Why are so many earthquake swarms suddenly happening all along the Ring of Fire? For those that don't know, the Ring of Fire is a series of fault zones that run roughly along the perimeter of the Pacific Ocean. 75 percent of the Earth's active.
A swarm of more than 55 earthquakes rattled the ocean floor off the Oregon coast in the past two days, but seismologists say it is "nothing to be alarmed about".
A swarm of earthquakes led some people to worry that the seismic activity might portend The Big One. But seismologists say that given the location of the quakes, there was no cause for alarm.