『"West Coast and Alaska Hit by Series of Moderate Earthquakes, Global Seismic Activity Remains High"』のカバーアート

"West Coast and Alaska Hit by Series of Moderate Earthquakes, Global Seismic Activity Remains High"

"West Coast and Alaska Hit by Series of Moderate Earthquakes, Global Seismic Activity Remains High"

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 In the past week, the United States has experienced a series of minor to moderate earthquakes with the most notable activity concentrated along the West Coast and Alaska. According to Earthquake List, a shallow magnitude five point one aftershock struck Saturday afternoon in the North Pacific Ocean, about one hundred forty-seven miles from Coos Bay, Oregon. In the same region, a magnitude five point nine earthquake occurred in the North Pacific, roughly two hundred ten miles from Eugene, Oregon, on Thursday evening. Earlier in the week, a magnitude four point three earthquake struck near Berkeley, California, late on Monday night. That same stretch of the Pacific Ocean witnessed a magnitude five point one aftershock about one hundred seventy miles from Grants Pass, Oregon, on Tuesday afternoon, as well as a magnitude five point eight event one hundred eighty-two miles from Medford, Oregon, on Monday evening.

The frequency and clustering of these moderate offshore events along the Pacific Northwest points to the continued seismic unrest in the Cascadia Subduction Zone, a well-known fault system that produces both local and trans-Pacific tremors. Most of these recent events have been shallow, which typically makes their shaking more noticeable, though none have resulted in significant reported damage or injuries. These offshore quakes occasionally generate widespread concern about the potential for larger events or tsunamis, but so far authorities have not issued major warnings, and overall impact has remained low.

In Alaska, small earthquakes ranging from magnitude two point one to three were recorded northeast of Anchorage over the past two days. This region is one of America’s most seismically active, home to historic major quakes, but this week’s events were minor and did not prompt any emergency response. Throughout the central and eastern United States, seismic activity remains low with only isolated minor tremors reported near Knoxville, Tennessee, and San Antonio, Texas.

Globally, earthquake activity has been much more intense. Wikipedia’s 2025 earthquake summary lists a major magnitude eight point eight quake occurring offshore Kamchatka, Russia, on July twenty-ninth, and a devastating magnitude seven point seven earthquake in Myanmar on March twenty-eighth, causing thousands of fatalities. Other significant global events include deadly earthquakes in Afghanistan and Tibet earlier this year.

VolcanoDiscovery’s October 2025 earthquake report notes that the largest event so far this month worldwide was a magnitude five point eight in the Eastern Central Pacific Ocean, while the overall pattern continues to underscore high seismicity along active margins, particularly around the Pacific Ring of Fire. In summary, while the United States has seen moderate seismic activity this week, major earthquake impacts have been felt elsewhere, highlighting the unpredictable and global nature of seismic hazards.

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