A measure of the severity of the earthquake. The violence of the land do 2 ways.Measure the size (magnitude) of the energy is released, which can be calculated from the tracking characteristics of khluen earthquakes by measuring earthquake (seismograph). This gauge called Richter between seale (less severe) 1.0 to 9.0 (very severe). Measure of intensity (intensity) of the violence shaking at somewhere which will come out in a way the severity of shaking that humans feel that how much or damage of various construction. There is much the gauge between the Mercalli seale 1-12.Earthquake occurs where? Because the cause of the earthquakes are caused by the motion of the crust. So where will the earthquake, it is located at the boundaries of the plate tectonics, the Pacific Ocean, around the edges, or known as the "Ring of Fire", a separate area of the San klangomhatmuthon Atlantic (Mid-Atlantic Ridge) and Greece and Italy from India country, area, Turkey. Specific characteristics. Earthquakes happen every day but it's mostly mild and do not cause damage. The portion size for the most part serious earthquake caused the vibration of the Earth. Crevice in the ground. Tsunami waves. Fire ruins landslide dam leakage of hazardous material, etc., which can cause damage and loss of life to many people.The earthquake is a natural phenomenon where the ground has been shaking with some influence under the surface of the Earth. Which, when it happens This event will go to the South, waves arms to the area of all parts of the world. And if the flicker of the harsh land. Detecting device, the waves far away. Tens of thousands of kilometres away, it is also possible to receive earthquake waves. People in ancient times there was a lot of fear of the earthquake. Greek poet Homer to ask kachuea whether the earthquake caused by the God of the sea Poseidon deep he was angry. Ancient Chinese people think that earthquakes occur when the serpent dragons living beneath the ground shifting and movement of the trunk at the same time, have sent a roar. Best time in Japan that people believe that God designed the fish tail wind blowing back and forth name Namazu will cause an earthquake, but the Green is SAGE Thales in modern era has attacked belief that anything that occurs there must be a God to dwell within it by him, I think of the waves in the ocean, causing a severe cause earthquake. Humans began to understand this underground phenomenon "good" when about 20 years by that time earthquakes. The earthquake waves, each wave will look at moving out of the virtual position, one of the underground, which geologists call the location that points to a location on the surface of the Earth and beyond the focus point. Have the usual academic epicenter and focal point, whether it's the earthquake waves usually travel about 15 km deep beneath the Earth, but in some cases, the term depth of focus may be as much as 400 kilometers, with? Geologists estimate that every day will be the earthquake occurred. On the Earth, but most of the time, 1000 counts will not feel because it's too light to flicker and phaeo. When the reason for this is that it means that 50% of the earthquake waves, there may be people, but the other 50% check the remainder originating in areas where there are no people live, they will not feel anything. What are the reasons that caused the earthquake? In order to answer this question, we need to know the structure of the world before that we have a structure similar to the onion is rung on outermost shell this shell wrappers which are irregular in thickness, such as if a thick crust that is about 70 km to the continent and the world, shell thongomha.The ocean is thick, about 10 km, which accounted for 0.6% of the radius of the Earth. Deep from the crust to the Earth's layers, one layer, called a mantle, another normal wave, earthquake in the crust is about 7.2 km/s speed, but the speed of the wave in the mantle layer is much higher than is 8.2 km/s. In addition, the earthquake waves, the wave split into two types of P and S waves (P = primary S = secondary primary secondary section), both types of wave motion time goes by. The stone surface beneath the Earth. The various stones that are particle waves P be shaking back and forth in the waves crept to it. So it was in a rock layer is compressed and expanded. The section, in the case of the S waves, particles of stone floor will move in a direction that is perpendicular to the thrust of the waves. P wave velocity is commonly more than S waves, so the time that both P and S waves travel through the receiver position on the surface of the Earth to make that point, geologists know the focus of the bomb? Currently geologists believe that the second earthquake occurred for two reasons, is caused by the explosion of a volcano and caused strife or cracking of the crust. Understanding the mechanisms of movement of the crust, geologists can predict the time that Earth is much improved. In particular, countries that Japan must have earthquake warning ahead of time that you want to execute statements of up to 4000 million/year, which is the amount of money behind. When compared with the damage that will be caused. เพราะประวัติการเกิดเหตุการณ์แผ่นดินไหวในระยะเวลา 25 ปี ที่ผ่านมานี้ แสดงให้เห็นว่า ในกรณีแผ่นดินไหวที่เมือง Kobe ในประเทศ ญี่ปุ่น เมื่อยามเช้าตรู่ของวันที่ 17 มกราคม พ.ศ. 2538 ได้ทำลายบ้านเมือง 200,000 หลัง มีคนเสียชีวิต 6,000 คน และบาดเจ็บ 34,000 คน หรือที่เมือง Spitak ในประเทศ Armenia เมื่อวันที 7 ธันวาคม พ.ศ. 2531 ได้เกิดแผ่นดินไหวในยามเช้า ทำให้ผู้คนไม่ทันตั้งตัว จึงล้มตายถึง 25,000 คน และที่ประเทศเม็กซิโก ณ สถานที่ที่อยู่ห่างจาก Mexico City 400 กิโลเมตร ในวันที่ 19 กันยายน พ.ศ. 2528 ก็มีแผ่นดินไหว กรณีนี้มีคนตาย 7,500 คน และค่าเสียหาย 20,000 ล้านบาท และรายที่รุนแรงที่สุด ได้แก่ เหตุการณ์แผ่นดินไหวที่ Tangshan ในประเทศจีน ในตอนดึกของวันที่ 28 กรกฎาคม พ.ศ. 2519 ทำให้มีคนเสียชีวิตกว่า 250,000 คน และบาดเจ็บร่วม 800,000 คน ความเสียหายครั้งนั้นได้ทำให้จีนต้องใช้เวลานานกว่า 10 ปี จึงสร้าง Tangshan ให้มีชีวิตขึ้นมาได้อีกครั้งหนึ่ง When told of the life term for corruption that success.
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