ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 3.3 on date 04-12-1985 and time 19:24:48 (Italy) in region Canale di Sicilia settentrionale (MARE)

A magnitude Md 3.3 earthquake occured in region: Canale di Sicilia settentrionale (MARE), on

  • 04-12-1985 18:24:48 (UTC)
  • 04-12-1985 19:24:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.58, 11.85 at 8 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

An earthquake occurred to
57 Km W of Marsala (83194 inhabitants)
66 Km W of Mazara del Vallo (51718 inhabitants)
76 Km SW of Trapani (68759 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 3.3 1985-12-04
18:24:48
37.58 11.85 8 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 17409
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-12-04 18:24:48 ± 0.663
Latitude 37.58 ± 0.03
Longitude 11.85 ± 0.06
Depth (km) 8 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 17409

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) 6150.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 240
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
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) 0.00664
Epicentral distance of station farthest from the epicenter (degree) 0.02267
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

Md:3.3

Field Value
Value 3.3
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 17409
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:20:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.PZI.Z. 1985-12-04T18:26:00.00 10.0 undecidable manual SN 101 0.0227 0.18 0.4
--.PZI.Z. 1985-12-04T18:25:30.00 10.0 undecidable manual PN 101 0.0227 0.17 1
--.GIB.Z. 1985-12-04T18:25:19.50 10.0 undecidable manual PN 76 0.0159 -0.02 1.3
--.FAI.Z. 1985-12-04T18:25:16.50 10.0 undecidable manual PN 102 0.0133 0.94 0.2
--.PT9.Z. 1985-12-04T18:25:15.50 10.0 undecidable manual SG 171 0.007 -0.83 0.1
--.CV9.Z. 1985-12-04T18:25:14.50 10.0 undecidable manual SG 82 0.0067 -0.89 0.1
--.ERC.Z. 1985-12-04T18:25:14.80 10.0 undecidable manual SG 52 0.0066 -0.13 0.9
--.CV9.Z. 1985-12-04T18:25:04.50 10.0 positive manual PG 82 0.0067 0.32 2.5
--.PT9.Z. 1985-12-04T18:25:04.50 10.0 undecidable manual PG 171 0.007 -0.22 1.4
--.ERC.Z. 1985-12-04T18:25:03.50 10.0 positive manual PG 52 0.0066 -0.41 2.1
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