Oregon State University new study suggest; big earthquakes follow a brief episode of “shallow mantle creep” and “seismic swarms.” This explains the foreshocks observed before temblors. The research involved the Blanco Transform Fault off the coast of Oregon.
For more info, please read the original article by LA Times:
https://phys.org/news/2019-01-silent-fault-line-prelude-big.html
