Turkey earthquakes

M5.5 earthquake 20 km SE of Alaçat?, Turkey

A magnitude 5.5 earthquake struck 20 km SE of Alaçat?, Turkey on Mon, Oct 17, 2005, 8:45 AM GMT+3 (05:45 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M5.9 9 km WSW of Seferihisar, Turkey. This one was a foreshock.

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Map

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

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The earthquake

Magnitude: 5.5 (Mwc, centroid moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Oct 17, 2005, 8:45 AM GMT+3
UTC: 2005-10-17 05:45:16 UTC
Depth: 8.1 km (5.0 mi), shallow
Epicenter: 38.131° N, 26.505° E
Region: Turkey
Felt reports: 14
Strongest shaking: VII, very strong shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

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
5.5	Mwc, centroid moment	USGS National Earthquake Information Center	Preferred · Reviewed
5.48	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.5	Mwc, centroid moment	Global CMT project	Preliminary

What happened

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

Felt (V) at Izmir. Felt at Kusadasi and Menemen. Felt in Attiki and Evvoia and on Chios, Ikaria, Lesvos and Samos, Greece.

From the USGS event page for usp000e1zy. U.S. Geological Survey text and figures are in the public domain.

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: VII, very strong shaking
Peak ground acceleration: 26.2% of gravity
Peak ground velocity: 2.8 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

14 people reported to the USGS what they felt; the strongest reported shaking was VI, strong shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Strike-slip
Nodal plane 1: Strike 242°, dip 61°, rake -166°
Nodal plane 2: Strike 145°, dip 78°, rake -30°

How well it is located

Reviewed by a seismologist.

Station coverage gap: 17°
Stations used: 439

Nearest places

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

Nearby

Within 100 km, magnitude 2.5 and up: at least 199 in the 60 days after this one and 8 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Turkey earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp000e1zy (also filed as us2005ehaj, gcmtc200510170545a, gcmt20051017054516, atlas20051017054519, iscgem7703990). Read Fri, Oct 2, 2026, 8:06 AM UTC.