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火山是由地震形成的吗?

我知道有些地震是由火山引起的，有些地震会在地震发生地附近引发火山爆发。

但是如果大地震(8.0级以上)发生并导致断层带出现怎么办?如果同一地区发生任何震级的更多地震，断层线就会越来越深，直到地幔暴露出来。然后地幔中的压力被释放，熔岩开始从断层线流出。多年以后，无论是在水下还是在内陆，都会形成一个山脊。

但真的有火山是由地震形成的吗?

回答

从你写的东西中，你假设了几件事:1。地幔是由熔化的岩石构成的。断层可以深入到地幔。两者都不完全准确。熔岩开始流出地球的地幔大部分是固体。它有部分熔融的区域，这就是一些火山喷发的熔岩的来源。但大多数情况下，它是固态的。即使你在那里确实有一条断层线，它也不会释放任何熔岩，因为它一开始就不在那里。>……断层线会越来越深…… Faults can not go too deep. As you go deeper in the earth, rocks stop being brittle and become ductile. They don't break, the flow. Think of chocolate - if you take out chocolate from the freezer you can shatter it to pieces. If you put it in the sun, it bends instead of breaking. Same thing with rocks. > I know that some earthquakes are caused by volcanoes The movement of molten rock (magma) underground is the cause of volcanos and earthquakes associated with volcanos. Note that these kinds of earthquakes are usually very weak and their destructive power is very small, at least compared to the actual volcanic eruption. > some earthquakes can trigger volcanic eruptions Not really - only if it's a big earthquake you had molten rock around. Which brings me to the next point... Having said that - actually most of the volcanic eruptions on Earth in fault lines where decompression of mantle occurs. These are the mid ocean ridges that look like this: [![enter image description here][1]][1]<sup>Source: Pearson Prentice Hall (?)</sup> And are located here: [![enter image description here][2]][2]<sup>Source: USGS</sup> In the case of mid ocean ridges, you basically have mantle rock melting because of decompression, and this is occurring at fault lines with earthquakes. However, the location where all of this is known and it's all pretty expected. It's also in mid ocean ridges (except Iceland) so the danger to us humans is negligible. Other than those cases, the chances of having a surprise magnitude 8 earthquake with a volcano erupting after it are very low. [1]: http://i.stack.imgur.com/sxBzj.jpg [2]: http://i.stack.imgur.com/YZCpv.gif

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\ begingroup美元有一种可能的方法，当冲击波汇聚到地球的另一边时，超大的火流星撞击可能会产生火山，因为冲击波稍微不同步，会导致巨大的断层，只要有可以支撑横波的物质，断层就会向下延伸。在这种情况下，地震是其他事情的副作用，但它们是造成火山的原因。 \ endgroup美元
- - - - - -约翰
2018年4月24日4:35

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