Earthquake with magnitude of M 3.8 on date 20-05-1985 and time 21:37:25 (Italy) in region Costa Greca Ionica (GRECIA)

A magnitude M 3.8 earthquake occured in region: Costa Greca Ionica (GRECIA), on

  • 20-05-1985 19:37:25 (UTC)
  • 20-05-1985 21:37:25 (UTC +02:00) Italian time
  • 20-05-1985 22:37:25 (UTC +03:00) local time in the region of the earthquake (Europe/Athens)

and geographic coordinates (lat, lon) 38.31, 20.82 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Rev 1000 M 3.8 1985-05-20
38.31 20.82 10 2013-07-15
Bollettino Sismico Italiano INGV 6879
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 1985-05-20 19:37:25 ± 1.082
Latitude 38.31 ± 0.08
Longitude 20.82 ± 0.11
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 6879


Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 12754.3
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 213
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00202
Epicentral distance of station farthest from the epicenter (degree) 0.04331
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information


Field Value
Value 3.8
Num. used stations
Type of magnitude M
Reference to an origin 6879
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:54:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SGO.Z. 1985-05-20T19:38:36.00 10.0 undecidable manual PN 299 0.0433 -1.14 0.6
--.ORI.Z. 1985-05-20T19:38:24.20 10.0 undecidable manual PN 298 0.0342 0.8 0.9
--.KZN.Z. 1985-05-20T19:38:00.50 10.0 undecidable manual PN 19 0.0191 0.27 1.8
--.SRN.Z. 1985-05-20T19:37:54.60 10.0 undecidable manual PN 337 0.0152 0.3 1.8
--.VLS.Z. 1985-05-20T19:37:36.00 10.0 undecidable manual SG 233 0.002 1.76 0.1
--.VLS.Z. 1985-05-20T19:37:29.10 10.0 undecidable manual PG 233 0.002 -1.24 0.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download