Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 22-08-1991 and time 17:03:33 (Italy) in region 1 km N Vernante (CN)

A magnitude Md 2.1 earthquake occured in region: 1 km N Vernante (CN), on

  • 22-08-1991 15:03:33 (UTC)
  • 22-08-1991 17:03:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2580, 7.5320 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
Vernante CN 1 1178 1178
Robilante CN 4 2306 3484
Roaschia CN 6 107 3591
Limone Piemonte CN 7 1485 5076
Roccavione CN 8 2761 7837
Boves CN 8 9835 17672
Borgo San Dalmazzo CN 9 12468 30140
Peveragno CN 11 5543 35683
Entracque CN 11 774 36457
Valdieri CN 11 935 37392
Roccasparvera CN 12 741 38133
Vignolo CN 12 2600 40733
Gaiola CN 13 582 41315
Moiola CN 13 234 41549
Chiusa di Pesio CN 14 3676 45225
Rittana CN 15 109 45334
Cervasca CN 15 5013 50347
Beinette CN 15 3423 53770
Cuneo CN 15 56081 109851
Valloriate CN 15 109 109960
Bernezzo CN 17 4104 114064
Roccaforte Mondovì CN 18 2085 116149
Pianfei CN 19 2202 118351
Demonte CN 20 2003 120354
Caraglio CN 20 6836 127190

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km S of Cuneo (56081 inhabitants)
53 Km NW of Sanremo (54807 inhabitants)
76 Km W of Savona (61345 inhabitants)
84 Km S of Moncalieri (57294 inhabitants)
89 Km SW of Asti (76202 inhabitants)
92 Km S of Torino (890529 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 2.1
M 2.5 		1991-08-22
15:03:33		 44.258 7.532 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 147999
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-08-22 15:03:33 ± 0.253
Latitude 44.2580 ± 0.0154
Longitude 7.5320 ± 0.0237
Depth (km) 10 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 147999

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) 2548.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00283
Epicentral distance of station farthest from the epicenter (degree) 0.01805
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 147999
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:18:07

M:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 147999
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:42:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.PGF.Z. 1991-08-22T15:04:29.80 10.0 undecidable manual SN! 147 2.0091 -2.07 0
--.LRG.Z. 1991-08-22T15:04:12.00 10.0 undecidable manual SN 226 1.1544 0.31 0.6
--.LMR.Z. 1991-08-22T15:04:11.60 10.0 undecidable manual SN 218 1.1766 -0.49 0.6
--.PGF.Z. 1991-08-22T15:04:06.20 10.0 undecidable manual PN 147 2.0091 -1.01 0.5
--.FRF.Z. 1991-08-22T15:04:04.00 10.0 undecidable manual SG 222 0.9324 -1.72 0.1
--.LPG.Z. 1991-08-22T15:03:59.59 10.0 undecidable manual PN 336 1.3431 1.4 0.3
--.LMR.Z. 1991-08-22T15:03:56.20 10.0 undecidable manual PN 218 1.1766 0.41 1.5
--.LRG.Z. 1991-08-22T15:03:56.41 10.0 undecidable manual PN 226 1.1544 0.86 0.9
--.FRF.Z. 1991-08-22T15:03:52.59 10.0 undecidable manual PG 222 0.9324 0.48 1.5
--.CKI.Z. 1991-08-22T15:03:52.97 10.0 undecidable manual SG 72 0.555 -0.37 0.7
--.SBF.Z. 1991-08-22T15:03:48.00 10.0 undecidable manual SG 189 0.3996 -0.29 0.7
--.CKI.Z. 1991-08-22T15:03:44.92 10.0 undecidable manual PG 72 0.555 -0.04 1.9
--.DOI.Z. 1991-08-22T15:03:44.93 10.0 undecidable manual SG 320 0.3108 -0.75 0.5
--.SBF.Z. 1991-08-22T15:03:41.80 10.0 undecidable manual PG 189 0.3996 -0.25 1.8
--.DOI.Z. 1991-08-22T15:03:39.84 10.0 negative manual PG 320 0.3108 -0.7 2.5
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