Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.2 on date 24-01-2021 and time 11:17:27 (Italy) in region 1 km S Sant'Alfio (CT)

A magnitude ML 2.2 earthquake occured in region: 1 km S Sant'Alfio (CT), on

  • 24-01-2021 10:17:27 (UTC)
  • 24-01-2021 11:17:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7340, 15.1450 at 20 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
Sant'Alfio CT 1 1582 1582
Milo CT 3 1087 2669
Giarre CT 4 27659 30328
Santa Venerina CT 5 8592 38920
Mascali CT 5 14282 53202
Riposto CT 5 14838 68040
Zafferana Etnea CT 6 9517 77557
Fiumefreddo di Sicilia CT 9 9623 87180
Piedimonte Etneo CT 9 3963 91143
Linguaglossa CT 12 5403 96546
Calatabiano CT 13 5308 101854
Acireale CT 14 52622 154476
Trecastagni CT 14 10910 165386
Aci Sant'Antonio CT 14 17984 183370
Viagrande CT 14 8563 191933
Aci Catena CT 15 29851 221784
Pedara CT 15 14102 235886
Aci Bonaccorsi CT 15 3524 239410
Gaggi ME 16 3184 242594
Giardini-Naxos ME 17 9415 252009
Nicolosi CT 17 7463 259472
Castiglione di Sicilia CT 17 3215 262687
Valverde CT 17 7840 270527
San Giovanni la Punta CT 18 23060 293587
Taormina ME 18 10960 304547
Castelmola ME 18 1088 305635
Motta Camastra ME 18 845 306480
Tremestieri Etneo CT 19 20589 327069
Francavilla di Sicilia ME 19 3945 331014
San Gregorio di Catania CT 19 11966 342980
Graniti ME 19 1492 344472
Mascalucia CT 20 31958 376430
Aci Castello CT 20 18723 395153

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km N of Acireale (52622 inhabitants)
26 Km N of Catania (314555 inhabitants)
61 Km SW of Reggio di Calabria (183035 inhabitants)
63 Km SW of Messina (238439 inhabitants)
76 Km N of Siracusa (122291 inhabitants)
97 Km NE of Ragusa (73313 inhabitants)
99 Km E of Caltanissetta (63360 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 2.2 2021-01-24
10:17:27		 37.734 15.1447 20 2021-07-12
16:55:14		 Bollettino Sismico Italiano INGV 91138671
Reviewed
Rev200 		ML 1.8 2021-01-24
10:17:27		 37.744 15.093 14 2021-06-12
06:36:25		 Sala Operativa INGV_OE (Catania) 86526981
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-24 10:17:27 ± 0.18
Latitude 37.7340 ± 0.0063
Longitude 15.1447 ± 0.0171
Depth (km) 20 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91138671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1502
Semi-minor axis of confidence ellipse (meter) 305
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 268
Circular confidence region, given by single value of horizontal uncertainty (meter) 1500.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 40
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.02248
Epicentral distance of station farthest from the epicenter (degree) 0.82648
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.4
Num. used stations 19
Type of magnitude ML
Reference to an origin 91138671
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-12 06:35:22

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 86526981
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-01-24 10:28:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HMDC.HHN. 2021-01-24T10:17:55.33 0.6 undecidable manual S 200 91.7415 96 0.83 34
IV.HAVL.HHZ. 2021-01-24T10:17:53.76 0.6 undecidable manual S 181 85.9473 97 0.79 35
IV.SSY.HHN. 2021-01-24T10:17:48.43 0.3 undecidable manual S 186 64.1913 100 1.19 45
IV.HLNI.HHZ. 2021-01-24T10:17:43.09 0.6 undecidable manual S 209 49.0176 103 -0.17 45
IV.HAGA.HHN. 2021-01-24T10:17:43.53 0.6 undecidable manual S 179 49.8168 103 0.07 46
IV.HCRL.HHZ. 2021-01-24T10:17:43.98 0.6 undecidable manual S 191 51.0156 103 0.22 45
IV.HMDC.HHN. 2021-01-24T10:17:42.95 0.3 undecidable manual P 200 91.7415 96 -0.11 63
IV.HAVL.HHZ. 2021-01-24T10:17:41.67 0.3 undecidable manual P 181 85.9473 97 -0.51 59
IV.SSY.HHN. 2021-01-24T10:17:39.55 0.3 undecidable manual P 186 64.1913 100 0.68 57
IV.AIO.HHN. 2021-01-24T10:17:38.69 0.6 undecidable manual S 16 27.4503 117 0.88 37
IV.HLNI.HHZ. 2021-01-24T10:17:36.08 0.3 undecidable manual P 209 49.0176 103 -0.49 63
IV.HAGA.HHN. 2021-01-24T10:17:36.16 0.3 undecidable manual P 179 49.8168 103 -0.53 63
IV.HCRL.HHZ. 2021-01-24T10:17:36.53 0.3 undecidable manual P 191 51.0156 103 -0.33 65
IV.ENIC.HHE. 2021-01-24T10:17:35.44 0.6 undecidable manual S 224 15.6732 135 0.18 48
IV.EPIT.HHN. 2021-01-24T10:17:35.46 0.6 undecidable manual S 318 11.5773 145 0.91 39
IV.ECTS.HHN. 2021-01-24T10:17:35.44 0.6 undecidable manual S 353 16.5723 134 0.01 49
IV.EMNR.HHZ. 2021-01-24T10:17:35.95 0.6 undecidable manual S 311 13.875 139 1.01 37
IV.EPZF.HHZ. 2021-01-24T10:17:34.04 0.3 undecidable manual P 292 27.1506 117 0.65 62
IV.EFIU.HHE. 2021-01-24T10:17:34.17 0.6 undecidable manual S 43 8.3805 153 0.04 50
IV.EPOZ.HHE. 2021-01-24T10:17:34.72 0.6 undecidable manual S 151 7.881 155 0.65 42
IV.ESLN.HHE. 2021-01-24T10:17:34.61 0.6 undecidable manual S 253 15.5733 136 -0.64 41
IV.EMFO.HHE. 2021-01-24T10:17:33.28 0.6 undecidable manual S 272 4.7952 164 -0.49 45
IV.EVRN.HHE. 2021-01-24T10:17:33.68 0.3 undecidable manual S 189 4.995 164 -0.11 74
IV.AIO.HHN. 2021-01-24T10:17:33.57 0.1 undecidable manual P 16 27.4503 117 0.14 94
IV.ESAL.HHE. 2021-01-24T10:17:33.77 0.6 undecidable manual S 339 2.4975 172 0.12 50
IV.ECBD.HHN. 2021-01-24T10:17:33.60 0.6 undecidable manual S 315 7.1928 157 -0.39 46
IV.ESPC.HHN. 2021-01-24T10:17:33.87 0.6 undecidable manual S 246 11.2776 146 -0.64 42
IV.EMNR.HHZ. 2021-01-24T10:17:32.14 0.3 undecidable manual P 311 13.875 139 0.37 69
IV.ENIC.HHE. 2021-01-24T10:17:32.16 0.6 positive manual P 224 15.6732 135 0.2 48
IV.ECTS.HHN. 2021-01-24T10:17:31.76 0.3 undecidable manual P 353 16.5723 134 -0.29 70
IV.ECBD.HHN. 2021-01-24T10:17:31.25 0.1 undecidable manual P 315 7.1928 157 0.03 100
IV.EPOZ.HHE. 2021-01-24T10:17:31.14 0.3 undecidable manual P 151 7.881 155 -0.12 74
IV.ESLN.HHE. 2021-01-24T10:17:31.75 0.3 undecidable manual P 253 15.5733 136 -0.2 71
IV.ESPC.HHN. 2021-01-24T10:17:31.06 0.1 undecidable manual P 246 11.2776 146 -0.46 90
IV.EPIT.HHN. 2021-01-24T10:17:31.67 0.3 undecidable manual P 318 11.5773 145 0.13 73
IV.EMCN.HHN. 2021-01-24T10:17:31.75 1.0 undecidable manual P 303 11.5773 145 0.2 24
IV.EFIU.HHE. 2021-01-24T10:17:30.95 0.3 undecidable manual P 43 8.3805 153 -0.35 71
IV.EMFO.HHE. 2021-01-24T10:17:30.80 0.1 undecidable manual P 272 4.7952 164 -0.3 95
IV.EVRN.HHE. 2021-01-24T10:17:30.86 0.1 undecidable manual P 189 4.995 164 -0.25 96
IV.ESAL.HHE. 2021-01-24T10:17:30.79 0.1 undecidable manual P 339 2.4975 172 -0.23 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EVRN.HHN. ML:2.7 0.00425 0.16 AML other m 2021-01-24T10:17:33.91
IV.EVRN.HNN. ML:2.8 0.00534 0.18 AML other m 2021-01-24T10:17:33.92
IV.EVRN.HHE. ML:2.8 0.00555 1.2 AML other m 2021-01-24T10:17:33.95
IV.EVRN.HNE. ML:2.7 0.00451 1.22 AML other m 2021-01-24T10:17:33.96
IV.EPOZ.HHN. ML:0.0 0.00097489295 0.3008 AML other m 2021-01-24T10:17:36.33
IV.EPOZ.HHE. ML:2.0 0.00080441765 0.16 AML other m 2021-01-24T10:17:36.85
IV.AIO.HHN. ML:1.6 0.00016883874999999997 0.3776 AML other m 2021-01-24T10:17:41.21
IV.AIO.HHE. ML:1.6 0.000167 0.62 AML other m 2021-01-24T10:17:39.40
IV.HCRL.HHN. ML:1.6 0.000083589785 0.3008 AML other m 2021-01-24T10:17:44.27
IV.HCRL.HHE. ML:1.9 0.0001875 0.44 AML other m 2021-01-24T10:17:45.44
IV.ENIC.HHE. ML:2.3 0.00136147785 0.2368 AML other m 2021-01-24T10:17:37.32
IV.ENIC.HHN. ML:2.2 0.0009782118 0.1984 AML other m 2021-01-24T10:17:37.71
IV.ENIC.HNN. ML:2.3 0.0012175723 0.2624 AML other m 2021-01-24T10:17:39.75
IV.ENIC.HNE. ML:2.4 0.0016822362499999998 0.192 AML other m 2021-01-24T10:17:37.33
IV.HLNI.HHE. ML:1.4 0.000060034777 0.1024 AML other m 2021-01-24T10:17:44.75
IV.HLNI.HHN. ML:1.4 0.0000550428555 0.16 AML other m 2021-01-24T10:17:45.50
IV.SSY.HHN. ML:2.3 0.00037375539999999995 0.224 AML other m 2021-01-24T10:17:52.68
IV.HAVL.HHE. ML:2.2 0.00017080575 0.1152 AML other m 2021-01-24T10:17:54.00
IV.HAVL.HHN. ML:2.3 0.0002260095 0.2816 AML other m 2021-01-24T10:17:54.00
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