Earthquake with magnitude of Md 2.5 on date 24-04-1987 and time 18:21:10 (Italy) in region Costa Francese (FRANCIA)

A magnitude Md 2.5 earthquake occured in region: Costa Francese (FRANCIA), on

  • 24-04-1987 16:21:10 (UTC)
  • 24-04-1987 18:21:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.06, 5.75 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.

Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 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 1987-04-24
16:21:10
43.06 5.75 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 45569
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-24 16:21:10 ± 1.23
Latitude 43.06 ± 0.08
Longitude 5.75 ± 0.12
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 45569

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) 13283.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 320
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.8
Epicentral distance of station closest to the epicenter (degree) 0.01481
Epicentral distance of station farthest from the epicenter (degree) 0.01894
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 45569
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:44:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.FIN.Z. 1987-04-24T16:22:12.20 10.0 undecidable manual SN 57 0.0189 0.98 0.5
--.RRL.Z. 1987-04-24T16:22:10.00 10.0 undecidable manual SN 22 0.018 1.5 0.2
--.ROB.Z. 1987-04-24T16:22:05.90 10.0 undecidable manual SN 51 0.0177 -1.92 0.1
--.DA9.Z. 1987-04-24T16:22:04.00 10.0 undecidable manual SN 37 0.0161 0.27 0.8
--.SOO.Z. 1987-04-24T16:22:01.70 10.0 undecidable manual SN 34 0.0156 -0.63 0.7
--.FIN.Z. 1987-04-24T16:21:47.10 10.0 undecidable manual PN 57 0.0189 1.55 0.6
--.RRL.Z. 1987-04-24T16:21:43.50 10.0 undecidable manual PN 22 0.018 -0.48 1.7
--.ROB.Z. 1987-04-24T16:21:43.80 10.0 undecidable manual PN 51 0.0177 0.21 1.9
--.SOO.Z. 1987-04-24T16:21:41.40 10.0 undecidable manual PN 34 0.0156 0.98 1.2
--.DA9.Z. 1987-04-24T16:21:40.00 10.0 undecidable manual PN 37 0.0161 -1.23 0.9
--.IMP.Z. 1987-04-24T16:21:40.20 10.0 undecidable manual PN 61 0.0159 -0.66 1.6
--.STV.Z. 1987-04-24T16:21:38.70 10.0 undecidable manual PN 44 0.0148 -0.45 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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