Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.3 on date 05-02-1991 and time 10:06:09 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude Md 2.3 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 05-02-1991 09:06:09 (UTC)
  • 05-02-1991 10:06:09 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.7580, 7.7690 at 18 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
Ospedaletti IM 6 3367 3367
Sanremo IM 7 54807 58174
Bordighera IM 8 10469 68643
Seborga IM 10 315 68958
Vallebona IM 10 1310 70268
Vallecrosia IM 11 6956 77224
San Biagio della Cima IM 12 1329 78553
Taggia IM 12 14116 92669
Soldano IM 12 977 93646
Riva Ligure IM 13 2910 96556
Camporosso IM 13 5632 102188
Ventimiglia IM 13 24310 126498
Santo Stefano al Mare IM 14 2197 128695
Ceriana IM 14 1250 129945
Perinaldo IM 14 870 130815
Pompeiana IM 14 823 131638
Castellaro IM 14 1256 132894
Terzorio IM 15 216 133110
Dolceacqua IM 15 2074 135184
Apricale IM 16 629 135813
Bajardo IM 17 312 136125
Cipressa IM 17 1290 137415
Isolabona IM 17 679 138094
Costarainera IM 18 828 138922
Pietrabruna IM 18 501 139423
Badalucco IM 19 1136 140559
San Lorenzo al Mare IM 19 1297 141856
Montalto Ligure IM 20 377 142233

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km S of Sanremo (54807 inhabitants)
73 Km S of Cuneo (56081 inhabitants)
84 Km SW 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 2.3
M 2.7 		1991-02-05
09:06:09		 43.758 7.769 18 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 135429
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-02-05 09:06:09 ± 0.361
Latitude 43.7580 ± 0.0229
Longitude 7.7690 ± 0.0282
Depth (km) 18 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 135429

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) 3406.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 107
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00154
Epicentral distance of station farthest from the epicenter (degree) 0.01708
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 135429
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:06:15

M:2.7

Field Value
Value 2.7
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 135429
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
--.RRL.Z. 1991-02-05T09:06:51.32 10.0 undecidable manual SN 329 1.3431 1.03 0.4
--.PGF.Z. 1991-02-05T09:06:51.80 10.0 undecidable manual SN 143 1.4985 -2.01 0.1
--.RSP.Z. 1991-02-05T09:06:50.24 10.0 undecidable manual SN 345 1.443 -1.99 0.1
--.LPL.Z. 1991-02-05T09:06:43.60 10.0 undecidable manual PN! 337 1.8981 3.23 0
--.LRG.Z. 1991-02-05T09:06:42.20 10.0 undecidable manual SN 253 1.0656 -1.09 0.4
--.LMR.Z. 1991-02-05T09:06:40.70 10.0 undecidable manual SN 245 0.999 -1.23 0.4
--.PCP.Z. 1991-02-05T09:06:39.16 10.0 undecidable manual SN 35 0.9546 -1.67 0.2
--.DOI.Z. 1991-02-05T09:06:37.75 10.0 undecidable manual SN 333 0.8214 -0.08 0.8
--.PZZ.Z. 1991-02-05T09:06:36.90 10.0 undecidable manual SN! 327 0.8769 -2.99 0
--.FRF.Z. 1991-02-05T09:06:36.59 10.0 undecidable manual SN 256 0.8214 -1.27 0.4
--.CDR.Z. 1991-02-05T09:06:35.60 10.0 undecidable manual PN 267 1.443 1.5 0.5
--.CKI.Z. 1991-02-05T09:06:35.68 10.0 undecidable manual SG 28 0.7548 0.32 0.8
--.RRL.Z. 1991-02-05T09:06:35.00 10.0 undecidable manual PN! 329 1.3431 2.14 0
--.PGF.Z. 1991-02-05T09:06:34.20 10.0 undecidable manual PN 143 1.4985 -0.69 1.2
--.RSP.Z. 1991-02-05T09:06:34.24 10.0 undecidable manual PN 345 1.443 0.26 1.6
--.LRG.Z. 1991-02-05T09:06:29.30 10.0 undecidable manual PN 253 1.0656 0.48 1.7
--.BHB.Z. 1991-02-05T09:06:29.31 10.0 undecidable manual PN 341 1.1322 -0.48 1.7
--.STV.Z. 1991-02-05T09:06:28.70 10.0 undecidable manual SG 327 0.5883 -1.82 0.2
--.FIN.Z. 1991-02-05T09:06:27.56 10.0 undecidable manual SG 35 0.5439 -1.24 0.4
--.PCP.Z. 1991-02-05T09:06:27.97 10.0 undecidable manual PN 35 0.9546 0.57 1.7
--.DOI.Z. 1991-02-05T09:06:27.37 10.0 negative manual PN 333 0.8214 1.71 1
--.LMR.Z. 1991-02-05T09:06:27.90 10.0 undecidable manual PN 245 0.999 -0.13 2
--.CKI.Z. 1991-02-05T09:06:26.10 10.0 undecidable manual PG 28 0.7548 1.78 0.4
--.PZZ.Z. 1991-02-05T09:06:26.23 10.0 undecidable manual PN 327 0.8769 -0.16 2.1
--.ENR.Z. 1991-02-05T09:06:26.54 10.0 undecidable manual SG 332 0.5328 -1.64 0.2
--.ROB.Z. 1991-02-05T09:06:26.85 10.0 undecidable manual SG 7 0.5439 -1.88 0.2
--.FRF.Z. 1991-02-05T09:06:25.60 10.0 undecidable manual PN 256 0.8214 -0.08 2.1
--.ROB.Z. 1991-02-05T09:06:20.23 10.0 undecidable manual PG 7 0.5439 -0.18 2.1
--.FIN.Z. 1991-02-05T09:06:20.37 10.0 undecidable manual PG 35 0.5439 -0.07 2.1
--.STV.Z. 1991-02-05T09:06:20.90 10.0 undecidable manual PG 327 0.5883 -0.18 2.1
--.ENR.Z. 1991-02-05T09:06:20.80 10.0 undecidable manual PG 332 0.5328 -0.02 2.1
--.SBF.Z. 1991-02-05T09:06:18.59 10.0 undecidable manual SG 293 0.2553 -1.31 0.4
--.IMI.Z. 1991-02-05T09:06:17.10 10.0 undecidable manual SG 30 0.1665 -0.41 0.8
--.SBF.Z. 1991-02-05T09:06:15.80 10.0 undecidable manual PG 293 0.2553 0.49 1.9
--.IMI.Z. 1991-02-05T09:06:14.30 10.0 undecidable manual PG 30 0.1665 0.1 2.1
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download