Earthquake with magnitude of M 4.0 on date 23-07-1986 and time 01:40:57 (Italy) in region Mar Ionio Meridionale (MARE)

A magnitude M 4.0 earthquake occured in region: Mar Ionio Meridionale (MARE), on

  • 22-07-1986 23:40:57 (UTC)
  • 23-07-1986 01:40:57 (UTC +02:00) Italian time
  • 23-07-1986 02:40:57 (UTC +03:00) local time in the region of the earthquake (Europe/Athens)

and geographic coordinates (lat, lon) 37.78, 20.35 at 120 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 1986-07-22
23:40:57
37.78 20.35 121 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 31409
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-07-22 23:40:57 ± 0.616
Latitude 37.78 ± 0.03
Longitude 20.35 ± 0.02
Depth (km) 121 ± 16 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 31409

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) 3500.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 189
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.02396
Epicentral distance of station farthest from the epicenter (degree) 0.09455
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

M:4

Field Value
Value 4
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 31409
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:30:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CTI.Z. 1986-07-22T23:43:26.00 10.0 undecidable manual P 327 0.0945 0.43 0.7
--.FO1.Z. 1986-07-22T23:43:25.50 10.0 undecidable manual P 332 0.0941 0.5 0.3
--.KBN.Z. 1986-07-22T23:42:15.00 10.0 undecidable manual S 8 0.0257 0.41 0.3
--.GIB.Z. 1986-07-22T23:42:10.00 10.0 undecidable manual P 276 0.0448 -0.32 1.1
--.SGO.Z. 1986-07-22T23:42:08.00 10.0 undecidable manual P 309 0.0431 0.31 1.1
--.MG9.Z. 1986-07-22T23:42:02.00 10.0 undecidable manual P 305 0.0397 -0.47 0.8
--.PHP.Z. 1986-07-22T23:41:54.60 10.0 undecidable manual P 3 0.0351 -1.06 0.1
--.TS9.Z. 1986-07-22T23:41:52.00 10.0 undecidable manual P 304 0.0328 -0.23 1.2
--.TIR.Z. 1986-07-22T23:41:50.60 10.0 undecidable manual P 356 0.0322 -0.8 0.5
--.SO9.Z. 1986-07-22T23:41:49.00 10.0 negative manual P 278 0.0305 0.09 2.9
--.GR9.Z. 1986-07-22T23:41:47.00 10.0 undecidable manual P 291 0.0291 0.14 1.4
--.LCI.Z. 1986-07-22T23:41:45.00 10.0 undecidable manual P 328 0.0278 0.2 1.3
--.KBN.Z. 1986-07-22T23:41:42.20 10.0 undecidable manual P 8 0.0257 0.4 0.8
--.KZN.Z. 1986-07-22T23:41:40.00 10.0 undecidable manual P 25 0.0248 -0.41 1.2
--.ATH.Z. 1986-07-22T23:41:39.40 10.0 undecidable manual P 86 0.024 0.19 1.3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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