Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 23-12-2021 and time 22:34:39 (UTC) in region 5 km SW Motta Sant'Anastasia (CT)

A magnitude ML 1.8 earthquake occured in region: 5 km SW Motta Sant'Anastasia (CT), on

  • 23-12-2021 22:34:39 (UTC)
  • 23-12-2021 23:34:39 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.4780, 14.9340 at 9 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
Motta Sant'Anastasia CT 5 12116 12116
Misterbianco CT 8 49410 61526
Paternò CT 11 48228 109754
Camporotondo Etneo CT 12 5023 114777
San Pietro Clarenza CT 13 7743 122520
Belpasso CT 13 28108 150628
Catania CT 14 314555 465183
Gravina di Catania CT 15 25838 491021
Mascalucia CT 15 31958 522979
Sant'Agata li Battiati CT 16 9479 532458
Santa Maria di Licodia CT 16 7641 540099
Tremestieri Etneo CT 16 20589 560688
Ragalna CT 17 3924 564612
Nicolosi CT 17 7463 572075
San Giovanni la Punta CT 18 23060 595135
San Gregorio di Catania CT 18 11966 607101
Biancavilla CT 19 24007 631108
Pedara CT 19 14102 645210

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km W of Catania (314555 inhabitants)
25 Km SW of Acireale (52622 inhabitants)
56 Km NW of Siracusa (122291 inhabitants)
64 Km N of Ragusa (73313 inhabitants)
68 Km NE of Vittoria (63339 inhabitants)
70 Km N of Modica (54633 inhabitants)
76 Km NE of Gela (75827 inhabitants)
77 Km E of Caltanissetta (63360 inhabitants)
94 Km SW of Reggio di Calabria (183035 inhabitants)
97 Km SW of Messina (238439 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 1.8 2021-12-23
22:34:39		 37.4783 14.9343 9 2022-03-30
13:04:42		 Bollettino Sismico Italiano INGV 102533901
Reviewed
Rev100 		ML 1.8 2021-12-23
22:34:40		 37.4737 14.9458 8 2021-12-23
22:47:03		 Sala Sismica INGV-Roma 98871931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-23 22:34:39 ± 0.07
Latitude 37.4783 ± 0.0036
Longitude 14.9343 ± 0.0091
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 102533901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 812
Semi-minor axis of confidence ellipse (meter) 176
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 88
Circular confidence region, given by single value of horizontal uncertainty (meter) 810.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 48
Number of defining phases 48
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.13850
Epicentral distance of station farthest from the epicenter (degree) 0.90652
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 30
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 102533901
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-29 15:27:32

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 98871931
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-23 22:47:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ISPIC.EHZ. 2021-12-23T22:35:03.87 0.1 undecidable manual S 182 77.4669 50 0.95 34
IV.MUCR.HHE. 2021-12-23T22:35:00.11 0.1 undecidable manual S 355 62.8926 50 1.1 32
IV.HVIT.HHZ. 2021-12-23T22:34:59.27 0.1 undecidable manual S 214 65.0904 50 -0.33 43
IV.AIO.HHE. 2021-12-23T22:34:58.72 0.1 undecidable manual S 26 60.5949 50 0.3 44
IV.RAFF.HHZ. 2021-12-23T22:34:58.66 0.1 undecidable manual S 241 57.8976 50 0.97 35
IV.MSRU.HHZ. 2021-12-23T22:34:56.17 0.1 undecidable manual P 30 100.6215 50 -0.36 60
IV.HSRS.HHZ. 2021-12-23T22:34:55.96 0.1 undecidable manual S 149 49.7169 50 0.45 43
IV.SSY.HHZ. 2021-12-23T22:34:53.28 0.1 undecidable manual S 161 37.629 50 1 35
IV.EPZF.HHZ. 2021-12-23T22:34:53.76 0.1 undecidable manual S 350 38.9277 50 1.13 33
IV.ISPIC.EHZ. 2021-12-23T22:34:52.74 0.1 undecidable manual P 182 77.4669 50 -0.22 65
IV.HVZN.HHZ. 2021-12-23T22:34:52.40 0.1 undecidable manual S 210 38.4282 50 -0.11 47
IV.MCPD.HHZ. 2021-12-23T22:34:52.28 0.1 undecidable manual P 346 73.371 50 -0.05 67
IV.ESCV.HHZ. 2021-12-23T22:34:51.25 0.1 undecidable manual S 341 31.5462 50 0.58 43
IV.MSFR.HHZ. 2021-12-23T22:34:51.73 0.1 undecidable manual P 334 68.5758 50 0.13 67
IV.HVIT.HHZ. 2021-12-23T22:34:50.34 0.1 undecidable manual P 214 65.0904 50 -0.71 57
IV.MUCR.HHE. 2021-12-23T22:34:50.48 0.1 undecidable manual P 355 62.8926 50 -0.24 66
IV.ECZM.HHN. 2021-12-23T22:34:50.26 0.1 undecidable manual S 355 28.1496 108 0.59 43
IV.HAGA.HHZ. 2021-12-23T22:34:50.50 0.1 undecidable manual S 138 28.9488 108 0.57 43
IV.RAFF.HHZ. 2021-12-23T22:34:49.44 0.1 undecidable manual P 241 57.8976 50 -0.51 84
IV.HMDC.HHZ. 2021-12-23T22:34:49.74 0.1 undecidable manual P 193 59.0964 50 -0.4 64
MN.VAE.HHZ. 2021-12-23T22:34:49.13 0.1 undecidable manual P 269 51.1155 50 0.22 45
IV.AIO.HHE. 2021-12-23T22:34:49.81 0.1 undecidable manual P 26 60.5949 50 -0.56 82
IT.LNT.HGZ. 2021-12-23T22:34:48.12 0.1 undecidable manual S 164 21.867 113 0.49 45
IV.ESPC.HHN. 2021-12-23T22:34:48.19 0.1 undecidable manual S 19 25.1526 110 -0.48 45
IV.EMPL.HHZ. 2021-12-23T22:34:48.69 0.1 undecidable manual S 8 22.4553 112 0.88 58
IV.HSRS.HHZ. 2021-12-23T22:34:48.39 0.1 undecidable manual P 149 49.7169 50 -0.3 67
IV.ESLN.HHZ. 2021-12-23T22:34:48.67 0.1 undecidable manual S 8 24.1536 111 0.34 46
IV.GALF.HHZ. 2021-12-23T22:34:47.26 0.1 undecidable manual P 309 41.3253 50 -0.14 70
IV.EPZF.HHZ. 2021-12-23T22:34:47.36 0.1 undecidable manual P 350 38.9277 50 0.33 90
IV.SSY.HHZ. 2021-12-23T22:34:46.80 0.1 undecidable manual P 161 37.629 50 -0.03 96
IV.ESVO.HHE. 2021-12-23T22:34:46.31 0.1 undecidable manual P 2 32.745 50 0.25 70
IV.HLNI.HHZ. 2021-12-23T22:34:46.06 0.1 undecidable manual S 201 15.3735 121 0.45 46
IV.HVZN.HHZ. 2021-12-23T22:34:46.72 0.1 undecidable manual P 210 38.4282 50 -0.24 69
IV.EPOZ.HHZ. 2021-12-23T22:34:46.19 0.1 positive manual P 46 30.9468 50 0.38 91
IV.ECZM.HHN. 2021-12-23T22:34:45.30 0.1 undecidable manual P 355 28.1496 108 -0.02 98
IV.ESML.HHZ. 2021-12-23T22:34:45.90 0.1 undecidable manual S 343 16.2726 120 0.04 100
IV.HAGA.HHZ. 2021-12-23T22:34:45.34 0.1 undecidable manual P 138 28.9488 108 -0.12 96
IV.ESCV.HHZ. 2021-12-23T22:34:45.76 0.1 undecidable manual P 341 31.5462 50 -0.14 72
IV.ECBD.HHN. 2021-12-23T22:34:45.64 0.1 undecidable manual P 22 36.0417 50 -0.94 55
IV.ESPC.HHN. 2021-12-23T22:34:44.36 0.1 undecidable manual P 19 25.1526 110 -0.38 92
IV.ECHR.HHE. 2021-12-23T22:34:44.20 0.1 undecidable manual P 355 23.1546 112 -0.17 72
IV.EMPL.HHZ. 2021-12-23T22:34:44.33 0.1 undecidable manual P 8 22.4553 112 0.08 98
IV.ESLN.HHZ. 2021-12-23T22:34:44.59 0.1 undecidable manual P 8 24.1536 111 0.04 99
IV.EMFS.HHE. 2021-12-23T22:34:44.66 0.1 undecidable manual P 12 27.3504 109 -0.5 67
IT.LNT.HGZ. 2021-12-23T22:34:44.18 0.1 undecidable manual P 164 21.867 113 0.04 99
IV.EMFO.HHE. 2021-12-23T22:34:44.93 0.1 undecidable manual P 26 31.6461 50 -0.98 54
IV.HLNI.HHZ. 2021-12-23T22:34:43.03 0.1 negative manual P 201 15.3735 121 0.05 100
IV.ESML.HHZ. 2021-12-23T22:34:42.89 0.1 undecidable manual P 343 16.2726 120 -0.23 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESML.HHN. ML:1.6 0.00034050000000000004 0.66 AML other m 2021-12-23T22:34:46.54
IV.HLNI.HHE. ML:2.0 0.0008625000000000001 0.8 AML other m 2021-12-23T22:34:46.32
IV.HLNI.HHN. ML:1.8 0.0006594999999999999 0.48 AML other m 2021-12-23T22:34:46.74
IV.ESML.HNN. ML:1.5 0.000292 0.42 AML other m 2021-12-23T22:34:47.33
IV.ESML.HHE. ML:1.6 0.000359 0.14 AML other m 2021-12-23T22:34:48.86
IV.ESML.HNE. ML:1.5 0.0003135 0.16 AML other m 2021-12-23T22:34:48.87
IV.EMPL.HHN. ML:2.4 0.001885 0.26 AML other m 2021-12-23T22:34:49.20
IV.HAGA.HHN. ML:1.6 0.00020400000000000003 0.96 AML other m 2021-12-23T22:34:50.64
IV.HAGA.HHE. ML:1.7 0.0002475 0.62 AML other m 2021-12-23T22:34:50.58
IV.EMPL.HHE. ML:2.3 0.0012250000000000002 0.3 AML other m 2021-12-23T22:34:51.71
IV.ESCV.HHE. ML:1.9 0.0003905 1.32 AML other m 2021-12-23T22:34:52.67
IV.EPOZ.HHN. ML:1.6 0.00016399999999999997 1.2 AML other m 2021-12-23T22:34:53.89
IV.EPOZ.HHE. ML:1.6 0.000191 0.54 AML other m 2021-12-23T22:34:54.72
IV.ESCV.HHN. ML:2.0 0.0004055 1 AML other m 2021-12-23T22:34:54.01
IV.GALF.HHE. ML:1.8 0.0001915 0.32 AML other m 2021-12-23T22:34:54.58
IV.GALF.HHN. ML:1.8 0.0002075 0.3 AML other m 2021-12-23T22:34:55.22
IV.EPZF.HHE. ML:1.9 0.0003 0.3 AML other m 2021-12-23T22:34:55.26
IV.EPZF.HHN. ML:1.7 0.000187 0.3 AML other m 2021-12-23T22:34:55.46
IV.SSY.HHN. ML:2.4 0.0009355 0.18 AML other m 2021-12-23T22:34:56.51
IV.SSY.HHE. ML:2.0 0.0003655 0.52 AML other m 2021-12-23T22:34:57.31
IV.HVZN.HHE. ML:1.9 0.0003055 0.34 AML other m 2021-12-23T22:34:57.62
IV.HVZN.HHN. ML:1.8 0.000256 1.58 AML other m 2021-12-23T22:34:58.04
IV.HVIT.HHN. ML:1.6 0.0000766 0.84 AML other m 2021-12-23T22:35:01.69
IV.HVIT.HHE. ML:1.6 0.00006815 0.92 AML other m 2021-12-23T22:35:01.40
IV.MCPD.HHE. ML:1.4 0.00003455 0.48 AML other m 2021-12-23T22:35:02.72
IV.MCPD.HHN. ML:1.4 0.0000326 0.74 AML other m 2021-12-23T22:35:03.81
IV.ISPIC.EHN. ML:2.0 0.00013350000000000002 0.56 AML other m 2021-12-23T22:35:04.10
IV.ISPIC.EHE. ML:2.0 0.000148 1.02 AML other m 2021-12-23T22:35:04.02
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