Earthquake with magnitude of Md 2.8 on date 23-04-1993 and time 09:28:30 (UTC) in region Costa Siciliana sud occidentale (Trapani)

A magnitude Md 2.8 earthquake occured in region: Costa Siciliana sud occidentale (Trapani), on

  • 23-04-1993 09:28:30 (UTC)
  • 23-04-1993 11:28:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.48, 12.756 at 5 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
Campobello di Mazara TP 17 11956 11956

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SE of Mazara del Vallo (51718 inhabitants)
45 Km SE of Marsala (83194 inhabitants)
64 Km SE of Trapani (68759 inhabitants)
76 Km W of Agrigento (59770 inhabitants)
89 Km SW of Palermo (674435 inhabitants)
94 Km SW of Bagheria (55387 inhabitants)
Recent and historical seismicity
Seismic hazard
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Md 2.8 1993-04-23
37.48 12.756 5 2013-07-15
Bollettino Sismico Italiano INGV 183899
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 1993-04-23 09:28:30 ± 1.028
Latitude 37.4800 ± 0.0577
Longitude 12.7560 ± 0.0637
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 183899


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) 8534.3
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 280
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.0051
Epicentral distance of station farthest from the epicenter (degree) 0.01085
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information


Field Value
Value 2.8
Num. used stations 2
Type of magnitude Md
Reference to an origin 183899
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:52:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CS9.Z. 1993-04-23T09:29:10.90 10.0 undecidable manual SN 65 0.0102 1.07 0.2
--.GIB.Z. 1993-04-23T09:29:08.90 10.0 undecidable manual SN 62 0.0101 -0.69 0.4
--.CS9.Z. 1993-04-23T09:28:53.59 10.0 undecidable manual PN 65 0.0102 0.18 1.8
--.GIB.Z. 1993-04-23T09:28:53.74 10.0 undecidable manual PN 62 0.0101 0.47 1.4
--.PL9.Z. 1993-04-23T09:28:53.50 10.0 undecidable manual PN 64 0.0108 -0.92 0.6
--.ERC.Z. 1993-04-23T09:28:51.86 10.0 undecidable manual SG 346 0.0051 -0.34 0.7
--.ERC.Z. 1993-04-23T09:28:43.48 10.0 undecidable manual PG 346 0.0051 0.25 1.9
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download