Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 18-08-2021 and time 02:59:07 (Italy) in region 2 km NW Sant'Alfio (CT)

A magnitude ML 2.1 earthquake occured in region: 2 km NW Sant'Alfio (CT), on

  • 18-08-2021 00:59:07 (UTC)
  • 18-08-2021 02:59:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.7560, 15.1250 at 10 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 4 1087 2669
Giarre CT 6 27659 30328
Mascali CT 6 14282 44610
Zafferana Etnea CT 7 9517 54127
Riposto CT 7 14838 68965
Piedimonte Etneo CT 8 3963 72928
Santa Venerina CT 8 8592 81520
Fiumefreddo di Sicilia CT 9 9623 91143
Linguaglossa CT 10 5403 96546
Calatabiano CT 12 5308 101854
Castiglione di Sicilia CT 14 3215 105069
Gaggi ME 15 3184 108253
Trecastagni CT 16 10910 119163
Motta Camastra ME 16 845 120008
Francavilla di Sicilia ME 16 3945 123953
Viagrande CT 16 8563 132516
Pedara CT 16 14102 146618
Acireale CT 16 52622 199240
Giardini-Naxos ME 16 9415 208655
Aci Sant'Antonio CT 17 17984 226639
Aci Catena CT 17 29851 256490
Moio Alcantara ME 17 717 257207
Aci Bonaccorsi CT 18 3524 260731
Graniti ME 18 1492 262223
Castelmola ME 18 1088 263311
Taormina ME 18 10960 274271
Nicolosi CT 18 7463 281734
Malvagna ME 19 733 282467
Valverde CT 20 7840 290307
San Giovanni la Punta CT 20 23060 313367

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km N of Acireale (52622 inhabitants)
28 Km N of Catania (314555 inhabitants)
60 Km SW of Reggio di Calabria (183035 inhabitants)
62 Km SW of Messina (238439 inhabitants)
79 Km N of Siracusa (122291 inhabitants)
98 Km E of Caltanissetta (63360 inhabitants)
99 Km NE of Ragusa (73313 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 2.1 2021-08-18
00:59:07		 37.7562 15.1252 10 2021-12-29
11:12:24		 Bollettino Sismico Italiano INGV 94919591
Reviewed
Rev200 		ML 2.0 2021-08-18
00:59:07		 37.752 15.1 9 2021-12-10
11:13:27		 Sala Operativa INGV_OE (Catania) 94316781
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-18 00:59:07 ± 0.06
Latitude 37.7562 ± 0.0036
Longitude 15.1252 ± 0.0068
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 94919591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 577
Semi-minor axis of confidence ellipse (meter) 326
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 291
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
Number of associated phases, regardless of their use for origin computation 53
Number of defining phases 41
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.81029
Number of stations at which the event was observed 35
Number of stations from which data was used for origin computation 26
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 94316781
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-08-18 01:06:01

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 36
Type of magnitude ML
Reference to an origin 94919591
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-10 11:13:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAVL.HHZ. 2021-08-18T00:59:33.93 0.3 undecidable manual S 180 88.3449 50 0.19 62
IV.SSY.HHZ. 2021-08-18T00:59:28.11 0.3 undecidable manual S 184 66.4779 50 0.19 65
IV.MSRU.HHE. 2021-08-18T00:59:27.75 0.3 undecidable manual S 31 65.5899 50 0.1 66
IV.HCRL.HHE. 2021-08-18T00:59:24.43 0.3 undecidable manual S 189 53.1024 50 0.1 68
IV.HAGA.HHE. 2021-08-18T00:59:24.28 0.6 undecidable manual S 177 52.3032 50 0.16 45
IV.MPNC.HHN. 2021-08-18T00:59:22.78 1.0 undecidable manual S 25 47.7189 50 -0.1 23
IV.HAVL.HHZ. 2021-08-18T00:59:22.43 0.3 undecidable manual P 180 88.3449 50 -0.16 63
IV.PLLN.EHZ. 2021-08-18T00:59:22.55 0.3 undecidable manual P 287 89.9433 50 -0.28 61
IV.HLNI.HHZ. 2021-08-18T00:59:22.99 0.3 undecidable manual S 206 50.4162 50 -0.62 60
IV.MSRU.HHE. 2021-08-18T00:59:19.18 0.1 undecidable manual P 31 65.5899 50 0.11 88
IV.ESCV.HHN. 2021-08-18T00:59:19.65 3.0 undecidable manual S 1.32 0
IV.MTTG.HHE. 2021-08-18T00:59:18.38 0.1 undecidable manual P 61 57.2982 50 0.58 80
IV.SSY.HHZ. 2021-08-18T00:59:18.96 0.3 undecidable manual P 184 66.4779 50 -0.26 64
IV.MSFR.HHZ. 2021-08-18T00:59:18.21 0.6 undecidable manual P 304 55.9995 50 0.62 39
IV.HAGA.HHE. 2021-08-18T00:59:17.33 0.1 undecidable manual P 177 52.3032 50 0.3 87
IV.GALF.HHZ. 2021-08-18T00:59:17.43 0.3 undecidable manual P 264 49.2174 50 0.87 54
IV.AIO.HHN. 2021-08-18T00:59:17.10 0.6 undecidable manual S 22 25.6521 110 0.25 46
IT.LNT.HGZ. 2021-08-18T00:59:17.21 0.1 undecidable manual P 192 53.0025 50 0.07 91
IV.EPZF.HHN. 2021-08-18T00:59:17.24 3.0 undecidable manual S -0.41 0
IV.HLNI.HHZ. 2021-08-18T00:59:16.29 0.3 undecidable manual P 206 50.4162 50 -0.45 63
IV.MPNC.HHN. 2021-08-18T00:59:16.01 0.1 undecidable manual P 25 47.7189 50 -0.31 87
IV.HCRL.HHE. 2021-08-18T00:59:16.87 0.3 undecidable manual P 189 53.1024 50 -0.28 65
IV.EMSG.HHN. 2021-08-18T00:59:15.38 3.0 undecidable manual S 0.01 0
IV.MUCR.HHZ. 2021-08-18T00:59:14.90 0.3 undecidable manual P 325 38.7279 50 -0.03 70
IV.EPIT.HHE. 2021-08-18T00:59:13.32 3.0 undecidable manual S 0.3 0
IV.EMFS.HHZ. 2021-08-18T00:59:13.01 0.3 undecidable manual S 250 11.877 129 0.38 69
IV.ESML.HHZ. 2021-08-18T00:59:13.07 3.0 positive manual P -0.05 0
IV.ESCV.HHZ. 2021-08-18T00:59:13.35 3.0 positive manual P -0.1 0
IV.NOV.HHZ. 2021-08-18T00:59:13.49 0.3 undecidable manual P 2 30.1476 50 -0.13 70
IV.EPZF.HHZ. 2021-08-18T00:59:12.86 3.0 positive manual P -0.21 0
IV.EMCN.HHZ. 2021-08-18T00:59:12.29 0.6 undecidable manual S 296 8.88 137 0.41 46
IV.ECTS.HHN. 2021-08-18T00:59:12.34 0.3 undecidable manual S 359 13.9749 124 -0.88 57
IV.AIO.HHN. 2021-08-18T00:59:12.55 0.3 undecidable manual P 22 25.6521 110 -0.28 68
IV.EVRN.HHN. 2021-08-18T00:59:11.70 0.3 undecidable manual S 173 7.4814 142 0.15 73
IV.ECBD.HHZ. 2021-08-18T00:59:11.42 0.6 undecidable manual S 308 4.2957 156 0.44 46
IV.EMSG.HHZ. 2021-08-18T00:59:11.53 3.0 negative manual P -0.26 0
IV.EFIU.HHN. 2021-08-18T00:59:11.94 0.3 undecidable manual S 64 8.3805 139 0.2 72
IV.ECTS.HHN. 2021-08-18T00:59:10.58 0.3 undecidable manual P 359 13.9749 124 -0.16 72
IV.EMPL.HHE. 2021-08-18T00:59:10.84 3.0 undecidable manual P -0.61 0
IV.EMFO.HHZ. 2021-08-18T00:59:10.94 0.6 undecidable manual S 234 3.7962 158 0.04 50
IV.EMNR.HHZ. 2021-08-18T00:59:10.64 0.1 undecidable manual P 308 10.9779 131 0.38 92
IV.ECNE.HHZ. 2021-08-18T00:59:10.25 0.1 undecidable manual P 275 10.878 131 0.01 99
IV.EPOZ.HHZ. 2021-08-18T00:59:10.65 3.0 negative manual P 0.64 0
IV.EMFS.HHZ. 2021-08-18T00:59:10.15 0.1 undecidable manual P 250 11.877 129 -0.25 94
IV.EMCN.HHZ. 2021-08-18T00:59:10.16 0.1 undecidable manual P 296 8.88 137 0.2 96
IV.ENIC.HHE. 2021-08-18T00:59:10.05 3.0 negative manual P -1.28 0
IV.ESVO.HHZ. 2021-08-18T00:59:10.82 0.1 undecidable manual P 277 15.7731 121 -0.22 94
IV.ECBD.HHZ. 2021-08-18T00:59:09.43 0.1 undecidable manual P 308 4.2957 156 -0.01 100
IV.EFIU.HHN. 2021-08-18T00:59:09.82 0.3 undecidable manual P 64 8.3805 139 -0.07 74
IV.ESAL.HHE. 2021-08-18T00:59:09.22 3.0 negative manual P -0.34 0
IV.EMFO.HHZ. 2021-08-18T00:59:09.25 0.1 undecidable manual P 234 3.7962 158 -0.15 97
IV.EVRN.HHN. 2021-08-18T00:59:09.60 0.3 undecidable manual P 173 7.4814 142 -0.17 72
IV.ESPC.HHZ. 2021-08-18T00:59:09.89 0.1 undecidable manual P 231 11.0778 131 -0.39 91
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EVRN.HHN. ML:2.7 0.00791 0.14 AML other m 2021-08-18T00:59:12.38
IV.EFIU.HHN. ML:1.8 0.0009379999999999999 0.58 AML other m 2021-08-18T00:59:13.07
IV.EPIT.HHN. ML:2.7 0.00675 0.68 AML other m 2021-08-18T00:59:13.54
IV.EPIT.HHE. ML:2.6 0.00591 0.28 AML other m 2021-08-18T00:59:13.52
IV.EFIU.HHE. ML:1.9 0.001265 1.02 AML other m 2021-08-18T00:59:13.32
IV.EVRN.HNN. ML:2.7 0.00771 0.42 AML other m 2021-08-18T00:59:14.58
IV.EPOZ.HHE. ML:2.4 0.0030499999999999998 1.32 AML other m 2021-08-18T00:59:15.71
IV.EVRN.HNE. ML:2.6 0.005945000000000001 0.22 AML other m 2021-08-18T00:59:15.33
IV.EVRN.HHE. ML:2.6 0.006019999999999999 0.24 AML other m 2021-08-18T00:59:15.34
IV.EPOZ.HHN. ML:2.4 0.00303 0.46 AML other m 2021-08-18T00:59:15.63
IV.EMPL.HHE. ML:2.5 0.00271 1.78 AML other m 2021-08-18T00:59:17.07
IV.AIO.HHE. ML:1.8 0.00034899999999999997 1.2 AML other m 2021-08-18T00:59:17.84
IV.EMPL.HHN. ML:2.6 0.003345 0.22 AML other m 2021-08-18T00:59:17.34
IV.EMSG.HHN. ML:2.3 0.001655 0.84 AML other m 2021-08-18T00:59:18.32
IV.EPZF.HHE. ML:2.2 0.0008535 0.36 AML other m 2021-08-18T00:59:19.76
IV.AIO.HHN. ML:1.8 0.0003595 0.28 AML other m 2021-08-18T00:59:19.81
IV.ESML.HNN. ML:1.8 0.00038849999999999996 1.34 AML other m 2021-08-18T00:59:20.89
IV.ESML.HHN. ML:1.8 0.00034599999999999995 1.3 AML other m 2021-08-18T00:59:20.22
IV.EMSG.HHE. ML:2.3 0.00165 0.22 AML other m 2021-08-18T00:59:20.62
IV.ESCV.HHE. ML:2.0 0.000572 0.26 AML other m 2021-08-18T00:59:20.61
IV.NOV.HHE. ML:2.2 0.0007185000000000001 0.32 AML other m 2021-08-18T00:59:21.08
IV.ESML.HNE. ML:1.8 0.00035499999999999996 0.66 AML other m 2021-08-18T00:59:21.88
IV.ESCV.HHN. ML:2.2 0.0008085 0.22 AML other m 2021-08-18T00:59:22.24
IV.EPZF.HHN. ML:2.0 0.0006525 0.32 AML other m 2021-08-18T00:59:22.35
IV.ESML.HHE. ML:1.8 0.0003845 0.54 AML other m 2021-08-18T00:59:22.46
IV.MUCR.HHE. ML:1.6 0.000161 0.36 AML other m 2021-08-18T00:59:22.87
IV.NOV.HHN. ML:2.0 0.0005415 0.58 AML other m 2021-08-18T00:59:23.49
IV.HLNI.HHE. ML:1.4 0.00006795 0.7 AML other m 2021-08-18T00:59:24.64
IV.HCRL.HHE. ML:1.8 0.0001555 0.78 AML other m 2021-08-18T00:59:25.49
IV.MPNC.HHE. ML:2.0 0.00026000000000000003 0.84 AML other m 2021-08-18T00:59:26.42
IV.HCRL.HHN. ML:1.8 0.00013450000000000002 0.94 AML other m 2021-08-18T00:59:27.02
IV.MUCR.HHN. ML:1.6 0.000156 1.56 AML other m 2021-08-18T00:59:27.91
IV.HLNI.HHN. ML:1.5 0.00007384999999999999 0.66 AML other m 2021-08-18T00:59:27.19
IV.MPNC.HHN. ML:2.0 0.0002465 0.54 AML other m 2021-08-18T00:59:28.26
IV.GALF.HHE. ML:2.3 0.00048350000000000004 1.4 AML other m 2021-08-18T00:59:33.15
IV.GALF.HHN. ML:2.2 0.000409 1.26 AML other m 2021-08-18T00:59:38.96
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