Magnitude 1.6 Earthquake Near Chenega Bay: A Seismic Overview

An earthquake of magnitude 1.6 struck 37 miles east of Chenega Bay, Alaska, on October 4, 2024, at a depth of 12.1 miles. This event underscores the tectonic complexities of Southcentral Alaska, where numerous geological factors contribute to seismic activity.

On October 4, 2024, at 05:14:30 AKDT (13:14:30 UTC), an earthquake of magnitude 1.6 occurred approximately 37 miles east of Chenega Bay, Alaska, at a depth of 12.1 miles (19 km). This seismic event has yet to undergo a thorough evaluation by a seismologist. The epicenter of the tremor is situated 46 miles (74 km) south of Tatitlek and 47 miles (76 km) southwest of Cordova, among other notable locations. The significance of this occurrence reflects the complex tectonic landscape of the Southcentral Alaska region, where earthquakes derive from various geological features and fault lines. Understanding these geophysical dynamics is crucial for assessing their impact on local communities and ensuring preparedness against future seismic events.

The southern region of Alaska is noted for its seismic activity, primarily due to the interaction of the Pacific and North American tectonic plates. In particular, the megathrust fault, which delineates the zone where the Pacific Plate subducts beneath the North American Plate, is responsible for some of the most powerful earthquakes recorded, such as the monumental 1964 M9.2 Great Alaska Earthquake. Moreover, the Wadati-Benioff Zone, associated with intermediate-depth seismicity, contributes to the regional earthquake profile, alongside crustal seismicity from local faults like the Castle Mountain Fault and the geological structures in the Cook Inlet basin. This multifaceted tectonic environment necessitates ongoing research and monitoring to mitigate risks associated with potential seismic events.

In summary, the magnitude 1.6 earthquake that occurred near Chenega Bay highlights the seismic character of Southcentral Alaska, influenced by the region’s complex tectonic features. Detailed studies and continuous monitoring are essential to understand the implications of such earthquakes on public safety and infrastructure, particularly given the history of significant seismic activity in the area.

Original Source: earthquake.alaska.edu