New evidence for geologically recent earthquakes near Portland, Oregon metro area — ScienceDaily
A paleoseismic trench dug across the Gales Creek fault, located about 35 kilometers (roughly 22 miles) west of Portland, Oregon, documents evidence for three surface-rupturing earthquakes that took place about 8,800, 4,200 and 1,000 years ago. The findings, published in the Bulletin of the Seismological Society of America, suggest that earthquakes occur about every 4,000 […]
