As this map shows, the quake hit along an underwater ridge line at 3:41pm — it’s a spot where lots of quakes happen.
24 Hours Of Significant Earthquakes
But what makes the Oregon quake more interesting is the list of other major quakes from April 11 & April 12, 2012—during a mere 24 hours:
- 8.6 magnitude quake near Indonesia (plates sliding instead of lifting, so no tsunami)
- 8.2 aftershock near Indonesia
- 6.5 magnitude quake about 200 miles from Acapulco & Mexico City, Mexico
- 6.9 magnitude quake about 200 miles south of Tijuana, Mexico, in the gulf of California
Quite a list of earthquakes for a mere 24 hours, wouldn’t you say?
Are Earthquakes Related, Do Big Earthquakes Trigger Other Earthquakes?
The answer in this case is most likely ‘no.’ As far as geologists can determine, a big quake in one part of the world does not ‘set off’ another quake somewhere else far away. But there’s a caveat: geologists have determined that a big quake on one fault can trigger a quake on a nearby fault. Or perhaps increase the odds of a quake on a nearby fault.
But just remember–someday it will be Oregon and Washington with the ‘big one’ – a subduction zone off the coast ruptured and causing major damage and a very sudden tsunami. I’m glad this wasn’t our turn.