首页
登录
职称英语
Most earthquakes occur within the upper 15 miles of the earth’s surface. But
Most earthquakes occur within the upper 15 miles of the earth’s surface. But
游客
2025-01-15
31
管理
问题
Most earthquakes occur within the upper 15 miles of the earth’s surface. But earthquakes can and do occur at all depths to about 460 miles. Their number decreases as the depth increases. At about 460 miles one earthquake occurs only every few years. Near the surface earthquakes may run as high as 100 in a month, but the yearly average does not vary much. In comparison with the total number of earthquakes each year, the number of disastrous earthquakes is very small.
The extent of the disaster in an earthquake depends on many factors. If you carefully build a toy house with an erect set, it will still stand no matter how much you shake the table. But if you build a toy house with a pack of cards, a slight shake of the table will make it fall. An earthquake in Agadir, Morocco, was not strong enough to be recorded on distant instruments, but it completely destroyed the city. Many stronger earthquakes have done comparatively little damage. If a building is well constructed and built on solid ground, it will resist an earthquake. Most deaths in earthquakes have been due to faulty building construction or poor building sites. A third and very serious factor is panic. When people rush out into narrow streets, more deaths will result.
The United Nations has played an important part in reducing the damage done by earthquakes. It has sent a team of experts to all countries known to be affected by earthquakes. Working with local geologists and engineers, the experts have studied the nature of the ground and the type of most practical building code for the local area. If followed, these suggestions will make disastrous earthquakes almost a thing of the past.
There is one type of earthquake disaster that little can be done about. This is the disaster caused by seismic sea waves, or tsunamis. (These are often called tidal waves, but the name is incorrect. They have nothing to do with tides. ) In certain areas, earthquakes take place beneath the sea. These submarine earthquakes sometimes give rise to seismic sea waves. The waves are not noticeable out at sea because of their long wave length. But when they roll into harbors, they pile up into walls of water 6 to 60 feet high. The Japanese call them "tsunamis", meaning "harbor waves", because they reach a sizable height only in harbors.
Tsunamis travel fairly slowly, at speeds up to 500 miles an hour. An adequate warning system is in use to warn all shores likely to be reached by the waves. But this only enables people to leave the threatened shores for higher ground. There is no way to stop the oncoming wave. [br] The destruction of Agadir is an example of
选项
A、faulty building construction
B、an earthquake’s strength
C、widespread panic in earthquakes
D、ineffective instruments
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3914040.html
相关试题推荐
Innovationcancomefromwithoutaswellaswithin.Appleiswidelyassumed
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
[originaltext]Earthquakesareviolent,destructive—andunpredictable!Theo
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
Next,let’stalkaboutearthquakesonourPlanet.Somecountrieshavelarge
随机试题
Theincreaseinglobaltrademeansthatinternationalcompaniescannotaffor
(1)TheWestlifestoryreallybeganwaybackinDecember1996whenthethree
食品安全问题是关系到千千万万人民群众切身利益的社会问题。可是在中国,重大食品安全事件频繁发生,食品安全问题日益严峻。某些没有诚信的商人为了追求利润最大化
SmotherLove[A]Everymorning,LeanneBricklandandhersisterwouldbic
产品成本计算方法一经选定,一般不得随意变动。()
不能提示羊膜腔感染的检查项目是A.羊水涂片计数白细胞>100个/ml B.羊水
患者,女,67岁,股骨颈骨折复位+内固定术后,护士指导患者进行功能锻炼的目的,下
陈旧性肛裂可用A.贯穿结扎法 B.注射法 C.静脉丛切除术 D.外剥内扎术
()不属于风险特征。A:普遍性B:可测性C:确定性D:客观性
关于建设工程质量保修的说法,正确的是()。A.不同类型的建设工程,其保修范
最新回复
(
0
)