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5.12汶川地震(英文版)

作者:高考题库网
来源:https://www.bjmy2z.cn/gaokao
2021-02-07 11:43
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2021年2月7日发(作者:道歉)


5.12 Wenchuan earthquake


Seismic parameters



Time:


at 14:28 on May 12, 2008 04.0 seconds



Latitude: 31.0 ° N


Longitude: 103.4 ° E


Depth: 33 km


Richter:


Richter 8.0


The greatest intensity: 11 degrees


Epicenter: Yingxiuwan town of Wenchuan County, Sichuan


Dujiangyan city, Dayi County, northwest 48 km (346 °) northwest of


Chengdu 75 km (302 °)


Causes



CAS


researcher


at


the


Institute


of


Geology


and


Geophysics,


the


Qinghai-Tibet


Plateau


Research


Wang


Wenchuan


27


pairs


more


familiar


with regional geological structure, in early May has been Wenchuan


area. He


analyzed that


Wenchuan earthquake


occurred in


the southeast


edge of the Qinghai-Tibet Plateau, western Sichuan Longmenshan the


center,


located


in


Wenchuan


-


Timor-mao


on


the


fault



Ocean


plate


northward


movement,


squeezing


the


Eurasian


plate,


causing


uplift


of the Qinghai-Tibet Plateau. At the same time in the uplift of the


plateau,


also


eastward


movement,


squeezing


the


Sichuan


Basin.


Sichuan


Basin


is


a


relatively


stable


block.


Although


the


main


looks


Longmenshan


tectonic activity is not strong, but the stress may be stored in the


process


of


accumulation


to


a


certain


extent,


the


crust


will


break


down,


so the earthquake. The U.S.


Geological Survey also


released


the news


that


the earthquake's epicenter and


focal


mechanisms and


Longmenshan


fault


or


a related movement


of tectonic


fault


in


line,


the


earthquake


is


a


thrust


to


the


northeast


of


the


campaign


results.


From


the


mainland


scale,


Central


Asia


and


East


Asia, the


seismic


activity is due


to


the


Indian


Ocean


plate


collision


of


the


Eurasian


Plate.


Southern


California


Earthquake Research Center, Professor Li Yonggang told Xinhua,


Longmenshan fault zone is earthquake-prone region of active faults,


from the Qinghai-Tibet Plateau deep eastward flow of material


disruption


to


the


Sichuan


Basin,


the


upward


movement,


which


both


border


For the fault plane. If the fault movement a few centimeters a year,


once


every 50 to 70 meters, the


accumulation


of


stress


and energy


can


be


generated


from


a


magnitude


7


earthquake


above.


As


the


source


shallow,


and


focal


mechanism


for


the


eastward thrust


of


the


campaign, coupled


with soft soil earthquake zone, seismic waves will spread eastward


very long, making far to Shanghai and Beijing and other cities have


generally felt.

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