Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 18-08-2021 and time 02:40:51 (Italy) in region 1 km W Sant'Alfio (CT)

A magnitude ML 2.0 earthquake occured in region: 1 km W Sant'Alfio (CT), on

  • 18-08-2021 00:40:51 (UTC)
  • 18-08-2021 02:40:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.7420, 15.1320 at 11 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 2 1087 2669
Giarre CT 5 27659 30328
Zafferana Etnea CT 6 9517 39845
Mascali CT 6 14282 54127
Santa Venerina CT 6 8592 62719
Riposto CT 7 14838 77557
Piedimonte Etneo CT 9 3963 81520
Fiumefreddo di Sicilia CT 9 9623 91143
Linguaglossa CT 11 5403 96546
Calatabiano CT 13 5308 101854
Trecastagni CT 15 10910 112764
Acireale CT 15 52622 165386
Viagrande CT 15 8563 173949
Aci Sant'Antonio CT 15 17984 191933
Pedara CT 15 14102 206035
Gaggi ME 15 3184 209219
Aci Catena CT 16 29851 239070
Castiglione di Sicilia CT 16 3215 242285
Aci Bonaccorsi CT 16 3524 245809
Nicolosi CT 17 7463 253272
Giardini-Naxos ME 17 9415 262687
Motta Camastra ME 18 845 263532
Francavilla di Sicilia ME 18 3945 267477
Valverde CT 18 7840 275317
Taormina ME 18 10960 286277
Castelmola ME 18 1088 287365
San Giovanni la Punta CT 19 23060 310425
Graniti ME 19 1492 311917
Moio Alcantara ME 19 717 312634
Tremestieri Etneo CT 19 20589 333223
San Gregorio di Catania CT 20 11966 345189
Mascalucia CT 20 31958 377147

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km N of Acireale (52622 inhabitants)
27 Km N of Catania (314555 inhabitants)
61 Km SW of Reggio di Calabria (183035 inhabitants)
63 Km SW of Messina (238439 inhabitants)
77 Km N of Siracusa (122291 inhabitants)
97 Km NE of Ragusa (73313 inhabitants)
98 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 2021-08-18
00:40:51		 37.7425 15.1318 11 2021-12-29
11:12:23		 Bollettino Sismico Italiano INGV 94819671
Reviewed
Rev200 		ML 1.7 2021-08-18
00:40:51		 37.744 15.113 10 2021-12-10
11:10:56		 Sala Operativa INGV_OE (Catania) 94315891
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-18 00:40:51 ± 0.05
Latitude 37.7425 ± 0.0027
Longitude 15.1318 ± 0.0045
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 94819671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 407
Semi-minor axis of confidence ellipse (meter) 297
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 296
Circular confidence region, given by single value of horizontal uncertainty (meter) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 54
Number of defining phases 54
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) 0.01259
Epicentral distance of station farthest from the epicenter (degree) 0.78241
Number of stations at which the event was observed 35
Number of stations from which data was used for origin computation 35
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 36
Type of magnitude ML
Reference to an origin 94819671
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-10 11:10:44

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 94315891
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-08-18 00:48:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MPNC.HHZ. 2021-08-18T00:41:07.23 0.3 undecidable manual S 23 48.8178 50 -0.27 66
IV.HAVL.HHZ. 2021-08-18T00:41:07.12 0.3 undecidable manual P 181 86.8464 50 0.34 60
IV.SSY.HHZ. 2021-08-18T00:41:03.71 0.6 undecidable manual P 185 65.0904 50 0.29 43
IV.NOV.HHZ. 2021-08-18T00:41:03.16 0.3 undecidable manual S 1 31.6461 50 0.24 69
IV.MTTG.HHE. 2021-08-18T00:41:02.66 0.1 undecidable manual P 60 57.498 50 0.4 84
IV.GALF.HHZ. 2021-08-18T00:41:01.31 0.3 undecidable manual P 266 49.7169 50 0.26 66
IV.AIO.HHZ. 2021-08-18T00:41:01.58 0.3 undecidable manual S 19 26.8509 50 -0.07 72
IV.HCRL.HHN. 2021-08-18T00:41:01.10 0.1 undecidable manual P 190 51.7038 50 -0.26 88
IV.EPZF.HHZ. 2021-08-18T00:41:01.53 0.3 undecidable manual S 291 25.752 50 0.18 70
IV.MPNC.HHZ. 2021-08-18T00:41:00.80 0.6 undecidable manual P 23 48.8178 50 -0.11 45
IV.HLNI.HHZ. 2021-08-18T00:41:00.83 0.6 undecidable manual P 208 49.3173 50 -0.16 45
IV.MUCR.HHZ. 2021-08-18T00:40:59.51 0.6 undecidable manual P 326 40.2264 50 -0.08 46
IV.EMSG.HHZ. 2021-08-18T00:40:59.31 0.6 undecidable manual S 299 18.1707 120 0.11 48
IV.ENIC.HHZ. 2021-08-18T00:40:58.59 0.3 undecidable manual S 218 15.6732 124 0.12 72
IV.ESLN.HHZ. 2021-08-18T00:40:58.14 0.6 undecidable manual S 249 14.874 125 -0.09 48
IV.NOV.HHZ. 2021-08-18T00:40:58.15 0.3 undecidable manual P 1 31.6461 50 -0.12 70
IV.EMNR.HHZ. 2021-08-18T00:40:58.27 0.3 undecidable manual S 312 12.3765 130 0.71 62
IV.EMPL.HHZ. 2021-08-18T00:40:58.37 0.3 undecidable manual S 244 15.873 124 -0.14 72
IV.AIO.HHZ. 2021-08-18T00:40:57.29 0.3 undecidable manual P 19 26.8509 50 -0.24 69
IV.EFIU.HHZ. 2021-08-18T00:40:57.10 0.6 undecidable manual S 53 8.5803 141 0.46 45
IV.ECTS.HHZ. 2021-08-18T00:40:57.83 0.3 undecidable manual S 356 15.4734 124 -0.58 64
IV.ESCV.HHZ. 2021-08-18T00:40:57.82 0.3 undecidable manual P 271 27.75 50 0.15 70
IV.EPDN.HHZ. 2021-08-18T00:40:57.77 0.6 undecidable manual S 284 10.3785 135 0.71 41
IV.EPZF.HHZ. 2021-08-18T00:40:57.48 0.3 undecidable manual P 291 25.752 50 0.12 71
IV.ESML.HHZ. 2021-08-18T00:40:57.60 0.3 undecidable manual P 238 26.1516 50 0.19 70
IV.EPIT.HHZ. 2021-08-18T00:40:57.71 0.6 undecidable manual S 319 10.0788 136 0.74 41
IV.EMCN.HNZ. 2021-08-18T00:40:57.00 0.6 undecidable manual S 302 10.1787 136 0.01 50
IV.EVRN.HHZ. 2021-08-18T00:40:56.41 0.3 undecidable manual S 177 5.8941 151 0.3 71
IV.ECHR.HNZ. 2021-08-18T00:40:56.35 0.6 undecidable manual P 252 20.1687 118 -0.12 48
IV.ESPC.HHZ. 2021-08-18T00:40:56.51 0.6 undecidable manual S 239 10.6782 135 -0.62 43
IV.EMSG.HHZ. 2021-08-18T00:40:56.21 0.3 undecidable manual P 299 18.1707 120 0.09 72
IV.ECBD.HHZ. 2021-08-18T00:40:56.08 0.3 undecidable manual S 316 5.7942 151 0 75
IV.ECZM.HHZ. 2021-08-18T00:40:56.47 0.1 undecidable manual P 266 20.0688 118 0.03 97
IV.ESLN.HHZ. 2021-08-18T00:40:55.13 0.3 undecidable manual P 249 14.874 125 -0.43 68
IV.EMFO.HHZ. 2021-08-18T00:40:55.83 0.3 undecidable manual S 258 3.6963 161 0.04 75
IV.ECNE.HHZ. 2021-08-18T00:40:55.18 0.1 undecidable manual P 283 11.6772 132 0.12 97
IV.ESAL.HHZ. 2021-08-18T00:40:55.91 0.3 undecidable manual S 9 1.3986 172 0.31 71
IV.EMPL.HHZ. 2021-08-18T00:40:55.41 0.6 undecidable manual P 244 15.873 124 -0.31 46
IV.ESVO.HHZ. 2021-08-18T00:40:55.57 0.3 undecidable manual P 282 16.5723 123 -0.27 70
IV.ECTS.HHZ. 2021-08-18T00:40:55.30 0.1 positive manual P 356 15.4734 124 -0.36 91
IV.EMNR.HHZ. 2021-08-18T00:40:55.23 0.1 undecidable manual P 312 12.3765 130 0.06 98
IV.ENIC.HHZ. 2021-08-18T00:40:55.84 0.3 undecidable manual P 218 15.6732 124 0.15 72
IV.EPOZ.HHZ. 2021-08-18T00:40:55.09 0.3 undecidable manual P 148 9.2796 139 0.37 69
IV.EMCN.HNZ. 2021-08-18T00:40:54.83 0.1 undecidable manual P 302 10.1787 136 -0.01 99
IV.ECPN.HHZ. 2021-08-18T00:40:54.86 0.3 undecidable manual P 271 12.7761 130 -0.36 69
IV.EFIU.HHZ. 2021-08-18T00:40:54.52 0.1 negative manual P 53 8.5803 141 -0.12 97
IV.ECBD.HHZ. 2021-08-18T00:40:54.14 0.1 undecidable manual P 316 5.7942 151 -0.18 97
IV.EMFS.HHZ. 2021-08-18T00:40:54.86 0.3 undecidable manual P 258 11.9769 131 -0.25 71
IV.ESPC.HHZ. 2021-08-18T00:40:54.61 0.1 undecidable manual P 239 10.6782 135 -0.31 93
IV.EPDN.HHZ. 2021-08-18T00:40:54.94 0.1 undecidable manual P 284 10.3785 135 0.06 98
IV.EPIT.HHZ. 2021-08-18T00:40:54.91 0.1 positive manual P 319 10.0788 136 0.08 98
IV.EVRN.HHZ. 2021-08-18T00:40:54.32 0.1 positive manual P 177 5.8941 151 -0.01 100
IV.EMFO.HHZ. 2021-08-18T00:40:53.97 0.1 undecidable manual P 258 3.6963 161 -0.18 97
IV.ESAL.HHZ. 2021-08-18T00:40:53.85 0.1 negative manual P 9 1.3986 172 -0.19 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EFIU.HHN. ML:1.7 0.000696 0.7 AML other m 2021-08-18T00:40:57.99
IV.EPIT.HHN. ML:2.5 0.00429 1.28 AML other m 2021-08-18T00:40:58.21
IV.EPIT.HHE. ML:2.5 0.00415 0.3 AML other m 2021-08-18T00:40:58.16
IV.EFIU.HHE. ML:1.8 0.0008975 1.06 AML other m 2021-08-18T00:40:58.93
IV.EVRN.HNE. ML:2.4 0.003485 1.5 AML other m 2021-08-18T00:40:58.81
IV.EVRN.HHN. ML:2.5 0.0049299999999999995 0.72 AML other m 2021-08-18T00:40:58.82
IV.EMPL.HHN. ML:2.3 0.0017349999999999998 0.2 AML other m 2021-08-18T00:40:59.01
IV.EPOZ.HHE. ML:2.1 0.0015049999999999998 1 AML other m 2021-08-18T00:40:59.72
IV.EMPL.HHE. ML:2.2 0.001465 0.18 AML other m 2021-08-18T00:40:59.97
IV.EPOZ.HHN. ML:2.2 0.001915 1.14 AML other m 2021-08-18T00:41:00.89
IV.ECTS.HHE. ML:1.7 0.0004255 0.38 AML other m 2021-08-18T00:41:00.54
IV.EVRN.HNN. ML:2.5 0.00467 0.7 AML other m 2021-08-18T00:41:01.08
IV.ENIC.HHN. ML:2.1 0.0012850000000000001 0.7 AML other m 2021-08-18T00:41:01.17
IV.ENIC.HNN. ML:2.2 0.0014449999999999999 0.68 AML other m 2021-08-18T00:41:01.53
IV.EVRN.HHE. ML:2.4 0.00375 0.22 AML other m 2021-08-18T00:41:01.45
IV.ECTS.HHN. ML:1.7 0.00044899999999999996 0.4 AML other m 2021-08-18T00:41:01.65
IV.ENIC.HHE. ML:2.2 0.00145 1.3 AML other m 2021-08-18T00:41:02.82
IV.AIO.HHE. ML:1.7 0.000245 0.52 AML other m 2021-08-18T00:41:02.47
IV.ENIC.HNE. ML:2.2 0.0014 1.42 AML other m 2021-08-18T00:41:02.04
IV.EPZF.HHE. ML:1.9 0.00045650000000000004 0.4 AML other m 2021-08-18T00:41:04.20
IV.EMSG.HHN. ML:2.0 0.0009065000000000001 1.04 AML other m 2021-08-18T00:41:04.54
IV.AIO.HHN. ML:1.6 0.00023449999999999998 0.3 AML other m 2021-08-18T00:41:04.43
IV.EMSG.HHE. ML:2.1 0.001115 0.22 AML other m 2021-08-18T00:41:05.16
IV.ESCV.HHE. ML:1.9 0.0003835 1.34 AML other m 2021-08-18T00:41:05.27
IV.NOV.HHN. ML:2.0 0.00041400000000000003 0.74 AML other m 2021-08-18T00:41:05.08
IV.NOV.HHE. ML:2.1 0.0006450000000000001 0.52 AML other m 2021-08-18T00:41:05.70
IV.ESCV.HHN. ML:1.9 0.00039449999999999994 0.22 AML other m 2021-08-18T00:41:06.89
IV.EPZF.HHN. ML:1.9 0.0004385 0.32 AML other m 2021-08-18T00:41:07.16
IV.ESML.HHE. ML:1.7 0.000265 0.52 AML other m 2021-08-18T00:41:07.39
IV.ESML.HHN. ML:1.6 0.00021 0.86 AML other m 2021-08-18T00:41:10.91
IV.MUCR.HHN. ML:1.5 0.0001041 0.42 AML other m 2021-08-18T00:41:11.75
IV.MUCR.HHE. ML:1.5 0.0001036 0.42 AML other m 2021-08-18T00:41:12.35
IV.GALF.HHE. ML:1.9 0.0002125 1.54 AML other m 2021-08-18T00:41:13.95
IV.SSY.HHE. ML:2.3 0.00033499999999999996 1.3 AML other m 2021-08-18T00:41:15.88
IV.SSY.HHN. ML:2.4 0.0005335000000000001 0.88 AML other m 2021-08-18T00:41:17.37
IV.GALF.HHN. ML:1.9 0.000222 0.82 AML other m 2021-08-18T00:41:23.99
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