Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.4 on date 21-09-2015 and time 22:36:08 (Italy) in region Costa Siracusana (Siracusa)

A magnitude ML 2.4 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 21-09-2015 20:36:08 (UTC)
  • 21-09-2015 22:36:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.1660, 15.5600 at 7 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Siracusa (122291 inhabitants)
56 Km SE of Catania (314555 inhabitants)
61 Km SE of Acireale (52622 inhabitants)
78 Km E of Ragusa (73313 inhabitants)
79 Km E of Modica (54633 inhabitants)
94 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 		ML 2.4 2015-09-21
20:36:08		 37.166 15.5602 7 2016-02-19
13:21:47		 Bollettino Sismico Italiano INGV 23154131
Reviewed
Rev100 		ML 2.5 2015-09-21
20:36:08		 37.1757 15.5543 9 2015-09-21
20:49:27		 Sala Sismica INGV-Roma 21514011
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2015-09-21 20:36:08 ± 0.24
Latitude 37.1660 ± 0.0081
Longitude 15.5602 ± 0.0113
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 23154131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 987
Semi-minor axis of confidence ellipse (meter) 670
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 314
Circular confidence region, given by single value of horizontal uncertainty (meter) 990.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 199
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.27969
Epicentral distance of station farthest from the epicenter (degree) 1.03152
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:2.4

Field Value
Value 2.4
Uncertainty 0.2
Num. used stations 11
Type of magnitude ML
Reference to an origin 23154131
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2016-01-19 11:17:36

ML:2.5

Field Value
Value 2.5
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 21514011
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2015-09-21 20:49:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ESML.HHZ. 2015-09-21T20:36:33.19 0.6 undecidable manual S 310 78.1662 50 0.36 44
IV.HMDC.HHZ. 2015-09-21T20:36:31.15 0.3 undecidable manual S 252 72.4719 50 -0.16 70
IV.HPAC.HHZ. 2015-09-21T20:36:31.02 0.6 undecidable manual S 223 68.7756 50 0.72 40
IV.HLNI.HHZ. 2015-09-21T20:36:28.53 0.3 undecidable manual S 289 64.0914 50 -0.51 66
IV.MUCR.HHZ. 2015-09-21T20:36:28.21 0.3 undecidable manual P 328 114.4965 50 0.02 66
IV.MEU.SHZ. 2015-09-21T20:36:28.81 0.6 undecidable manual S 265 64.8906 50 -0.45 44
IV.GALF.HHZ. 2015-09-21T20:36:27.67 0.1 undecidable manual P 305 106.3158 50 0.73 74
IV.NOV.HHZ. 2015-09-21T20:36:26.31 0.3 undecidable manual P 339 102.6195 50 -0.05 67
IV.RAFF.HHZ. 2015-09-21T20:36:26.84 0.1 undecidable manual P 274 106.0161 50 -0.05 89
IV.MCSR.HHZ. 2015-09-21T20:36:26.79 0.3 undecidable manual P 344 103.8183 50 0.24 65
IV.EPZF.HHZ. 2015-09-21T20:36:25.96 0.3 undecidable manual P 320 95.7264 50 0.67 58
IV.HAVL.HHZ. 2015-09-21T20:36:24.25 0.3 undecidable manual S 240 45.0216 50 0.28 72
IV.MPAZ.HHE. 2015-09-21T20:36:24.65 0.3 undecidable manual P 24 95.7264 50 -0.65 59
IV.SSY.HHZ. 2015-09-21T20:36:23.59 0.3 undecidable manual S 269 43.0236 50 0.16 74
IV.ESML.HHZ. 2015-09-21T20:36:22.57 0.1 undecidable manual P 310 78.1662 50 -0.03 95
IV.HPAC.HHZ. 2015-09-21T20:36:21.27 0.1 undecidable manual P 223 68.7756 50 0.13 94
IV.HMDC.HHZ. 2015-09-21T20:36:21.41 0.1 positive manual P 252 72.4719 50 -0.32 90
IV.HAGA.HHZ. 2015-09-21T20:36:21.82 0.6 undecidable manual S 290 38.1285 101 -0.28 48
IV.MEU.SHZ. 2015-09-21T20:36:20.06 0.1 positive manual P 265 64.8906 50 -0.48 88
IV.EPOZ.HHZ. 2015-09-21T20:36:20.80 0.1 undecidable manual P 330 64.9905 50 0.24 93
IV.HLNI.HHZ. 2015-09-21T20:36:19.97 0.1 positive manual P 289 64.0914 50 -0.45 89
IV.AGST.EHZ. 2015-09-21T20:36:19.98 0.3 undecidable manual S 289 31.0467 103 0.27 74
IV.SSY.HHZ. 2015-09-21T20:36:17.02 0.1 positive manual P 269 43.0236 50 -0.16 99
IV.HAVL.HHZ. 2015-09-21T20:36:17.58 0.1 positive manual P 240 45.0216 50 0.09 99
IV.HAGA.HHZ. 2015-09-21T20:36:16.19 0.1 undecidable manual P 290 38.1285 101 -0.22 98
IV.AGST.EHZ. 2015-09-21T20:36:15.21 0.1 positive manual P 289 31.0467 103 0.19 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.AGST.EHN. ML:2.6 0.0017749999999999999 0.18 AML other m 2015-09-21T20:36:20.15
IV.AGST.EHE. ML:2.5 0.001462 0.84 AML other m 2015-09-21T20:36:20.38
IV.ESML.HHN. ML:2.4 0.00039049999999999995 0.32 AML other m 2015-09-21T20:36:33.45
IV.ESML.HHE. ML:2.4 0.000388 0.28 AML other m 2015-09-21T20:36:33.49
IV.GALF.HHN. ML:2.0 0.00009305 0.84 AML other m 2015-09-21T20:36:43.66
IV.GALF.HHE. ML:2.1 0.00011135000000000001 0.5 AML other m 2015-09-21T20:36:48.56
IV.HAGA.HHN. ML:2.2 0.00061 0.38 AML other m 2015-09-21T20:36:21.91
IV.HAGA.HHE. ML:2.1 0.0005074999999999999 1.02 AML other m 2015-09-21T20:36:22.57
IV.HAVL.HHN. ML:2.7 0.001655 0.36 AML other m 2015-09-21T20:36:24.80
IV.HAVL.HHE. ML:2.6 0.0012150000000000002 0.2 AML other m 2015-09-21T20:36:25.86
IV.HLNI.HHE. ML:2.6 0.000773 0.26 AML other m 2015-09-21T20:36:28.82
IV.HLNI.HHN. ML:2.9 0.00145 0.4 AML other m 2015-09-21T20:36:28.82
IV.HMDC.HHN. ML:2.4 0.000383 0.82 AML other m 2015-09-21T20:36:31.49
IV.HMDC.HHE. ML:2.4 0.0003735 1.58 AML other m 2015-09-21T20:36:31.31
IV.HPAC.HHE. ML:2.9 0.0012799999999999999 0.16 AML other m 2015-09-21T20:36:31.35
IV.HPAC.HHN. ML:2.7 0.000995 1.58 AML other m 2015-09-21T20:36:36.73
IV.MCSR.HHE. ML:2.2 0.00013350000000000002 1.06 AML other m 2015-09-21T20:36:45.02
IV.MCSR.HHN. ML:2.2 0.00014749999999999998 1.52 AML other m 2015-09-21T20:36:42.26
IV.MEU.SHE. ML:0.0 0.0005064999999999999 1.56 AML other m 2015-09-21T20:36:33.56
IV.MEU.SHN. ML:0.0 0.0006670000000000001 0.4 AML other m 2015-09-21T20:36:31.30
IV.SSY.HHE. ML:2.3 0.0006014999999999999 0.5 AML other m 2015-09-21T20:36:25.51
IV.SSY.HHN. ML:2.5 0.0011455 0.3 AML other m 2015-09-21T20:36:24.50
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
Waveforms Seismic signals in miniseed + resp format Download