Earthquake with magnitude of Md 2.5 on date 13-04-1985 and time 23:42:15 (Italy) in region Confine Italia Francia (FRANCIA)

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

  • 13-04-1985 21:42:15 (UTC)
  • 13-04-1985 23:42:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.09, 7.63 at 7 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Briga Alta CN 9 39 39
Limone Piemonte CN 13 1485 1524
Mendatica IM 14 185 1709
Triora IM 15 355 2064
Montegrosso Pian Latte IM 15 118 2182
Molini di Triora IM 16 617 2799
Cosio d'Arroscia IM 16 221 3020
Pigna IM 18 859 3879
Castel Vittorio IM 18 287 4166
Vernante CN 19 1178 5344
Pornassio IM 19 685 6029

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NW of Sanremo (54807 inhabitants)
35 Km S of Cuneo (56081 inhabitants)
72 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
Rev 1000 Md 2.5 1985-04-13
21:42:15
44.09 7.63 7 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 4609
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-13 21:42:15 ± 0.132
Latitude 44.09 ± 0.01
Longitude 7.63 ± 0.01
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 4609

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) 1265.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.00227
Epicentral distance of station farthest from the epicenter (degree) 0.01052
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 4609
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:09:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.BN9.Z. 1985-04-13T21:42:54.50 10.0 undecidable manual SN 325 0.0105 -0.38 0.4
--.LRG.Z. 1985-04-13T21:42:53.60 10.0 undecidable manual SN 235 0.01 0.16 0.6
--.LMR.Z. 1985-04-13T21:42:52.80 10.0 undecidable manual SN 227 0.01 -0.47 0.3
--.FRF.Z. 1985-04-13T21:42:45.50 10.0 undecidable manual SG 233 0.0079 -1.02 0
--.LRG.Z. 1985-04-13T21:42:38.00 10.0 undecidable manual PN 235 0.01 0.59 0.6
--.BN9.Z. 1985-04-13T21:42:38.50 10.0 undecidable manual PN 325 0.0105 0.25 1.3
--.LMR.Z. 1985-04-13T21:42:37.80 10.0 undecidable manual PN 227 0.01 0.48 0.8
--.FRF.Z. 1985-04-13T21:42:33.60 10.0 undecidable manual PG 233 0.0079 0.18 1.6
--.FIN.Z. 1985-04-13T21:42:31.00 10.0 undecidable manual SG 74 0.0038 -0.82 0.1
--.ROB.Z. 1985-04-13T21:42:26.50 10.0 undecidable manual SG 39 0.0024 0.23 0.7
--.IMP.Z. 1985-04-13T21:42:25.50 10.0 undecidable manual SG 132 0.0023 -0.1 0.8
--.STV.Z. 1985-04-13T21:42:25.60 10.0 undecidable manual SG 306 0.0024 -0.6 0.4
--.FIN.Z. 1985-04-13T21:42:24.60 10.0 undecidable manual PG 74 0.0038 -0.33 1.5
--.ROB.Z. 1985-04-13T21:42:22.20 10.0 undecidable manual PG 39 0.0024 0.48 1.1
--.STV.Z. 1985-04-13T21:42:21.60 10.0 positive manual PG 306 0.0024 -0.09 4
--.IMP.Z. 1985-04-13T21:42:21.10 10.0 undecidable manual PG 132 0.0023 -0.24 1.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download