Two aftershocks centered in roughly the same area shook Southcentral Alaska late Wednesday morning within a half hour.
The first aftershock, with a reviewed magnitude of 4.1, struck at 11:04 a.m. 13 miles northwest of Joint Base Elmendorf-Richardson, according to the Alaska Earthquake Center.
It was the largest aftershock in just over two weeks.
[The aftershocks keep coming: 4.5 earthquake rumbles through Southcentral Alaska]
A second, smaller quake, centered a few miles south of the first, followed 23 minutes later with a reviewed magnitude of 3.7.
Reviewed magnitude is 3.7 as well. Larger red dot is the M4.1 at 11:04am, smaller is the M3.7 at 11:27am. pic.twitter.com/Bialwthjnk
— AK Earthquake Center (@AKearthquake) February 6, 2019
Both epicenters were located at the southern end of a 20-mile-long “fault patch,” roughly underneath Point MacKenzie. More than 8,000 aftershocks have originated there since the Nov. 30 main shock.
[Why are different quake magnitudes reported, and when do these stop being aftershocks?]
Both quakes also struck at a similar depth. The earthquake center estimates the first hit about 26 miles down, while the second was 21 miles.
Seismologists expect the region to continue rumbling until at least September.