Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 23-12-2021 and time 23:47:35 (Italy) in region 6 km SW Motta Sant'Anastasia (CT)

A magnitude ML 1.7 earthquake occured in region: 6 km SW Motta Sant'Anastasia (CT), on

  • 23-12-2021 22:47:35 (UTC)
  • 23-12-2021 23:47:35 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.4840, 14.9180 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 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 15 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)
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 1.7 2021-12-23
22:47:35		 37.4842 14.9178 9 2022-03-30
13:04:42		 Bollettino Sismico Italiano INGV 102534891
Reviewed
Rev100 		ML 1.7 2021-12-23
22:47:35		 37.4922 14.9038 10 2021-12-23
23:31:09		 Sala Sismica INGV-Roma 98874801
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-23 22:47:35 ± 0.07
Latitude 37.4842 ± 0.0036
Longitude 14.9178 ± 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 102534891

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 715
Semi-minor axis of confidence ellipse (meter) 232
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 92
Circular confidence region, given by single value of horizontal uncertainty (meter) 710.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 45
Number of defining phases 45
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.13760
Epicentral distance of station farthest from the epicenter (degree) 0.90742
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 26
Type of magnitude ML
Reference to an origin 102534891
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-29 15:54:57

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 98874801
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-23 23:31:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ISPIC.EHZ. 2021-12-23T22:48:00.06 0.1 undecidable manual S 181 78.0663 50 0.72 56
IV.HVIT.HHZ. 2021-12-23T22:47:55.46 0.1 undecidable manual S 213 64.7907 50 -0.33 65
IV.HMDC.HHZ. 2021-12-23T22:47:54.89 0.1 undecidable manual S 192 59.496 50 0.52 42
IV.RAFF.HHZ. 2021-12-23T22:47:54.88 0.1 undecidable manual S 240 56.8986 50 1.19 47
IV.MSRU.HHZ. 2021-12-23T22:47:52.66 0.1 undecidable manual P 31 100.7214 50 -0.17 63
IV.HSRS.HNN. 2021-12-23T22:47:52.42 0.1 undecidable manual S 148 51.0156 50 0.29 45
IV.GALF.HHZ. 2021-12-23T22:47:50.03 0.1 undecidable manual S 309 39.8268 50 0.91 37
IV.ISPIC.EHZ. 2021-12-23T22:47:49.03 0.1 undecidable manual P 181 78.0663 50 -0.29 85
IV.SSY.HHZ. 2021-12-23T22:47:49.73 0.1 undecidable manual S 159 38.7279 50 0.88 38
IV.HVZN.HHZ. 2021-12-23T22:47:48.68 0.1 undecidable manual S 208 38.3283 50 -0.05 48
IV.EPOZ.HHZ. 2021-12-23T22:47:47.98 0.1 undecidable manual S 49 31.6461 50 1.04 35
IV.ECZM.HHN. 2021-12-23T22:47:46.01 0.1 undecidable manual S 357 27.4503 109 0.32 47
IV.HAGA.HHZ. 2021-12-23T22:47:46.75 0.1 undecidable manual S 137 30.4473 50 0.13 72
IV.HVIT.HHZ. 2021-12-23T22:47:46.61 0.1 undecidable manual P 213 64.7907 50 -0.67 59
MN.VAE.HHZ. 2021-12-23T22:47:45.15 0.1 undecidable manual P 268 49.7169 50 0.19 69
IV.RAFF.HHZ. 2021-12-23T22:47:45.60 0.1 undecidable manual P 240 56.8986 50 -0.46 86
IV.HMDC.HHZ. 2021-12-23T22:47:45.99 0.1 undecidable manual P 192 59.496 50 -0.46 64
IV.ESCV.HHZ. 2021-12-23T22:47:45.63 0.1 undecidable manual S 343 30.5472 50 -1.01 36
IV.ESLN.HHZ. 2021-12-23T22:47:45.08 0.1 undecidable manual S 12 23.754 111 0.6 43
IV.ECHR.HHE. 2021-12-23T22:47:44.18 0.1 undecidable manual S 359 22.4553 112 0.12 49
IV.EMPL.HHZ. 2021-12-23T22:47:44.38 0.1 undecidable manual S 12 22.0668 113 0.43 69
IT.LNT.HGZ. 2021-12-23T22:47:44.29 0.1 undecidable manual S 161 22.9548 112 0.06 50
IV.ESPC.HHN. 2021-12-23T22:47:44.55 0.1 undecidable manual S 23 25.0527 110 -0.36 46
IV.HSRS.HNN. 2021-12-23T22:47:44.61 0.1 undecidable manual P 148 51.0156 50 -0.55 63
IV.SSY.HHZ. 2021-12-23T22:47:43.02 0.1 undecidable manual P 159 38.7279 50 -0.24 93
IV.EMNR.HHZ. 2021-12-23T22:47:43.32 0.1 undecidable manual P 14 38.1285 50 0.16 71
IV.GALF.HHZ. 2021-12-23T22:47:43.21 0.1 undecidable manual P 309 39.8268 50 -0.22 70
IV.EPZF.HHZ. 2021-12-23T22:47:43.25 0.1 undecidable manual P 352 38.0286 50 0.09 72
IV.ESVO.HHE. 2021-12-23T22:47:42.59 0.1 undecidable manual P 5 32.1456 50 0.35 69
IV.HLNI.HHZ. 2021-12-23T22:47:42.50 0.1 undecidable manual S 195 15.5733 121 0.57 67
IV.EPOZ.HHZ. 2021-12-23T22:47:42.35 0.1 undecidable manual P 49 31.6461 50 0.19 71
IV.HVZN.HHZ. 2021-12-23T22:47:42.94 0.1 undecidable manual P 208 38.3283 50 -0.26 69
IV.EMFO.HHE. 2021-12-23T22:47:42.23 0.1 undecidable manual P 28 31.746 50 0.04 73
IV.HAGA.HHZ. 2021-12-23T22:47:41.61 0.1 undecidable manual P 137 30.4473 50 -0.37 92
IV.ESCV.HHZ. 2021-12-23T22:47:41.89 0.1 undecidable manual P 343 30.5472 50 -0.1 73
IV.ECBD.HHN. 2021-12-23T22:47:41.95 0.1 undecidable manual P 24 36.0417 50 -0.89 38
IV.ECZM.HHN. 2021-12-23T22:47:41.51 0.1 undecidable manual P 357 27.4503 109 0.06 74
IV.ESML.HHZ. 2021-12-23T22:47:41.47 0.1 undecidable manual S 347 15.2736 121 -0.36 47
IV.ESPC.HHN. 2021-12-23T22:47:40.53 0.1 undecidable manual P 23 25.0527 110 -0.46 68
IV.ESLN.HHZ. 2021-12-23T22:47:40.84 0.1 undecidable manual P 12 23.754 111 0.1 98
IV.ECHR.HHE. 2021-12-23T22:47:40.44 0.1 undecidable manual P 359 22.4553 112 -0.06 74
IV.EMPL.HHZ. 2021-12-23T22:47:40.55 0.1 undecidable manual P 12 22.0668 113 0.11 98
IT.LNT.HGZ. 2021-12-23T22:47:40.49 0.1 undecidable manual P 161 22.9548 112 -0.11 74
IV.ESML.HHZ. 2021-12-23T22:47:39.05 0.1 undecidable manual P 347 15.2736 121 -0.17 74
IV.HLNI.HHZ. 2021-12-23T22:47:39.35 0.1 negative manual P 195 15.5733 121 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESML.HNN. ML:1.5 0.0003195 1.34 AML other m 2021-12-23T22:47:42.77
IV.ESML.HHE. ML:1.5 0.00030000000000000003 1.06 AML other m 2021-12-23T22:47:42.53
IV.HLNI.HHN. ML:1.8 0.000558 1.48 AML other m 2021-12-23T22:47:42.74
IV.HLNI.HHE. ML:1.9 0.0008095 0.18 AML other m 2021-12-23T22:47:42.71
IV.ESML.HHN. ML:1.5 0.00033400000000000004 1.5 AML other m 2021-12-23T22:47:43.76
IV.EPOZ.HHN. ML:1.5 0.00014299999999999998 0.94 AML other m 2021-12-23T22:47:43.86
IV.SSY.HHE. ML:1.8 0.00022749999999999997 0.72 AML other m 2021-12-23T22:47:44.19
IV.ESML.HNE. ML:1.5 0.00029299999999999997 0.5 AML other m 2021-12-23T22:47:45.28
IV.EMPL.HHE. ML:2.2 0.0009805 0.54 AML other m 2021-12-23T22:47:45.38
IV.EMPL.HHN. ML:2.2 0.0010550000000000002 0.62 AML other m 2021-12-23T22:47:46.98
IV.HAGA.HHN. ML:1.4 0.000128 0.4 AML other m 2021-12-23T22:47:47.44
IV.HAGA.HHE. ML:1.5 0.00014450000000000002 1.24 AML other m 2021-12-23T22:47:47.88
IV.EPOZ.HHE. ML:1.5 0.000135 0.82 AML other m 2021-12-23T22:47:48.64
IV.ESCV.HHE. ML:1.6 0.000188 1.38 AML other m 2021-12-23T22:47:48.30
IV.ESCV.HHN. ML:1.6 0.0001955 1.5 AML other m 2021-12-23T22:47:49.10
IV.HVZN.HHN. ML:1.7 0.0001895 0.52 AML other m 2021-12-23T22:47:50.51
IV.HVZN.HHE. ML:1.7 0.00017099999999999998 1.5 AML other m 2021-12-23T22:47:53.81
IV.SSY.HNE. ML:1.7 0.0001785 0.56 AML other m 2021-12-23T22:47:55.34
IV.RAFF.HHN. ML:1.4 0.0000621 0.66 AML other m 2021-12-23T22:47:55.53
IV.RAFF.HHE. ML:1.5 0.00006974999999999999 0.28 AML other m 2021-12-23T22:47:55.57
IV.SSY.HHN. ML:2.2 0.0005560000000000001 0.56 AML other m 2021-12-23T22:47:56.34
IV.SSY.HNN. ML:1.7 0.0001655 1.06 AML other m 2021-12-23T22:47:56.60
IV.HVIT.HHE. ML:1.6 0.00007335 0.2 AML other m 2021-12-23T22:47:56.40
IV.HVIT.HHN. ML:1.8 0.0001106 1.38 AML other m 2021-12-23T22:47:56.77
IV.ISPIC.EHN. ML:1.9 0.00010675 0.52 AML other m 2021-12-23T22:48:00.31
IV.ISPIC.EHE. ML:1.9 0.000123 1.34 AML other m 2021-12-23T22:48:00.86
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