Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 23-12-2021 and time 22:32:21 (UTC) in region 6 km SW Motta Sant'Anastasia (CT)

A magnitude ML 1.5 earthquake occured in region: 6 km SW Motta Sant'Anastasia (CT), on

  • 23-12-2021 22:32:21 (UTC)
  • 23-12-2021 23:32:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.4830, 14.9180 at 10 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 6 12116 12116
Misterbianco CT 9 49410 61526
Paternò CT 11 48228 109754
Camporotondo Etneo CT 12 5023 114777
Belpasso CT 13 28108 142885
San Pietro Clarenza CT 14 7743 150628
Santa Maria di Licodia CT 15 7641 158269
Catania CT 15 314555 472824
Gravina di Catania CT 16 25838 498662
Mascalucia CT 16 31958 530620
Ragalna CT 17 3924 534544
Sant'Agata li Battiati CT 17 9479 544023
Tremestieri Etneo CT 17 20589 564612
Nicolosi CT 18 7463 572075
Biancavilla CT 18 24007 596082
San Giovanni la Punta CT 19 23060 619142
San Gregorio di Catania CT 19 11966 631108
Pedara CT 20 14102 645210

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km W of Catania (314555 inhabitants)
26 Km SW of Acireale (52622 inhabitants)
58 Km NW of Siracusa (122291 inhabitants)
64 Km N of Ragusa (73313 inhabitants)
68 Km NE of Vittoria (63339 inhabitants)
71 Km N of Modica (54633 inhabitants)
75 Km NE of Gela (75827 inhabitants)
76 Km E of Caltanissetta (63360 inhabitants)
95 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 1.5 2021-12-23
22:32:21		 37.4833 14.9177 10 2022-03-30
13:04:42		 Bollettino Sismico Italiano INGV 102533611
Reviewed
Rev100 		ML 1.7 2021-12-23
22:32:21		 37.4798 14.8972 13 2021-12-23
22:43:23		 Sala Sismica INGV-Roma 98871591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-23 22:32:21 ± 0.07
Latitude 37.4833 ± 0.0027
Longitude 14.9177 ± 0.0091
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 102533611

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 759
Semi-minor axis of confidence ellipse (meter) 163
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 94
Circular confidence region, given by single value of horizontal uncertainty (meter) 760.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 39
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.13850
Epicentral distance of station farthest from the epicenter (degree) 0.90832
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 26
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 98871591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-23 22:43:23

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 28
Type of magnitude ML
Reference to an origin 102533611
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-29 15:10:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ISPIC.EHZ. 2021-12-23T22:32:45.75 0.1 undecidable manual S 181 77.9664 50 0.89 34
IV.HVIT.HHZ. 2021-12-23T22:32:41.16 0.1 undecidable manual S 213 64.6908 50 -0.16 44
IV.HMDC.HHZ. 2021-12-23T22:32:40.25 0.1 undecidable manual S 192 59.3961 50 0.36 43
IV.MSRU.HHZ. 2021-12-23T22:32:38.29 0.1 undecidable manual P 31 100.8213 50 -0.12 63
IV.MTTG.HHZ. 2021-12-23T22:32:36.97 0.1 undecidable manual P 50 89.6436 50 0.29 62
IV.SSY.HHZ. 2021-12-23T22:32:35.07 0.1 undecidable manual S 159 38.628 50 0.71 40
IV.MPNC.HHZ. 2021-12-23T22:32:35.28 0.1 undecidable manual P 27 82.8504 50 -0.36 62
IV.HVZN.HHZ. 2021-12-23T22:32:34.12 0.1 undecidable manual S 208 38.2284 50 -0.14 47
IV.ISPIC.EHZ. 2021-12-23T22:32:34.75 0.1 undecidable manual P 181 77.9664 50 -0.13 65
IV.ESCV.HHZ. 2021-12-23T22:32:33.05 0.1 undecidable manual S 343 30.6471 50 0.83 38
IV.HAGA.HHZ. 2021-12-23T22:32:32.45 0.1 undecidable manual S 136 30.3474 50 0.31 46
IV.HMDC.HHZ. 2021-12-23T22:32:32.03 0.1 undecidable manual P 192 59.3961 50 0.02 69
IV.HVIT.HHZ. 2021-12-23T22:32:32.56 0.1 undecidable manual P 213 64.6908 50 -0.28 43
IV.RAFF.HHZ. 2021-12-23T22:32:31.35 0.1 undecidable manual P 240 56.8986 50 -0.28 88
IV.AIO.HHZ. 2021-12-23T22:32:31.85 0.1 undecidable manual P 27 60.7947 50 -0.38 64
IV.EMPL.HHZ. 2021-12-23T22:32:30.43 0.1 undecidable manual S 12 22.1556 113 0.78 40
IV.HSRS.HNN. 2021-12-23T22:32:30.37 0.1 undecidable manual P 148 51.0156 50 -0.35 66
IV.ESPC.HHN. 2021-12-23T22:32:30.26 0.1 undecidable manual S 23 25.1526 111 -0.34 46
IV.ESLN.HHZ. 2021-12-23T22:32:30.70 0.1 undecidable manual S 12 23.8539 112 0.53 44
IT.LNT.HGZ. 2021-12-23T22:32:30.06 0.1 undecidable manual S 161 22.8549 113 0.2 48
IV.EPZF.HHZ. 2021-12-23T22:32:29.15 0.1 undecidable manual P 352 38.1285 50 0.4 66
IV.SSY.HHZ. 2021-12-23T22:32:28.71 0.1 undecidable manual P 159 38.628 50 -0.11 94
IV.EPOZ.HHZ. 2021-12-23T22:32:28.03 0.1 undecidable manual P 49 31.746 50 0.28 92
IV.GALF.HHZ. 2021-12-23T22:32:28.92 0.1 undecidable manual P 309 39.8268 50 -0.09 71
IV.HLNI.HHZ. 2021-12-23T22:32:28.05 0.1 undecidable manual S 195 15.4734 122 0.47 46
IV.HVZN.HHZ. 2021-12-23T22:32:28.48 0.1 undecidable manual P 208 38.2284 50 -0.28 68
IV.ESVO.HHE. 2021-12-23T22:32:28.16 0.1 undecidable manual P 5 32.2455 50 0.32 68
IV.ESCV.HHZ. 2021-12-23T22:32:27.56 0.1 undecidable manual P 343 30.6471 50 -0.02 73
IV.ECBD.HHN. 2021-12-23T22:32:27.55 0.1 undecidable manual P 24 36.1416 50 -0.89 56
IV.ECZM.HHN. 2021-12-23T22:32:27.28 0.1 undecidable manual P 358 27.5502 109 0.18 71
IV.ESML.HHZ. 2021-12-23T22:32:27.46 0.1 undecidable manual S 347 15.3735 122 -0.07 49
IV.HAGA.HHZ. 2021-12-23T22:32:27.28 0.1 undecidable manual P 136 30.3474 50 -0.26 69
IV.ESLN.HHZ. 2021-12-23T22:32:26.28 0.1 undecidable manual P 12 23.8539 112 -0.12 96
IT.LNT.HGZ. 2021-12-23T22:32:26.09 0.1 undecidable manual P 161 22.8549 113 -0.13 96
IV.EMPL.HHZ. 2021-12-23T22:32:26.22 0.1 undecidable manual P 12 22.1556 113 0.12 73
IV.ECHR.HHE. 2021-12-23T22:32:26.16 0.1 undecidable manual P 359 22.5552 113 -0.01 74
IV.ESPC.HHN. 2021-12-23T22:32:26.18 0.1 undecidable manual P 23 25.1526 111 -0.47 89
IV.ESML.HHZ. 2021-12-23T22:32:25.07 0.1 undecidable manual P 347 15.3735 122 0.19 73
IV.HLNI.HHZ. 2021-12-23T22:32:24.94 0.1 undecidable manual P 195 15.4734 122 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESML.HHE. ML:1.3 0.0001797685 0.128 AML other m 2021-12-23T22:32:28.00
IV.ESML.HHN. ML:1.3 0.00017555619 0.128 AML other m 2021-12-23T22:32:28.81
IV.EMPL.HHN. ML:2.2 0.0010084999999999998 1.78 AML other m 2021-12-23T22:32:31.03
IV.EMPL.HHE. ML:2.0 0.000735 0.4 AML other m 2021-12-23T22:32:33.21
IV.ESCV.HHE. ML:1.6 0.0002115 0.28 AML other m 2021-12-23T22:32:34.34
IV.ESCV.HHN. ML:1.6 0.00020998935 0.2688 AML other m 2021-12-23T22:32:36.84
IV.GALF.HHE. ML:1.5 0.0001155 0.36 AML other m 2021-12-23T22:32:36.40
IV.SSY.HHN. ML:2.2 0.00056530105 0.2176 AML other m 2021-12-23T22:32:38.30
IV.GALF.HHN. ML:1.5 0.00011764700000000001 0.4864 AML other m 2021-12-23T22:32:38.48
IV.HVZN.HHN. ML:1.5 0.0001249853 0.4608 AML other m 2021-12-23T22:32:42.39
IV.HVZN.HHE. ML:1.5 0.00012565 0.32 AML other m 2021-12-23T22:32:39.38
IV.SSY.HHE. ML:1.7 0.00020071842000000001 0.2048 AML other m 2021-12-23T22:32:35.26
IV.HMDC.HHN. ML:1.5 0.00006131666 0.2688 AML other m 2021-12-23T22:32:41.08
IV.HMDC.HHE. ML:1.5 0.00006093377 0.1664 AML other m 2021-12-23T22:32:41.80
IV.ESML.HNE. ML:1.2 0.000143795125 0.1664 AML other m 2021-12-23T22:32:28.85
IV.ESML.HNN. ML:1.2 0.00015232903 0.1408 AML other m 2021-12-23T22:32:28.81
IV.HAGA.HHE. ML:1.1 0.00006103075 0.1408 AML other m 2021-12-23T22:32:32.77
IV.HAGA.HHN. ML:1.0 0.000049828015000000006 0.1408 AML other m 2021-12-23T22:32:32.54
IV.EPOZ.HHN. ML:1.3 0.00009080941 0.448 AML other m 2021-12-23T22:32:38.25
IV.EPOZ.HHE. ML:1.3 0.00010139015 0.0896 AML other m 2021-12-23T22:32:28.77
IV.SSY.HNN. ML:1.6 0.00014553768 0.2816 AML other m 2021-12-23T22:32:38.42
IV.SSY.HNE. ML:1.6 0.000149822 0.2176 AML other m 2021-12-23T22:32:38.30
IV.GALF.HNE. ML:1.5 0.00011996585 0.8704 AML other m 2021-12-23T22:32:36.92
IV.AIO.HHE. ML:1.1 0.000024309615 0.2176 AML other m 2021-12-23T22:32:41.64
IV.AIO.HHN. ML:0.9 0.00001648351 0.2816 AML other m 2021-12-23T22:32:43.14
IV.ISPIC.EHN. ML:1.8 0.00008196098000000001 0.1408 AML other m 2021-12-23T22:32:45.93
IV.ISPIC.EHE. ML:1.8 0.00009889902 0.2816 AML other m 2021-12-23T22:32:46.44
IV.MPNC.HHN. ML:1.4 0.000028849005 0.5248 AML other m 2021-12-23T22:32:48.98
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