An earthquake of magnitude 1.7 occurred near Glennallen, Alaska, on November 26, 2024. The quake was registered at a depth of 12.4 miles and has yet to be reviewed by seismologists. Southcentral Alaska is tectonically active, with various structures contributing to its seismicity, evidenced by significant past earthquakes.
On November 26, 2024, an earthquake registering a magnitude of 1.7 struck approximately 45 miles southwest of Glennallen, Alaska, at 12:37:40 AKST. The seismic event occurred at a depth of 12.4 miles (20 km). As of this report, the event remains unverified by seismologists. This minor earthquake is notable as it occurred in a tectonically active area where various fault systems interact, contributing to significant seismic activity in Southcentral Alaska. Previous substantial events in the region include the 1964 M9.2 Great Alaska Earthquake and the recent 2016 and 2018 M7.1 earthquakes that caused considerable disturbance and damage.
Southcentral Alaska is characterized by complex tectonic features responsible for generating earthquakes. The primary source of the strongest earthquakes in this region is the megathrust fault between the Pacific and North American plates. Beneath this surface interaction, the Wadati-Benioff Zone accounts for intermediate-depth earthquakes as the Pacific Plate descends into the mantle. Additionally, crustal seismicity arises from multiple geological structures, such as the Castle Mountain Fault. These tectonic elements combined create a dynamic seismic environment with ongoing earthquake risks.
In conclusion, the recent magnitude 1.7 earthquake near Glennallen serves as a reminder of the ongoing seismic activity prevalent in Southcentral Alaska. Understanding the tectonic setting, including the associated megathrust faults and intermediate-depth seismicity, is crucial in assessing earthquake risks in the region. The historical context of significant earthquakes indicates the potential for substantial seismic events, highlighting the importance of ongoing monitoring and preparedness efforts.
Original Source: earthquake.alaska.edu
