Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 21-07-2013 and time 00:11:50 (UTC) in region 4 km SW Castel di Iudica (CT)

A magnitude ML 1.7 earthquake occured in region: 4 km SW Castel di Iudica (CT), on

  • 21-07-2013 00:11:50 (UTC)
  • 21-07-2013 02:11:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.4780, 14.6090 at 36 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Castel di Iudica CT 4 4625 4625
Raddusa CT 7 3178 7803
Catenanuova EN 13 4866 12669
Ramacca CT 13 10894 23563
Aidone EN 16 4889 28452
Valguarnera Caropepe EN 20 7866 36318
Regalbuto EN 20 7277 43595
Centuripe EN 20 5470 49065

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km W of Catania (314555 inhabitants)
48 Km E of Caltanissetta (63360 inhabitants)
51 Km W of Acireale (52622 inhabitants)
56 Km NE of Gela (75827 inhabitants)
59 Km N of Vittoria (63339 inhabitants)
62 Km N of Ragusa (73313 inhabitants)
70 Km N of Modica (54633 inhabitants)
76 Km NW of Siracusa (122291 inhabitants)
92 Km E of Agrigento (59770 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 		ML 1.7 2013-07-21
00:11:50		 37.478 14.6092 36 2015-01-20
11:28:06		 Bollettino Sismico Italiano INGV 4126361
Reviewed
Rev100 		ML 1.7 2013-07-21
00:11:50		 37.5373 14.6012 10 2014-10-21
12:08:56		 Sala Sismica INGV-Roma 4115081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2013-07-21 00:11:50 ± 0.32
Latitude 37.4780 ± 0.0108
Longitude 14.6092 ± 0.0181
Depth (km) 36 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 4126361

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1647
Semi-minor axis of confidence ellipse (meter) 869
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 51
Circular confidence region, given by single value of horizontal uncertainty (meter) 1650.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 128
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.16817
Epicentral distance of station farthest from the epicenter (degree) 0.65920
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 3
Type of magnitude ML
Reference to an origin 4115081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2013-07-21 00:17:29

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 2
Type of magnitude ML
Reference to an origin 4126361
Agency INGV
Autore Manually reviewed by Franco Mele
Time of creation (UTC) 2015-01-15 12:56:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAVL.HHZ. 2013-07-21T00:12:14.08 0.6 undecidable manual S 142 73.1712 54 0.43 44
IV.SSY.HHE. 2013-07-21T00:12:09.65 0.6 undecidable manual S 131 54.2013 120 0.54 43
IV.MEU.SHZ. 2013-07-21T00:12:06.96 0.6 undecidable manual S 154 45.1215 125 -0.09 49
IV.HCRL.HHZ. 2013-07-21T00:12:06.40 0.3 undecidable manual S 120 43.1235 126 -0.22 72
IV.RAFF.HHZ. 2013-07-21T00:12:05.50 0.3 undecidable manual S 218 35.742 132 0.42 70
IV.HVZN.HHZ. 2013-07-21T00:12:04.50 0.6 undecidable manual S 164 34.5432 133 -0.35 47
IV.GALF.HHE. 2013-07-21T00:12:04.36 0.6 undecidable manual S 352 26.0517 141 1.05 36
IV.HAVL.HHZ. 2013-07-21T00:12:03.77 0.1 undecidable manual P 142 73.1712 54 -0.03 93
IV.SSY.HHE. 2013-07-21T00:12:01.29 0.3 undecidable manual P 131 54.2013 120 0.11 72
IV.CAGR.HHE. 2013-07-21T00:12:01.36 0.6 undecidable manual S 329 18.6702 151 -0.84 42
IV.MEU.SHZ. 2013-07-21T00:12:00.15 0.1 undecidable manual P 154 45.1215 125 0.16 97
IV.HCRL.HHZ. 2013-07-21T00:11:59.60 0.1 undecidable manual P 120 43.1235 126 -0.14 97
IV.RAFF.HHZ. 2013-07-21T00:11:58.62 0.1 undecidable manual P 218 35.742 132 -0.24 96
IV.HVZN.HHZ. 2013-07-21T00:11:58.54 0.1 undecidable manual P 164 34.5432 133 -0.18 98
IV.GALF.HHE. 2013-07-21T00:11:57.53 0.3 undecidable manual P 352 26.0517 141 -0.31 73
IV.CAGR.HHE. 2013-07-21T00:11:57.41 0.1 undecidable manual P 329 18.6702 151 0.22 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HVZN.HHN. ML:2.1 0.00032999999999999994 0.44 AML other m 2013-07-21T00:12:05.77
IV.MEU.SHN. ML:1.6 0.00009850000000000001 0.24 AML other m 2013-07-21T00:12:07.63
IV.MEU.SHE. ML:1.5 0.000076 1.36 AML other m 2013-07-21T00:12:09.47
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