Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.3 on date 26-09-1991 and time 05:58:01 (Italy) in region 1 km NW Monterosso Grana (CN)

A magnitude Md 2.3 earthquake occured in region: 1 km NW Monterosso Grana (CN), on

  • 26-09-1991 03:58:01 (UTC)
  • 26-09-1991 05:58:01 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.4190, 7.3130 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Monterosso Grana CN 1 505 505
Pradleves CN 2 250 755
Montemale di Cuneo CN 5 241 996
Valgrana CN 6 786 1782
Cartignano CN 7 190 1972
Dronero CN 7 7035 9007
Roccabruna CN 7 1585 10592
Castelmagno CN 8 66 10658
Villar San Costanzo CN 9 1547 12205
San Damiano Macra CN 9 430 12635
Caraglio CN 9 6836 19471
Valloriate CN 10 109 19580
Rittana CN 10 109 19689
Bernezzo CN 10 4104 23793
Demonte CN 12 2003 25796
Gaiola CN 12 582 26378
Moiola CN 13 234 26612
Celle di Macra CN 13 100 26712
Cervasca CN 13 5013 31725
Roccasparvera CN 13 741 32466
Aisone CN 14 248 32714
Macra CN 14 59 32773
Vignolo CN 14 2600 35373
Valmala CN 14 52 35425
Melle CN 16 292 35717
Vinadio CN 17 644 36361
Busca CN 17 10181 46542
Rossana CN 17 908 47450
Valdieri CN 17 935 48385
Borgo San Dalmazzo CN 17 12468 60853
Frassino CN 17 265 61118
Venasca CN 17 1437 62555
Brossasco CN 17 1084 63639
Roccavione CN 18 2761 66400
Stroppo CN 18 103 66503
Marmora CN 18 68 66571
Canosio CN 19 80 66651
Cuneo CN 19 56081 122732
Isasca CN 20 76 122808
Roaschia CN 20 107 122915

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km W of Cuneo (56081 inhabitants)
71 Km SW of Moncalieri (57294 inhabitants)
76 Km NW of Sanremo (54807 inhabitants)
79 Km SW of Torino (890529 inhabitants)
89 Km SW of Asti (76202 inhabitants)
94 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 2.3
M 2.5 		1991-09-26
03:58:01		 44.419 7.313 12 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 149919
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-09-26 03:58:01 ± 0.117
Latitude 44.4190 ± 0.0085
Longitude 7.3130 ± 0.0142
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 149919

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) 1476.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 36
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) 0.00081
Epicentral distance of station farthest from the epicenter (degree) 0.03408
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 21
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 149919
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:19:56

M:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 149919
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
--.BGF.Z. 1991-09-26T03:59:00.80 10.0 undecidable manual PN 305 3.7851 1.63 0
--.LRG.Z. 1991-09-26T03:58:39.00 10.0 undecidable manual SN 215 1.1766 -0.56 0.3
--.LMR.Z. 1991-09-26T03:58:39.60 10.0 undecidable manual SN 208 1.221 -1.07 0.1
--.PGF.Z. 1991-09-26T03:58:38.00 10.0 undecidable manual PN 146 2.2311 0.17 1.1
--.LPG.Z. 1991-09-26T03:58:38.00 10.0 undecidable manual SN 339 1.1433 -0.74 0.1
--.FRF.Z. 1991-09-26T03:58:32.60 10.0 undecidable manual SG! 209 0.9768 -2.16 0
--.PCP.Z. 1991-09-26T03:58:30.85 10.0 undecidable manual SG 81 0.8769 -0.84 0.3
--.CDR.Z. 1991-09-26T03:58:26.10 10.0 undecidable manual PN 236 1.332 0.6 1.1
--.BNI.Z. 1991-09-26T03:58:25.65 10.0 undecidable manual SG! 324 0.777 -2.51 0
--.RSP.Z. 1991-09-26T03:58:25.85 10.0 undecidable manual SG 356 0.7326 -0.92 0.2
--.LMR.Z. 1991-09-26T03:58:24.20 10.0 undecidable manual PN 208 1.221 0.17 1.6
--.CKI.Z. 1991-09-26T03:58:24.50 10.0 undecidable manual SG 89 0.6882 -0.86 0.3
--.IMI.Z. 1991-09-26T03:58:23.80 10.0 undecidable manual SG 140 0.6549 -1.24 0.1
--.LRG.Z. 1991-09-26T03:58:23.39 10.0 undecidable manual PN 215 1.1766 0 1.6
--.LPL.Z. 1991-09-26T03:58:23.39 10.0 undecidable manual PN 339 1.1655 0.16 1.6
--.RRL.Z. 1991-09-26T03:58:22.36 10.0 undecidable manual SG 323 0.6216 -0.98 0.2
--.LPG.Z. 1991-09-26T03:58:22.89 10.0 undecidable manual PN 339 1.1433 -0.03 1.6
--.SBF.Z. 1991-09-26T03:58:20.00 10.0 undecidable manual SG 170 0.555 -1.28 0.1
--.FRF.Z. 1991-09-26T03:58:19.80 10.0 undecidable manual PG 209 0.9768 -0.82 0.8
--.PCP.Z. 1991-09-26T03:58:18.84 10.0 undecidable manual PG 81 0.8769 -0.01 1.9
--.BNI.Z. 1991-09-26T03:58:17.37 10.0 undecidable manual PG 324 0.777 0.56 1.4
--.ROB.Z. 1991-09-26T03:58:16.62 10.0 undecidable manual SG 106 0.4107 -0.02 0.8
--.CKI.Z. 1991-09-26T03:58:15.85 10.0 undecidable manual PG 89 0.6882 0.66 1.1
--.RSP.Z. 1991-09-26T03:58:15.53 10.0 undecidable manual PG 356 0.7326 -0.48 1.3
--.IMI.Z. 1991-09-26T03:58:14.16 10.0 undecidable manual PG 140 0.6549 -0.43 1.6
--.SBF.Z. 1991-09-26T03:58:13.00 10.0 undecidable manual PG 170 0.555 0.16 1.9
--.RRL.Z. 1991-09-26T03:58:13.72 10.0 undecidable manual PG 323 0.6216 -0.31 1.6
--.ROB.Z. 1991-09-26T03:58:10.60 10.0 undecidable manual PG 106 0.4107 0.44 1.5
--.BHB.Z. 1991-09-26T03:58:09.53 10.0 undecidable manual PG 355 0.4107 -0.61 1
--.STV.Z. 1991-09-26T03:58:08.31 10.0 undecidable manual SG 175 0.1665 -0.41 0.7
--.PZZ.Z. 1991-09-26T03:58:08.20 10.0 undecidable manual SG 299 0.1665 -0.86 0.3
--.DOI.Z. 1991-09-26T03:58:07.14 10.0 undecidable manual SG 330 0.0888 0.44 0.6
--.ENR.Z. 1991-09-26T03:58:06.34 10.0 undecidable manual PG 158 0.2109 0.05 1.9
--.PZZ.Z. 1991-09-26T03:58:05.65 10.0 undecidable manual PG 299 0.1665 -0.03 2
--.STV.Z. 1991-09-26T03:58:05.78 10.0 undecidable manual PG 175 0.1665 0.19 1.8
--.DOI.Z. 1991-09-26T03:58:04.89 10.0 undecidable manual PG 330 0.0888 0.47 1.4
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download