Mexico and at a place away from the Mexico City 400 kilometers on 19 September 2528 was an earthquake. This 7,500 deaths and damages of 20,000 million baht and include the most severe earthquake in Tangshan in China in the late hours of July 28, 2519 has killed over 250,000 people and injured 800,000. the damage it has caused China to take more than 10 years to build Tangshan to come to life again when he damaged in terms of normal life.
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