Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 29-04-2021 and time 18:13:09 (Italy) in region 3 km S Sant'Alfio (CT)

A magnitude ML 2.0 earthquake occured in region: 3 km S Sant'Alfio (CT), on

  • 29-04-2021 16:13:09 (UTC)
  • 29-04-2021 18:13:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.7220, 15.1520 at 18 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 3 1582 1582
Giarre CT 3 27659 29241
Milo CT 3 1087 30328
Santa Venerina CT 4 8592 38920
Riposto CT 5 14838 53758
Zafferana Etnea CT 5 9517 63275
Mascali CT 6 14282 77557
Fiumefreddo di Sicilia CT 10 9623 87180
Piedimonte Etneo CT 10 3963 91143
Acireale CT 12 52622 143765
Aci Sant'Antonio CT 13 17984 161749
Aci Catena CT 13 29851 191600
Trecastagni CT 13 10910 202510
Viagrande CT 13 8563 211073
Calatabiano CT 13 5308 216381
Linguaglossa CT 13 5403 221784
Pedara CT 14 14102 235886
Aci Bonaccorsi CT 14 3524 239410
Valverde CT 16 7840 247250
Nicolosi CT 16 7463 254713
Gaggi ME 17 3184 257897
San Giovanni la Punta CT 17 23060 280957
Giardini-Naxos ME 17 9415 290372
Tremestieri Etneo CT 18 20589 310961
San Gregorio di Catania CT 18 11966 322927
Castiglione di Sicilia CT 18 3215 326142
Aci Castello CT 18 18723 344865
Mascalucia CT 19 31958 376823
Taormina ME 19 10960 387783
Castelmola ME 19 1088 388871
Sant'Agata li Battiati CT 19 9479 398350
Gravina di Catania CT 19 25838 424188
Motta Camastra ME 20 845 425033
San Pietro Clarenza CT 20 7743 432776

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km N of Acireale (52622 inhabitants)
25 Km N of Catania (314555 inhabitants)
61 Km SW of Reggio di Calabria (183035 inhabitants)
64 Km SW of Messina (238439 inhabitants)
75 Km N of Siracusa (122291 inhabitants)
96 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 2.0 2021-04-29
16:13:09		 37.7217 15.1518 18 2021-07-12
16:55:16		 Bollettino Sismico Italiano INGV 91656501
Reviewed
Rev200 		ML 1.6 2021-04-29
16:13:09		 37.752 15.154 13 2021-06-21
12:55:21		 Sala Operativa INGV_OE (Catania) 89600611
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-29 16:13:09 ± 0.11
Latitude 37.7217 ± 0.0045
Longitude 15.1518 ± 0.0091
Depth (km) 18 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91656501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 712
Semi-minor axis of confidence ellipse (meter) 534
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 282
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) 116
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 38
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.03507
Epicentral distance of station farthest from the epicenter (degree) 0.76173
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 28
Type of magnitude ML
Reference to an origin 91656501
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-21 12:54:49

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations
Type of magnitude ML
Reference to an origin 89600611
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-04-29 16:31:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SSY.HHZ. 2021-04-29T16:13:29.71 0.6 undecidable manual S 186 62.9925 98 0.75 38
IV.HCRL.HHZ. 2021-04-29T16:13:26.05 0.6 undecidable manual S 192 49.8168 101 0.56 41
IV.HAGA.HHZ. 2021-04-29T16:13:25.63 0.6 undecidable manual S 180 48.4182 101 0.49 42
IV.HAVL.HHZ. 2021-04-29T16:13:23.77 0.3 undecidable manual P 182 84.5487 96 -0.31 61
IV.SSY.HHZ. 2021-04-29T16:13:20.76 0.3 undecidable manual P 186 62.9925 98 0 67
IV.HCRL.HHZ. 2021-04-29T16:13:18.68 0.1 undecidable manual P 192 49.8168 101 -0.08 91
IV.MUCR.HHZ. 2021-04-29T16:13:18.02 0.3 undecidable manual P 326 43.1235 103 0.26 67
IV.HLNI.HHZ. 2021-04-29T16:13:18.15 0.3 undecidable manual P 211 48.2184 101 -0.37 64
IV.HAGA.HHZ. 2021-04-29T16:13:18.22 0.3 undecidable manual P 180 48.4182 101 -0.34 65
IV.EMPL.HHZ. 2021-04-29T16:13:17.06 0.6 undecidable manual S 253 16.6722 129 -0.2 47
IV.ECTS.HHZ. 2021-04-29T16:13:17.70 0.6 undecidable manual S 351 17.9709 127 0.15 47
IV.ESLN.HHZ. 2021-04-29T16:13:16.88 0.6 undecidable manual S 259 15.873 131 -0.23 47
IV.EFIU.HHZ. 2021-04-29T16:13:16.04 0.6 undecidable manual S 34 9.0798 148 0.1 48
IV.EMFS.HHE. 2021-04-29T16:13:16.62 0.6 undecidable manual S 269 13.4754 136 -0.03 49
IV.ESPC.HHN. 2021-04-29T16:13:16.08 0.6 undecidable manual S 253 11.3775 142 -0.21 48
IV.EVRN.HHZ. 2021-04-29T16:13:15.78 0.6 undecidable manual S 202 3.8961 166 0.39 46
IV.EMFO.HHE. 2021-04-29T16:13:15.74 0.6 undecidable manual S 286 5.5944 160 0.21 48
IV.EPZF.HHZ. 2021-04-29T16:13:15.93 0.3 undecidable manual P 294 28.2495 112 0.37 67
IV.ECBD.HHN. 2021-04-29T16:13:15.74 0.6 undecidable manual S 319 8.6802 150 -0.14 49
IV.EMCN.HHN. 2021-04-29T16:13:15.90 0.6 undecidable manual S 307 12.876 138 -0.65 42
IV.ESAL.HHZ. 2021-04-29T16:13:15.24 0.6 undecidable manual S 338 3.996 165 -0.16 49
IV.AIO.HHZ. 2021-04-29T16:13:15.36 0.1 undecidable manual P 14 28.5492 112 -0.25 92
IV.EMNR.HHZ. 2021-04-29T16:13:14.14 0.1 undecidable manual P 314 15.2736 132 0.29 93
IV.EMSG.HHZ. 2021-04-29T16:13:14.96 0.1 undecidable manual P 302 20.868 122 0.42 90
IV.ECNE.HHN. 2021-04-29T16:13:14.34 0.3 undecidable manual P 290 13.9749 135 0.62 64
IV.EPOZ.HHZ. 2021-04-29T16:13:13.19 0.3 undecidable manual P 150 6.3936 157 0.14 73
IV.ECBD.HHN. 2021-04-29T16:13:13.20 0.1 undecidable manual P 319 8.6802 150 -0.01 100
IV.EMCN.HHN. 2021-04-29T16:13:13.73 0.3 undecidable manual P 307 12.876 138 0.13 72
IV.EMPL.HHZ. 2021-04-29T16:13:13.99 0.3 undecidable manual P 253 16.6722 129 -0.02 73
IV.ESPC.HHN. 2021-04-29T16:13:13.20 0.1 undecidable manual P 253 11.3775 142 -0.25 94
IV.ECTS.HHZ. 2021-04-29T16:13:13.98 0.1 undecidable manual P 351 17.9709 127 -0.2 95
IV.ESLN.HHZ. 2021-04-29T16:13:13.61 0.3 undecidable manual P 259 15.873 131 -0.32 69
IV.EPIT.HHZ. 2021-04-29T16:13:13.77 0.1 undecidable manual P 320 12.9759 138 0.17 96
IV.EMFS.HHE. 2021-04-29T16:13:13.51 0.1 undecidable manual P 269 13.4754 136 -0.15 96
IV.ESAL.HHZ. 2021-04-29T16:13:12.89 0.1 negative manual P 338 3.996 165 -0.05 100
IV.EVRN.HHZ. 2021-04-29T16:13:12.92 0.3 undecidable manual P 202 3.8961 166 -0.01 75
IV.EFIU.HHZ. 2021-04-29T16:13:12.95 0.3 undecidable manual P 34 9.0798 148 -0.3 71
IV.EMFO.HHE. 2021-04-29T16:13:12.94 0.1 undecidable manual P 286 5.5944 160 -0.07 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESAL.HHN. ML:2.0 0.0010965 0.96 AML other m 2021-04-29T16:13:15.38
IV.EVRN.HHN. ML:2.3 0.0017999999999999997 0.36 AML other m 2021-04-29T16:13:16.00
IV.EVRN.HNN. ML:2.5 0.00277 0.34 AML other m 2021-04-29T16:13:16.00
IV.EVRN.HNE. ML:2.4 0.00237 0.84 AML other m 2021-04-29T16:13:16.13
IV.EVRN.HHE. ML:2.5 0.0029950000000000003 0.26 AML other m 2021-04-29T16:13:16.14
IV.ESAL.HHE. ML:2.3 0.0018849999999999997 0.22 AML other m 2021-04-29T16:13:16.24
IV.EFIU.HHE. ML:1.8 0.0005295000000000001 0.86 AML other m 2021-04-29T16:13:16.55
IV.EFIU.HHN. ML:1.9 0.0005985000000000001 0.38 AML other m 2021-04-29T16:13:16.66
IV.EMPL.HHE. ML:2.1 0.000823 0.5 AML other m 2021-04-29T16:13:18.83
IV.EPOZ.HHN. ML:1.8 0.000616 0.32 AML other m 2021-04-29T16:13:18.89
IV.EMPL.HHN. ML:2.3 0.00131 0.2 AML other m 2021-04-29T16:13:19.10
IV.EPIT.HHN. ML:2.2 0.001245 0.38 AML other m 2021-04-29T16:13:19.20
IV.EPOZ.HHE. ML:1.8 0.000608 0.28 AML other m 2021-04-29T16:13:19.92
IV.HCRL.HHN. ML:1.5 0.00007335 0.42 AML other m 2021-04-29T16:13:20.55
IV.EPIT.HHE. ML:1.9 0.000666 1.6 AML other m 2021-04-29T16:13:20.92
IV.AIO.HHE. ML:1.7 0.000245 0.22 AML other m 2021-04-29T16:13:21.44
IV.AIO.HHN. ML:1.5 0.0001475 0.22 AML other m 2021-04-29T16:13:21.61
IV.EPZF.HHE. ML:1.7 0.000215 0.32 AML other m 2021-04-29T16:13:24.31
IV.EPZF.HHN. ML:1.8 0.0002935 0.32 AML other m 2021-04-29T16:13:24.44
IV.EMSG.HHE. ML:1.8 0.0003795 0.2 AML other m 2021-04-29T16:13:24.51
IV.EMSG.HHN. ML:1.8 0.000364 0.82 AML other m 2021-04-29T16:13:25.54
IV.HLNI.HHN. ML:1.3 0.00004755 0.56 AML other m 2021-04-29T16:13:27.88
IV.HLNI.HHE. ML:1.3 0.00005185 1.48 AML other m 2021-04-29T16:13:27.83
IV.HCRL.HHE. ML:1.4 0.0000644 0.52 AML other m 2021-04-29T16:13:30.89
IV.SSY.HHE. ML:2.0 0.00019700000000000002 1.04 AML other m 2021-04-29T16:13:31.58
IV.SSY.HHN. ML:2.5 0.000631 1.5 AML other m 2021-04-29T16:13:34.75
IV.HAVL.HHN. ML:2.2 0.0001835 0.44 AML other m 2021-04-29T16:13:36.58
IV.HAVL.HHE. ML:2.1 0.00014700000000000002 1.68 AML other m 2021-04-29T16:13:36.07
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