Earthquake with magnitude of Md 3.7 on date 18-12-1985 and time 17:17:02 (Italy) in region Costa Siracusana (Siracusa)

A magnitude Md 3.7 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 18-12-1985 16:17:02 (UTC)
  • 18-12-1985 17:17:02 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 36.81, 15.57 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

An earthquake occurred to
37 Km SE of Siracusa (122291 inhabitants)
72 Km E of Modica (54633 inhabitants)
76 Km E of Ragusa (73313 inhabitants)
88 Km SE of Catania (314555 inhabitants)
93 Km E of Vittoria (63339 inhabitants)
96 Km SE of Acireale (52622 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 3.7 1985-12-18
16:17:02
36.81 15.57 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 18379
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-12-18 16:17:02 ± 0.547
Latitude 36.81 ± 0.04
Longitude 15.57 ± 0.03
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 18379

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) 5249.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 242
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
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) 0.00494
Epicentral distance of station farthest from the epicenter (degree) 0.0442
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitude information

Md:3.7

Field Value
Value 3.7
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 18379
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:21:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SGO.Z. 1985-12-18T16:18:43.00 10.0 undecidable manual SN 356 0.0337 0.45 0.6
--.DUI.Z. 1985-12-18T16:18:15.50 10.0 undecidable manual PN 349 0.0442 -1 0.4
--.BAI.Z. 1985-12-18T16:18:09.00 10.0 undecidable manual PN 12 0.0397 -0.51 0.9
--.BRT.Z. 1985-12-18T16:18:07.00 10.0 undecidable manual PN 15 0.0381 -0.17 1.1
--.PE1.Z. 1985-12-18T16:18:06.50 10.0 undecidable manual PN 18 0.0381 -0.71 0.7
--.LCI.Z. 1985-12-18T16:18:03.50 10.0 undecidable manual PN 28 0.0363 -0.93 0.5
--.SGO.Z. 1985-12-18T16:18:01.50 10.0 undecidable manual PN 356 0.0337 1.05 0.4
--.ORI.Z. 1985-12-18T16:17:55.50 10.0 undecidable manual PN 11 0.0297 1.13 0.4
--.GIB.Z. 1985-12-18T16:17:53.50 10.0 undecidable manual SN 313 0.0152 -0.32 0.5
--.ROI.Z. 1985-12-18T16:17:49.60 10.0 undecidable manual PN 15 0.0257 1.29 0.3
--.PT9.Z. 1985-12-18T16:17:48.00 10.0 undecidable manual PN 270 0.0257 -0.32 1.3
--.ERC.Z. 1985-12-18T16:17:47.00 10.0 undecidable manual PN 297 0.024 1.41 0.2
--.MSI.Z. 1985-12-18T16:17:46.00 10.0 undecidable manual SN 359 0.0125 -0.43 0.5
--.CZI.Z. 1985-12-18T16:17:42.20 10.0 undecidable manual PN 9 0.0219 -0.32 1.3
--.CV9.Z. 1985-12-18T16:17:41.50 10.0 undecidable manual PN 291 0.0214 -0.1 1.5
--.SE2.Z. 1985-12-18T16:17:41.80 10.0 undecidable manual PN 21 0.0213 0.26 1.4
--.DR2.Z. 1985-12-18T16:17:34.60 10.0 undecidable manual PN 8 0.0166 0.2 1.4
--.RI2.Z. 1985-12-18T16:17:33.50 10.0 undecidable manual PN 23 0.0158 0.37 1.3
--.GIB.Z. 1985-12-18T16:17:32.50 10.0 positive manual PN 313 0.0152 0.18 2.9
--.MSI.Z. 1985-12-18T16:17:28.20 10.0 undecidable manual PN 359 0.0125 0.15 1.5
--.GA2.Z. 1985-12-18T16:17:26.50 10.0 undecidable manual PN 8 0.0123 -1.27 0.3
--.PZI.Z. 1985-12-18T16:17:13.90 10.0 positive manual PG 295 0.0049 -0.45 2.5
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