Earthquakes, also called temblors, can be so tremendously destructive; it’s hard to imagine they occur by the thousands every day around the world, usually in the form of small tremors. , 称 , 极 么状况,经 ; 难 发 。 们 球 发
Some 80 percent of all the planet's earthquakes occur along the rim of the Pacific Ocean, called the "Ring of Fire" because of the preponderance of volcanic activity there as well. Most earthquakes occur at fault zones, where tectonic plates?giant rock slabs that make up the Earth's upper layer?collide or slide against each other. These impacts are usually gradual and unnoticeable on the surface; however, immense stress can build up between plates. When this stress is released quickly, it sends massive vibrations, called seismic waves, often hundreds of miles through the rock and up to the surface. Other quakes can occur far from faults zones when plates are stretched or squeezed. 80% 壳运动, 带, 这 巨 应 球 发 叫 壳 块 ( 球 “ 巨 渐进 ; 释 时,产 巨 , 带” 。 胶层组 ) 碰 许 发 挤压 剧 断层 。
块 间可 动,称
压 。当这 压
,经 会发
数 远 带 。
。当 块 挤压时,
Scientists assign a magnitude rating to earthquakes based on the strength and duration of their seismic waves. A quake measuring 3 to 5 is considered minor or light; 5 to 7 is moderate to strong; 7 to 8 is major; and 8 or more is great. 科学家 级 据 们 认为 强 续时间 级 。 个 3-5 ;7-8 级
轻 ;5-7 级 较强
;8 级及以上就被认为是很大的了。
On average, a magnitude 8 quake strikes somewhere every year and some 10,000 people die in earthquakes annually. Collapsing buildings claim by far the majority of lives, but the destruction is often compounded by mud slides, fires, floods, or tsunamis. Smaller temblors that usually occur in the days following a large earthquake can complicate rescue efforts and cause further death and destruction. 平均,每年世界上都会发生一个 8 级的地震,通常会有一万多人会死 于地震。倒塌的建筑物是造成伤亡的最主要原因,但是破坏度通常加 重由泥石流、火灾、水灾、或海啸。小型地震经常在大地震发生时连 续几天发生,会加重救援困难,并且产生进一步的死亡和破坏。
Loss of life can be avoided through emergency planning, education, and the construction of buildings that sway rather than break under the stress of an earthquake. 生命的损失是可以避免因紧急计划,教 育,以及建造建筑物摇动,而不是打破的压力下的地震
 

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