ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 2.0 on date 27-02-1987 and time 10:52:39 (Italy) in region Confine Italia Francia (FRANCIA)

A magnitude Md 2.0 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 27-02-1987 09:52:39 (UTC)
  • 27-02-1987 10:52:39 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.28, 6.88 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Argentera CN 14 83 83
Pietraporzio CN 14 77 160
Sambuco CN 17 92 252

Municipalities with at least 50000 inhabitants

An earthquake occurred to
55 Km W of Cuneo (56081 inhabitants)
88 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
Rev 1000 Md 2.0 1987-02-27
09:52:39
44.28 6.88 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 42139
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-02-27 09:52:39 ± 0.589
Latitude 44.28 ± 0.02
Longitude 6.88 ± 0.04
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 42139

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) 3881.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 260
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00243
Epicentral distance of station farthest from the epicenter (degree) 0.0085
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

Field Value
Value 2
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 42139
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:41:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.FIN.Z. 1987-02-27T09:53:11.60 10.0 undecidable manual SG 93 0.0085 -0.66 0.3
--.IMP.Z. 1987-02-27T09:53:09.00 10.0 undecidable manual SG 116 0.0072 1.33 0
--.ROB.Z. 1987-02-27T09:53:04.70 10.0 undecidable manual SG 87 0.0063 0.23 0.7
--.FIN.Z. 1987-02-27T09:52:57.80 10.0 undecidable manual PG 93 0.0085 -0.73 0.7
--.RSP.Z. 1987-02-27T09:52:57.70 10.0 undecidable manual PG 16 0.0082 -0.16 1.6
--.IMP.Z. 1987-02-27T09:52:56.60 10.0 undecidable manual PG 116 0.0072 0.72 0.8
--.ROB.Z. 1987-02-27T09:52:53.90 10.0 undecidable manual PG 87 0.0063 -0.14 1.9
--.DA9.Z. 1987-02-27T09:52:53.00 10.0 undecidable manual SG 48 0.0031 0.21 0.8
--.STV.Z. 1987-02-27T09:52:51.50 10.0 undecidable manual SG 94 0.0028 -0.5 0.6
--.SOO.Z. 1987-02-27T09:52:51.60 10.0 undecidable manual SG 34 0.0024 0.98 0.2
--.DA9.Z. 1987-02-27T09:52:47.00 10.0 undecidable manual PG 48 0.0031 -0.29 1.9
--.SOO.Z. 1987-02-27T09:52:46.10 10.0 undecidable manual PG 34 0.0024 0.06 2.2
--.STV.Z. 1987-02-27T09:52:46.20 10.0 undecidable manual PG 94 0.0028 -0.64 1.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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