Swarm of 50+ earthquakes rumbles off Oregon coast

A series of more than 50 earthquakes off the Oregon coast were recorded Tuesday and Wednesday, but they are not expected to trigger a much larger quake.
The earthquakes ranged in strength, with many between a 4.0 and 5.8 magnitude. The U.S. Geological Survey recorded over 50 in a 24-hour period.
All the earthquakes were recorded about 6 miles below the surface. No injuries or damage was reported by the USGS.
There was no tsunami threat following the earthquakes. Portland State University geology professor Scott Burns said you typically need an 8.0-magnitude quake or above to see a tsunami threat.