Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of M 2.4 on date 26-03-1991 and time 01:44:52 (Italy) in region Confine Italia Francia (FRANCIA)

A magnitude M 2.4 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 26-03-1991 00:44:52 (UTC)
  • 26-03-1991 01:44:52 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9150, 7.4160 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
Olivetta San Michele IM 9 211 211
Airole IM 12 407 618
Rocchetta Nervina IM 15 298 916
Dolceacqua IM 18 2074 2990
Isolabona IM 18 679 3669

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km W of Sanremo (54807 inhabitants)
54 Km S of Cuneo (56081 inhabitants)
96 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 		M 2.4 1991-03-26
00:44:52		 43.915 7.416 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 138229
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-03-26 00:44:52 ± 0.179
Latitude 43.9150 ± 0.0142
Longitude 7.4160 ± 0.0183
Depth (km) 10 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 138229

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) 2151.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 76
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
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) 0.00040
Epicentral distance of station farthest from the epicenter (degree) 0.01603
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitude information

M:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 138229
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
--.PGF.Z. 1991-03-26T00:45:44.20 10.0 undecidable manual SN 139 1.776 -1.68 0.1
--.CDR.Z. 1991-03-26T00:45:32.90 10.0 undecidable manual SN 259 1.1988 0.66 0.5
--.LPL.Z. 1991-03-26T00:45:24.00 10.0 undecidable manual PN 343 1.665 2.08 0.1
--.LPG.Z. 1991-03-26T00:45:24.00 10.0 undecidable manual PN! 343 1.6428 2.38 0
--.LRG.Z. 1991-03-26T00:45:22.60 10.0 undecidable manual SG 239 0.888 -0.81 0.5
--.PGF.Z. 1991-03-26T00:45:22.60 10.0 undecidable manual PN 139 1.776 -0.89 0.7
--.LMR.Z. 1991-03-26T00:45:22.00 10.0 undecidable manual SG 228 0.8769 -0.96 0.4
--.CDR.Z. 1991-03-26T00:45:16.50 10.0 undecidable manual PN 259 1.1988 0.88 0.9
--.FRF.Z. 1991-03-26T00:45:15.00 10.0 undecidable manual SG 237 0.6549 -0.98 0.4
--.PCP.Z. 1991-03-26T00:45:14.10 10.0 undecidable manual PG 51 1.0101 1.04 0.8
--.FIN.Z. 1991-03-26T00:45:14.46 10.0 undecidable manual SG 62 0.6327 -0.91 0.4
--.RRL.Z. 1991-03-26T00:45:14.92 10.0 undecidable manual PN 336 1.0989 0.84 1
--.RSP.Z. 1991-03-26T00:45:14.92 10.0 undecidable manual PN 354 1.2432 -1.07 0.7
--.PZZ.Z. 1991-03-26T00:45:13.81 10.0 undecidable manual SG 339 0.6327 -1.29 0.2
--.BHB.Z. 1991-03-26T00:45:10.13 10.0 undecidable manual PG 353 0.9213 -1.02 0.9
--.ROB.Z. 1991-03-26T00:45:10.43 10.0 undecidable manual SG 40 0.4995 -0.68 0.6
--.LRG.Z. 1991-03-26T00:45:10.60 10.0 undecidable manual PG 239 0.888 0.08 1.9
--.LMR.Z. 1991-03-26T00:45:10.60 10.0 undecidable manual PG 228 0.8769 0.34 1.8
--.FRF.Z. 1991-03-26T00:45:06.20 10.0 undecidable manual PG 237 0.6549 -0.03 2
--.FIN.Z. 1991-03-26T00:45:06.22 10.0 undecidable manual PG 62 0.6327 0.34 1.8
--.PZZ.Z. 1991-03-26T00:45:05.81 10.0 undecidable manual PG 339 0.6327 0.09 2
--.IMI.Z. 1991-03-26T00:45:05.69 10.0 undecidable manual SG 90 0.3441 -0.15 0.8
--.STV.Z. 1991-03-26T00:45:04.37 10.0 undecidable manual SG 349 0.3441 -1.42 0.2
--.ROB.Z. 1991-03-26T00:45:03.35 10.0 undecidable manual PG 40 0.4995 -0.07 2
--.IMI.Z. 1991-03-26T00:45:00.96 10.0 undecidable manual PG 90 0.3441 0.58 1.6
--.STV.Z. 1991-03-26T00:44:59.97 10.0 undecidable manual PG 349 0.3441 -0.38 1.8
--.ENR.Z. 1991-03-26T00:44:59.69 10.0 undecidable manual PG 0 0.3108 -0.09 2
--.SBF.Z. 1991-03-26T00:44:55.00 10.0 undecidable manual PG 165 0.0444 -0.24 1.9
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