Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 27-12-2021 and time 06:55:55 (Italy) in region Costa Siracusana (Siracusa)

A magnitude ML 1.5 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 27-12-2021 05:55:55 (UTC)
  • 27-12-2021 06:55:55 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.0680, 15.4870 at 22 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 17 122291 122291

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km E of Siracusa (122291 inhabitants)
60 Km SE of Catania (314555 inhabitants)
67 Km SE of Acireale (52622 inhabitants)
69 Km E of Modica (54633 inhabitants)
69 Km E of Ragusa (73313 inhabitants)
85 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 1.5 2021-12-27
05:55:55		 37.0682 15.4872 22 2022-03-30
13:04:33		 Bollettino Sismico Italiano INGV 100411861
Reviewed
Rev100 		ML 1.4 2021-12-27
05:55:55		 37.0757 15.4738 20 2021-12-27
06:03:16		 Sala Sismica INGV-Roma 99043491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-27 05:55:55 ± 0.13
Latitude 37.0682 ± 0.0117
Longitude 15.4872 ± 0.0079
Depth (km) 22 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 100411861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1230
Semi-minor axis of confidence ellipse (meter) 494
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 348
Circular confidence region, given by single value of horizontal uncertainty (meter) 1230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 304
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.79680
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 100411861
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-31 18:01:16

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 99043491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-27 06:03:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.COLB.HHZ. 2021-12-27T05:57:44.30 3.0 undecidable manual Sn -4 0
IV.CRTC.HHZ. 2021-12-27T05:57:39.08 3.0 negative manual Pn 1.3 0
IV.GAVE.EHZ. 2021-12-27T05:57:20.40 3.0 undecidable manual Pn -3.34 0
OT.OT17.EHZ. 2021-12-27T05:57:15.45 3.0 negative manual Pg 10.27 0
IV.CET2.HHZ. 2021-12-27T05:57:13.70 3.0 undecidable manual Sg 0.36 0
IT.PLTA.HNZ. 2021-12-27T05:57:05.41 3.0 undecidable manual Pn -2.98 0
IV.MTGR.HHZ. 2021-12-27T05:57:04.19 3.0 undecidable manual Sn -1.11 0
IV.RESU.HHZ. 2021-12-27T05:56:35.73 3.0 undecidable manual S -5.39 0
IV.HVIT.HHE. 2021-12-27T05:56:21.48 0.6 undecidable manual S 265 85.9473 98 0.21 43
IV.CROCE.HHE. 2021-12-27T05:56:21.74 0.3 undecidable manual S 253 88.4448 98 -0.19 67
IV.HLNI.HHZ. 2021-12-27T05:56:15.18 0.3 undecidable manual S 300 62.5929 102 0.03 70
IV.CROCE.HHE. 2021-12-27T05:56:10.64 0.3 undecidable manual P 253 88.4448 98 -0.19 66
IV.HVIT.HHE. 2021-12-27T05:56:10.60 0.3 undecidable manual P 265 85.9473 98 0.15 66
IV.HAGA.HHZ. 2021-12-27T05:56:08.55 0.3 undecidable manual S 309 37.9287 112 -0.29 72
IV.SSY.HHZ. 2021-12-27T05:56:08.74 0.3 undecidable manual S 285 37.9287 112 -0.08 75
IV.HMDC.HHE. 2021-12-27T05:56:07.01 0.3 undecidable manual P 259 63.492 102 -0.04 71
IV.HLNI.HHZ. 2021-12-27T05:56:06.77 0.3 undecidable manual P 300 62.5929 102 -0.15 70
IV.HSRS.HHZ. 2021-12-27T05:56:05.24 0.6 undecidable manual S 277 23.6541 126 -0.23 50
IV.SSY.HHZ. 2021-12-27T05:56:03.40 0.1 undecidable manual P 285 37.9287 112 0.14 97
IV.HAGA.HHZ. 2021-12-27T05:56:03.26 0.3 undecidable manual P 309 37.9287 112 -0.01 75
IV.HSRS.HHZ. 2021-12-27T05:56:01.44 0.1 undecidable manual P 277 23.6541 126 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HSRS.HHE. ML:1.2 0.00007014716 0.0192 AML other m 2021-12-27T05:56:05.36
IV.HSRS.HHN. ML:1.4 0.00012022992500000001 1.0592 AML other m 2021-12-27T05:56:06.29
IV.SSY.HNN. ML:1.6 0.000114883235 1.888 AML other m 2021-12-27T05:56:09.99
IV.SSY.HNE. ML:1.5 0.00010300793 0.1696 AML other m 2021-12-27T05:56:09.91
IV.SSY.HHN. ML:2.1 0.00039949999999999995 1.32 AML other m 2021-12-27T05:56:10.06
IV.SSY.HHE. ML:1.9 0.000258 0.42 AML other m 2021-12-27T05:56:10.90
IV.HLNI.HHE. ML:1.3 0.000039962015 0.24 AML other m 2021-12-27T05:56:15.55
IV.HLNI.HHN. ML:1.2 0.000027591455 0.08 AML other m 2021-12-27T05:56:17.28
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