摘要
潮汐和厄尔尼诺事件使东西太平洋海面高度分别升降 6 0cm ,水均衡作用使洋壳反向升降2 0cm。由此形成东西太平洋地壳跷跷板运动。这是地震火山群发事件与厄尔尼诺事件一一对应的原因。发生在印度洋的同样过程是青藏高原隆升的原因。剥蚀沉积也会产生陆海地壳的跷跷板运动。计算表明 ,5 0年的剥蚀沉积作用施加在陆海地壳两端的力矩为M =4 .36× 10 14 N·m ;相当于在陆海地壳两端施加的反向力 p =4 .36× 10 8N。这两种跷跷板运动相互加强 ,是青藏高原隆升的基本动力。
Tides and El Nino events make the oceanic water in East Pacific Ocean and West Pacific Ocean going up and down 60 cm oppositely, which makes oceanic crust fall or rise 20 cm. It is the reason why El Nino events are interrelated with the earthquakes and volcanoes. This phenomenon is just like 'seesaw'. The process occurs not only in Pacific Ocean, but also in Indian Ocean. This may be one of the reasons for the uplift of Qinghai--Tibet Plateau. The denudation and sediment also make the crust move like seesaw. According to the calculation, the moment (M) brought to bear on the two sides of continental and oceanic crust in fifty years is about 4.36× 10 14 N·m.
出处
《世界地质》
CAS
CSCD
2003年第2期119-123,共5页
World Geology
基金
国家自然科学基金项目 (批准号 :4 9774 2 2 8)
吉林大学社会科学精品工程项目资助 .
关键词
青藏高原
潮汐
地壳均衡
厄尔尼诺
地震群
Qinghai--Tibet Plateau, tides, isostasy, El Nino, earthquake swarms
