Earthquake with magnitude of Md 3.3 on date 15-10-1987 and time 07:52:16 (Italy) in region Costa Siracusana (Siracusa)

A magnitude Md 3.3 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 15-10-1987 06:52:16 (UTC)
  • 15-10-1987 07:52:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.104, 15.497 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
Siracusa SR 19 122291 122291

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km E of Siracusa (122291 inhabitants)
57 Km SE of Catania (314555 inhabitants)
64 Km SE of Acireale (52622 inhabitants)
71 Km E of Modica (54633 inhabitants)
71 Km E of Ragusa (73313 inhabitants)
87 Km E of Vittoria (63339 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 3.3
ML-VAX 3.2
1987-10-15
06:52:16
37.104 15.497 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 56999
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-10-15 06:52:16 ± 0.397
Latitude 37.1040 ± 0.0273
Longitude 15.4970 ± 0.0250
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 56999

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) 3760.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 234
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
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) 0.00478
Epicentral distance of station farthest from the epicenter (degree) 0.03724
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

Md:3.3

Field Value
Value 3.3
Uncertainty
Num. used stations 7
Type of magnitude Md
Reference to an origin 56999
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:54:40

ML:3.2

Field Value
Value 3.2
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 56999
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.BAI.Z. 1987-10-15T06:53:20.00 10.0 undecidable manual PN? 14 0.0372 -0.09 0.4
--.CDM.Z. 1987-10-15T06:53:19.00 10.0 undecidable manual PN 7 0.0361 0.64 0.7
--.PE1.Z. 1987-10-15T06:53:16.50 10.0 undecidable manual PN 20 0.0359 -1.51 0.1
--.ORI.Z. 1987-10-15T06:53:04.60 10.0 undecidable manual PN 13 0.0273 -0.31 1.2
--.GIB.Z. 1987-10-15T06:53:04.52 10.0 undecidable manual SN 307 0.0131 1.51 0
--.MGR.Z. 1987-10-15T06:53:04.29 10.0 undecidable manual PN 0 0.0273 -0.56 0.9
--.CSI.Z. 1987-10-15T06:53:02.00 10.0 undecidable manual PN 12 0.0247 1.01 0.4
--.MMN.Z. 1987-10-15T06:53:02.50 10.0 undecidable manual PN 7 0.0253 0.68 0.8
--.PTS.Z. 1987-10-15T06:53:01.81 10.0 undecidable manual PN 264 0.0253 0 1.4
--.MSI.Z. 1987-10-15T06:52:55.00 10.0 undecidable manual SN 2 0.0099 0.63 0.4
--.CZI.Z. 1987-10-15T06:52:53.00 10.0 undecidable manual PN 12 0.0195 -0.04 1.6
--.SE2.Z. 1987-10-15T06:52:53.00 10.0 undecidable manual PN 26 0.0192 0.5 1.2
--.SOI.Z. 1987-10-15T06:52:53.47 10.0 undecidable manual SG 23 0.0096 0.04 0.7
--.MNO.Z. 1987-10-15T06:52:52.19 10.0 undecidable manual SG 322 0.0094 -0.58 0.4
--.GRI.Z. 1987-10-15T06:52:49.50 10.0 undecidable manual PN 22 0.0168 0.67 1
--.RI2.Z. 1987-10-15T06:52:44.50 10.0 undecidable manual PN 29 0.0137 0.29 1.5
--.GIB.Z. 1987-10-15T06:52:43.55 10.0 positive manual PN 307 0.0131 0.24 3.1
--.MSI.Z. 1987-10-15T06:52:39.00 10.0 undecidable manual PN 2 0.0099 0.68 1
--.ATN.Z. 1987-10-15T06:52:37.30 10.0 undecidable manual PG 358 0.0095 -0.28 1.5
--.FE2.Z. 1987-10-15T06:52:37.00 10.0 undecidable manual PG 25 0.0094 -0.41 1.4
--.MNO.Z. 1987-10-15T06:52:37.90 10.0 undecidable manual PG 322 0.0094 -0.31 1.5
--.SOI.Z. 1987-10-15T06:52:36.83 10.0 undecidable manual PG 23 0.0096 -0.95 0.6
--.MT1.Z. 1987-10-15T06:52:34.80 10.0 undecidable manual PG 9 0.0083 -0.45 1.3
--.MEU.Z. 1987-10-15T06:52:27.11 10.0 undecidable manual PG 270 0.0048 -0.79 0.8
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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