M4.0 earthquake 20 km SE of Alaçat?, Turkey

A magnitude 4.0 earthquake struck 20 km SE of Alaçat?, Turkey on Fri, Oct 21, 2005, 1:15 AM GMT+3 (22:15 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M4.5 22 km W of Seferihisar, Turkey. This one was a foreshock.

Map

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

The USGS’s account of the effects of this earthquake.

no people dead or missing; no people injured; no buildings damaged or destroyed

From the USGS event page for usp000e2bu. U.S. Geological Survey text and figures are in the public domain.

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: at least 199 in the 60 days after this one and 125 in the 30 days before it.

The first 60 of at least 199.

From the USGS Earthquake Hazards Program and its partner networks, event usp000e2bu. Read Thu, Oct 1, 2026, 4:52 PM UTC.