Earthquake with magnitude of mb 5.1 on date 18-12-2021 and time 05:16:39 (UTC) in region Southern Greece [Sea: Greece]

A magnitude mb 5.1 earthquake occured in region: Southern Greece [Sea: Greece], on

  • 18-12-2021 05:16:39 (UTC)
  • 18-12-2021 06:16:39 (UTC +01:00) Italian time
  • 18-12-2021 07:16:39 (UTC +02:00) local time in the region of the earthquake (Europe/Athens)

and geographic coordinates (lat, lon) 36.1350, 23.0520 at 55 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 inhabitants.

Recent and historical seismicity
Seismic hazard
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
mb 5.1
Mwp 4.8
36.1354 23.0515 55 2021-12-18
Sala Sismica INGV-Roma 98644311
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-12-18 05:16:39
Latitude 36.1354
Longitude 23.0515
Depth (km) 55 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 98644311


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 3625
Semi-minor axis of confidence ellipse (meter) 2287
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 11
Circular confidence region, given by single value of horizontal uncertainty (meter) 3463.9
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 110.784
Number of associated phases, regardless of their use for origin computation 1
Number of defining phases 1
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 1.43909
Epicentral distance of station closest to the epicenter (degree)
Epicentral distance of station farthest from the epicenter (degree)
Number of stations at which the event was observed 0
Number of stations from which data was used for origin computation 0
Magnitudes information


Field Value
Value 4.8
Uncertainty 0.1
Num. used stations 7
Type of magnitude Mwp
Reference to an origin 98644311
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-12-18 05:29:47


Field Value
Value 5.1
Uncertainty 0.2
Num. used stations 62
Type of magnitude mb
Reference to an origin 98644311
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2021-12-18 05:29:47
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download