Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 10-10-1991 and time 00:11:13 (Italy) in region Confine Italia Francia (FRANCIA)

A magnitude Md 2.1 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 09-10-1991 23:11:13 (UTC)
  • 10-10-1991 00:11:13 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1700, 7.0800 at 8 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
Vinadio CN 17 644 644
Sambuco CN 19 92 736
Aisone CN 20 248 984
Pietraporzio CN 20 77 1061

Municipalities with at least 50000 inhabitants

An earthquake occurred to
45 Km SW of Cuneo (56081 inhabitants)
68 Km NW 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 2.1
M 2.3 		1991-10-09
23:11:13		 44.17 7.08 8 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 150759
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-10-09 23:11:13 ± 0.609
Latitude 44.1700 ± 0.0234
Longitude 7.0800 ± 0.0316
Depth (km) 8 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 150759

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) 3626.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 228
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00170
Epicentral distance of station farthest from the epicenter (degree) 0.00996
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 150759
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:20:42

M:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 150759
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
--.PCP.Z. 1991-10-09T23:11:51.34 10.0 undecidable manual SN 70 1.11 0.48 0.5
--.CKI.Z. 1991-10-09T23:11:45.70 10.0 undecidable manual SG 73 0.888 0.71 0.5
--.FIN.Z. 1991-10-09T23:11:41.30 10.0 undecidable manual SG 87 0.8103 -0.39 0.6
--.RRL.Z. 1991-10-09T23:11:39.91 10.0 undecidable manual SG 344 0.777 -0.79 0.3
--.IMI.Z. 1991-10-09T23:11:35.18 10.0 undecidable manual SG 113 0.6327 -1.03 0.4
--.BNI.Z. 1991-10-09T23:11:35.40 10.0 undecidable manual PG 342 0.9213 3.17 0
--.PCP.Z. 1991-10-09T23:11:35.53 10.0 undecidable manual PN 70 1.11 0.53 1.2
--.ROB.Z. 1991-10-09T23:11:34.15 10.0 undecidable manual SG 76 0.5772 -0.26 0.7
--.CKI.Z. 1991-10-09T23:11:31.84 10.0 undecidable manual PG 73 0.888 0.6 1.3
--.FIN.Z. 1991-10-09T23:11:29.42 10.0 undecidable manual PG 87 0.8103 -0.28 1.5
--.RRL.Z. 1991-10-09T23:11:28.27 10.0 undecidable manual PG 344 0.777 -0.85 0.8
--.DOI.Z. 1991-10-09T23:11:27.75 10.0 undecidable manual SG 19 0.3552 0.7 0.7
--.PZZ.Z. 1991-10-09T23:11:26.70 10.0 undecidable manual SG 2 0.333 -0.38 0.6
--.IMI.Z. 1991-10-09T23:11:26.19 10.0 undecidable manual PG 113 0.6327 -0.35 1.7
--.BHB.Z. 1991-10-09T23:11:26.54 10.0 undecidable manual PG 11 0.6771 -0.69 1.1
--.ROB.Z. 1991-10-09T23:11:25.50 10.0 undecidable manual PG 76 0.5772 0 1.9
--.ENR.Z. 1991-10-09T23:11:23.65 10.0 undecidable manual SG 77 0.2442 0.33 0.7
--.STV.Z. 1991-10-09T23:11:22.40 10.0 undecidable manual SG 65 0.1887 0.7 0.5
--.DOI.Z. 1991-10-09T23:11:21.30 10.0 undecidable manual PG 19 0.3552 -0.22 1.7
--.PZZ.Z. 1991-10-09T23:11:20.42 10.0 undecidable manual PG 2 0.333 -0.48 1.5
--.ENR.Z. 1991-10-09T23:11:19.15 10.0 undecidable manual PG 77 0.2442 0.05 1.9
--.STV.Z. 1991-10-09T23:11:18.11 10.0 undecidable manual PG 65 0.1887 0.16 1.9
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download