Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 23-12-2021 and time 21:51:57 (UTC) in region 5 km SW Motta Sant'Anastasia (CT)

A magnitude ML 1.7 earthquake occured in region: 5 km SW Motta Sant'Anastasia (CT), on

  • 23-12-2021 21:51:57 (UTC)
  • 23-12-2021 22:51:57 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.4820, 14.9230 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 5 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
Catania CT 15 314555 465183
Gravina di Catania CT 15 25838 491021
Santa Maria di Licodia CT 15 7641 498662
Mascalucia CT 15 31958 530620
Sant'Agata li Battiati CT 16 9479 540099
Ragalna CT 17 3924 544023
Tremestieri Etneo CT 17 20589 564612
Nicolosi CT 17 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 19 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)
57 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
21:51:57		 37.4823 14.9233 9 2022-03-30
13:04:42		 Bollettino Sismico Italiano INGV 102527141
Reviewed
Rev100 		ML 1.8 2021-12-23
21:51:57		 37.496 14.9262 10 2021-12-23
22:16:42		 Sala Sismica INGV-Roma 98869421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-23 21:51:57 ± 0.07
Latitude 37.4823 ± 0.0036
Longitude 14.9233 ± 0.0091
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 102527141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 729
Semi-minor axis of confidence ellipse (meter) 340
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 82
Circular confidence region, given by single value of horizontal uncertainty (meter) 730.0
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 35
Number of defining phases 35
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) 0.14029
Epicentral distance of station farthest from the epicenter (degree) 0.70147
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 98869421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-23 22:16:42

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 29
Type of magnitude ML
Reference to an origin 102527141
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-29 10:33:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ISPIC.EHZ. 2021-12-23T21:52:22.36 0.3 undecidable manual S 181 77.8665 50 0.61 59
IV.RAFF.HHZ. 2021-12-23T21:52:17.45 0.6 undecidable manual S 240 57.2982 50 1.21 31
IV.HMDC.HHZ. 2021-12-23T21:52:17.09 0.3 undecidable manual S 192 59.3961 50 0.28 66
IV.GALF.HHZ. 2021-12-23T21:52:12.50 0.6 undecidable manual S 309 40.3263 50 0.77 39
IV.SSY.HHZ. 2021-12-23T21:52:11.66 0.6 undecidable manual S 160 38.3283 50 0.45 44
IV.ISPIC.EHZ. 2021-12-23T21:52:11.39 0.1 undecidable manual P 181 77.8665 50 -0.32 84
IV.MCPD.HHZ. 2021-12-23T21:52:10.73 0.3 undecidable manual P 347 72.6717 50 -0.19 65
IV.EPOZ.HHZ. 2021-12-23T21:52:10.48 0.6 undecidable manual S 48 31.3464 106 1.18 33
IV.HVZN.HHZ. 2021-12-23T21:52:10.81 0.3 undecidable manual S 209 38.4282 50 -0.4 67
IV.HAGA.HHZ. 2021-12-23T21:52:08.99 0.3 undecidable manual S 137 29.9478 106 0.18 71
IV.HMDC.HHZ. 2021-12-23T21:52:08.17 0.3 undecidable manual P 192 59.3961 50 -0.69 58
IV.RAFF.HHZ. 2021-12-23T21:52:07.95 0.3 undecidable manual P 240 57.2982 50 -0.58 61
IV.ESPC.HHN. 2021-12-23T21:52:07.05 0.6 undecidable manual S 21 25.0527 109 -0.15 48
IV.ESLN.HHZ. 2021-12-23T21:52:07.15 0.6 undecidable manual S 11 23.8539 110 0.34 46
IV.EFIU.HHZ. 2021-12-23T21:52:06.36 0.3 undecidable manual P 36 42.4242 50 0.12 71
IV.ECHR.HHE. 2021-12-23T21:52:06.45 0.6 undecidable manual S 358 22.6551 111 0.04 49
IV.EMPL.HHZ. 2021-12-23T21:52:06.31 0.3 undecidable manual S 11 22.1556 112 0.04 74
IT.LNT.HGZ. 2021-12-23T21:52:06.65 0.6 undecidable manual S 162 22.5552 111 0.24 47
IV.HVZN.HHZ. 2021-12-23T21:52:05.74 0.3 undecidable manual P 209 38.4282 50 0.12 71
IV.EPZF.HHZ. 2021-12-23T21:52:05.70 0.3 undecidable manual P 351 38.3283 50 0.09 71
IV.GALF.HHZ. 2021-12-23T21:52:05.76 0.3 undecidable manual P 309 40.3263 50 -0.16 70
IV.SSY.HHZ. 2021-12-23T21:52:05.30 0.1 undecidable manual P 160 38.3283 50 -0.32 90
IV.ESCV.HHZ. 2021-12-23T21:52:04.17 0.3 undecidable manual P 342 30.8469 106 -0.25 70
IV.ESML.HHZ. 2021-12-23T21:52:04.51 0.6 undecidable manual S 346 15.5733 119 0.32 47
IV.EPOZ.HHZ. 2021-12-23T21:52:04.56 0.3 undecidable manual P 48 31.3464 106 0.04 73
IV.ESVO.HHE. 2021-12-23T21:52:04.97 0.3 undecidable manual P 4 32.3454 50 0.28 69
IV.HLNI.HHZ. 2021-12-23T21:52:04.70 0.3 undecidable manual S 197 15.5733 119 0.52 67
IV.ESLN.HHZ. 2021-12-23T21:52:03.00 0.1 undecidable manual P 11 23.8539 110 -0.08 98
IV.HAGA.HHZ. 2021-12-23T21:52:03.85 0.1 undecidable manual P 137 29.9478 106 -0.39 90
IV.ESPC.HHN. 2021-12-23T21:52:02.82 0.3 undecidable manual P 21 25.0527 109 -0.49 67
IV.ECHR.HHE. 2021-12-23T21:52:02.82 0.1 undecidable manual P 358 22.6551 111 -0.04 99
IV.EMPL.HHZ. 2021-12-23T21:52:02.86 0.3 undecidable manual P 11 22.1556 112 0.09 73
IT.LNT.HGZ. 2021-12-23T21:52:02.64 0.3 undecidable manual P 162 22.5552 111 -0.21 71
IV.ESML.HHZ. 2021-12-23T21:52:01.21 0.3 undecidable manual P 346 15.5733 119 -0.36 70
IV.HLNI.HHZ. 2021-12-23T21:52:01.58 0.1 undecidable manual P 197 15.5733 119 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HLNI.HHN. ML:1.9 0.0007405 0.08 AML other m 2021-12-23T21:52:05.24
IV.HLNI.HHE. ML:1.9 0.000768 0.34 AML other m 2021-12-23T21:52:05.13
IV.HAGA.HHN. ML:1.6 0.0001785 0.58 AML other m 2021-12-23T21:52:09.67
IV.HAGA.HHE. ML:1.6 0.00021799999999999999 0.82 AML other m 2021-12-23T21:52:09.10
IV.ESML.HNE. ML:1.4 0.00025388215 0.1792 AML other m 2021-12-23T21:52:05.63
IV.ESML.HNN. ML:1.5 0.00032013370000000003 0.1792 AML other m 2021-12-23T21:52:04.84
IV.ESML.HHE. ML:1.5 0.00030385505000000003 0.1792 AML other m 2021-12-23T21:52:05.63
IV.ESML.HHN. ML:1.6 0.0003491225 0.1792 AML other m 2021-12-23T21:52:04.84
IV.EMPL.HHN. ML:2.5 0.0022072050000000003 0.2432 AML other m 2021-12-23T21:52:07.62
IV.EMPL.HHE. ML:2.3 0.0012728142500000002 0.3712 AML other m 2021-12-23T21:52:10.00
IV.ESCV.HHN. ML:1.9 0.00035694855 0.2688 AML other m 2021-12-23T21:52:13.29
IV.ESCV.HHE. ML:1.7 0.00024662845 0.2432 AML other m 2021-12-23T21:52:10.93
IV.EPOZ.HHN. ML:1.6 0.00016824140000000002 0.2304 AML other m 2021-12-23T21:52:10.83
IV.SSY.HHN. ML:2.2 0.00061298025 0.1408 AML other m 2021-12-23T21:52:14.94
IV.SSY.HNE. ML:1.6 0.00014717406499999998 0.128 AML other m 2021-12-23T21:52:14.32
IV.SSY.HHE. ML:1.8 0.0002030352 0.1024 AML other m 2021-12-23T21:52:12.56
IV.SSY.HNN. ML:1.7 0.0001925027 0.128 AML other m 2021-12-23T21:52:15.00
IV.EPZF.HHE. ML:1.8 0.00023549429999999999 0.32 AML other m 2021-12-23T21:52:15.27
IV.EPZF.HHN. ML:1.7 0.00018947115 0.32 AML other m 2021-12-23T21:52:14.50
IV.HVZN.HHE. ML:1.7 0.00017059655000000002 0.4224 AML other m 2021-12-23T21:52:15.97
IV.HVZN.HHN. ML:1.8 0.00024335334999999998 0.4608 AML other m 2021-12-23T21:52:19.26
IV.RAFF.HHN. ML:1.4 0.00006015956 0.4224 AML other m 2021-12-23T21:52:18.30
IV.RAFF.HHE. ML:1.4 0.000056089205000000005 0.2688 AML other m 2021-12-23T21:52:17.87
IV.HMDC.HHN. ML:1.7 0.00011149376 0.1152 AML other m 2021-12-23T21:52:20.56
IV.HMDC.HHE. ML:1.6 0.00008679403499999999 0.1024 AML other m 2021-12-23T21:52:18.41
IV.MCPD.HHE. ML:1.3 0.000028439815 0.4736 AML other m 2021-12-23T21:52:21.04
IV.MCPD.HHN. ML:1.2 0.00002314153 0.4736 AML other m 2021-12-23T21:52:21.68
IV.ISPIC.EHN. ML:1.9 0.00010911636999999999 0.2688 AML other m 2021-12-23T21:52:22.89
IV.ISPIC.HNN. ML:2.0 0.00014717649999999998 0.4352 AML other m 2021-12-23T21:52:27.57
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