Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 24-12-2021 and time 01:16:13 (UTC) in region 10 km NE Avola (SR)

A magnitude ML 1.6 earthquake occured in region: 10 km NE Avola (SR), on

  • 24-12-2021 01:16:13 (UTC)
  • 24-12-2021 02:16:13 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 36.9830, 15.2090 at 29 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 11 31708 31708
Siracusa SR 12 122291 153999
Floridia SR 12 22762 176761
Canicattini Bagni SR 14 7109 183870
Solarino SR 16 8091 191961
Noto SR 16 23913 215874
Priolo Gargallo SR 20 12091 227965

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km SW of Siracusa (122291 inhabitants)
42 Km E of Modica (54633 inhabitants)
43 Km E of Ragusa (73313 inhabitants)
59 Km S of Catania (314555 inhabitants)
60 Km E of Vittoria (63339 inhabitants)
70 Km S of Acireale (52622 inhabitants)
86 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 2021-12-24
01:16:13		 36.9832 15.2093 29 2022-03-30
13:04:24		 Bollettino Sismico Italiano INGV 99052781
Reviewed
Rev100 		ML 1.7 2021-12-24
01:16:13		 36.9823 15.2137 30 2021-12-24
01:21:34		 Sala Sismica INGV-Roma 98879431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-24 01:16:13 ± 0.16
Latitude 36.9832 ± 0.0045
Longitude 15.2093 ± 0.0079
Depth (km) 29 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99052781

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 607
Semi-minor axis of confidence ellipse (meter) 423
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 302
Circular confidence region, given by single value of horizontal uncertainty (meter) 610.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 225
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
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) 0.10972
Epicentral distance of station farthest from the epicenter (degree) 0.56028
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 19
Type of magnitude ML
Reference to an origin 99052781
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-15 15:38:00

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 98879431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-24 01:21:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CROCE.HHZ. 2021-12-24T01:16:32.93 0.6 undecidable manual S 255 62.1933 109 -0.47 42
IV.HVZN.HHZ. 2021-12-24T01:16:30.63 0.6 undecidable manual S 296 48.8178 115 0.54 41
IV.HLNI.HHZ. 2021-12-24T01:16:30.28 0.6 undecidable manual S 324 50.3163 114 -0.19 45
IT.LNT.HGZ. 2021-12-24T01:16:27.67 0.3 undecidable manual S 332 38.5281 121 0 72
IV.HMDC.HHZ. 2021-12-24T01:16:27.70 0.6 undecidable manual S 266 37.8288 122 0.17 46
IV.HAGA.HHZ. 2021-12-24T01:16:26.46 0.6 undecidable manual S 352 33.8439 125 -0.17 46
IV.ISPIC.EHZ. 2021-12-24T01:16:26.73 0.6 undecidable manual S 230 35.2425 124 -0.21 46
IV.SSY.HHZ. 2021-12-24T01:16:24.58 0.6 undecidable manual S 328 22.755 138 0.17 48
IV.CROCE.HHZ. 2021-12-24T01:16:24.94 0.1 undecidable manual P 255 62.1933 109 -0.07 91
IV.HVZN.HHZ. 2021-12-24T01:16:23.28 0.1 positive manual P 296 48.8178 115 0.18 90
IV.HLNI.HHZ. 2021-12-24T01:16:23.16 0.1 negative manual P 324 50.3163 114 -0.16 91
IV.HSRS.HHZ. 2021-12-24T01:16:22.64 0.6 undecidable manual S 5 12.1767 155 -0.18 48
IV.ISPIC.EHZ. 2021-12-24T01:16:21.32 0.1 positive manual P 230 35.2425 124 0.04 95
IT.LNT.HGZ. 2021-12-24T01:16:21.71 0.3 undecidable manual P 332 38.5281 121 0.01 72
IV.HMDC.HHZ. 2021-12-24T01:16:21.71 0.1 negative manual P 266 37.8288 122 0.09 94
IV.HAGA.HHZ. 2021-12-24T01:16:21.08 0.1 undecidable manual P 352 33.8439 125 -0.02 96
IV.SSY.HHZ. 2021-12-24T01:16:19.95 0.1 negative manual P 328 22.755 138 0.13 96
IV.HSRS.HHZ. 2021-12-24T01:16:18.91 0.1 positive manual P 5 12.1767 155 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HSRS.HHN. ML:1.5 0.0001584579 0.34 AML other m 2021-12-24T01:16:22.73
IV.HSRS.HHE. ML:1.6 0.00018241075000000002 0.2 AML other m 2021-12-24T01:16:22.94
IV.SSY.HNN. ML:1.5 0.00012348932499999999 0.34 AML other m 2021-12-24T01:16:24.67
IV.SSY.HNE. ML:1.7 0.00021375395000000004 0.08 AML other m 2021-12-24T01:16:24.85
IV.SSY.HHE. ML:2.0 0.00045589455 0.08 AML other m 2021-12-24T01:16:24.82
IV.SSY.HHN. ML:2.1 0.00049221965 0.08 AML other m 2021-12-24T01:16:24.84
IV.ISPIC.HNN. ML:1.7 0.00014486854999999998 0.6504 AML other m 2021-12-24T01:16:27.29
IV.ISPIC.EHN. ML:1.5 0.000097507915 0.22 AML other m 2021-12-24T01:16:27.08
IV.ISPIC.EHE. ML:1.5 0.000088290865 0.14 AML other m 2021-12-24T01:16:27.08
IV.HMDC.HHN. ML:1.9 0.00022542645 0.24 AML other m 2021-12-24T01:16:27.95
IV.HMDC.HNN. ML:1.9 0.00021206749999999998 0.24 AML other m 2021-12-24T01:16:27.96
IV.HMDC.HHE. ML:1.8 0.00017199999999999998 0.1 AML other m 2021-12-24T01:16:27.85
IV.HLNI.HHE. ML:1.4 0.000051209649999999995 0.26 AML other m 2021-12-24T01:16:30.36
IV.HLNI.HHN. ML:1.3 0.000045246509999999995 0.22 AML other m 2021-12-24T01:16:30.54
IV.HVZN.HHE. ML:1.5 0.00007025858 0.4 AML other m 2021-12-24T01:16:31.24
IV.HVZN.HHN. ML:1.6 0.00007869669 0.18 AML other m 2021-12-24T01:16:31.59
IV.CROCE.HHE. ML:1.4 0.00003794128500000001 0.38 AML other m 2021-12-24T01:16:33.45
IV.CROCE.HNN. ML:1.9 0.00012558895000000002 0.3904 AML other m 2021-12-24T01:16:33.69
IV.CROCE.HHN. ML:1.5 0.00006113383500000001 0.36 AML other m 2021-12-24T01:16:33.69
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