Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.2 on date 30-04-2021 and time 06:34:31 (Italy) in region 2 km S Sant'Alfio (CT)

A magnitude ML 2.2 earthquake occured in region: 2 km S Sant'Alfio (CT), on

  • 30-04-2021 04:34:31 (UTC)
  • 30-04-2021 06:34:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.7270, 15.1420 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 2 1582 1582
Milo CT 2 1087 2669
Giarre CT 4 27659 30328
Santa Venerina CT 4 8592 38920
Zafferana Etnea CT 5 9517 48437
Riposto CT 6 14838 63275
Mascali CT 6 14282 77557
Fiumefreddo di Sicilia CT 10 9623 87180
Piedimonte Etneo CT 10 3963 91143
Linguaglossa CT 13 5403 96546
Acireale CT 13 52622 149168
Calatabiano CT 13 5308 154476
Trecastagni CT 13 10910 165386
Viagrande CT 13 8563 173949
Aci Sant'Antonio CT 13 17984 191933
Aci Catena CT 14 29851 221784
Pedara CT 14 14102 235886
Aci Bonaccorsi CT 15 3524 239410
Nicolosi CT 16 7463 246873
Valverde CT 16 7840 254713
Gaggi ME 17 3184 257897
San Giovanni la Punta CT 17 23060 280957
Giardini-Naxos ME 18 9415 290372
Castiglione di Sicilia CT 18 3215 293587
Tremestieri Etneo CT 18 20589 314176
San Gregorio di Catania CT 18 11966 326142
Mascalucia CT 19 31958 358100
Taormina ME 19 10960 369060
Aci Castello CT 19 18723 387783
Castelmola ME 19 1088 388871
Motta Camastra ME 19 845 389716
Sant'Agata li Battiati CT 19 9479 399195
Francavilla di Sicilia ME 20 3945 403140
Gravina di Catania CT 20 25838 428978
San Pietro Clarenza CT 20 7743 436721
Graniti ME 20 1492 438213

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 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 2.2 2021-04-30
04:34:31		 37.7267 15.1422 20 2021-07-12
16:55:10		 Bollettino Sismico Italiano INGV 89967291
Reviewed
Rev200 		ML 1.6 2021-04-30
04:34:32		 37.741 15.132 12 2021-06-30
10:00:24		 Sala Operativa INGV_OE (Catania) 89618841
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-30 04:34:31 ± 0.24
Latitude 37.7267 ± 0.0099
Longitude 15.1422 ± 0.0125
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 89967291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1167
Semi-minor axis of confidence ellipse (meter) 806
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 139
Circular confidence region, given by single value of horizontal uncertainty (meter) 1170.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 105
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.02878
Epicentral distance of station farthest from the epicenter (degree) 0.30127
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 89967291
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-30 10:00:04

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations
Type of magnitude ML
Reference to an origin 89618841
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-04-30 04:41:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NOV.HHZ. 2021-04-30T04:34:44.46 0.6 undecidable manual S 359 33.4443 111 0.8 40
IV.AIO.HHE. 2021-04-30T04:34:42.75 0.6 undecidable manual S 16 28.2495 116 0.35 46
IV.ECTS.HHZ. 2021-04-30T04:34:39.72 0.3 undecidable manual S 354 17.3715 132 -0.23 71
IV.EPOZ.HHZ. 2021-04-30T04:34:39.21 0.3 undecidable manual S 146 7.2927 156 0.85 59
IV.EPIT.HHZ. 2021-04-30T04:34:39.75 0.6 undecidable manual S 321 11.9769 143 0.76 41
IV.EMPL.HHZ. 2021-04-30T04:34:39.09 0.6 undecidable manual S 251 15.9729 134 -0.6 44
IV.ESPC.HHN. 2021-04-30T04:34:38.32 0.6 undecidable manual S 249 10.7781 147 -0.48 46
IV.EMFO.HHE. 2021-04-30T04:34:38.26 0.6 undecidable manual S 282 4.6953 165 0.14 50
IV.EPZF.HHZ. 2021-04-30T04:34:38.21 0.3 undecidable manual P 293 27.2505 117 0.41 68
IV.EFIU.HHZ. 2021-04-30T04:34:38.59 0.6 undecidable manual S 41 9.1797 151 0.01 51
IV.NOV.HHZ. 2021-04-30T04:34:38.79 0.3 undecidable manual P 359 33.4443 111 0.12 72
IV.EVRN.HHZ. 2021-04-30T04:34:38.17 0.3 undecidable manual S 188 4.1958 166 0.08 75
IV.ESAL.HHE. 2021-04-30T04:34:37.68 0.3 undecidable manual S 348 3.1968 169 -0.35 72
IV.ENIC.HHE. 2021-04-30T04:34:37.11 0.3 undecidable manual P 225 14.9739 136 0.84 58
IV.ECZM.HHN. 2021-04-30T04:34:37.17 0.6 undecidable manual P 271 20.868 125 0.21 48
IV.EMSG.HHZ. 2021-04-30T04:34:37.29 0.3 undecidable manual P 302 19.869 127 0.46 68
IV.AIO.HHE. 2021-04-30T04:34:37.69 0.1 undecidable manual P 16 28.2495 116 -0.25 93
IV.EPIT.HHZ. 2021-04-30T04:34:36.15 0.1 negative manual P 321 11.9769 143 0.18 98
IV.EMNR.HHZ. 2021-04-30T04:34:36.43 0.3 undecidable manual P 314 14.2746 138 0.24 72
IV.EMPL.HHZ. 2021-04-30T04:34:36.18 0.3 undecidable manual P 251 15.9729 134 -0.2 73
IV.EMCN.HHN. 2021-04-30T04:34:36.09 0.1 undecidable manual P 307 11.877 144 0.13 99
IV.ECTS.HHZ. 2021-04-30T04:34:36.23 0.1 undecidable manual P 354 17.3715 132 -0.3 94
IV.EMFS.HHE. 2021-04-30T04:34:35.60 0.3 undecidable manual P 266 12.6762 142 -0.44 69
IV.EVRN.HHZ. 2021-04-30T04:34:35.36 0.3 undecidable manual P 188 4.1958 166 -0.09 76
IV.ESAL.HHE. 2021-04-30T04:34:35.19 0.1 undecidable manual P 348 3.1968 169 -0.23 98
IV.ESPC.HHN. 2021-04-30T04:34:35.55 0.1 undecidable manual P 249 10.7781 147 -0.31 96
IV.EMFO.HHE. 2021-04-30T04:34:35.29 0.1 undecidable manual P 282 4.6953 165 -0.18 99
IV.ECBD.HHN. 2021-04-30T04:34:35.54 0.1 undecidable manual P 321 7.6812 155 -0.09 100
IV.EPOZ.HHZ. 2021-04-30T04:34:35.52 0.3 undecidable manual P 146 7.2927 156 -0.09 76
IV.EFIU.HHZ. 2021-04-30T04:34:35.33 0.1 positive manual P 41 9.1797 151 -0.41 93
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EVRN.HHN. ML:2.5 0.002455 0.16 AML other m 2021-04-30T04:34:38.37
IV.EVRN.HNN. ML:2.7 0.0039000000000000003 0.26 AML other m 2021-04-30T04:34:38.37
IV.EVRN.HHE. ML:2.8 0.0050999999999999995 0.8 AML other m 2021-04-30T04:34:38.50
IV.EVRN.HNE. ML:2.7 0.0041400000000000005 0.82 AML other m 2021-04-30T04:34:38.50
IV.EFIU.HHE. ML:1.8 0.0005885 1.12 AML other m 2021-04-30T04:34:38.91
IV.EFIU.HHN. ML:2.0 0.000882 1.62 AML other m 2021-04-30T04:34:39.03
IV.EPOZ.HHE. ML:2.0 0.0008215 1.42 AML other m 2021-04-30T04:34:39.82
IV.ECTS.HHE. ML:2.5 0.001785 0.34 AML other m 2021-04-30T04:34:40.31
IV.EMPL.HHE. ML:2.1 0.00080756515 0.8192 AML other m 2021-04-30T04:34:40.16
IV.ECTS.HHN. ML:2.2 0.0009115 0.98 AML other m 2021-04-30T04:34:40.28
IV.EPOZ.HHN. ML:2.0 0.0008575 1.18 AML other m 2021-04-30T04:34:41.65
IV.EMPL.HHN. ML:2.3 0.0012749999999999999 0.2 AML other m 2021-04-30T04:34:41.54
IV.EPIT.HHN. ML:2.4 0.00165 0.36 AML other m 2021-04-30T04:34:41.55
IV.EPIT.HHE. ML:2.2 0.00124 1.72 AML other m 2021-04-30T04:34:42.07
IV.EPZF.HHN. ML:2.0 0.00039400000000000004 0.5 AML other m 2021-04-30T04:34:45.31
IV.EMSG.HHE. ML:2.0 0.0005344999999999999 0.64 AML other m 2021-04-30T04:34:46.95
IV.EPZF.HHE. ML:1.8 0.000279 0.36 AML other m 2021-04-30T04:34:46.64
IV.EMSG.HHN. ML:2.0 0.000558 1.52 AML other m 2021-04-30T04:34:47.13
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