Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.4 on date 31-12-2021 and time 10:56:44 (Italy) in region 5 km NW Troina (EN)

A magnitude ML 2.4 earthquake occured in region: 5 km NW Troina (EN), on

  • 31-12-2021 09:56:44 (UTC)
  • 31-12-2021 10:56:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.8270, 14.5730 at 36 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
Troina EN 5 9373 9373
Cerami EN 6 2006 11379
Capizzi ME 9 3176 14555
San Teodoro ME 11 1403 15958
Cesarò ME 13 2439 18397
Gagliano Castelferrato EN 13 3593 21990
Nicosia EN 18 13899 35889
Agira EN 19 8345 44234

Municipalities with at least 50000 inhabitants

An earthquake occurred to
57 Km W of Acireale (52622 inhabitants)
58 Km NW of Catania (314555 inhabitants)
58 Km NE of Caltanissetta (63360 inhabitants)
89 Km NE of Gela (75827 inhabitants)
95 Km W of Messina (238439 inhabitants)
97 Km E of Bagheria (55387 inhabitants)
98 Km N of Vittoria (63339 inhabitants)
99 Km W of Reggio di Calabria (183035 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 2.4 2021-12-31
09:56:44		 37.8272 14.5728 36 2022-03-30
13:04:31		 Bollettino Sismico Italiano INGV 99884581
Reviewed
Rev100 		ML 2.4 2021-12-31
09:56:43		 37.8908 14.5748 38 2021-12-31
10:04:14		 Sala Sismica INGV-Roma 99189111
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-31 09:56:44 ± 0.08
Latitude 37.8272 ± 0.0072
Longitude 14.5728 ± 0.0068
Depth (km) 36 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99884581

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 752
Semi-minor axis of confidence ellipse (meter) 535
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 182
Circular confidence region, given by single value of horizontal uncertainty (meter) 750.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 51
Number of associated phases, regardless of their use for origin computation 55
Number of defining phases 45
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.85615
Number of stations at which the event was observed 47
Number of stations from which data was used for origin computation 37
Magnitudes information

ML:2.4

Field Value
Value 2.4
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 99884581
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-17 16:16:06

ML:2.4

Field Value
Value 2.4
Uncertainty 0.3
Num. used stations 36
Type of magnitude ML
Reference to an origin 99189111
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-31 10:04:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.LPEL.HHZ. 2021-12-31T09:58:30.12 3.0 undecidable manual Sg -2.52 0
IV.NARO.HHZ. 2021-12-31T09:58:08.92 3.0 positive manual Pg 0.5 0
IV.PP3.EHZ. 2021-12-31T09:58:07.55 3.0 positive manual Pg 4.18 0
IV.GAVE.EHZ. 2021-12-31T09:58:03.02 3.0 undecidable manual Pg 7.59 0
IV.SSFR.HHZ. 2021-12-31T09:57:58.54 3.0 positive manual Pn -7.07 0
IV.CDRU.HHZ. 2021-12-31T09:57:43.48 3.0 undecidable manual Sn -9.99 0
OT.OT17.EHZ. 2021-12-31T09:57:42.13 3.0 negative manual Pg 1.47 0
IV.GIZZ.HHZ. 2021-12-31T09:57:38.74 3.0 undecidable manual Sg 4.17 0
IV.TDS.HHZ. 2021-12-31T09:57:18.55 3.0 undecidable manual Pg -0.92 0
IV.ECTS.HHZ. 2021-12-31T09:57:02.40 0.6 undecidable manual S 83 48.4182 123 0.25 50
IV.MSRU.HHZ. 2021-12-31T09:57:01.21 0.6 undecidable manual P 59 95.0382 54 0.32 45
IV.EMFO.HHE. 2021-12-31T09:57:01.60 0.6 undecidable manual S 102 46.5201 124 -0.12 51
IV.ESPC.HHN. 2021-12-31T09:57:00.80 0.6 undecidable manual S 110 42.5241 127 -0.07 52
IV.IFIL.HHN. 2021-12-31T09:56:59.13 1.0 undecidable manual P 0 81.7515 54 -0.11 24
IV.SSY.HHZ. 2021-12-31T09:56:59.50 1.0 negative manual P 149 86.3469 54 -0.31 23
IV.ESVO.HHE. 2021-12-31T09:56:59.00 0.6 undecidable manual S 100 33.3444 134 0.01 54
IV.ILOS.HHN. 2021-12-31T09:56:58.80 0.6 undecidable manual P 25 76.0683 54 0.27 47
3D.OEM4.HHN. 2021-12-31T09:56:58.26 0.6 undecidable manual P 26 72.1722 54 0.21 48
IV.HVZN.HHZ. 2021-12-31T09:56:58.19 1.0 undecidable manual P 170 73.0713 54 0.04 25
IV.HAGA.HHZ. 2021-12-31T09:56:58.18 0.6 undecidable manual P 139 78.9654 54 -0.71 41
3D.OEM8.HHN. 2021-12-31T09:56:58.28 1.0 undecidable manual P 23 77.2671 54 -0.4 23
IV.IACL.HHE. 2021-12-31T09:56:58.89 0.6 undecidable manual P 346 80.5638 54 -0.2 48
IV.ECZM.HHN. 2021-12-31T09:56:58.80 0.6 undecidable manual S 110 30.9468 136 0.27 51
IV.IVPL.HNE. 2021-12-31T09:56:58.03 0.6 undecidable manual P 30 70.5738 113 0.22 48
IV.MPNC.HHZ. 2021-12-31T09:56:58.33 1.0 undecidable manual P 62 76.8675 54 -0.3 23
IV.EPZF.HHZ. 2021-12-31T09:56:57.50 0.6 undecidable manual S 91 24.8529 143 0.01 55
IV.IVUG.HHZ. 2021-12-31T09:56:57.80 0.6 undecidable manual P 30 72.6717 54 -0.31 47
3D.OEM9.HNE. 2021-12-31T09:56:57.88 1.0 undecidable manual P 30 72.0723 112 -0.16 24
IV.RAFF.HHZ. 2021-12-31T09:56:57.91 1.0 undecidable manual P 195 69.5748 113 0.23 24
IV.HLNI.HHZ. 2021-12-31T09:56:56.50 1.0 undecidable manual P 154 59.2962 117 0.26 24
IV.MSFR.HHZ. 2021-12-31T09:56:56.60 0.6 undecidable manual S 4 22.9548 145 -0.59 48
IV.AIO.HHZ. 2021-12-31T09:56:56.59 0.3 undecidable manual P 74 59.9955 117 0.26 73
IV.GIB.HHE. 2021-12-31T09:56:55.66 0.6 undecidable manual P 291 51.2154 121 0.51 46
IV.EPOZ.HHZ. 2021-12-31T09:56:55.75 1.0 undecidable manual P 107 56.6988 118 -0.14 25
IV.GALF.HHZ. 2021-12-31T09:56:55.50 0.6 undecidable manual S 182 12.876 159 -0.42 52
IV.RESU.HHZ. 2021-12-31T09:56:54.61 1.0 undecidable manual P 246 49.5171 122 -0.32 25
IV.PLLN.EHN. 2021-12-31T09:56:54.41 0.6 undecidable manual P 296 41.8248 127 0.45 48
IV.ECBD.HHN. 2021-12-31T09:56:54.70 0.6 undecidable manual P 96 45.3213 125 0.31 50
IV.ECTS.HHZ. 2021-12-31T09:56:54.68 1.0 undecidable manual P 83 48.4182 123 -0.11 26
IV.SCIAC.HHZ. 2021-12-31T09:56:54.77 3.0 negative manual P -8.51 0
IV.EMNR.HHZ. 2021-12-31T09:56:54.00 0.6 undecidable manual P 92 39.7269 129 0.3 50
IV.EMCN.HHN. 2021-12-31T09:56:54.18 1.0 undecidable manual P 95 40.5261 128 0.38 25
IV.EPIT.HHN. 2021-12-31T09:56:54.47 1.0 undecidable manual P 92 42.4242 127 0.44 24
IV.EMFO.HHE. 2021-12-31T09:56:54.17 0.6 undecidable manual P 102 46.5201 124 -0.37 49
IV.CSLB.HHZ. 2021-12-31T09:56:54.78 0.1 undecidable manual P 285 46.7199 124 0.21 100
IV.ESLN.HHZ. 2021-12-31T09:56:53.89 1.0 undecidable manual P 113 38.2284 130 0.37 25
IV.ECHR.HHE. 2021-12-31T09:56:53.57 1.0 undecidable manual P 118 33.6441 134 0.57 24
IV.ESVO.HHE. 2021-12-31T09:56:53.35 1.0 undecidable manual P 100 33.3444 134 0.39 25
IV.EMPL.HHZ. 2021-12-31T09:56:53.87 0.6 undecidable manual P 115 38.5281 130 0.31 50
IV.ESPC.HHN. 2021-12-31T09:56:53.73 0.6 undecidable manual P 110 42.5241 127 -0.32 50
IV.ECZM.HHN. 2021-12-31T09:56:52.67 1.0 undecidable manual P 110 30.9468 136 -0.03 27
IV.MUCR.HHZ. 2021-12-31T09:56:52.70 0.3 undecidable manual P 48 35.6421 132 -0.52 72
IV.EPZF.HHZ. 2021-12-31T09:56:52.08 0.3 undecidable manual P 91 24.8529 143 -0.02 82
IV.MSFR.HHZ. 2021-12-31T09:56:51.41 0.6 undecidable manual P 4 22.9548 145 -0.51 49
IV.GALF.HHZ. 2021-12-31T09:56:50.80 0.6 undecidable manual P 182 12.876 159 -0.39 52
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GALF.HHE. ML:2.6 0.0016284515000000001 1.0784 AML other m 2021-12-31T09:56:56.33
IV.GALF.HHN. ML:2.4 0.0010215 0.28 AML other m 2021-12-31T09:56:56.84
IV.EPZF.HHE. ML:2.2 0.0005560000000000001 0.64 AML other m 2021-12-31T09:56:58.64
IV.MUCR.HHE. ML:2.4 0.0006333651 0.256 AML other m 2021-12-31T09:56:58.77
IV.MUCR.HHN. ML:2.2 0.00045049065 1.2992 AML other m 2021-12-31T09:56:59.47
IV.EPZF.HHN. ML:2.4 0.0007963104999999999 0.3648 AML other m 2021-12-31T09:57:02.81
IV.EMPL.HHE. ML:2.4 0.00060806875 1.1008 AML other m 2021-12-31T09:57:02.15
IV.EPOZ.HNN. ML:2.1 0.00024501408 0.096 AML other m 2021-12-31T09:57:06.38
IV.AIO.HHE. ML:2.6 0.000618 0.5 AML other m 2021-12-31T09:57:06.60
IV.EMPL.HHN. ML:2.6 0.0009603924 2.4576 AML other m 2021-12-31T09:57:03.46
IV.AIO.HHN. ML:2.4 0.0004117968 0.4992 AML other m 2021-12-31T09:57:06.60
IV.EPOZ.HHN. ML:2.4 0.00049859125 0.5952 AML other m 2021-12-31T09:57:06.44
IV.EPOZ.HNE. ML:1.9 0.000139853476 0.064 AML other m 2021-12-31T09:57:08.44
IV.EPOZ.HHE. ML:2.4 0.0004112288 0.96 AML other m 2021-12-31T09:57:07.06
IV.HVZN.HHE. ML:2.6 0.0005105 1.54 AML other m 2021-12-31T09:57:11.81
IV.RAFF.HHE. ML:2.1 0.00019975635 1.9776 AML other m 2021-12-31T09:57:09.53
IV.RAFF.HHN. ML:2.3 0.00026128785 0.6592 AML other m 2021-12-31T09:57:11.58
IV.MPNC.HHE. ML:2.3 0.00027213845000000005 0.4608 AML other m 2021-12-31T09:57:12.07
IV.HVZN.HHN. ML:2.4 0.0003190609 1.5744 AML other m 2021-12-31T09:57:11.47
IV.MPNC.HHN. ML:2.3 0.00027116875 0.5632 AML other m 2021-12-31T09:57:11.91
IV.MSRU.HHE. ML:2.4 0.0002551696 0.64 AML other m 2021-12-31T09:57:15.84
IV.MSRU.HHN. ML:2.3 0.00019136524999999999 1.6384 AML other m 2021-12-31T09:57:15.30
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
Waveforms Seismic signals in miniseed + resp format Download