Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 24-12-2021 and time 06:55:48 (UTC) in region 8 km SW Motta Sant'Anastasia (CT)

A magnitude ML 1.6 earthquake occured in region: 8 km SW Motta Sant'Anastasia (CT), on

  • 24-12-2021 06:55:48 (UTC)
  • 24-12-2021 07:55:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.4670, 14.9080 at 8 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 8 12116 12116
Misterbianco CT 11 49410 61526
Paternò CT 12 48228 109754
Camporotondo Etneo CT 14 5023 114777
Belpasso CT 15 28108 142885
San Pietro Clarenza CT 16 7743 150628
Catania CT 16 314555 465183
Santa Maria di Licodia CT 17 7641 472824
Gravina di Catania CT 17 25838 498662
Mascalucia CT 18 31958 530620
Sant'Agata li Battiati CT 18 9479 540099
Ragalna CT 19 3924 544023
Tremestieri Etneo CT 19 20589 564612
Nicolosi CT 20 7463 572075
Scordia CT 20 17095 589170
Biancavilla CT 20 24007 613177

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km W of Catania (314555 inhabitants)
28 Km SW of Acireale (52622 inhabitants)
57 Km NW of Siracusa (122291 inhabitants)
62 Km N of Ragusa (73313 inhabitants)
66 Km NE of Vittoria (63339 inhabitants)
69 Km N of Modica (54633 inhabitants)
73 Km NE of Gela (75827 inhabitants)
75 Km E of Caltanissetta (63360 inhabitants)
96 Km SW of Reggio di Calabria (183035 inhabitants)
99 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 2021-12-24
06:55:48		 37.4672 14.9078 8 2022-03-30
13:04:24		 Bollettino Sismico Italiano INGV 99105671
Reviewed
Rev100 		ML 1.8 2021-12-24
06:55:48		 37.4737 14.9313 10 2021-12-24
07:04:40		 Sala Sismica INGV-Roma 98892031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-24 06:55:48 ± 0.09
Latitude 37.4672 ± 0.0045
Longitude 14.9078 ± 0.0102
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99105671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 906
Semi-minor axis of confidence ellipse (meter) 130
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) 910.0
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 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0.12231
Epicentral distance of station farthest from the epicenter (degree) 0.92630
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 98892031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-24 07:04:40

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 99105671
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-15 17:43:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MSRU.HHZ. 2021-12-24T06:56:20.02 0.6 undecidable manual S 31 102.8193 50 0.54 37
IV.AIO.HHZ. 2021-12-24T06:56:08.50 0.6 undecidable manual S 27 62.7927 50 -0.28 44
IV.RAFF.HHZ. 2021-12-24T06:56:07.59 0.6 undecidable manual S 241 55.2003 50 0.82 36
IV.MSRU.HHZ. 2021-12-24T06:56:06.09 0.3 undecidable manual P 31 102.8193 50 -0.48 59
IV.SSY.HHZ. 2021-12-24T06:56:02.49 0.6 undecidable manual S 157 37.3293 50 0.5 42
IV.EPOZ.HHZ. 2021-12-24T06:56:01.98 0.3 undecidable manual S 47 33.5442 104 1.05 51
IV.AIO.HHZ. 2021-12-24T06:55:59.58 0.3 undecidable manual P 27 62.7927 50 -0.82 56
IV.HAGA.HHZ. 2021-12-24T06:55:59.64 0.6 undecidable manual S 133 29.748 106 0 49
MN.VAE.HHZ. 2021-12-24T06:55:58.57 0.3 undecidable manual P 270 48.8178 50 0.32 66
IV.EMPL.HHZ. 2021-12-24T06:55:58.47 0.6 undecidable manual S 13 24.1536 109 0.67 43
IV.ESPC.HHZ. 2021-12-24T06:55:58.17 0.6 undecidable manual S 23 27.1506 107 -0.61 42
IV.RAFF.HHZ. 2021-12-24T06:55:58.55 0.1 positive manual P 241 55.2003 50 -0.68 80
IV.ESLN.HHZ. 2021-12-24T06:55:58.70 0.6 undecidable manual S 13 25.752 108 0.36 46
IV.EMNR.HHZ. 2021-12-24T06:55:57.32 0.6 undecidable manual P 15 40.1265 50 0.41 44
IV.ECBD.HHN. 2021-12-24T06:55:57.20 0.6 undecidable manual P 24 38.1285 50 0.6 41
IT.LNT.HGZ. 2021-12-24T06:55:57.38 0.3 undecidable manual S 157 21.4674 111 0.44 69
IV.EPIT.HHN. 2021-12-24T06:55:57.76 0.3 undecidable manual P 19 40.3263 50 0.82 56
IV.GALF.HHZ. 2021-12-24T06:55:56.83 0.3 undecidable manual P 312 40.3263 50 -0.12 71
IV.EPZF.HHZ. 2021-12-24T06:55:56.79 0.3 undecidable manual P 354 39.8268 50 -0.07 72
IV.HVZN.HHZ. 2021-12-24T06:55:56.02 0.3 undecidable manual P 208 36.2415 50 -0.29 69
IV.ESVO.HHE. 2021-12-24T06:55:55.84 0.3 undecidable manual P 6 34.1436 104 -0.14 72
IV.EMFS.HHZ. 2021-12-24T06:55:55.68 0.6 undecidable manual P 16 29.1486 106 0.68 42
IV.HLNI.HHZ. 2021-12-24T06:55:55.20 0.3 undecidable manual S 193 13.5753 121 0.75 63
IV.ESML.HHZ. 2021-12-24T06:55:55.87 0.6 undecidable manual S 352 16.9719 116 0.39 47
IV.SSY.HHZ. 2021-12-24T06:55:55.94 0.1 negative manual P 157 37.3293 50 -0.53 88
IV.EPOZ.HHZ. 2021-12-24T06:55:55.94 0.3 undecidable manual P 47 33.5442 104 0.08 72
IV.ESLN.HHZ. 2021-12-24T06:55:54.21 0.1 negative manual P 13 25.752 108 -0.16 95
IV.HAGA.HHZ. 2021-12-24T06:55:54.56 0.1 negative manual P 133 29.748 106 -0.56 85
IV.EMPL.HHZ. 2021-12-24T06:55:54.04 0.3 undecidable manual P 13 24.1536 109 -0.02 74
IV.ESPC.HHZ. 2021-12-24T06:55:54.00 0.3 undecidable manual P 23 27.1506 107 -0.62 63
IV.ECZM.HHZ. 2021-12-24T06:55:54.93 0.3 undecidable manual P 359 29.3484 106 -0.11 72
IV.ECHR.HNZ. 2021-12-24T06:55:53.90 0.3 undecidable manual P 1 24.3534 109 -0.19 71
IT.LNT.HGZ. 2021-12-24T06:55:53.36 0.3 undecidable manual P 157 21.4674 111 -0.2 71
IV.ESML.HHZ. 2021-12-24T06:55:52.42 0.3 undecidable manual P 352 16.9719 116 -0.3 70
IV.HLNI.HHZ. 2021-12-24T06:55:52.21 0.1 negative manual P 193 13.5753 121 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HLNI.HHE. ML:1.9 0.0008833971 0.16 AML other m 2021-12-24T06:55:55.39
IV.HLNI.HHN. ML:1.9 0.00090116055 0.0992 AML other m 2021-12-24T06:55:55.45
IV.ESML.HNN. ML:1.3 0.00017302845 0.4704 AML other m 2021-12-24T06:55:56.34
IV.ESML.HNE. ML:1.2 0.00015572760000000002 0.1888 AML other m 2021-12-24T06:55:56.16
IV.ESML.HHE. ML:1.4 0.00021238409999999998 0.5376 AML other m 2021-12-24T06:55:56.43
IV.ESML.HHN. ML:1.3 0.00017004430000000002 0.1184 AML other m 2021-12-24T06:55:56.16
IV.EMPL.HHE. ML:2.1 0.00082869825 0.5984 AML other m 2021-12-24T06:55:58.83
IV.EMPL.HHN. ML:2.2 0.0011353930000000002 0.24 AML other m 2021-12-24T06:55:58.83
IV.HAGA.HHE. ML:1.4 0.00013637358 0.1824 AML other m 2021-12-24T06:55:59.72
IV.HAGA.HHN. ML:1.5 0.00015975815 0.48 AML other m 2021-12-24T06:55:59.96
IV.HVZN.HHE. ML:1.7 0.00020846310000000002 0.5408 AML other m 2021-12-24T06:56:02.11
IV.SSY.HNE. ML:1.4 0.000103869425 0.2208 AML other m 2021-12-24T06:56:02.84
IV.SSY.HHN. ML:2.0 0.00037160175000000003 0.1984 AML other m 2021-12-24T06:56:02.99
IV.SSY.HHE. ML:1.6 0.000149814755 0.2208 AML other m 2021-12-24T06:56:02.82
IV.RAFF.HHN. ML:1.4 0.00006208649000000001 0.2592 AML other m 2021-12-24T06:56:07.75
IV.RAFF.HHE. ML:1.4 0.000054277944999999994 0.24 AML other m 2021-12-24T06:56:08.14
IV.AIO.HHN. ML:1.3 0.000032977965 1.1808 AML other m 2021-12-24T06:56:09.63
IV.AIO.HHE. ML:1.4 0.000053472795 0.6784 AML other m 2021-12-24T06:56:09.48
IV.MSRU.HHE. ML:1.7 0.000045080605000000004 0.5984 AML other m 2021-12-24T06:56:20.28
IV.MSRU.HHN. ML:1.9 0.00007595 0.76 AML other m 2021-12-24T06:56:20.96
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