Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 23-12-2021 and time 21:40:14 (UTC) in region 6 km SW Motta Sant'Anastasia (CT)

A magnitude ML 1.6 earthquake occured in region: 6 km SW Motta Sant'Anastasia (CT), on

  • 23-12-2021 21:40:14 (UTC)
  • 23-12-2021 22:40:14 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.4760, 14.9210 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 6 12116 12116
Misterbianco CT 9 49410 61526
Paternò CT 12 48228 109754
Camporotondo Etneo CT 13 5023 114777
Belpasso CT 14 28108 142885
San Pietro Clarenza CT 14 7743 150628
Catania CT 15 314555 465183
Gravina di Catania CT 16 25838 491021
Mascalucia CT 16 31958 522979
Santa Maria di Licodia CT 16 7641 530620
Sant'Agata li Battiati CT 17 9479 540099
Ragalna CT 17 3924 544023
Tremestieri Etneo CT 18 20589 564612
Nicolosi CT 18 7463 572075
Biancavilla CT 19 24007 596082
San Giovanni la Punta CT 19 23060 619142
San Gregorio di Catania CT 19 11966 631108

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km W of Catania (314555 inhabitants)
27 Km SW of Acireale (52622 inhabitants)
57 Km NW of Siracusa (122291 inhabitants)
63 Km N of Ragusa (73313 inhabitants)
68 Km NE of Vittoria (63339 inhabitants)
70 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)
98 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 1.6 2021-12-23
21:40:14		 37.4757 14.9208 9 2022-03-30
13:04:42		 Bollettino Sismico Italiano INGV 102363031
Reviewed
Rev100 		ML 1.6 2021-12-23
21:40:14		 37.4733 14.9078 8 2021-12-23
21:54:32		 Sala Sismica INGV-Roma 98867281
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-23 21:40:14 ± 0.06
Latitude 37.4757 ± 0.0027
Longitude 14.9208 ± 0.0079
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 102363031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 615
Semi-minor axis of confidence ellipse (meter) 276
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 83
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) 89
Number of associated phases, regardless of their use for origin computation 47
Number of defining phases 47
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.13310
Epicentral distance of station farthest from the epicenter (degree) 0.69518
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 27
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 34
Type of magnitude ML
Reference to an origin 102363031
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-25 17:28:50

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 34
Type of magnitude ML
Reference to an origin 98867281
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-23 21:54:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ISPIC.EHZ. 2021-12-23T21:40:38.99 0.3 undecidable manual S 181 77.1672 50 0.73 56
IV.MSFR.HHZ. 2021-12-23T21:40:37.30 0.6 undecidable manual S 335 68.2761 50 1.39 28
IV.MUCR.HHE. 2021-12-23T21:40:35.01 0.6 undecidable manual S 356 63.0924 50 0.5 42
IV.HVIT.HHZ. 2021-12-23T21:40:34.50 0.6 undecidable manual S 213 64.1913 50 -0.29 44
IV.HMDC.HNN. 2021-12-23T21:40:33.65 0.6 undecidable manual S 192 58.5969 50 0.34 44
IV.HSRS.HHZ. 2021-12-23T21:40:31.16 0.3 undecidable manual S 148 50.1165 50 0.11 71
IV.ECTS.HHZ. 2021-12-23T21:40:30.48 0.6 undecidable manual S 21 48.4182 50 -0.11 47
IV.GALF.HHZ. 2021-12-23T21:40:28.93 0.6 undecidable manual S 310 40.626 50 0.42 45
IV.ISPIC.EHZ. 2021-12-23T21:40:28.07 0.1 undecidable manual P 181 77.1672 50 -0.23 87
IV.MCPD.HHZ. 2021-12-23T21:40:27.36 0.3 undecidable manual P 347 73.371 50 -0.36 64
IV.EPOZ.HHZ. 2021-12-23T21:40:27.27 0.6 undecidable manual S 47 32.0457 105 1.06 35
IV.HVZN.HHZ. 2021-12-23T21:40:27.44 0.3 undecidable manual S 209 37.629 50 -0.28 70
IV.HMDC.HNN. 2021-12-23T21:40:26.34 0.1 undecidable manual P 192 58.5969 50 0.9 72
IV.ESCV.HHZ. 2021-12-23T21:40:26.51 0.3 undecidable manual S 343 31.5462 105 0.48 68
IV.MSFR.HHZ. 2021-12-23T21:40:26.91 0.3 undecidable manual P 335 68.2761 50 -0.04 69
IV.MUCR.HHE. 2021-12-23T21:40:26.48 0.3 undecidable manual P 356 63.0924 50 0.35 66
IV.EVRN.HHZ. 2021-12-23T21:40:25.35 0.6 undecidable manual S 38 30.2475 106 -0.27 47
IV.HAGA.HHZ. 2021-12-23T21:40:25.66 0.3 undecidable manual S 136 29.5482 106 0.28 71
IV.HVIT.HHZ. 2021-12-23T21:40:25.72 0.6 undecidable manual P 213 64.1913 50 -0.58 41
IV.ECZM.HHZ. 2021-12-23T21:40:24.89 0.6 undecidable manual S 357 28.3494 107 -0.1 49
MN.VAE.HHZ. 2021-12-23T21:40:24.26 0.6 undecidable manual P 269 50.0166 50 0.15 47
IV.RAFF.HHZ. 2021-12-23T21:40:24.56 0.1 undecidable manual P 240 56.6988 50 -0.58 83
IV.ESLN.HHZ. 2021-12-23T21:40:24.01 0.6 undecidable manual S 11 24.6531 109 0.26 48
IV.ECTS.HHZ. 2021-12-23T21:40:24.17 0.6 undecidable manual P 21 48.4182 50 0.3 45
IT.LNT.HGZ. 2021-12-23T21:40:23.20 0.6 undecidable manual S 161 21.9669 112 0.31 47
IV.HSRS.HHZ. 2021-12-23T21:40:23.58 0.3 undecidable manual P 148 50.1165 50 -0.56 64
IV.EMPL.HHZ. 2021-12-23T21:40:23.69 0.3 undecidable manual S 11 22.9548 111 0.48 69
IV.ESPC.HHZ. 2021-12-23T21:40:23.70 0.6 undecidable manual S 21 25.8519 109 -0.44 46
IV.GALF.HHZ. 2021-12-23T21:40:22.57 0.3 undecidable manual P 310 40.626 50 -0.1 72
IV.EPZF.HHZ. 2021-12-23T21:40:22.36 0.3 undecidable manual P 352 39.0276 50 -0.07 73
IV.SSY.HHZ. 2021-12-23T21:40:22.01 0.3 undecidable manual P 159 37.7289 50 -0.22 71
IV.ESML.HHZ. 2021-12-23T21:40:21.23 0.3 undecidable manual S 347 16.1727 118 0.15 74
IV.HVZN.HHZ. 2021-12-23T21:40:21.85 0.3 undecidable manual P 209 37.629 50 -0.36 69
IV.HLNI.HHZ. 2021-12-23T21:40:21.25 0.3 undecidable manual S 197 14.7741 121 0.62 66
IV.EPOZ.HHZ. 2021-12-23T21:40:21.28 0.3 undecidable manual P 47 32.0457 105 -0.06 74
IV.EVRN.HHZ. 2021-12-23T21:40:20.71 0.3 undecidable manual P 38 30.2475 106 -0.29 71
IV.ECZM.HHZ. 2021-12-23T21:40:20.33 0.6 undecidable manual P 357 28.3494 107 -0.31 47
IV.ESCV.HHZ. 2021-12-23T21:40:20.87 0.3 undecidable manual P 343 31.5462 105 -0.37 69
IV.HAGA.HHZ. 2021-12-23T21:40:20.55 0.1 undecidable manual P 136 29.5482 106 -0.31 94
IV.EMFS.HHE. 2021-12-23T21:40:20.86 0.6 undecidable manual P 14 27.8499 107 0.32 47
IV.EMPL.HHZ. 2021-12-23T21:40:19.46 0.3 undecidable manual P 11 22.9548 111 -0.15 74
IV.ESPC.HHZ. 2021-12-23T21:40:19.77 0.3 undecidable manual P 21 25.8519 109 -0.37 70
IT.LNT.HGZ. 2021-12-23T21:40:19.39 0.3 undecidable manual P 161 21.9669 112 -0.03 75
IV.ESLN.HHZ. 2021-12-23T21:40:19.71 0.3 undecidable manual P 11 24.6531 109 -0.21 72
IV.ECHR.HNZ. 2021-12-23T21:40:19.62 0.3 undecidable manual P 358 23.3544 110 -0.07 75
IV.ESML.HHZ. 2021-12-23T21:40:18.01 0.1 undecidable manual P 347 16.1727 118 -0.37 95
IV.HLNI.HHZ. 2021-12-23T21:40:18.24 0.1 undecidable manual P 197 14.7741 121 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESML.HNN. ML:1.6 0.0003322906 0.2432 AML other m 2021-12-23T21:40:21.56
IV.HLNI.HHE. ML:1.9 0.0008366058000000001 0.1792 AML other m 2021-12-23T21:40:21.56
IV.ESML.HHN. ML:1.6 0.0004165 0.18 AML other m 2021-12-23T21:40:21.55
IV.HLNI.HHN. ML:1.9 0.0008015 0.1 AML other m 2021-12-23T21:40:21.89
IV.ESML.HHE. ML:1.5 0.000304674 0.1792 AML other m 2021-12-23T21:40:22.57
IV.ESML.HNE. ML:1.4 0.00025512425 0.1792 AML other m 2021-12-23T21:40:22.57
IV.HSRS.HNE. ML:1.6 0.000100606915 1.552 AML other m 2021-12-23T21:40:24.89
IV.HAGA.HHE. ML:1.5 0.00016583629999999998 0.1024 AML other m 2021-12-23T21:40:26.16
IV.HAGA.HHN. ML:1.4 0.00013901025 0.1024 AML other m 2021-12-23T21:40:26.21
IV.EPOZ.HHE. ML:1.4 0.00011872166000000001 0.1792 AML other m 2021-12-23T21:40:27.61
IV.EPOZ.HHN. ML:1.6 0.00016958415 0.2176 AML other m 2021-12-23T21:40:27.52
IV.ESCV.HHE. ML:1.8 0.00026117009999999995 0.2176 AML other m 2021-12-23T21:40:28.17
IV.EPOZ.HNE. ML:1.4 0.00011817612 0.128 AML other m 2021-12-23T21:40:28.52
IV.EVRN.HHE. ML:1.7 0.00024628569999999997 0.2048 AML other m 2021-12-23T21:40:29.28
IV.EVRN.HNE. ML:1.6 0.0002138751 0.3328 AML other m 2021-12-23T21:40:29.45
IV.GALF.HHE. ML:1.8 0.000195459 0.4352 AML other m 2021-12-23T21:40:29.64
IV.EVRN.HHN. ML:1.7 0.0002266204 0.2432 AML other m 2021-12-23T21:40:29.95
IV.ESCV.HHN. ML:1.8 0.00032321615000000003 1.7312 AML other m 2021-12-23T21:40:29.11
IV.GALF.HHN. ML:1.8 0.00022897795000000003 0.384 AML other m 2021-12-23T21:40:30.11
IV.EVRN.HNN. ML:1.8 0.00027425495 0.192 AML other m 2021-12-23T21:40:30.33
IV.SSY.HNE. ML:1.6 0.00015717514999999998 0.1664 AML other m 2021-12-23T21:40:30.97
IV.EPOZ.HNN. ML:1.1 0.00006109345000000001 0.064 AML other m 2021-12-23T21:40:31.48
IV.HSRS.HHN. ML:1.3 0.00005365556 0.1024 AML other m 2021-12-23T21:40:31.45
IV.SSY.HHN. ML:2.2 0.0005964216499999999 0.1664 AML other m 2021-12-23T21:40:31.65
IV.SSY.HNN. ML:1.7 0.00018202570000000001 0.1536 AML other m 2021-12-23T21:40:31.58
IV.GALF.HNE. ML:1.5 0.00011179153 1.2064 AML other m 2021-12-23T21:40:32.65
IV.HVZN.HHE. ML:1.8 0.0002079866 0.4352 AML other m 2021-12-23T21:40:32.63
IV.SSY.HHE. ML:1.8 0.000234985215 0.128 AML other m 2021-12-23T21:40:34.08
IV.HSRS.HNN. ML:1.8 0.0001606716 1.1136 AML other m 2021-12-23T21:40:34.69
IV.HVZN.HHN. ML:1.8 0.00022679925 1.5648 AML other m 2021-12-23T21:40:36.92
IV.HSRS.HHE. ML:1.3 0.0000506212 0.4736 AML other m 2021-12-23T21:40:36.70
IV.MCPD.HHE. ML:1.3 0.000030914205 0.3968 AML other m 2021-12-23T21:40:37.51
IV.MCPD.HHN. ML:1.3 0.000029371145 0.4736 AML other m 2021-12-23T21:40:38.33
IV.GALF.HNN. ML:1.6 0.00013917496499999999 1.0112 AML other m 2021-12-23T21:40:43.53
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