Quake swarm is one for the history books

BONNERS FERRY — When the dishes and windows rattled and the house shook for 10 to 15 seconds my first thought was a major train derailment. But then I realized it might have been an earthquake.

An earthquake in North Idaho? Sure enough, the U.S. Geological Society reported a quake within a few minutes on their website. A 4.1 magnitude earthquake 22km southeast of Sandpoint (vicinity of the Green Monarchs) at 7:32 p.m. on Thursday, April 23.

Then a swarm of five earthquakes happened over the next 17 hours, all in the vicinity of Lake Pend Oreille. The USGS revised the data by Saturday to reflect new magnitudes, including reducing the initial earthquake to magnitude 3.7. Revisions often are made as more data is gathered from seismograph stations around the world.

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