M4.3 earthquake 119 km SSW of Nikolski, Alaska

A magnitude 4.3 earthquake struck 119 km SSW of Nikolski, Alaska on Sun, Aug 4, 2019, 10:48 PM AKDT (06:48 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.9 95 km SSE of Nikolski, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.3	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.044 · 147 stations
3.8	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 48 in the 60 days after this one and 7 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us600050qs (also filed as ak0199yzh8c9). Read Sun, Oct 4, 2026, 7:47 PM UTC.