Greece earthquakes

M5.3 earthquake 11 km S of Astakós, Greece

A magnitude 5.3 earthquake struck 11 km S of Astakós, Greece on Wed, Jun 26, 1991, 2:43 PM GMT+3 (11:43 UTC), 40 km (25 mi) below the surface.

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The earthquake

Magnitude: 5.3 (Mw, moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Jun 26, 1991, 2:43 PM GMT+3
UTC: 1991-06-26 11:43:35 UTC
Depth: 39.5 km (24.5 mi), shallow
Epicenter: 38.435° N, 21.098° E
Region: Greece
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
5.3	Mw, moment	USGS National Earthquake Information Center	Preferred · Reviewed
5.28	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.3	Mwc, centroid moment	Global CMT project	Preliminary

What happened

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

Felt on Ithaki. CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 17S, 29C Centroid Location: Origin Time 11:43:44.4 0.7 Lat 38.42N FIX;Lon 21.17E FIX Dep 31.0 FIX Half-duration 1.6 Moment Tensor; Scale 10**16 Nm Mrr=-9.23 0.54 Mtt=9.05 0.84 Mff=0.18 0.82 Mrt=-0.08 1.57 Mrf=-0.95 1.38 Mtf=-4.34 0.62 Principal Axes: (T) Val=10.82 Plg=1 Azm=22 (N) Val=-1.49 Plg=7 Azm=112 (P) Val=-9.34 Plg=83 Azm=285 Best Double Couple:Mo=1.0*10**17 NP1:Strike=105 Dip=45 Slip=-100 NP2:Strike=299 Dip=46 Slip=-81

From the USGS event page for usp0004te6. U.S. Geological Survey text and figures are in the public domain.

Did you feel it?

No one has reported feeling this quake to the USGS.

Nearest places

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

Nearby

Within 100 km, magnitude 2.3 and up: 37 in the 60 days after this one and 17 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0004te6 (also filed as gcmtb062691b, gcmt19910626114334, iscgem330176). Read Fri, Oct 2, 2026, 11:54 AM UTC.