Informative speech about earthquake Essay

unsloped morning everyone, I am Jialin Yin. Today, I want to talk active the temblor. In 2008 May 12th, it was the first time that I felt the temblor which was a 7.8- order earthquake happened in Wenchuan China. At that time, I was a 7th grade student and model in class room, then, I observe that the light on the ceiling began to raise slightly. Then, the broadcast news reminds me, that was an earthquake and some 70000 people died in this severe inseparable disaster.During the speech, I will explain the earthquake in geographic view to you. Firstly, for what argue caused the earthquake? Generally, when rocks experience brittle failure, a kind of energy called seismic waves ar exculpated from the channelize of breakage. The seismic waves generated cause the argument shake, creating an earthquake. That point of breakage is called the focus, or hypo nubble of the earthquake. A term people might be generally familiar with is epicenter which is the point on the surface of Earth like a shot above the focus, and the focus is the true center of an earthquake.Secondly, I want to talk about where are earthquake located, the first visualize is the plate boundary. You foot observe that in that location are many red dots on the second picture. These red dots represent epicenter of earthquakes that have occurred over the past 50 year. Actually, what you can notice right away(p) is that most of these earthquakes occurred along with the plate boundaries. Moreover, we can also notice is that there are a few earthquakes that occur furthest away from plate boundaries, these kinds of earthquakes named intra-plate earthquakes. About provided five percent of earthquakes that occur severally year are intra-plate earthquakes.Look at this chart, here are five columns, they are magnitudes, frequency, description, example and energy firing off. In fact, from earthquake magnitude 2 to 6, the energy release and damage is not huge. The classes of seismic pulsati on for the modern buildings are 5 to 6. However, if the earthquake magnitude is bigger than 6, the energy release can be destructive pull down billions dollar loss of life. Let us specify the damage of magnitude 8 and 9. The difference of energy from one magnitude to another is approximately 31 times.