根据理论模型推测，地壳在大地震发生前的数小时内很不稳定，但要在现实世界中探测到这样的不稳定性还是个挑战。
Theoretical models predict that the crust is unstable in the hours leading up to a major earthquake, but detecting that instability in the real world has proven a challenge.
地壳聚集足够喷发的岩浆需要数万年的时间，但是一旦准备完毕，这些不稳定的岩浆体就只会在地壳内存在几百年到几千年的时间。
It takes tens of thousands of years for the crust to generate enough eruptible magma, but once formed, these unstable magma bodies only last for centuries to a few millennia.
地壳聚集足够喷发的岩浆需要数万年的时间，但是一旦准备完毕，这些不稳定的岩浆体就只会在地壳内存在几百年到几千年的时间。
It takes tens of thousands of years for the crust to generate enough eruptible magma, but once formed, these unstable magma bodies only last for centuries to a few millennia.
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