Earthquake with magnitude of Md 2.3 on date 08-07-1987 and time 08:36:39 (Italy) in region 3 km NW Sortino (SR)

A magnitude Md 2.3 earthquake occured in region: 3 km NW Sortino (SR), on

  • 08-07-1987 06:36:39 (UTC)
  • 08-07-1987 08:36:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.189, 15.021 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
Sortino SR 3 8690 8690
Melilli SR 10 13621 22311
Carlentini SR 10 17798 40109
Ferla SR 10 2523 42632
Lentini SR 11 24085 66717
Cassaro SR 11 821 67538
Solarino SR 13 8091 75629
Francofonte SR 13 12800 88429
Priolo Gargallo SR 15 12091 100520
Buccheri SR 17 1999 102519
Buscemi SR 17 1051 103570
Floridia SR 17 22762 126332
Canicattini Bagni SR 17 7109 133441
Palazzolo Acreide SR 17 8808 142249
Augusta SR 18 36305 178554
Scordia CT 20 17095 195649

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km NW of Siracusa (122291 inhabitants)
36 Km S of Catania (314555 inhabitants)
39 Km NE of Ragusa (73313 inhabitants)
43 Km NE of Modica (54633 inhabitants)
49 Km S of Acireale (52622 inhabitants)
50 Km NE of Vittoria (63339 inhabitants)
70 Km E of Gela (75827 inhabitants)
91 Km E of Caltanissetta (63360 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 2.3
ML-VAX 1.8
1987-07-08
06:36:39
37.189 15.021 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 51339
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-07-08 06:36:39 ± 0.666
Latitude 37.1890 ± 0.0352
Longitude 15.0210 ± 0.0578
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 51339

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) 6442.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 184
Number of associated phases, regardless of their use for origin computation 5
Number of defining phases 5
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) 0.0013
Epicentral distance of station farthest from the epicenter (degree) 0.00923
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 51339
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:49:47

ML:1.8

Field Value
Value 1.8
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 51339
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
--.ATN.Z. 1987-07-08T06:37:01.10 10.0 undecidable manual PG 19 0.0092 0.55 0.4
--.MEU.Z. 1987-07-08T06:36:47.63 10.0 undecidable manual SG 242 0.0015 1.03 0.1
--.PZI.Z. 1987-07-08T06:36:46.82 10.0 undecidable manual SG 203 0.0013 1.13 0.1
--.MEU.Z. 1987-07-08T06:36:43.26 10.0 negative manual PG 242 0.0015 -0.47 2
--.PZI.Z. 1987-07-08T06:36:42.86 10.0 negative manual PG 203 0.0013 -0.34 2.4
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