The Pacific's notorious 'Ring of Fire' has delivered another jolt amid a recent burst of seismic activity around the globe's most earthquake-prone region. The US Geological Survey detected a magnitude 5.5 earthquake roughly 140 miles west of the Oregon coast at around 7:35am ET Monday. The earthquake struck deep beneath the Pacific Ocean and there were no immediate reports of damage or injuries. No tsunami warning was issued, although residents in Salem and Rockaway Beach reported feeling the shaking. The latest jolt comes amid a busy stretch for the Pacific Ring of Fire, where a series of moderate to strong earthquakes has rattled regions from Japan and the Philippines to Papua New Guinea, California and South America over the past several days. 

According to the USGS, the recent activity is consistent with the Ring of Fire's frequent seismic behavior. The vast belt is home to about 75 percent of the world's active volcanoes and experiences around 90 percent of the world's earthquakes because several massive tectonic plates are constantly colliding, subducting and sliding past one another. Although Monday's earthquake is not unusual for the region, scientists closely monitor seismic activity along the Pacific Northwest because it sits near the Cascadia Subduction Zone, a major fault capable of producing powerful earthquakes and tsunamis. 

Only five people reported feeling Monday's shaking to the USGS. However, it hit along one of America's most dangerous fault lines, which spans about 600 miles offshore from Cape Mendocino in Northern California up to Northern Vancouver Island in British Columbia, Canada. A 2024 study found that the fault is capable of producing a catastrophic 9-magnitude earthquake, which could generate tsunamis reaching 100 feet or more, kill more than 10,000 people and cause over $80 billion in damages in just Oregon and Washington alone. 

The latest earthquake comes amid an unusually busy few days across the Pacific Ring of Fire, where a series of moderate-to-strong tremors has rattled multiple countries and regions. Between June 24 and June 26, earthquakes struck Japan, the Philippines, Papua New Guinea, California and South America, including two powerful quakes measuring 7.2 and 7.5 off the coast of Venezuela. The two devastating earthquakes that ripped through Venezuela on Wednesday evening flattened buildings in Caracas. At least 1,400 people have been confirmed dead, while tens of thousands are still missing. 

Other notable events included a magnitude 6.9 earthquake near Japan, a 6.5 in the Philippines, a 5.7 near Indonesia, a 5.6 off Northern California and a 5.5 in Papua New Guinea. According to the USGS, however, the recent burst of seismic activity is consistent with the Ring of Fire's normal behavior, as the region sits atop a network of tectonic plates that are constantly colliding, sliding past one another and diving beneath neighboring plates.