英语作文 ——地震

英语作文 ——地震 The earthquake What is the earthquake The boundaries between moving plates form the largest fault surfaces on Earth. When they stick, relative motion between the plates leads to increasing stress. This continues until the stress rises and breaks, suddenly allowing sliding over the locked portion of the fault, releasing the stored energy. An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes are recorded with a seismometer, also known as a seismograph. The moment magnitude of an earthquake is conventionally reported, or the related and mostly obsolete Richter magnitude, with magnitude 3 or lower earthquakes being mostly imperceptible and magnitude 7 causing serious damage over large areas. Intensity of shaking is measured on the modified Mercalli scale. At the Earth's surface, earthquakes manifest themselves by a shaking and sometimes displacement of the ground. When a large earthquake epicenter is located offshore, the seabed sometimes suffers sufficient displacement to cause a tsunami. The shaking in earthquakes can also trigger landslides and occasionally volcanic activity. In its most generic sense, the word earthquake is used to describe any seismic event—whether a natural phenomenon or an event caused by humans—that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults, but also by volcanic activity, landslides, mine blasts, and nuclear experiments. An earthquake's point of initial rupture is called its focus or hypocenter. The term epicenter means the point at ground level directly above this. Causes of earthquakes Earthquakes are caused by tectonic movements in the Earth's crust. The main cause is that when tectonic plates collide, one rides over the other, causing orogeny (mountain building), earthquakes and volcanoes. See plate tectonics. The earthquake omen The earthquake, before specially the violent earthquake occurs, the general meeting appears…`abnormal phenomena. The people observe - to occur with the earthquake have the close contacting abnormal phenomenon to be called the earthquake omen. (1) The ground water is unusual. (2) The animal is unusual (3) Flashes of light preceding an earthquake and earthquake sounds Before how to prepare for earthquake's 1 .Understands the earthquake knowledge, grasps the quakeproof emergency procedures 2. Believes the science, opposes to blindly believe, does not readily believe the earthquake rumor 3. Is clear about the evacuation route, to seek asylum the place, prepares to seek asylum with the rescue goods. Usually must prepare the skilled person flashlight, the cigarette lighter, the radio, suffices food which and tap water three days use. 4 Reinforces the indoor furniture sundry goods, places objects and so on high place small thing, picture frame to shift to the floor on, avoids the furniture sundry goods when the earthquake reverses falls creates the injury accident. 5 .Assigns when the earthquake individual emergency duty, specially protects from fire; When leaves home, should turn off the fuel gas stove, the extinguishment furnace fire, the dump and so on; Must protect old person the child; Carries the quakeproof thing and so on to carry out the human according to the duty division of labor, avoids shaking time flustered, cannot attend to one thing without losing track of another thing. Earthquakes survival tips If the ground begins shaking while you are driving, pull over and stay in your car. If you are in a building, try to get near a strong wall. The corner of a room or the space under a big doorway is the safest. As soon as the quake is over, check the gas pipe in the building. Gas fires often result from earthquakes. These tips may prove to be lifesavers. We should, therefore, keep them in mind. Remember to always hope for the best but prepare for the worst.