Then...
https://www.nationalgeographic.com/science/2018/11/strange-earthquake-waves-rippled-around-world-earth-geology/
" (Snip) For now, though, the lack of data makes it tough to say more about the wiggly forms. Hicks' preliminary models hinted that the waves emanated from subsurface inflation, rather than a magma chamber draining or collapsing. But with a little additional data, the model flipped and pointed to chamber deflation instead.
It also could be a bit of both, notes Robinson: “Some collapse mechanisms, you can get inflation and deflation occurring at the same time,” she says. Or sometimes they can alternate, pumping up and down like Earth's fiery lungs.
It is very difficult, really, to say what the cause is and whether anyone's theories are correct—whether even what I'm saying has any relevance to the outcome of what's going on,” Robinson says." TBD
