Eli5 why can’t we hear/feel the earth’s magma churning away under our feet always?

Question

The earth is so big, and as I understand, constantly moving and roiling away inside – why isn’t there a constant low level rumble?

In: 6

Answer 1

>Churning away.

The earth’s mantle is mostly solid. The consistency is analogous to stiff clay although much harder and more rigid. It tends to flow only at very slow rates approximately similar to continental drift. Ad

That said, while most earthquakes occur relatively shallow in the earth’s lithospere, as in tens of km, every so often seismometers will pick up earthquakes from deep in the mantle.