Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 23-12-2021 and time 22:49:53 (UTC) in region 8 km SW Motta Sant'Anastasia (CT)

A magnitude ML 1.5 earthquake occured in region: 8 km SW Motta Sant'Anastasia (CT), on

  • 23-12-2021 22:49:53 (UTC)
  • 23-12-2021 23:49:53 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.4680, 14.9070 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 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 18 3924 544023
Tremestieri Etneo CT 19 20589 564612
Nicolosi CT 20 7463 572075
Biancavilla CT 20 24007 596082
Scordia CT 20 17095 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 1.5 2021-12-23
22:49:53		 37.4683 14.9068 9 2022-03-30
13:04:42		 Bollettino Sismico Italiano INGV 102535231
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-23 22:49:53 ± 0.07
Latitude 37.4683 ± 0.0036
Longitude 14.9068 ± 0.0102
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 102535231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 840
Semi-minor axis of confidence ellipse (meter) 327
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 86
Circular confidence region, given by single value of horizontal uncertainty (meter) 840.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 85
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.12321
Epicentral distance of station farthest from the epicenter (degree) 0.68708
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 102535231
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-29 16:04:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ISPIC.EHZ. 2021-12-23T22:50:17.29 0.6 undecidable manual S 180 76.2681 50 0.59 40
IV.HMDC.HNN. 2021-12-23T22:50:11.53 0.6 undecidable manual S 191 57.498 50 -0.16 46
IV.ISPIC.EHZ. 2021-12-23T22:50:06.63 0.3 undecidable manual P 180 76.2681 50 -0.21 66
IV.SSY.HHZ. 2021-12-23T22:50:06.70 0.6 undecidable manual S 157 37.4292 50 0.37 46
IV.HVZN.HHZ. 2021-12-23T22:50:05.63 0.6 undecidable manual S 208 36.3414 50 -0.4 46
IV.HAGA.HHZ. 2021-12-23T22:50:04.06 0.6 undecidable manual S 133 29.8479 107 -0.13 49
IV.HMDC.HNN. 2021-12-23T22:50:04.59 0.3 undecidable manual P 191 57.498 50 0.64 61
IV.RAFF.HHZ. 2021-12-23T22:50:03.11 0.1 undecidable manual P 241 55.2003 50 -0.49 87
IV.ESPC.HHN. 2021-12-23T22:50:03.18 0.6 undecidable manual S 23 27.0507 108 -0.08 50
IV.EMPL.HHZ. 2021-12-23T22:50:02.41 0.6 undecidable manual S 13 24.0537 110 0.14 49
IV.GALF.HHZ. 2021-12-23T22:50:01.35 0.3 undecidable manual P 312 40.2264 50 0.07 73
IV.EPZF.HHZ. 2021-12-23T22:50:01.53 0.3 undecidable manual P 354 39.7269 50 0.33 69
IV.HVZN.HHZ. 2021-12-23T22:50:00.57 0.3 undecidable manual P 208 36.3414 50 -0.11 73
IV.ECZM.HHN. 2021-12-23T22:50:00.13 0.6 undecidable manual P 360 29.1486 107 0.64 43
IV.SSY.HHZ. 2021-12-23T22:50:00.54 0.1 negative manual P 157 37.4292 50 -0.32 93
IV.EPOZ.HHZ. 2021-12-23T22:50:00.42 0.3 undecidable manual P 48 33.5442 50 0.17 72
IV.HAGA.HHZ. 2021-12-23T22:49:59.18 0.3 undecidable manual P 133 29.8479 107 -0.44 69
IV.HLNI.HHZ. 2021-12-23T22:49:59.62 0.6 undecidable manual S 193 13.6752 123 0.59 45
IV.ESCV.HHN. 2021-12-23T22:49:59.99 0.3 undecidable manual P 345 31.9458 50 -0.02 75
IV.ESML.HNE. 2021-12-23T22:49:59.34 0.6 undecidable manual S 352 16.7721 118 -0.63 44
IV.ESPC.HHN. 2021-12-23T22:49:58.69 0.3 undecidable manual P 23 27.0507 108 -0.4 70
IV.ESLN.HHZ. 2021-12-23T22:49:58.89 0.1 undecidable manual P 13 25.6521 109 0.07 100
IV.EMPL.HHZ. 2021-12-23T22:49:58.81 0.3 undecidable manual P 13 24.0537 110 0.3 71
IT.LNT.HGZ. 2021-12-23T22:49:57.98 0.3 undecidable manual P 157 21.6672 112 -0.09 75
IV.ESML.HNE. 2021-12-23T22:49:57.15 0.6 undecidable manual P 352 16.7721 118 -0.04 51
IV.HLNI.HHZ. 2021-12-23T22:49:56.80 0.1 undecidable manual P 193 13.6752 123 0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HLNI.HHN. ML:1.5 0.000321 0.12 AML other m 2021-12-23T22:49:59.96
IV.HLNI.HHE. ML:1.6 0.0004235 1.9 AML other m 2021-12-23T22:49:59.00
IV.EMPL.HHN. ML:1.6 0.00026962865 0.32 AML other m 2021-12-23T22:50:04.32
IV.EMPL.HHE. ML:1.5 0.000191 0.34 AML other m 2021-12-23T22:50:05.85
IV.SSY.HHN. ML:1.9 0.0003015 1.32 AML other m 2021-12-23T22:50:08.05
IV.SSY.HHE. ML:1.8 0.00022899999999999998 1.56 AML other m 2021-12-23T22:50:12.89
IV.SSY.HNN. ML:1.2 0.00006228782 0.1408 AML other m 2021-12-23T22:50:09.80
IV.SSY.HNE. ML:1.3 0.00007268803850000001 0.192 AML other m 2021-12-23T22:50:06.89
IV.HVZN.HHE. ML:1.2 0.000055787255000000004 0.5248 AML other m 2021-12-23T22:50:09.64
IV.HVZN.HHN. ML:1.3 0.000084349305 0.448 AML other m 2021-12-23T22:50:08.37
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