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西藏改则县发生4.1级地震 震源深度6千米

2017-09-03 07:00:51   中国青年网

可以说,青藏高原是整个中国中、西部地质运动的发动机,来自印度板块的力量源源不断地输送到高原,再由高原传递到中国内部,带来了一次又一次惨痛的地震灾害。在将来,地震仍会像现在这样不期而至,我们要做的,就是时刻做好准备,降低地震带来的损失。

九寨沟地震和汶川地震有关吗?

前几年的汶川地震和芦山地震不是已经释放应力了吗,为什么还有地震?我们现在就来看看这两次地震有什么关系,四川又因为什么样的构造使得它地震频发。

其实,从大的背景来分析,汶川地震和九寨沟地震都是高原向四周扩张与周围地块发生挤压作用的结果。但从细节上又有很大的不同。

2008年的汶川地震发生在龙门山断裂带上,这是青藏高原和四川盆地相互作用的最前沿。龙门山断裂带整体走向是东北—西南向,而且是一条逆断层,从高原向盆地逆冲。而本次九寨沟地震,震中并不在龙门山断裂带上,而是在它的北方。发生的九寨沟地震的断层方向走向为西北—东南向,可能是虎牙断裂,与龙门山断裂带近乎垂直。而且,这是一条走滑断层,即断层的两边在水平方向上反方向滑动。所以,两次地震并没有太大的关系,是两次独立的地震。

我们从上面的分析不难发现,两次地震发生在不同的断裂带上,汶川地震只是释放了龙门山断裂带上的应力,但对九寨沟地震所在的断层影响并不大。而在四川,类似的断层还有很多条,比如甘孜州的鲜水河—安宁河断裂,阿坝州北部的塔藏断裂、西部的龙日坝断裂,以及本次地震的虎牙断裂以及沿岷江展布的岷江断裂。这些都是非常活跃的断裂,历史上都发生过巨大的地震。而且,这些断裂还控制了许多的次级断裂,会发生很多中等强度的地震。这就是为什么四川一直多地震的原因。来源:北京日报微信公众号猜你会好奇作者贾斌


责任编辑:孙启浩 CN037
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