Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 22-12-2021 and time 07:19:34 (Italy) in region 5 km W Siracusa (SR)

A magnitude ML 1.6 earthquake occured in region: 5 km W Siracusa (SR), on

  • 22-12-2021 06:19:34 (UTC)
  • 22-12-2021 07:19:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.0740, 15.2390 at 24 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 5 122291 122291
Floridia SR 8 22762 145053
Priolo Gargallo SR 11 12091 157144
Solarino SR 11 8091 165235
Melilli SR 15 13621 178856
Canicattini Bagni SR 16 7109 185965
Augusta SR 18 36305 222270

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km W of Siracusa (122291 inhabitants)
48 Km E of Ragusa (73313 inhabitants)
49 Km NE of Modica (54633 inhabitants)
50 Km S of Catania (314555 inhabitants)
60 Km S of Acireale (52622 inhabitants)
64 Km E of Vittoria (63339 inhabitants)
88 Km E of Gela (75827 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 1.6 2021-12-22
06:19:34		 37.074 15.2388 24 2022-03-30
13:04:26		 Bollettino Sismico Italiano INGV 99317351
Reviewed
Rev100 		ML 1.7 2021-12-22
06:19:34		 37.0732 15.2685 24 2021-12-22
06:24:14		 Sala Sismica INGV-Roma 98808191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-22 06:19:34 ± 0.18
Latitude 37.0740 ± 0.0045
Longitude 15.2388 ± 0.0090
Depth (km) 24 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99317351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 599
Semi-minor axis of confidence ellipse (meter) 557
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 82
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 241
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.42988
Number of stations at which the event was observed 24
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 18
Type of magnitude ML
Reference to an origin 98808191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-22 06:24:14

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 28
Type of magnitude ML
Reference to an origin 99317351
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-04 16:19:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.OSSC.HHZ. 2021-12-22T06:21:15.71 3.0 undecidable manual Pn 0.64 0
IT.CSO1.HGZ. 2021-12-22T06:21:03.07 3.0 negative manual Pg 13.82 0
IV.OFFI.HHZ. 2021-12-22T06:21:00.01 3.0 undecidable manual Pn 2.07 0
IV.SENA.HHZ. 2021-12-22T06:20:55.08 3.0 undecidable manual Pn -0.86 0
IV.VIVA.HHZ. 2021-12-22T06:20:44.61 3.0 negative manual Pn -1.69 0
IV.IST3.HHZ. 2021-12-22T06:20:37.51 3.0 undecidable manual Sg 9.96 0
OT.OT17.EHZ. 2021-12-22T06:20:32.31 3.0 positive manual Pn -5.44 0
IV.SPS2.HHZ. 2021-12-22T06:20:31.99 3.0 undecidable manual Sn -5.83 0
IV.MTMR.EHZ. 2021-12-22T06:20:23.06 3.0 undecidable manual Pn -4.79 0
IV.PLLN.EHZ. 2021-12-22T06:20:18.79 3.0 undecidable manual Sn -2.99 0
IV.PZUN.HHZ. 2021-12-22T06:20:17.49 3.0 positive manual Pn -5.69 0
MN.VAE.HHZ. 2021-12-22T06:20:16.30 3.0 undecidable manual Sg 5.47 0
IY.OPPI.HHZ. 2021-12-22T06:20:12.71 3.0 undecidable manual S 0.21 0
MN.VAE.HHZ. 2021-12-22T06:19:53.71 3.0 undecidable manual Pg 4.11 0
IV.MPNC.HHZ. 2021-12-22T06:19:52.73 3.0 undecidable manual Pg 2.67 0
IV.MTTG.HHE. 2021-12-22T06:19:52.95 3.0 undecidable manual P -0.12 0
IV.HVZN.HHZ. 2021-12-22T06:19:51.09 0.6 undecidable manual S 284 47.7189 109 0.67 41
IV.HLNI.HHZ. 2021-12-22T06:19:49.50 0.3 undecidable manual S 313 44.4222 111 -0.11 69
IV.ISPIC.EHZ. 2021-12-22T06:19:49.50 1.0 undecidable manual S 223 44.1225 111 -0.02 24
IV.HMDC.HHZ. 2021-12-22T06:19:48.90 0.6 undecidable manual S 253 42.3243 112 -0.18 46
IV.EVRN.HHZ. 2021-12-22T06:19:48.53 3.0 negative manual Pg 3.07 0
IV.HCRL.HHZ. 2021-12-22T06:19:46.27 0.3 undecidable manual S 322 29.5482 122 0.24 71
IV.HAGA.HHZ. 2021-12-22T06:19:44.89 0.3 undecidable manual S 342 24.5532 128 -0.06 73
IV.HVZN.HHZ. 2021-12-22T06:19:43.87 0.6 undecidable manual P 284 47.7189 109 0.12 47
IV.SSY.HHZ. 2021-12-22T06:19:43.51 0.3 undecidable manual S 302 17.2716 139 -0.04 74
IV.HLNI.HHZ. 2021-12-22T06:19:43.10 0.1 negative manual P 313 44.4222 111 -0.18 92
IV.ISPIC.EHZ. 2021-12-22T06:19:43.14 0.3 undecidable manual P 223 44.1225 111 -0.09 71
IV.HMDC.HHZ. 2021-12-22T06:19:42.85 0.1 positive manual P 253 42.3243 112 -0.12 93
IV.HCRL.HHZ. 2021-12-22T06:19:41.35 0.1 negative manual P 322 29.5482 122 0.14 96
IV.HSRS.HHZ. 2021-12-22T06:19:41.77 0.6 undecidable manual S 324 2.5974 173 -0.15 50
IV.HAGA.HHZ. 2021-12-22T06:19:40.59 0.1 negative manual P 342 24.5532 128 0 99
IV.SSY.HHZ. 2021-12-22T06:19:39.80 0.1 positive manual P 302 17.2716 139 0.02 100
IV.HSRS.HHZ. 2021-12-22T06:19:38.87 0.3 undecidable manual P 324 2.5974 173 0.03 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HSRS.HHN. ML:1.4 0.00018758360999999998 0.0992 AML other m 2021-12-22T06:19:41.99
IV.HSRS.HHE. ML:1.2 0.000101729545 0.0576 AML other m 2021-12-22T06:19:42.08
IV.HMDC.HNE. ML:1.6 0.00010781620499999999 0.7296 AML other m 2021-12-22T06:19:42.35
IV.HSRS.HNN. ML:1.9 0.0005745463 0.4096 AML other m 2021-12-22T06:19:43.31
IV.SSY.HHE. ML:1.6 0.00020320440000000002 0.0992 AML other m 2021-12-22T06:19:44.27
IV.SSY.HNN. ML:1.5 0.00016230335000000002 0.1504 AML other m 2021-12-22T06:19:44.98
IV.SSY.HHN. ML:2.0 0.0005803524500000001 0.1408 AML other m 2021-12-22T06:19:44.91
IV.HAGA.HHE. ML:1.5 0.00014276687499999998 0.0832 AML other m 2021-12-22T06:19:45.18
IV.HAGA.HHN. ML:1.4 0.000121044775 0.08 AML other m 2021-12-22T06:19:45.45
IV.HCRL.HHN. ML:1.4 0.000090534705 0.1216 AML other m 2021-12-22T06:19:46.44
IV.HCRL.HHE. ML:1.3 0.00007612951799999999 0.16 AML other m 2021-12-22T06:19:48.88
IV.HMDC.HHN. ML:1.7 0.00013821937 0.1216 AML other m 2021-12-22T06:19:49.04
IV.HMDC.HHE. ML:1.5 0.00008047205 0.0608 AML other m 2021-12-22T06:19:49.12
IV.SSY.HNE. ML:1.4 0.000144611 0.1696 AML other m 2021-12-22T06:19:49.40
IV.HSRS.HNE. ML:1.2 0.00010101371000000001 0.8896 AML other m 2021-12-22T06:19:49.79
IV.HLNI.HHE. ML:1.3 0.000057334875 0.0992 AML other m 2021-12-22T06:19:50.83
IV.HLNI.HHN. ML:1.3 0.00004929954 0.08 AML other m 2021-12-22T06:19:51.64
IV.HVZN.HHN. ML:1.6 0.00009929691 0.2976 AML other m 2021-12-22T06:19:53.23
IV.HMDC.HNN. ML:1.7 0.00013497055 0.5696 AML other m 2021-12-22T06:19:54.41
IV.MPNC.HHE. ML:1.7 0.000039254205 0.5408 AML other m 2021-12-22T06:20:03.55
IV.HVZN.HHE. ML:1.6 0.00009240011500000001 0.9024 AML other m 2021-12-22T06:20:05.72
IV.EVRN.HHN. ML:2.8 0.001089 0.08 AML other m 2021-12-22T06:20:10.57
IV.MPNC.HHN. ML:1.9 0.00005674946 0.9216 AML other m 2021-12-22T06:20:11.13
IV.EVRN.HNN. ML:2.8 0.0011149999999999999 0.08 AML other m 2021-12-22T06:20:13.86
IV.EVRN.HHE. ML:2.9 0.001185 0.06 AML other m 2021-12-22T06:20:15.04
IV.EVRN.HNE. ML:2.6 0.0007409723 0.08 AML other m 2021-12-22T06:20:16.28
MN.VAE.HHE. ML:2.1 0.0001384 0.3 AML other m 2021-12-22T06:20:41.37
MN.VAE.HHN. ML:1.8 0.000065052815 0.4224 AML other m 2021-12-22T06:20:41.43
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