在线观看亚洲精品专区-在线观看亚洲免费-在线观看亚洲免费视频-在线观看亚洲欧美-欧美freexxx-欧美free嫩交video

食品伙伴網服務號
 
 
當前位置: 首頁 » 專業英語 » 英語短文 » 正文

地震儀是怎樣工作的

放大字體  縮小字體 發布日期:2008-07-08
核心提示:汶川地震讓地震成為人們關注的重心之一。地震的大小是用震級來表明的,那震級是怎么測定的呢?是用測震儀、也就是地震儀。一臺測震儀是怎樣工作的?它如何告訴人們地殼的運動?我們所說的震級又是如何計算出來的呢?下面這篇文章就來告訴您。 A seismograph (地震儀,


    汶川地震讓“地震”成為人們關注的重心之一。地震的大小是用震級來表明的,那震級是怎么測定的呢?是用測震儀、也就是地震儀。一臺測震儀是怎樣工作的?它如何告訴人們地殼的運動?我們所說的震級又是如何計算出來的呢?下面這篇文章就來告訴您。

    A seismograph (地震儀,測震儀) is the device that scientists use to measure earthquakes. The goal of a seismograph is to accurately record the motion of the ground during a quake. If you live in a city, you may have noticed that buildings sometimes shake when a big truck or a subway train rolls by. Good seismographs are therefore isolated and connected to bedrock to prevent this sort of "data pollution."

    (Jason Reed/Getty Images) The Richter scale is a logarithmic scale, meaning that the numbers on the scale measure factors of 10. 

    The main problem that must be solved in creating a seismograph is that when the ground shakes, so does the instrument. Therefore, most seismographs involve a large mass of some sort. You could make a very simple seismograph by hanging a large weight from a rope over a table. By attaching a pen to the weight and taping a piece of paper to the table so that the pen can draw on the paper, you could record tremors in the Earth's crust (earthquakes). If you used a roll of paper and a motor that slowly pulled the paper across the table, you would be able to record tremors over time. However, it would take a pretty large tremor for you to see anything. In a real seismograph, levers or electronics are used to magnify the signal so that very small tremors are detectable. A big mechanical seismograph may have a weight attached that weighs 1,000 pounds (450 kg) or more, and it drives a set of levers that significantly magnify the pen's motion.

    The Richter scale (里氏震級) is a standard scale used to compare earthquakes. It is a logarithmic scale (對數標度), meaning that the numbers on the scale measure factors of 10. So, for example, an earthquake that measures 4.0 on the Richter scale is 10 times larger than one that measures 3.0. On the Richter scale, anything below 2.0 is undetectable to a normal person and is called a microquake. Microquakes occur constantly. Moderate earthquakes measure less than 6.0 or so on the Richter scale. Earthquakes measuring more than 6.0 can cause significant damage. The maximum quake rating ever measured is about 8.9.    

更多翻譯詳細信息請點擊:http://www.trans1.cn
 
關鍵詞: 地震儀
[ 網刊訂閱 ]  [ 專業英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業英語
點擊排行
 
 
Processed in 0.079 second(s), 14 queries, Memory 0.9 M
主站蜘蛛池模板: 日本护士69xx00| 国产偷啪视频一区 | 亚洲产国偷v产偷v自拍色戒 | 国产伦精品一区二区三区四区 | 国产亚洲精品成人一区看片 | 日本一区二区在线不卡 | 久久成人国产 | 一级特黄aaa大片在线观看 | 夜夜春夜夜夜夜猛噜噜噜噜噜 | 伊人久久大香线蕉综合爱婷婷 | 狠狠色噜噜狠狠狠狠999米奇 | 成人欧美一区二区三区视频 | 欧美精品国产第一区二区 | 浮荡视频在线观看免费 | 男女全黄做爰视频 | 日韩一级片免费观看 | 色多多拼多多网站 | 色激情综合 | 国产大片黄在线看免费 | 亚洲成人高清在线 | 日本老师xxxxxxxxx79 | japan高清视频乱xxxxx | 超级乱淫片67194免费看 | 在线观看视频你懂的 | 亚洲欧洲国产精品你懂的 | 美女色黄一男一女 | 日本精品三级 | 特级全黄一级毛片免费 | 午夜男人影院 | 一卡二卡四卡无卡乱免费网页 | 欧美性天天 | 天天干夜夜操视频 | 日本在线观看永久免费网站 | 一级特黄牲大片免费视频 | 深夜免费在线视频 | 57pao成人永久免费视频 | 四虎海外在线永久免费看 | 亚洲成a人片毛片在线 | 国产激爽大片在线播放 | 国产精品不卡片视频免费观看 | 一级毛片日韩a欧美 |