Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 26-07-1987 and time 00:33:38 (Italy) in region Confine Italia Francia (FRANCIA)

A magnitude Md 2.5 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 25-07-1987 22:33:38 (UTC)
  • 26-07-1987 00:33:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3160, 6.7760 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
Argentera CN 17 83 83

Municipalities with at least 50000 inhabitants

An earthquake occurred to
62 Km W of Cuneo (56081 inhabitants)
98 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 2.5 1987-07-25
22:33:38		 44.316 6.776 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 52769
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-07-25 22:33:38 ± 0.136
Latitude 44.3160 ± 0.0068
Longitude 6.7760 ± 0.0144
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 52769

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) 1374.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 155
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) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00267
Epicentral distance of station farthest from the epicenter (degree) 0.01077
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 52769
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:50:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.LPL.Z. 1987-07-25T22:34:18.60 10.0 undecidable manual SN 358 1.1988 0.84 0.1
--.LPG.Z. 1987-07-25T22:34:17.20 10.0 undecidable manual SN 359 1.1766 -0.11 0.7
--.FIN.Z. 1987-07-25T22:34:12.80 10.0 undecidable manual SN 95 1.0212 -0.95 0.1
--.LMR.Z. 1987-07-25T22:34:12.00 10.0 undecidable manual SG 191 0.999 -0.76 0.2
--.IMI.Z. 1987-07-25T22:34:10.30 10.0 undecidable manual SG 116 0.888 0.78 0.2
--.LRG.Z. 1987-07-25T22:34:09.80 10.0 undecidable manual SG 199 0.9102 -0.11 0.8
--.RSP.Z. 1987-07-25T22:34:08.70 10.0 undecidable manual SG 22 0.8991 -0.93 0.1
--.FRF.Z. 1987-07-25T22:34:04.50 10.0 undecidable manual SG 187 0.7548 -0.59 0.4
--.ROB.Z. 1987-07-25T22:34:04.90 10.0 undecidable manual SG 90 0.777 -0.94 0.1
--.BNI.Z. 1987-07-25T22:34:03.76 10.0 undecidable manual SG 354 0.7326 -0.64 0.3
--.LPL.Z. 1987-07-25T22:34:01.80 10.0 undecidable manual PN 358 1.1988 0.52 1
--.LPG.Z. 1987-07-25T22:34:01.60 10.0 undecidable manual PN 359 1.1766 0.59 0.8
--.RRL.Z. 1987-07-25T22:33:59.30 10.0 undecidable manual SG 0 0.5994 -0.75 0.2
--.LMR.Z. 1987-07-25T22:33:58.60 10.0 undecidable manual PG 191 0.999 0.21 1.7
--.FIN.Z. 1987-07-25T22:33:58.90 10.0 undecidable manual PN 95 1.0212 -0.05 1.9
--.RSP.Z. 1987-07-25T22:33:56.60 10.0 undecidable manual PG 22 0.8991 0.02 2
--.IMI.Z. 1987-07-25T22:33:56.40 10.0 undecidable manual PG 116 0.888 -0.12 2
--.LRG.Z. 1987-07-25T22:33:56.60 10.0 undecidable manual PG 199 0.9102 -0.14 1.9
--.FRF.Z. 1987-07-25T22:33:54.00 10.0 undecidable manual PG 187 0.7548 0.05 2.1
--.ROB.Z. 1987-07-25T22:33:54.70 10.0 undecidable manual PG 90 0.777 0.31 1.7
--.BNI.Z. 1987-07-25T22:33:53.62 10.0 undecidable manual PG 354 0.7326 0.05 2.1
--.SBF.Z. 1987-07-25T22:33:52.60 10.0 undecidable manual PG 133 0.6438 0.6 0.9
--.STV.Z. 1987-07-25T22:33:52.90 10.0 undecidable manual SG 99 0.3996 -0.66 0.3
--.PZZ.Z. 1987-07-25T22:33:50.50 10.0 undecidable manual SG 50 0.2997 0.23 0.8
--.RRL.Z. 1987-07-25T22:33:50.50 10.0 undecidable manual PG 0 0.5994 -0.55 1.1
--.STV.Z. 1987-07-25T22:33:47.30 10.0 undecidable manual PG 99 0.3996 -0.01 2.1
--.PZZ.Z. 1987-07-25T22:33:45.90 10.0 undecidable manual PG 50 0.2997 0.49 1.2
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