『Alaskan Earthquakes Rattle the US: Ongoing Seismic Activity Highlights Regional Risks』のカバーアート

Alaskan Earthquakes Rattle the US: Ongoing Seismic Activity Highlights Regional Risks

Alaskan Earthquakes Rattle the US: Ongoing Seismic Activity Highlights Regional Risks

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概要

 In the past week, the United States has experienced numerous earthquakes, primarily small to moderate in magnitude, with Alaska and other regions showing heightened activity. On February 10, a magnitude 4.7 earthquake struck near Meadow Lakes, Alaska, eight kilometers north-northwest of the area, at a depth of about 18 kilometers, according to USGS data. This event caused notable shaking across parts of Alaska, reminiscent of historical seismic risks in the region, though no major damage was immediately reported.

Alaska continued to dominate recent activity. Volcano Discovery reports a possible seismic event near Salt Lake City, Utah, but multiple quakes rattled Alaska on February 13, including a magnitude 3.1 tremor 134 miles north-northwest of Anchorage at 6:04 PM local time, a 2.7 at 29 miles north of Anchorage, and a 3.2 at 139 miles north, per Earthquake List. These align with over 200 minor quakes detected near the US in 2026 so far, many in tectonically active zones like the Aleutian chain.

Further south, a magnitude 3.5 quake hit two miles north-northwest of West Valley City, Utah, on February 13 at 6:32 PM Denver time. In California, a 2.5 magnitude event occurred 24 miles west-southwest of Eureka that afternoon. Hawaii saw several off Hilo, including 2.7 and 2.6 magnitudes south-southwest of the city. Inland, a 2.8 tremor struck 12 miles west-northwest of Columbia, South Carolina, and a 2.7 near Lubbock, Texas.

Notably, Great Falls, Montana, felt another small earthquake on February 12 at 6:36 PM, the fourth in two weeks, as reported by KRTV news, suggesting a local swarm pattern in this intraplate area. Volcano Discovery's world report for February 12 lists over 900 quakes globally that week, but US events remain mostly below magnitude 4, with 362 magnitude 2.5-plus quakes per USGS past-week data.

No magnitude 6 or higher events hit the US in this period, per Wikipedia's 2026 list and IRIS monitors, but patterns indicate persistent activity in Alaska due to subduction zones and emerging clusters in the Rockies and Pacific states. Earthquake List notes an average of 14 magnitude 4-plus quakes monthly near the US, underscoring steady seismic hazard without escalation to major events this week. Worldwide, a magnitude 6.4 off Japan was the strongest recent, but US focus reveals routine, low-impact shaking.

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