ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of M 4.0 on date 11-04-1985 and time 14:29:58 (Italy) in region Greece [Sea]

A magnitude M 4.0 earthquake occured in region: Greece [Sea], on

  • 11-04-1985 12:29:58 (UTC)
  • 11-04-1985 14:29:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 39.03, 20.64 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
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 M 4.0 1985-04-11
12:29:58
39.03 20.64 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 4519
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-11 12:29:58 ± 0.618
Latitude 39.03 ± 0.05
Longitude 20.64 ± 0.04
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 4519

Uncertainty

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) 6864.4
Confidence level of the uncertainty (%) 68

Quality

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 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.01392
Epicentral distance of station farthest from the epicenter (degree) 0.0718
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitude information

M:4

Field Value
Value 4
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 4519
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:50:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CH1.Z. 1985-04-11T12:31:55.00 10.0 undecidable manual PN 308 0.0718 0.77 0.7
--.AS1.Z. 1985-04-11T12:31:45.00 10.0 undecidable manual PN 307 0.0652 0.85 0.7
--.AR1.Z. 1985-04-11T12:31:44.00 10.0 undecidable manual PN 311 0.0657 -1.01 0.6
--.ALP.Z. 1985-04-11T12:31:34.00 10.0 undecidable manual PN 308 0.0587 -0.29 1.2
--.GIB.Z. 1985-04-11T12:31:17.50 10.0 undecidable manual PN 261 0.0474 0.45 1.2
--.SOR.Z. 1985-04-11T12:31:13.80 10.0 undecidable manual PN 290 0.0457 -0.64 1.1
--.PA1.Z. 1985-04-11T12:31:11.50 10.0 undecidable manual PN 248 0.0443 -0.82 0.9
--.TR9.Z. 1985-04-11T12:31:09.70 10.0 undecidable manual PN 298 0.0414 1.82 0.2
--.MS1.Z. 1985-04-11T12:31:05.00 10.0 undecidable manual PN 309 0.0401 -1 0.7
--.BRY.Z. 1985-04-11T12:31:02.50 10.0 undecidable manual PN 339 0.0376 0.4 1.4
--.HCY.Z. 1985-04-11T12:30:55.00 10.0 undecidable manual PN 336 0.034 -1.63 0.2
--.BAI.Z. 1985-04-11T12:30:53.50 10.0 undecidable manual PN 307 0.0319 0.11 1.5
--.TTG.Z. 1985-04-11T12:30:53.00 10.0 undecidable manual PN 344 0.032 -0.52 1.3
--.BRT.Z. 1985-04-11T12:30:49.00 10.0 undecidable manual PN 306 0.0292 -0.29 1.4
--.SKO.Z. 1985-04-11T12:30:46.40 10.0 undecidable manual PN 12 0.027 0.45 1.3
--.VAY.Z. 1985-04-11T12:30:42.30 10.0 undecidable manual PN 32 0.0245 0.19 1.5
--.LCI.Z. 1985-04-11T12:30:38.00 10.0 undecidable manual PN 305 0.021 1.18 0.6
--.KZN.Z. 1985-04-11T12:30:26.00 10.0 undecidable manual PN 34 0.0139 0.07 1.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download