『"Earthquake Activity Persists Across U.S. West Coast and Alaska, Scientists Monitor Ongoing Seismic Trends"』のカバーアート

"Earthquake Activity Persists Across U.S. West Coast and Alaska, Scientists Monitor Ongoing Seismic Trends"

"Earthquake Activity Persists Across U.S. West Coast and Alaska, Scientists Monitor Ongoing Seismic Trends"

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 Over the past week, the United States has experienced a series of smaller earthquakes concentrated primarily along the West Coast and in Alaska, with no major destructive events but with ongoing seismic activity that continues to draw attention from scientists and residents alike. Earthquakelist dot org documents several minor earthquakes, such as a magnitude 2.3 event occurring 56 miles north-northeast of Portland on October 14, followed by several others near Bakersfield, Eureka, and Santa Rosa in California. Alaska has also seen multiple small quakes southwest and northwest of Anchorage, including minor tremors as recently as October 14.

In addition to these, Hawaii remains active, with shocks south of Hilo recorded throughout the week. Notably, a magnitude 4.3 quake occurred near Berkeley, California, on Monday night, and another with similar magnitude struck near Fontana, highlighting the ongoing risk in northern and southern California. Several offshore events in the North Pacific Ocean were felt in the United States as well, including a shallow magnitude 5.9 quake about 210 miles from Eugene, Oregon, and a magnitude 5.7 earthquake 165 miles from Grants Pass. These offshore tremors underline the persistent seismic activity along the boundary between the Pacific and North American tectonic plates.

According to the United States Geological Survey, no high-magnitude, damaging earthquakes have occurred directly within the contiguous United States this past week, but the regular pattern of low-magnitude seismicity fits the long-term trend. On average, the United States experiences a significant number of earthquakes each year, with around 176 events of magnitude four or above happening annually within a 300 kilometer radius of the country, according to long-term data from Earthquakelist dot org. The strongest earthquake in the region over the last decade was the magnitude 7.1 Ridgecrest earthquake that struck near Los Angeles in 2019, but so far in 2025, the nation has mostly seen minor quakes.

Exploring global trends, the British Geological Survey and Wikipedia earthquake list report two major events worldwide in the last week. On October 10, the Drake Passage off Antarctica was struck by a magnitude 7.6 quake, while the Philippines experienced a magnitude 7.4 event near Davao Oriental, which resulted in casualties and drew international concern. These illustrate that while recent U.S. activity is relatively moderate, seismic hazards remain significant elsewhere.

A continuing subject of scientific study centers on the potential for synchronized major earthquakes along California's San Andreas Fault and the Cascadia subduction zone. Recent research discussed by Science magazine highlights how complex interactions between these fault systems could result in rare but catastrophic one-two punch scenarios, reinforcing the need for vigilance and preparation on the U.S. West Coast. This ongoing research and steady stream of minor events ensure earthquakes remain a key national concern.

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This content was created in partnership and with the help of Artificial Intelligence AI
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