A Magnitude 5.9 earthquake rumbled off the Oregon Coast at 11:45 p.m. Thursday, according to the U.S. Geological Survey. The relatively large temblor, taking place some 230 miles west of Bandon, was followed by another, possibly related Magnitude 3.0 quake nearby in the Pacific Ocean.

Twelve people have reported to the Geological Survey that they felt the first quake, which is officially designated as “moderate.”

No tsunami is expected, but the USGS forecasts a high probability of more aftershocks.

There’s about a 37% chance that a mega-earthquake along the Cascadia Subduction Zone off the Oregon and Washington coasts will happen in the next 50 years, according to the Oregon Department of Emergency Management.

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