Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 23-12-2021 and time 22:50:10 (Italy) in region 6 km SW Motta Sant'Anastasia (CT)

A magnitude ML 1.8 earthquake occured in region: 6 km SW Motta Sant'Anastasia (CT), on

  • 23-12-2021 21:50:10 (UTC)
  • 23-12-2021 22:50:10 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.4700, 14.9220 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 12 48228 109754
Camporotondo Etneo CT 13 5023 114777
Belpasso CT 15 28108 142885
San Pietro Clarenza CT 15 7743 150628
Catania CT 15 314555 465183
Gravina di Catania CT 16 25838 491021
Mascalucia CT 16 31958 522979
Santa Maria di Licodia CT 17 7641 530620
Sant'Agata li Battiati CT 17 9479 540099
Tremestieri Etneo CT 18 20589 560688
Ragalna CT 18 3924 564612
Nicolosi CT 19 7463 572075
San Giovanni la Punta CT 19 23060 595135
San Gregorio di Catania CT 20 11966 607101
Biancavilla CT 20 24007 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)
56 Km NW of Siracusa (122291 inhabitants)
63 Km N of Ragusa (73313 inhabitants)
67 Km NE of Vittoria (63339 inhabitants)
69 Km N of Modica (54633 inhabitants)
74 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 1.8 2021-12-23
21:50:10		 37.4702 14.9223 10 2022-03-30
13:04:42		 Bollettino Sismico Italiano INGV 102526891
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-23 21:50:10 ± 0.08
Latitude 37.4702 ± 0.0027
Longitude 14.9223 ± 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 102526891

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 802
Semi-minor axis of confidence ellipse (meter) 101
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 272
Circular confidence region, given by single value of horizontal uncertainty (meter) 800.0
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) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.12770
Epicentral distance of station farthest from the epicenter (degree) 0.68978
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 29
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 102526891
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-29 10:18:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ISPIC.EHZ. 2021-12-23T21:50:34.12 0.6 undecidable manual S 181 76.5678 50 0.86 35
IV.MSFR.HHZ. 2021-12-23T21:50:32.19 0.6 undecidable manual S 335 68.9754 50 0.96 34
IV.MUCR.HHE. 2021-12-23T21:50:30.98 0.6 undecidable manual S 356 63.6918 50 1.15 32
IV.HVIT.HHZ. 2021-12-23T21:50:29.54 0.6 undecidable manual S 214 63.6918 50 -0.29 45
IV.HMDC.HNN. 2021-12-23T21:50:28.60 0.6 undecidable manual S 192 57.9975 50 0.28 45
IV.HSRS.HHZ. 2021-12-23T21:50:26.40 0.6 undecidable manual S 148 49.5171 50 0.35 45
IV.SSY.HHZ. 2021-12-23T21:50:23.69 0.6 undecidable manual S 159 37.1295 50 0.94 37
IV.ISPIC.EHZ. 2021-12-23T21:50:23.36 0.1 positive manual P 181 76.5678 50 -0.14 90
IV.MCPD.HHZ. 2021-12-23T21:50:23.04 0.1 undecidable manual P 347 73.9704 50 -0.07 91
IV.EMCN.HHN. 2021-12-23T21:50:22.08 0.6 undecidable manual S 15 36.9297 50 -0.61 43
IV.HVZN.HHZ. 2021-12-23T21:50:22.79 0.6 undecidable manual S 209 37.1295 50 0.04 49
IV.MSFR.HHZ. 2021-12-23T21:50:22.48 0.3 undecidable manual P 335 68.9754 50 0.15 68
IV.AIO.HHZ. 2021-12-23T21:50:21.35 0.3 undecidable manual P 26 61.8936 50 0.11 69
IV.HMDC.HNN. 2021-12-23T21:50:21.65 0.3 undecidable manual P 192 57.9975 50 1 52
IV.MUCR.HHE. 2021-12-23T21:50:21.90 0.3 undecidable manual P 356 63.6918 50 0.38 65
IV.HVIT.HHZ. 2021-12-23T21:50:20.72 0.3 undecidable manual P 214 63.6918 50 -0.8 57
IV.HAGA.HHZ. 2021-12-23T21:50:20.97 0.6 undecidable manual S 135 29.0487 50 0.39 46
IV.EVRN.HHZ. 2021-12-23T21:50:20.89 0.6 undecidable manual S 38 30.6471 50 -0.13 49
IV.ESLN.HHZ. 2021-12-23T21:50:19.93 0.6 undecidable manual S 10 25.1526 50 0.38 46
IV.EMPL.HHZ. 2021-12-23T21:50:19.63 0.6 undecidable manual S 10 23.5542 113 0.57 45
IV.ECHR.HHE. 2021-12-23T21:50:19.75 0.6 undecidable manual S 358 23.9538 113 0.55 45
IV.ESPC.HHN. 2021-12-23T21:50:19.52 0.6 undecidable manual S 21 26.3514 50 -0.34 47
IV.RAFF.HHZ. 2021-12-23T21:50:19.88 0.1 undecidable manual P 241 56.499 50 -0.53 85
IV.EPZF.HHZ. 2021-12-23T21:50:18.22 0.3 undecidable manual P 352 39.627 50 0.4 68
IV.GALF.HHZ. 2021-12-23T21:50:18.06 0.3 undecidable manual P 311 41.1255 50 0.02 73
IT.LNT.HGZ. 2021-12-23T21:50:18.68 0.6 undecidable manual S 161 21.3675 115 0.31 48
IV.HSRS.HHZ. 2021-12-23T21:50:18.95 0.3 undecidable manual P 148 49.5171 50 -0.38 67
IV.ESML.HHZ. 2021-12-23T21:50:17.12 0.6 undecidable manual S 347 16.872 121 0.13 50
IV.EPOZ.HHZ. 2021-12-23T21:50:17.01 0.1 undecidable manual P 46 32.3454 50 0.31 93
IV.EPIT.HHN. 2021-12-23T21:50:17.78 0.6 undecidable manual P 17 39.627 50 -0.03 49
IV.EMCN.HHN. 2021-12-23T21:50:17.13 0.3 undecidable manual P 15 36.9297 50 -0.26 70
IV.HVZN.HHZ. 2021-12-23T21:50:17.18 0.3 undecidable manual P 209 37.1295 50 -0.25 71
IV.SSY.HHZ. 2021-12-23T21:50:17.30 0.1 negative manual P 159 37.1295 50 -0.13 96
IV.EVRN.HHZ. 2021-12-23T21:50:16.19 0.3 undecidable manual P 38 30.6471 50 -0.25 71
IV.ESCV.HHZ. 2021-12-23T21:50:16.38 0.3 undecidable manual P 343 32.1456 50 -0.27 71
IV.ECZM.HHN. 2021-12-23T21:50:16.32 0.3 undecidable manual P 357 29.0487 50 0.15 73
IV.ECBD.HHN. 2021-12-23T21:50:16.64 0.3 undecidable manual P 23 37.3293 50 -0.81 59
IV.HLNI.HHZ. 2021-12-23T21:50:16.50 0.3 undecidable manual S 198 14.1747 126 0.28 73
IV.ESPC.HHN. 2021-12-23T21:50:15.18 0.3 undecidable manual P 21 26.3514 50 -0.58 66
IV.ESLN.HHZ. 2021-12-23T21:50:15.53 0.1 undecidable manual P 10 25.1526 50 -0.05 100
IV.EMPL.HHZ. 2021-12-23T21:50:15.30 0.3 undecidable manual P 10 23.5542 113 0 75
IV.EMFS.HHE. 2021-12-23T21:50:15.66 0.3 undecidable manual P 13 28.4493 50 -0.43 69
IV.ECHR.HHE. 2021-12-23T21:50:15.25 0.3 undecidable manual P 358 23.9538 113 -0.13 74
IV.HAGA.HHZ. 2021-12-23T21:50:15.91 0.1 undecidable manual P 135 29.0487 50 -0.27 95
IT.LNT.HGZ. 2021-12-23T21:50:14.69 0.1 undecidable manual P 161 21.3675 115 -0.21 97
IV.ESML.HHZ. 2021-12-23T21:50:14.24 0.3 undecidable manual P 347 16.872 121 0.14 75
IV.HLNI.HHZ. 2021-12-23T21:50:13.55 0.1 negative manual P 198 14.1747 126 -0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HLNI.HHN. ML:2.0 0.000904 0.1 AML other m 2021-12-23T21:50:16.77
IV.HLNI.HHE. ML:2.2 0.001435 0.22 AML other m 2021-12-23T21:50:16.71
IV.ESML.HNE. ML:1.5 0.00029049999999999996 0.86 AML other m 2021-12-23T21:50:17.48
IV.ESML.HNN. ML:1.5 0.000287 0.54 AML other m 2021-12-23T21:50:18.83
IV.HAGA.HHE. ML:1.8 0.00029749999999999997 0.6 AML other m 2021-12-23T21:50:21.06
IV.HAGA.HHN. ML:1.6 0.00018449999999999999 0.94 AML other m 2021-12-23T21:50:22.08
IV.ESML.HHE. ML:1.5 0.00024818400000000003 0.4224 AML other m 2021-12-23T21:50:17.27
IV.ESML.HHN. ML:1.4 0.00020062685 0.1408 AML other m 2021-12-23T21:50:17.76
IV.EMPL.HHN. ML:2.2 0.0011435409999999999 0.2176 AML other m 2021-12-23T21:50:20.18
IV.EMPL.HHE. ML:2.1 0.0008102957 0.2176 AML other m 2021-12-23T21:50:21.32
IV.EVRN.HNE. ML:1.7 0.00024126795 0.2048 AML other m 2021-12-23T21:50:25.10
IV.EVRN.HHE. ML:1.8 0.00033407965 0.1792 AML other m 2021-12-23T21:50:25.10
IV.ESCV.HHE. ML:1.7 0.00020370365000000002 0.4992 AML other m 2021-12-23T21:50:24.12
IV.ESCV.HHN. ML:1.7 0.00023926295 0.2432 AML other m 2021-12-23T21:50:27.71
IV.HVZN.HHE. ML:1.9 0.00031721025000000004 0.5248 AML other m 2021-12-23T21:50:27.03
IV.SSY.HHE. ML:1.9 0.00027402155 0.2304 AML other m 2021-12-23T21:50:25.75
IV.SSY.HHN. ML:2.3 0.00078143395 0.1792 AML other m 2021-12-23T21:50:29.00
IV.SSY.HNE. ML:1.7 0.0001793254 0.2944 AML other m 2021-12-23T21:50:25.68
IV.HVIT.HHE. ML:1.6 0.000077070415 0.1024 AML other m 2021-12-23T21:50:33.63
IV.AIO.HHN. ML:1.2 0.000037390470000000005 0.384 AML other m 2021-12-23T21:50:32.39
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