Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 21-04-2016 and time 21:59:17 (Italy) in region Costa Siracusana (Siracusa)

A magnitude ML 2.0 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 21-04-2016 19:59:17 (UTC)
  • 21-04-2016 21:59:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.0480, 15.5110 at 28 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
Siracusa SR 19 122291 122291

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km E of Siracusa (122291 inhabitants)
63 Km SE of Catania (314555 inhabitants)
70 Km E of Modica (54633 inhabitants)
70 Km SE of Acireale (52622 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 		ML 2.0 2016-04-21
19:59:17		 37.0483 15.5107 28 2016-05-17
13:18:32		 Bollettino Sismico Italiano INGV 24824151
Reviewed
Rev100 		ML 1.9 2016-04-21
19:59:17		 37.0565 15.5108 10 2016-04-21
20:05:53		 Sala Sismica INGV-Roma 24539651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2016-04-21 19:59:17 ± 0.3
Latitude 37.0483 ± 0.0117
Longitude 15.5107 ± 0.0169
Depth (km) 28 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 24824151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1410
Semi-minor axis of confidence ellipse (meter) 681
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 118
Circular confidence region, given by single value of horizontal uncertainty (meter) 1410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 275
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.30667
Epicentral distance of station farthest from the epicenter (degree) 0.58996
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 3
Type of magnitude ML
Reference to an origin 24824151
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2016-05-09 23:05:49

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 3
Type of magnitude ML
Reference to an origin 24539651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2016-04-21 20:05:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HMDC.HHZ. 2016-04-21T19:59:38.61 0.3 undecidable manual S 261 65.1903 107 0.75 58
IV.HLNI.HHZ. 2016-04-21T19:59:37.73 0.6 undecidable manual S 301 65.49 107 -0.22 47
IV.HPAC.HHZ. 2016-04-21T19:59:35.91 0.3 undecidable manual S 228 56.499 110 0.26 70
IV.HAGA.HHZ. 2016-04-21T19:59:31.47 0.3 undecidable manual S 310 40.9257 119 -0.41 70
IV.SSY.HHZ. 2016-04-21T19:59:31.45 0.3 undecidable manual S 288 40.5261 119 -0.32 71
IV.AGST.EHZ. 2016-04-21T19:59:30.71 0.3 undecidable manual S 313 34.0437 124 0.4 68
IV.HAVL.HHZ. 2016-04-21T19:59:30.22 0.3 undecidable manual S 254 35.8419 122 -0.47 68
IV.HLNI.HHZ. 2016-04-21T19:59:29.15 0.1 undecidable manual P 301 65.49 107 -0.07 96
IV.HMDC.HHZ. 2016-04-21T19:59:29.03 0.1 undecidable manual P 261 65.1903 107 -0.14 93
IV.HPAC.HHZ. 2016-04-21T19:59:28.11 0.1 positive manual P 228 56.499 110 0.21 93
IV.HAGA.HHZ. 2016-04-21T19:59:25.72 0.1 negative manual P 310 40.9257 119 0 98
IV.SSY.HHZ. 2016-04-21T19:59:25.72 0.1 undecidable manual P 288 40.5261 119 0.06 98
IV.HAVL.HHZ. 2016-04-21T19:59:24.97 0.1 positive manual P 254 35.8419 122 -0.07 100
IV.AGST.EHZ. 2016-04-21T19:59:24.90 0.3 undecidable manual P 313 34.0437 124 0.09 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HAVL.HHE. ML:2.0 0.00034399999999999996 0.28 AML other m 2016-04-21T19:59:30.44
IV.HAVL.HHN. ML:2.2 0.0004295 0.36 AML other m 2016-04-21T19:59:30.44
IV.HLNI.HHE. ML:1.8 0.00011195 0.24 AML other m 2016-04-21T19:59:38.20
IV.HLNI.HHN. ML:1.7 0.0000886 1.34 AML other m 2016-04-21T19:59:38.97
IV.SSY.HHN. ML:2.3 0.0005780000000000001 1.58 AML other m 2016-04-21T19:59:31.58
IV.SSY.HHE. ML:1.7 0.00015000000000000001 0.12 AML other m 2016-04-21T19:59:31.96
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