Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 06-09-1991 and time 05:23:07 (Italy) in region Confine Italia Francia (FRANCIA)

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

  • 06-09-1991 03:23:07 (UTC)
  • 06-09-1991 05:23:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.6170, 6.8560 at 9 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
La Thuile AO 13 761 761
Valgrisenche AO 16 196 957
Pré-Saint-Didier AO 19 1050 2007

Municipalities with at least 50000 inhabitants

An earthquake occurred to
88 Km NW of Torino (890529 inhabitants)
94 Km NW of Moncalieri (57294 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 2.4 		1991-09-06
03:23:07		 45.617 6.856 9 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 148819
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-09-06 03:23:07 ± 0.249
Latitude 45.6170 ± 0.0119
Longitude 6.8560 ± 0.0215
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 148819

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) 2131.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 69
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
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) 0.00113
Epicentral distance of station farthest from the epicenter (degree) 0.02639
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:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 148819
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:18:54

M:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 148819
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. 1991-09-06T03:23:55.00 10.0 undecidable manual PN 289 2.9304 1.12 0.3
--.AVF.Z. 1991-09-06T03:23:51.00 10.0 undecidable manual PN 296 2.6862 0.44 0.8
--.LOR.Z. 1991-09-06T03:23:50.00 10.0 undecidable manual PN 309 2.6307 0.12 1
--.LBF.Z. 1991-09-06T03:23:47.20 10.0 undecidable manual PN 305 2.4087 0.48 0.9
--.HAU.Z. 1991-09-06T03:23:46.80 10.0 undecidable manual PN 351 2.4087 0.07 1.1
--.BSF.Z. 1991-09-06T03:23:45.60 10.0 undecidable manual PN 358 2.2089 1.59 0.1
--.PZZ.Z. 1991-09-06T03:23:44.20 10.0 undecidable manual SN 170 1.1211 -0.85 0.4
--.ORX.Z. 1991-09-06T03:23:33.34 10.0 undecidable manual SG 88 0.777 -1.42 0.1
--.RRL.Z. 1991-09-06T03:23:31.10 10.0 undecidable manual SG 184 0.6882 -0.8 0.4
--.PZZ.Z. 1991-09-06T03:23:29.24 10.0 undecidable manual PN 170 1.1211 0.2 1.7
--.RSP.Z. 1991-09-06T03:23:27.90 10.0 undecidable manual SG 148 0.5439 0.15 0.7
--.BNI.Z. 1991-09-06T03:23:26.36 10.0 undecidable manual SG 192 0.5772 -1.68 0.1
--.MMK.Z. 1991-09-06T03:23:25.00 10.0 undecidable manual PG 60 0.8769 -0.04 1.8
--.BHB.Z. 1991-09-06T03:23:24.64 10.0 undecidable manual PG 159 0.8214 0.59 1.4
--.ORX.Z. 1991-09-06T03:23:23.19 10.0 undecidable manual PG 88 0.777 -0.01 1.8
--.RRL.Z. 1991-09-06T03:23:21.65 10.0 undecidable manual PG 184 0.6882 0.1 1.8
--.RSP.Z. 1991-09-06T03:23:19.40 10.0 undecidable manual PG 148 0.5439 0.71 1.2
--.DIX.Z. 1991-09-06T03:23:19.10 10.0 undecidable manual PG 39 0.5994 -0.7 1.2
--.BNI.Z. 1991-09-06T03:23:19.33 10.0 undecidable manual PG 192 0.5772 0 1.8
--.LSD.Z. 1991-09-06T03:23:17.95 10.0 undecidable manual SG 126 0.2553 0 0.7
--.EMS.Z. 1991-09-06T03:23:15.70 10.0 undecidable manual PG 6 0.444 -1.37 0.4
--.LPL.Z. 1991-09-06T03:23:13.30 10.0 undecidable manual SG 220 0.1221 -0.11 0.7
--.LSD.Z. 1991-09-06T03:23:13.86 10.0 undecidable manual PG 126 0.2553 0.37 1.6
--.LPL.Z. 1991-09-06T03:23:11.00 10.0 undecidable manual PG 220 0.1221 0.12 1.8
--.LPG.Z. 1991-09-06T03:23:11.20 10.0 undecidable manual PG 211 0.1332 0.18 1.8
--.RSL.Z. 1991-09-06T03:23:11.84 10.0 undecidable manual SG! 293 0.1665 -3.06 0
--.RSL.Z. 1991-09-06T03:23:10.20 10.0 undecidable manual PG 293 0.1665 -1.54 0.2
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