Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 03-10-1991 and time 19:15:47 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude Md 2.5 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 03-10-1991 18:15:47 (UTC)
  • 03-10-1991 19:15:47 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9240, 7.4740 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Olivetta San Michele IM 6 211 211
Airole IM 9 407 618
Rocchetta Nervina IM 11 298 916
Isolabona IM 14 679 1595
Dolceacqua IM 15 2074 3669
Pigna IM 15 859 4528
Apricale IM 16 629 5157
Castel Vittorio IM 16 287 5444
Perinaldo IM 17 870 6314
Camporosso IM 17 5632 11946
Soldano IM 18 977 12923
San Biagio della Cima IM 18 1329 14252
Ventimiglia IM 18 24310 38562
Bajardo IM 20 312 38874
Vallebona IM 20 1310 40184
Vallecrosia IM 20 6956 47140

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km W of Sanremo (54807 inhabitants)
53 Km S of Cuneo (56081 inhabitants)
91 Km W of Savona (61345 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
M 2.9 		1991-10-03
18:15:47		 43.924 7.474 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 150399
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-10-03 18:15:47 ± 0.145
Latitude 43.9240 ± 0.0104
Longitude 7.4740 ± 0.0133
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 150399

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) 1575.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 37
Number of defining phases 37
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) 0.00057
Epicentral distance of station farthest from the epicenter (degree) 0.01587
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 150399
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:20:22

M:2.9

Field Value
Value 2.9
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 150399
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:48:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.LPG.Z. 1991-10-03T18:16:44.00 10.0 undecidable manual SN! 342 1.6428 6.48 0
--.PGF.Z. 1991-10-03T18:16:38.00 10.0 undecidable manual SN 140 1.7649 -2.2 0
--.RRL.Z. 1991-10-03T18:16:24.90 10.0 undecidable manual SN 333 1.11 -0.5 0.4
--.RSP.Z. 1991-10-03T18:16:24.40 10.0 undecidable manual SN! 352 1.2321 -3.19 0
--.PCP.Z. 1991-10-03T18:16:21.43 10.0 undecidable manual SG 50 0.9768 0.23 0.6
--.LRG.Z. 1991-10-03T18:16:19.30 10.0 undecidable manual SG 240 0.9213 -0.22 0.7
--.LPL.Z. 1991-10-03T18:16:18.40 10.0 undecidable manual PN 341 1.6761 1.63 0.1
--.LMR.Z. 1991-10-03T18:16:18.20 10.0 undecidable manual SG 230 0.9102 -0.73 0.4
--.LPG.Z. 1991-10-03T18:16:18.20 10.0 undecidable manual PN 342 1.6428 1.74 0.1
--.PGF.Z. 1991-10-03T18:16:17.20 10.0 undecidable manual PN 140 1.7649 -0.81 0.8
--.BNI.Z. 1991-10-03T18:16:12.00 10.0 undecidable manual PN 333 1.2543 0.92 0.7
--.FRF.Z. 1991-10-03T18:16:11.20 10.0 undecidable manual SG 238 0.6882 -0.84 0.4
--.CKI.Z. 1991-10-03T18:16:10.00 10.0 undecidable manual SG! 49 0.7548 -4.04 0
--.PZZ.Z. 1991-10-03T18:16:09.74 10.0 undecidable manual SG 335 0.6327 -0.39 0.5
--.RRL.Z. 1991-10-03T18:16:09.12 10.0 undecidable manual PN 333 1.11 0.12 1.6
--.RSP.Z. 1991-10-03T18:16:09.43 10.0 undecidable manual PN 352 1.2321 -1.3 0.3
--.FIN.Z. 1991-10-03T18:16:08.51 10.0 undecidable manual SG 61 0.5883 -0.35 0.7
--.DOI.Z. 1991-10-03T18:16:08.00 10.0 undecidable manual SG 344 0.5883 -0.95 0.2
--.LRG.Z. 1991-10-03T18:16:06.40 10.0 undecidable manual PG 240 0.9213 0.33 1.6
--.PCP.Z. 1991-10-03T18:16:06.97 10.0 undecidable manual PG 50 0.9768 -0.07 1.7
--.LMR.Z. 1991-10-03T18:16:05.90 10.0 undecidable manual PG 230 0.9102 0.16 1.7
--.BHB.Z. 1991-10-03T18:16:04.70 10.0 undecidable manual PG 350 0.9213 -1.19 0.4
--.ROB.Z. 1991-10-03T18:16:04.51 10.0 undecidable manual SG 36 0.4662 -0.35 0.6
--.CKI.Z. 1991-10-03T18:16:03.00 10.0 undecidable manual PG 49 0.7548 0.09 1.8
--.FRF.Z. 1991-10-03T18:16:02.00 10.0 undecidable manual PG 238 0.6882 0.24 1.8
--.STV.Z. 1991-10-03T18:16:00.10 10.0 undecidable manual SG 342 0.3441 -0.54 0.4
--.DOI.Z. 1991-10-03T18:16:00.00 10.0 undecidable manual PG 344 0.5883 0.03 1.8
--.PZZ.Z. 1991-10-03T18:16:00.82 10.0 undecidable manual PG 335 0.6327 0.16 1.9
--.FIN.Z. 1991-10-03T18:16:00.00 10.0 undecidable manual PG 61 0.5883 0.08 1.8
--.IMI.Z. 1991-10-03T18:15:59.28 10.0 undecidable manual SG 92 0.2997 -0.04 0.7
--.ENR.Z. 1991-10-03T18:15:59.70 10.0 undecidable manual SG 352 0.2997 -0.34 0.6
--.ROB.Z. 1991-10-03T18:15:57.84 10.0 undecidable manual PG 36 0.4662 0.23 1.8
--.STV.Z. 1991-10-03T18:15:55.70 10.0 undecidable manual PG 342 0.3441 -0.1 1.8
--.ENR.Z. 1991-10-03T18:15:54.66 10.0 undecidable manual PG 352 0.2997 0.19 1.8
--.IMI.Z. 1991-10-03T18:15:54.56 10.0 undecidable manual PG 92 0.2997 0.15 1.7
--.SBF.Z. 1991-10-03T18:15:51.60 10.0 undecidable manual SG 204 0.0666 -0.42 0.6
--.SBF.Z. 1991-10-03T18:15:50.30 10.0 undecidable manual PG 204 0.0666 0.1 1.8
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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