Overview of the Magnitude 1.7 Earthquake Near Glennallen, Alaska

A magnitude 1.7 earthquake struck 45 miles southwest of Glennallen, Alaska, on November 26, 2024, at 12:37 AKST. Recorded at a depth of 12.4 miles, this event has not yet undergone seismological review. The tectonic setting of southern Alaska, associated with both megathrust faults and crustal seismicity, influences these events.

On November 26, 2024, at 12:37 AKST, a magnitude 1.7 earthquake occurred approximately 45 miles southwest of Glennallen, Alaska. The earthquake was recorded at a depth of 12.4 miles (20 km) and has not yet been reviewed by a seismologist. Notably, this seismic event was located 46 miles (74 km) southwest of Pump Station 11, 48 miles (77 km) west of Copper Center, and approximately 112 miles (181 km) east of Anchorage. Such seismic activities are common in the region due to the complex tectonic setting prevalent throughout southern Alaska.

Southern Alaska is marked by various tectonic dynamics that contribute to its seismic activity. The region experiences significant earthquakes primarily from the megathrust fault where the Pacific Plate is subducting beneath the North American Plate, evidenced by historical events such as the 1964 M9.2 Great Alaska Earthquake. Additionally, intermediate-depth seismicity occurs within the Wadati-Benioff Zone, impacting the structural integrity of this region. Crustal seismicity further encompasses fault systems within the vicinity, such as the Cook Inlet basin and the Castle Mountain Fault.

In summary, the recent magnitude 1.7 earthquake near Glennallen is indicative of the ongoing seismic activity characteristic of southern Alaska’s tectonic landscape. Such events arise from complex interactions among various geological structures, underscoring the importance of ongoing monitoring and research in the region. Additionally, greater awareness regarding the tectonic features can enhance preparedness for future seismic occurrences.

Original Source: earthquake.alaska.edu