The red star marks where the Sumatra quake hit. USGS
Are Four Big Quakes In Two Days Connected? -- MSNBC/Live Science
Shaking from Sumatra quake picked up by US seismic monitoring stations.
The 8.6-magnitude earthquake that hit off the coast of Sumatra, Indonesia Wednesday was followed by several decent-size shakes along the west coast of North America, but researchers can't say for certain whether all the temblors were related.
It's possible, geophysicists say, that quakes off the coast of Oregon, Michoacan, Mexico, and in the Gulf of California ranging from magnitudes 5.9 to 6.9 on the Richter Scale had something to do with the large earthquake that struck near Indonesia. But the West Coast quakes were fairly standard for their location.
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Mu Comment: Talk about coincidences .... 4 major quakes in two days.