Earthquake with magnitude of Md 2.4 on date 04-05-1987 and time 08:18:32 (Italy) in region Costa Siciliana nord occidentale (Trapani)

A magnitude Md 2.4 earthquake occured in region: Costa Siciliana nord occidentale (Trapani), on

  • 04-05-1987 06:18:32 (UTC)
  • 04-05-1987 08:18:32 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 38.2400, 12.6550 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
San Vito Lo Capo TP 10 4654 4654
Custonaci TP 18 5566 10220

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km NE of Trapani (68759 inhabitants)
53 Km NE of Marsala (83194 inhabitants)
63 Km W of Palermo (674435 inhabitants)
66 Km N of Mazara del Vallo (51718 inhabitants)
77 Km W of Bagheria (55387 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 2.4 1987-05-04
06:18:32
38.24 12.655 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 46309
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-05-04 06:18:32 ± 0.956
Latitude 38.2400 ± 0.0503
Longitude 12.6550 ± 0.0699
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 46309

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) 8279.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 268
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
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) 0.00186
Epicentral distance of station farthest from the epicenter (degree) 0.00996
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 46309
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:45:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.GIB.Z. 1987-05-04T06:19:10.00 10.0 undecidable manual SN 102 1.11 1.14 0.1
--.GIB.Z. 1987-05-04T06:18:53.00 10.0 undecidable manual PN 102 1.11 -0.3 1.3
--.CVT.Z. 1987-05-04T06:18:51.50 10.0 undecidable manual SG 169 0.5661 -0.83 0.3
--.CVT.Z. 1987-05-04T06:18:43.50 10.0 undecidable manual PG 169 0.5661 -0.25 1.9
--.ERC.Z. 1987-05-04T06:18:41.50 10.0 undecidable manual SG 194 0.2109 0.78 0.4
--.ERC.Z. 1987-05-04T06:18:37.00 10.0 undecidable manual PG 194 0.2109 -0.05 2.1
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