Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 24-12-2021 and time 04:42:31 (UTC) in region 4 km N Scordia (CT)

A magnitude ML 1.7 earthquake occured in region: 4 km N Scordia (CT), on

  • 24-12-2021 04:42:31 (UTC)
  • 24-12-2021 05:42:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.3360, 14.8470 at 11 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
Scordia CT 4 17095 17095
Militello in Val di Catania CT 8 7443 24538
Palagonia CT 9 16608 41146
Francofonte SR 12 12800 53946
Ramacca CT 15 10894 64840
Lentini SR 15 24085 88925
Mineo CT 16 5159 94084
Carlentini SR 16 17798 111882

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SW of Catania (314555 inhabitants)
42 Km SW of Acireale (52622 inhabitants)
47 Km N of Ragusa (73313 inhabitants)
50 Km NW of Siracusa (122291 inhabitants)
51 Km NE of Vittoria (63339 inhabitants)
54 Km N of Modica (54633 inhabitants)
61 Km NE of Gela (75827 inhabitants)
71 Km E of Caltanissetta (63360 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 1.7 2021-12-24
04:42:31		 37.3363 14.8468 11 2022-03-30
13:04:24		 Bollettino Sismico Italiano INGV 99058751
Reviewed
Rev100 		ML 1.8 2021-12-24
04:42:30		 37.3505 14.8583 15 2021-12-24
04:46:59		 Sala Sismica INGV-Roma 98886701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-24 04:42:31 ± 0.1
Latitude 37.3363 ± 0.0045
Longitude 14.8468 ± 0.0079
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99058751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 636
Semi-minor axis of confidence ellipse (meter) 252
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 103
Circular confidence region, given by single value of horizontal uncertainty (meter) 640.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 75
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 38
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.02338
Epicentral distance of station farthest from the epicenter (degree) 1.06390
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 22
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 98886701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-24 04:46:59

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 27
Type of magnitude ML
Reference to an origin 99058751
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-15 16:23:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MSRU.HHZ. 2021-12-24T04:43:05.92 0.6 undecidable manual S 29 118.0929 50 0.7 34
IV.ISPIC.EHZ. 2021-12-24T04:42:51.19 0.6 undecidable manual S 175 61.8936 50 0.97 33
IV.MSRU.HHZ. 2021-12-24T04:42:50.54 0.1 undecidable manual P 29 118.0929 50 -0.3 76
IV.RAFF.HHZ. 2021-12-24T04:42:46.38 0.6 undecidable manual S 254 44.622 50 0.78 38
IV.EVRN.HHZ. 2021-12-24T04:42:46.12 0.3 undecidable manual S 33 46.62 50 -0.04 69
IV.ESCV.HHN. 2021-12-24T04:42:46.04 0.3 undecidable manual S 357 45.621 50 0.16 68
IV.HVIT.HHZ. 2021-12-24T04:42:46.70 0.6 undecidable manual S 217 47.7189 50 0.25 44
IV.HMDC.HHZ. 2021-12-24T04:42:45.38 0.6 undecidable manual S 188 42.2244 50 0.41 43
IV.HSRS.HHZ. 2021-12-24T04:42:45.29 0.6 undecidable manual S 129 42.7239 50 0.18 45
IV.ESLN.HHZ. 2021-12-24T04:42:44.85 0.6 undecidable manual S 16 41.1255 50 0.16 45
IV.ESPC.HHN. 2021-12-24T04:42:44.54 0.6 undecidable manual S 22 42.5241 50 -0.52 42
IV.EMPL.HHZ. 2021-12-24T04:42:44.89 0.6 undecidable manual S 16 39.5271 50 0.64 40
IV.ISPIC.EHZ. 2021-12-24T04:42:42.10 0.1 undecidable manual P 175 61.8936 50 -0.08 89
IV.SSY.HHZ. 2021-12-24T04:42:42.06 0.6 undecidable manual S 135 28.1496 50 0.84 38
IV.EPIT.HHZ. 2021-12-24T04:42:41.68 0.6 undecidable manual P 19 55.7997 50 0.44 42
IV.GALF.HHZ. 2021-12-24T04:42:40.13 0.1 positive manual P 329 48.3183 50 0.05 92
IV.HAGA.HHZ. 2021-12-24T04:42:40.97 0.6 undecidable manual S 102 27.75 50 -0.14 47
IV.EPOZ.HHZ. 2021-12-24T04:42:40.15 0.1 undecidable manual P 39 47.8188 50 0.14 90
IV.ECZM.HHN. 2021-12-24T04:42:40.21 0.6 undecidable manual P 7 44.1225 50 0.77 38
IV.EVRN.HHZ. 2021-12-24T04:42:39.69 0.3 undecidable manual P 33 46.62 50 -0.14 68
IV.ESCV.HHN. 2021-12-24T04:42:39.89 0.1 undecidable manual P 357 45.621 50 0.22 89
IV.EMFS.HHE. 2021-12-24T04:42:39.54 0.6 undecidable manual P 17 44.5221 50 0.03 46
IV.HVIT.HHZ. 2021-12-24T04:42:39.48 0.1 negative manual P 217 47.7189 50 -0.52 83
IV.ECHR.HHE. 2021-12-24T04:42:39.68 0.6 undecidable manual P 8 39.2274 50 0.99 35
IV.RAFF.HHZ. 2021-12-24T04:42:39.23 0.1 positive manual P 254 44.622 50 -0.28 88
IV.HVZN.HHZ. 2021-12-24T04:42:39.74 0.6 undecidable manual S 214 21.0678 50 0.43 44
IV.HMDC.HHZ. 2021-12-24T04:42:38.76 0.1 undecidable manual P 188 42.2244 50 -0.39 86
IV.EMPL.HHZ. 2021-12-24T04:42:38.46 0.3 undecidable manual P 16 39.5271 50 -0.27 67
IV.ESPC.HHN. 2021-12-24T04:42:38.46 0.1 undecidable manual P 22 42.5241 50 -0.74 77
IV.ESLN.HHZ. 2021-12-24T04:42:38.73 0.1 negative manual P 16 41.1255 50 -0.25 89
IV.HSRS.HHZ. 2021-12-24T04:42:38.85 0.1 undecidable manual P 129 42.7239 50 -0.38 86
IT.LNT.HGZ. 2021-12-24T04:42:38.05 0.3 undecidable manual S 111 14.6742 126 0.51 66
IV.HAGA.HHZ. 2021-12-24T04:42:36.45 0.1 undecidable manual P 102 27.75 50 -0.47 87
IV.SSY.HHZ. 2021-12-24T04:42:36.95 0.1 negative manual P 135 28.1496 50 -0.04 95
IV.HLNI.HHZ. 2021-12-24T04:42:35.57 0.6 undecidable manual S 59 2.5974 167 0.49 45
IV.HVZN.HHZ. 2021-12-24T04:42:35.61 0.1 positive manual P 214 21.0678 50 -0.27 92
IT.LNT.HGZ. 2021-12-24T04:42:34.70 0.1 undecidable manual P 111 14.6742 126 -0.16 95
IV.HLNI.HHZ. 2021-12-24T04:42:33.42 0.1 negative manual P 59 2.5974 167 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HLNI.HHN. ML:1.4 0.00047247850000000003 0.2592 AML other m 2021-12-24T04:42:35.77
IV.HLNI.HHE. ML:1.6 0.00071278875 0.0992 AML other m 2021-12-24T04:42:35.82
IV.HVZN.HHN. ML:1.6 0.00031242959999999996 0.3776 AML other m 2021-12-24T04:42:40.43
IV.HVZN.HHE. ML:1.6 0.0002674254 0.4 AML other m 2021-12-24T04:42:40.25
IV.HAGA.HHN. ML:1.5 0.00016647304999999998 0.1408 AML other m 2021-12-24T04:42:41.16
IV.HAGA.HHE. ML:1.5 0.000159642265 0.1408 AML other m 2021-12-24T04:42:41.17
IV.SSY.HHN. ML:2.0 0.0005788470500000001 0.0992 AML other m 2021-12-24T04:42:42.18
IV.SSY.HNE. ML:1.6 0.0001931411 0.1088 AML other m 2021-12-24T04:42:42.19
IV.SSY.HNN. ML:1.4 0.00014546885 0.2112 AML other m 2021-12-24T04:42:42.38
IV.SSY.HHE. ML:1.8 0.00031201585 0.1184 AML other m 2021-12-24T04:42:42.47
IV.EMPL.HHN. ML:2.1 0.00042587885000000005 0.16 AML other m 2021-12-24T04:42:45.34
IV.HSRS.HHN. ML:1.2 0.00004855974 0.8 AML other m 2021-12-24T04:42:45.42
IV.HMDC.HHE. ML:1.4 0.00008371931 0.4224 AML other m 2021-12-24T04:42:45.68
IV.HMDC.HHN. ML:1.3 0.00006745438000000001 0.4192 AML other m 2021-12-24T04:42:45.68
IV.HMDC.HNE. ML:1.6 0.00013046836 0.3328 AML other m 2021-12-24T04:42:46.20
IV.EVRN.HHE. ML:1.6 0.00012626209999999998 0.88 AML other m 2021-12-24T04:42:46.76
IV.EVRN.HNN. ML:1.8 0.0001966068 0.1696 AML other m 2021-12-24T04:42:46.60
IV.EVRN.HHN. ML:1.8 0.00019103655 0.6016 AML other m 2021-12-24T04:42:46.61
IV.GALF.HHE. ML:1.3 0.0000584 0.64 AML other m 2021-12-24T04:42:47.43
IV.GALF.HHN. ML:1.1 0.00003596842 0.3776 AML other m 2021-12-24T04:42:47.60
IV.GALF.HNN. ML:1.7 0.00014037035 1.0912 AML other m 2021-12-24T04:42:47.55
IV.ISPIC.EHE. ML:2.0 0.00018213325000000002 0.3008 AML other m 2021-12-24T04:42:51.45
IV.ISPIC.HNE. ML:2.2 0.00030164745 0.6304 AML other m 2021-12-24T04:42:51.61
IV.ISPIC.HNN. ML:2.0 0.00019030274999999998 0.5216 AML other m 2021-12-24T04:42:51.50
IV.ISPIC.EHN. ML:1.9 0.00015310735 0.1984 AML other m 2021-12-24T04:42:51.67
IV.MSRU.HHN. ML:1.6 0.00003234967 0.4832 AML other m 2021-12-24T04:43:06.22
IV.MSRU.HHE. ML:1.7 0.000035842825000000004 0.72 AML other m 2021-12-24T04:43:06.89
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