Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 21-12-2021 and time 21:29:29 (UTC) in region 10 km NE Avola (SR)

A magnitude ML 1.3 earthquake occured in region: 10 km NE Avola (SR), on

  • 21-12-2021 21:29:29 (UTC)
  • 21-12-2021 22:29:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 36.9730, 15.2220 at 28 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Avola SR 10 31708 31708
Siracusa SR 12 122291 153999
Floridia SR 14 22762 176761
Canicattini Bagni SR 16 7109 183870
Noto SR 16 23913 207783
Solarino SR 17 8091 215874

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km SW of Siracusa (122291 inhabitants)
43 Km E of Modica (54633 inhabitants)
44 Km E of Ragusa (73313 inhabitants)
60 Km S of Catania (314555 inhabitants)
61 Km E of Vittoria (63339 inhabitants)
71 Km S of Acireale (52622 inhabitants)
87 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
Reviewed
Rev100 		ML 1.3 2021-12-21
21:29:29		 36.9727 15.2217 28 2021-12-21
21:35:03		 Sala Sismica INGV-Roma 98798501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-21 21:29:29 ± 0.12
Latitude 36.9727 ± 0.0036
Longitude 15.2217 ± 0.0079
Depth (km) 28 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98798501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 518
Semi-minor axis of confidence ellipse (meter) 489
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 85
Circular confidence region, given by single value of horizontal uncertainty (meter) 520.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 233
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.12051
Epicentral distance of station farthest from the epicenter (degree) 0.56657
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 98798501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-21 21:35:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CROCE.HHE. 2021-12-21T21:29:48.95 0.1 undecidable manual S 256 62.8926 108 -0.08 94
IV.HVIT.HHE. 2021-12-21T21:29:48.62 0.6 undecidable manual S 272 62.0934 108 -0.2 46
IV.HLNI.HHZ. 2021-12-21T21:29:45.84 0.6 undecidable manual S 324 51.9036 112 -0.42 44
IV.HCRL.HHZ. 2021-12-21T21:29:43.07 0.6 undecidable manual S 334 38.3283 120 0.08 50
IV.HMDC.HHE. 2021-12-21T21:29:43.28 0.6 undecidable manual S 268 38.9277 120 0.14 49
IV.HAGA.HHZ. 2021-12-21T21:29:42.07 0.6 undecidable manual S 350 35.1426 123 -0.21 47
IV.ISPIC.EHZ. 2021-12-21T21:29:42.43 0.6 undecidable manual S 233 35.4423 122 0.09 50
IV.HVIT.HHE. 2021-12-21T21:29:40.38 0.3 undecidable manual P 272 62.0934 108 -0.09 70
IV.SSY.HHZ. 2021-12-21T21:29:40.30 0.6 undecidable manual S 327 24.3534 134 0.29 49
IV.CROCE.HHE. 2021-12-21T21:29:40.53 0.1 undecidable manual P 256 62.8926 108 -0.06 94
IV.HVZN.HHZ. 2021-12-21T21:29:38.99 0.6 undecidable manual P 297 50.3163 113 0.22 47
IV.HSRS.HHZ. 2021-12-21T21:29:38.16 0.6 undecidable manual S 0 13.3755 151 -0.06 51
IV.HLNI.HHZ. 2021-12-21T21:29:38.70 0.6 negative manual P 324 51.9036 112 -0.3 45
IV.HCRL.HHZ. 2021-12-21T21:29:37.17 0.1 negative manual P 334 38.3283 120 0.06 100
IV.HMDC.HHE. 2021-12-21T21:29:37.24 0.1 undecidable manual P 268 38.9277 120 0.05 100
IV.HAGA.HHZ. 2021-12-21T21:29:36.70 0.6 undecidable manual P 350 35.1426 123 0 50
IV.ISPIC.EHZ. 2021-12-21T21:29:36.89 0.3 positive manual P 233 35.4423 122 0.16 74
IV.SSY.HHZ. 2021-12-21T21:29:35.49 0.3 negative manual P 327 24.3534 134 0.1 76
IV.HSRS.HHZ. 2021-12-21T21:29:34.43 0.6 positive manual P 0 13.3755 151 0.08 52
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSY.HHE. ML:1.9 0.0003055 0.58 AML other m 2021-12-21T21:29:41.09
IV.SSY.HHN. ML:2.1 0.000551 0.54 AML other m 2021-12-21T21:29:42.19
IV.HCRL.HHE. ML:1.8 0.000202 0.14 AML other m 2021-12-21T21:29:43.24
IV.HCRL.HHN. ML:1.5 0.00010095000000000001 1.38 AML other m 2021-12-21T21:29:43.23
IV.HSRS.HHE. ML:1.3 0.00010211648500000001 0.064 AML other m 2021-12-21T21:29:38.50
IV.HSRS.HHN. ML:1.1 0.000066208335 0.0768 AML other m 2021-12-21T21:29:38.52
IV.ISPIC.EHE. ML:1.2 0.000044756569999999996 0.1792 AML other m 2021-12-21T21:29:42.94
IV.ISPIC.EHN. ML:1.2 0.000054841155 0.2176 AML other m 2021-12-21T21:29:42.71
IV.HLNI.HHE. ML:1.1 0.000023048205 0.2432 AML other m 2021-12-21T21:29:46.01
IV.HLNI.HHN. ML:1.1 0.000024913415000000002 1.2544 AML other m 2021-12-21T21:29:45.86
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