Earthquake with magnitude of Md 3.1 on date 04-07-1987 and time 10:39:39 (Italy) in region Tirreno Meridionale (MARE)

A magnitude Md 3.1 earthquake occured in region: Tirreno Meridionale (MARE), on

  • 04-07-1987 08:39:39 (UTC)
  • 04-07-1987 10:39:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 38.43, 12.44 at 1 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

An earthquake occurred to
47 Km N of Trapani (68759 inhabitants)
71 Km N of Marsala (83194 inhabitants)
88 Km N of Mazara del Vallo (51718 inhabitants)
88 Km W of Palermo (674435 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 Md 3.1
ML-VAX 3.2
1987-07-04
08:39:39
38.43 12.44 1 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 50359
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-07-04 08:39:39 ± 0.454
Latitude 38.43 ± 0.02
Longitude 12.44 ± 0.03
Depth (km) 1 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 50359

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) 3200.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 156
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00372
Epicentral distance of station farthest from the epicenter (degree) 0.06055
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitudes information

Md:3.1

Field Value
Value 3.1
Uncertainty
Num. used stations 8
Type of magnitude Md
Reference to an origin 50359
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:49:00

ML:3.2

Field Value
Value 3.2
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 50359
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CVF.Z. 1987-07-04T08:41:49.30 10.0 undecidable manual SN 328 0.0444 -0.56 0.4
--.FRF.Z. 1987-07-04T08:41:18.70 10.0 undecidable manual PN 321 0.0605 -0.64 0.7
--.LMR.Z. 1987-07-04T08:41:17.10 10.0 undecidable manual PN 319 0.0597 -0.92 0.4
--.SBF.Z. 1987-07-04T08:41:17.50 10.0 undecidable manual PN 327 0.0594 -0.07 1.2
--.FIN.Z. 1987-07-04T08:41:17.40 10.0 undecidable manual PN 332 0.0593 0.07 1.2
--.CVF.Z. 1987-07-04T08:40:55.70 10.0 undecidable manual PN 328 0.0444 0.95 0.5
--.MEU.Z. 1987-07-04T08:40:47.31 10.0 undecidable manual SN 124 0.0207 0.05 0.7
--.MAO.Z. 1987-07-04T08:40:44.80 10.0 undecidable manual PN 346 0.0368 0.89 0.6
--.SGO.Z. 1987-07-04T08:40:29.50 10.0 undecidable manual PN 45 0.0276 0.45 1.4
--.SO9.Z. 1987-07-04T08:40:26.79 10.0 undecidable manual PN 96 0.0257 0.56 1.3
--.PZI.Z. 1987-07-04T08:40:20.37 10.0 undecidable manual PN 124 0.0217 0.29 1.7
--.MEU.Z. 1987-07-04T08:40:19.31 10.0 undecidable manual PN 124 0.0207 0.71 1
--.ATN.Z. 1987-07-04T08:40:18.79 10.0 undecidable manual PN 95 0.0215 -0.94 0.6
--.MNO.Z. 1987-07-04T08:40:11.81 10.0 undecidable manual PN 105 0.0166 -0.43 1.5
--.CVT.Z. 1987-07-04T08:40:09.00 10.0 undecidable manual SG 159 0.0072 0.04 0.7
--.FAI.Z. 1987-07-04T08:40:08.00 10.0 undecidable manual PN 139 0.0136 0.26 1.7
--.GIB.Z. 1987-07-04T08:40:03.89 10.0 undecidable manual PN 109 0.0119 -1.24 0.3
--.CVT.Z. 1987-07-04T08:39:57.10 10.0 undecidable manual PG 159 0.0072 0.52 1.3
--.ERC.Z. 1987-07-04T08:39:48.39 10.0 undecidable manual PG 163 0.0037 -0.29 1.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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