Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 20-12-1987 and time 14:59:09 (Italy) in region Confine Italia Francia (FRANCIA)

A magnitude Md 2.5 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 20-12-1987 13:59:09 (UTC)
  • 20-12-1987 14:59:09 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0590, 7.1710 at 12 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.

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Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
48 Km SW of Cuneo (56081 inhabitants)
56 Km W of Sanremo (54807 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
Bulletin
Rev1000 		Md 2.5 1987-12-20
13:59:09		 44.059 7.171 12 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 59849
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-12-20 13:59:09 ± 0.124
Latitude 44.0590 ± 0.0077
Longitude 7.1710 ± 0.0129
Depth (km) 12 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 59849

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) 1343.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 116
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 31
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00194
Epicentral distance of station farthest from the epicenter (degree) 0.01740
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 59849
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:57:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.LSD.Z. 1987-12-20T13:59:54.50 10.0 undecidable manual SN 359 1.3875 1.36 0
--.RSP.Z. 1987-12-20T13:59:46.00 10.0 undecidable manual SN 3 1.0878 0.09 0.7
--.BNI.Z. 1987-12-20T13:59:44.50 10.0 undecidable manual SN 340 1.0545 -0.43 0.5
--.CVF.Z. 1987-12-20T13:59:42.90 10.0 undecidable manual PN 139 1.9314 -0.14 1.2
--.RRL.Z. 1987-12-20T13:59:40.10 10.0 undecidable manual SG 342 0.8991 -0.66 0.4
--.CKI.Z. 1987-12-20T13:59:38.50 10.0 undecidable manual SG 65 0.8658 -1.26 0.1
--.LRG.Z. 1987-12-20T13:59:38.40 10.0 undecidable manual SG 224 0.8325 -0.36 0.7
--.LMR.Z. 1987-12-20T13:59:38.70 10.0 undecidable manual SG 213 0.8658 -0.91 0.2
--.FIN.Z. 1987-12-20T13:59:35.50 10.0 undecidable manual SG 78 0.7548 -0.63 0.5
--.LSD.Z. 1987-12-20T13:59:34.30 10.0 undecidable manual PN 359 1.3875 -0.54 1
--.FRF.Z. 1987-12-20T13:59:31.30 10.0 undecidable manual SG 217 0.6216 -0.55 0.5
--.BNI.Z. 1987-12-20T13:59:30.50 10.0 undecidable manual PN 340 1.0545 0.4 1.4
--.RSP.Z. 1987-12-20T13:59:30.00 10.0 undecidable manual PN 3 1.0878 -0.67 0.9
--.IMP.Z. 1987-12-20T13:59:28.40 10.0 undecidable manual SG 105 0.5328 -0.67 0.4
--.CKI.Z. 1987-12-20T13:59:28.50 10.0 undecidable manual PG 65 0.8658 1.38 0.1
--.ROB.Z. 1987-12-20T13:59:28.80 10.0 undecidable manual SG 64 0.555 -0.91 0.2
--.LMR.Z. 1987-12-20T13:59:27.00 10.0 undecidable manual PG 213 0.8658 -0.03 2
--.RRL.Z. 1987-12-20T13:59:27.80 10.0 undecidable manual PG 342 0.8991 0.11 1.9
--.LRG.Z. 1987-12-20T13:59:26.80 10.0 undecidable manual PG 224 0.8325 0.26 1.8
--.SOO.Z. 1987-12-20T13:59:25.60 10.0 undecidable manual SG 353 0.444 -0.57 0.5
--.DOI.Z. 1987-12-20T13:59:25.50 10.0 undecidable manual SG 6 0.444 -0.65 0.4
--.FIN.Z. 1987-12-20T13:59:25.20 10.0 undecidable manual PG 78 0.7548 0.18 2
--.FRF.Z. 1987-12-20T13:59:22.70 10.0 undecidable manual PG 217 0.6216 0.14 2
--.ROB.Z. 1987-12-20T13:59:21.70 10.0 undecidable manual PG 64 0.555 0.38 1.7
--.IMP.Z. 1987-12-20T13:59:21.30 10.0 undecidable manual PG 105 0.5328 0.36 1.8
--.SBF.Z. 1987-12-20T13:59:20.20 10.0 undecidable manual SG 135 0.2664 -0.37 0.7
--.SOO.Z. 1987-12-20T13:59:19.70 10.0 undecidable manual PG 353 0.444 0.43 1.6
--.DOI.Z. 1987-12-20T13:59:19.70 10.0 undecidable manual PG 6 0.444 0.44 1.6
--.STV.Z. 1987-12-20T13:59:17.80 10.0 undecidable manual SG 30 0.2109 -1.2 0.1
--.SBF.Z. 1987-12-20T13:59:16.20 10.0 undecidable manual PG 135 0.2664 0.16 2
--.STV.Z. 1987-12-20T13:59:15.40 10.0 undecidable manual PG 30 0.2109 0.27 1.9
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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