Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.4 on date 21-03-2021 and time 09:47:43 (Italy) in region 1 km N Sant'Alfio (CT)

A magnitude ML 2.4 earthquake occured in region: 1 km N Sant'Alfio (CT), on

  • 21-03-2021 08:47:43 (UTC)
  • 21-03-2021 09:47:43 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7520, 15.1470 at 9 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
Giarre CT 4 27659 29241
Milo CT 4 1087 30328
Mascali CT 4 14282 44610
Riposto CT 6 14838 59448
Piedimonte Etneo CT 7 3963 63411
Fiumefreddo di Sicilia CT 7 9623 73034
Santa Venerina CT 7 8592 81626
Zafferana Etnea CT 7 9517 91143
Linguaglossa CT 10 5403 96546
Calatabiano CT 11 5308 101854
Gaggi ME 14 3184 105038
Castiglione di Sicilia CT 15 3215 108253
Giardini-Naxos ME 15 9415 117668
Acireale CT 16 52622 170290
Trecastagni CT 16 10910 181200
Aci Sant'Antonio CT 16 17984 199184
Motta Camastra ME 16 845 200029
Viagrande CT 16 8563 208592
Taormina ME 16 10960 219552
Castelmola ME 17 1088 220640
Aci Catena CT 17 29851 250491
Francavilla di Sicilia ME 17 3945 254436
Pedara CT 17 14102 268538
Graniti ME 17 1492 270030
Aci Bonaccorsi CT 17 3524 273554
Moio Alcantara ME 18 717 274271
Nicolosi CT 19 7463 281734
Valverde CT 19 7840 289574
San Giovanni la Punta CT 20 23060 312634

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km N of Acireale (52622 inhabitants)
28 Km N of Catania (314555 inhabitants)
59 Km SW of Reggio di Calabria (183035 inhabitants)
61 Km SW of Messina (238439 inhabitants)
78 Km N of Siracusa (122291 inhabitants)
99 Km NE of Ragusa (73313 inhabitants)
100 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 2.4 2021-03-21
08:47:43		 37.7522 15.1467 9 2021-07-12
16:55:04		 Bollettino Sismico Italiano INGV 88743811
Reviewed
Rev200 		ML 2.3 2021-03-21
08:47:42		 37.755 15.119 8 2021-06-18
16:51:50		 Sala Operativa INGV_OE (Catania) 88341701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-21 08:47:43 ± 0.07
Latitude 37.7522 ± 0.0036
Longitude 15.1467 ± 0.0057
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88743811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 504
Semi-minor axis of confidence ellipse (meter) 352
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) 500.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 52
Number of defining phases 52
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00989
Epicentral distance of station farthest from the epicenter (degree) 0.84356
Number of stations at which the event was observed 38
Number of stations from which data was used for origin computation 38
Magnitudes information

ML:2.4

Field Value
Value 2.4
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 88743811
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-18 16:51:33

ML:2.3

Field Value
Value 2.3
Uncertainty 0.1
Num. used stations
Type of magnitude ML
Reference to an origin 88341701
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-03-21 09:01:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HMDC.HNN. 2021-03-21T08:48:00.01 0.6 undecidable manual P 200 93.6396 50 0.61 37
IV.RAFF.HHZ. 2021-03-21T08:47:59.45 0.3 undecidable manual P 230 90.6426 50 0.51 58
MN.CEL.HHZ. 2021-03-21T08:47:58.49 0.3 undecidable manual P 49 86.247 50 0.22 63
IV.MPNC.HHN. 2021-03-21T08:47:58.83 0.6 undecidable manual S 22 47.3193 50 -0.01 47
IV.HAVL.HHZ. 2021-03-21T08:47:58.31 0.6 undecidable manual P 181 87.9453 50 -0.21 42
IV.SSY.HHZ. 2021-03-21T08:47:55.32 0.3 undecidable manual P 186 66.2781 50 0.14 66
IV.MTTG.HHE. 2021-03-21T08:47:54.00 0.3 undecidable manual P 60 55.8996 50 0.42 64
IV.MSRU.HHZ. 2021-03-21T08:47:54.82 0.6 undecidable manual P 29 64.9905 50 -0.16 44
IV.MSFR.HHZ. 2021-03-21T08:47:54.24 0.3 undecidable manual P 303 57.7977 50 0.37 64
IV.GALF.HHZ. 2021-03-21T08:47:53.60 0.3 undecidable manual P 265 51.1155 50 0.75 57
IV.HLNI.HHZ. 2021-03-21T08:47:52.26 0.3 undecidable manual P 208 50.9157 50 -0.55 62
IV.HCRL.HHZ. 2021-03-21T08:47:52.97 0.3 undecidable manual P 191 53.0025 50 -0.17 68
IV.MUCR.HHZ. 2021-03-21T08:47:51.10 0.3 undecidable manual P 324 40.1265 50 -0.06 71
IV.MPNC.HHN. 2021-03-21T08:47:51.87 0.3 undecidable manual P 22 47.3193 50 -0.39 65
IV.NOV.HHZ. 2021-03-21T08:47:49.34 0.1 undecidable manual P 358 30.6471 106 -0.31 91
IV.ESLN.HHZ. 2021-03-21T08:47:49.51 0.6 undecidable manual S 247 16.4724 118 -0.25 47
IV.ESML.HHZ. 2021-03-21T08:47:49.16 0.6 undecidable manual P 238 27.75 108 0.05 48
IV.EMFS.HHZ. 2021-03-21T08:47:49.16 0.6 undecidable manual S 255 13.5753 123 0.27 47
IV.EMPL.HHZ. 2021-03-21T08:47:49.78 0.6 undecidable manual S 242 17.4714 117 -0.29 47
IV.ESCV.HHZ. 2021-03-21T08:47:49.46 0.6 undecidable manual P 269 29.0487 107 0.1 48
IV.ECTS.HHZ. 2021-03-21T08:47:49.64 0.6 undecidable manual S 351 14.5743 121 0.44 45
IV.ESPC.HHZ. 2021-03-21T08:47:48.58 0.6 undecidable manual S 238 12.3765 126 0.02 50
IV.ECHR.HNZ. 2021-03-21T08:47:48.03 0.3 undecidable manual P 250 21.7671 112 0.05 73
IV.EPIT.HHZ. 2021-03-21T08:47:48.87 0.3 undecidable manual S 310 10.2786 131 0.89 58
IV.EMCN.HHZ. 2021-03-21T08:47:48.74 0.6 undecidable manual S 294 10.7781 129 0.61 43
IV.EPOZ.HHZ. 2021-03-21T08:47:48.85 0.6 undecidable manual S 158 9.5793 133 1.04 36
IV.EPZF.HHZ. 2021-03-21T08:47:48.94 0.3 undecidable manual P 288 26.6511 108 0.05 73
IV.AIO.HHZ. 2021-03-21T08:47:48.38 0.1 positive manual P 17 25.4523 109 -0.29 92
IV.ENIC.HNZ. 2021-03-21T08:47:47.42 0.3 undecidable manual P 219 17.2716 117 0.25 71
IV.EFIU.HHZ. 2021-03-21T08:47:47.72 0.6 undecidable manual S 53 6.993 142 0.54 45
IV.EMSG.HHZ. 2021-03-21T08:47:47.76 0.1 undecidable manual P 294 18.87 115 0.31 93
IV.EVRN.HNZ. 2021-03-21T08:47:47.62 0.3 undecidable manual S 188 7.0929 142 0.41 69
IV.ESVO.HHZ. 2021-03-21T08:47:47.03 0.1 undecidable manual P 278 17.6712 117 -0.2 95
IV.ECBD.HHZ. 2021-03-21T08:47:47.31 0.6 undecidable manual S 301 6.0939 145 0.29 48
IV.ECZM.HHZ. 2021-03-21T08:47:47.92 0.1 undecidable manual P 264 21.3675 113 0.01 98
IV.ESAL.HHZ. 2021-03-21T08:47:46.23 0.6 undecidable manual S 287 1.0989 173 -0.15 50
IV.EMFS.HHZ. 2021-03-21T08:47:46.20 0.1 undecidable manual P 255 13.5753 123 -0.32 94
IV.EMPL.HHZ. 2021-03-21T08:47:46.85 0.3 undecidable manual P 242 17.4714 117 -0.35 69
IV.EPOZ.HHZ. 2021-03-21T08:47:46.10 0.1 positive manual P 158 9.5793 133 0.21 96
IV.ECPN.HHZ. 2021-03-21T08:47:46.40 0.3 undecidable manual P 266 14.0748 122 -0.21 72
IV.EMCN.HHZ. 2021-03-21T08:47:46.12 0.1 undecidable manual P 294 10.7781 129 0.04 99
IV.EMFO.HHZ. 2021-03-21T08:47:46.75 0.6 undecidable manual S 250 5.2947 149 -0.11 50
IV.ECTS.HHZ. 2021-03-21T08:47:46.35 0.1 undecidable manual P 351 14.5743 121 -0.34 93
IV.ECNE.HHZ. 2021-03-21T08:47:46.39 0.1 undecidable manual P 277 12.7761 125 0 100
IV.EPIT.HHZ. 2021-03-21T08:47:46.18 0.1 positive manual P 310 10.2786 131 0.19 97
IV.ESLN.HHZ. 2021-03-21T08:47:46.54 0.3 undecidable manual P 247 16.4724 118 -0.48 67
IV.EVRN.HNZ. 2021-03-21T08:47:45.41 0.1 undecidable manual P 188 7.0929 142 -0.13 98
IV.ECBD.HHZ. 2021-03-21T08:47:45.22 0.1 undecidable manual P 301 6.0939 145 -0.21 97
IV.EFIU.HHZ. 2021-03-21T08:47:45.36 0.1 negative manual P 53 6.993 142 -0.17 98
IV.ESPC.HHZ. 2021-03-21T08:47:45.99 0.1 undecidable manual P 238 12.3765 126 -0.33 93
IV.EMFO.HHZ. 2021-03-21T08:47:45.00 0.1 undecidable manual P 250 5.2947 149 -0.34 94
IV.ESAL.HHZ. 2021-03-21T08:47:44.63 0.1 negative manual P 287 1.0989 173 -0.43 93
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EVRN.HNN. ML:2.5 0.004701504 0.3008 AML other m 2021-03-21T08:47:47.60
IV.EVRN.HHE. ML:2.8 0.0116238715 0.3392 AML other m 2021-03-21T08:47:47.85
IV.EVRN.HNE. ML:2.9 0.01335 0.36 AML other m 2021-03-21T08:47:47.85
IV.EVRN.HHN. ML:2.7 0.009389297500000001 0.6656 AML other m 2021-03-21T08:47:47.62
IV.EPIT.HHE. ML:3.3 0.02425 0.34 AML other m 2021-03-21T08:47:49.25
IV.EPIT.HHN. ML:3.3 0.02725 0.26 AML other m 2021-03-21T08:47:49.39
IV.EPOZ.HHN. ML:2.8 0.00908 0.9 AML other m 2021-03-21T08:47:49.90
IV.EMPL.HHE. ML:2.3 0.0017251045 0.224 AML other m 2021-03-21T08:47:50.03
IV.EMPL.HHN. ML:2.2 0.0012620315 0.8384 AML other m 2021-03-21T08:47:50.60
IV.ECTS.HHN. ML:2.4 0.0023599999999999997 1 AML other m 2021-03-21T08:47:50.58
IV.EPOZ.HHE. ML:2.6 0.006115000000000001 1.16 AML other m 2021-03-21T08:47:50.18
IV.ECTS.HHE. ML:2.3 0.00206 1.22 AML other m 2021-03-21T08:47:51.95
IV.ENIC.HHN. ML:2.6 0.0035549999999999996 0.26 AML other m 2021-03-21T08:47:53.25
IV.ENIC.HNN. ML:2.7 0.004305 0.22 AML other m 2021-03-21T08:47:53.28
IV.ENIC.HHE. ML:2.6 0.003685 0.4 AML other m 2021-03-21T08:47:54.58
IV.AIO.HHE. ML:2.2 0.001001 0.52 AML other m 2021-03-21T08:47:55.62
IV.EPZF.HHE. ML:2.6 0.002065 1.02 AML other m 2021-03-21T08:47:55.58
IV.AIO.HHN. ML:2.1 0.0008269999999999999 0.34 AML other m 2021-03-21T08:47:55.55
IV.EMSG.HHE. ML:2.7 0.00391 1.2 AML other m 2021-03-21T08:47:55.77
IV.EMSG.HHN. ML:2.8 0.00467 0.42 AML other m 2021-03-21T08:47:57.32
IV.ENIC.HNE. ML:2.6 0.0035650000000000005 1.44 AML other m 2021-03-21T08:47:57.74
IV.ESML.HHE. ML:2.2 0.000963 0.44 AML other m 2021-03-21T08:47:58.34
IV.ESML.HNE. ML:2.2 0.0009605 0.42 AML other m 2021-03-21T08:47:58.35
IV.NOV.HHN. ML:2.5 0.001595 0.3 AML other m 2021-03-21T08:47:58.50
IV.NOV.HHE. ML:2.7 0.00244 0.34 AML other m 2021-03-21T08:47:58.82
IV.ESML.HNN. ML:2.2 0.0007495000000000001 0.42 AML other m 2021-03-21T08:47:59.35
IV.ESML.HHN. ML:2.2 0.0007650000000000001 0.62 AML other m 2021-03-21T08:47:59.36
IV.ESCV.HHE. ML:2.4 0.0013325 0.3 AML other m 2021-03-21T08:47:59.73
IV.MUCR.HHN. ML:2.2 0.0004915000000000001 0.6 AML other m 2021-03-21T08:48:01.02
IV.EPZF.HHN. ML:2.6 0.0024249999999999996 0.42 AML other m 2021-03-21T08:48:01.08
IV.HCRL.HHE. ML:2.1 0.000297322 0.2816 AML other m 2021-03-21T08:48:01.91
IV.MUCR.HHE. ML:2.0 0.00038849999999999996 0.64 AML other m 2021-03-21T08:48:02.11
IV.HCRL.HHN. ML:2.0 0.00027138345 0.3392 AML other m 2021-03-21T08:48:02.65
IV.ESCV.HHN. ML:2.4 0.001444 0.52 AML other m 2021-03-21T08:48:06.35
IV.GALF.HHE. ML:2.4 0.0007124999999999999 0.82 AML other m 2021-03-21T08:48:07.31
IV.MSRU.HHN. ML:2.1 0.000237 0.72 AML other m 2021-03-21T08:48:08.49
IV.MSRU.HHE. ML:2.3 0.00034050000000000004 0.82 AML other m 2021-03-21T08:48:09.56
IV.GALF.HHN. ML:2.6 0.0011045 0.74 AML other m 2021-03-21T08:48:12.61
MN.CEL.HHE. ML:2.1 0.0001438 0.56 AML other m 2021-03-21T08:48:20.35
MN.CEL.HHN. ML:2.0 0.00014000000000000001 0.76 AML other m 2021-03-21T08:48:20.33
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