Medium
on Nov 16 and 18, 2004
from USGS

Nov 16, Charters Towers, Australia	Nov 16, Honiara, Solomon Islands
Nov 18, Port Moresby, New Guinea	Nov 18, Ulaanbaatar, Mongolia

Note: Whiplash Sweeps bump first the Dark Twin toward Earth, then the Earth toward Planet X, and within a couple days Planet X hops over the Sweeping Arm thus pushing Earth again, and finally Earth collides again with her Dark Twin behind her.