Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 21-03-2021 and time 07:57:34 (UTC) in region 2 km NE Sant'Alfio (CT)

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

  • 21-03-2021 07:57:34 (UTC)
  • 21-03-2021 08:57:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7550, 15.1590 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 2 1582 1582
Mascali CT 3 14282 15864
Giarre CT 4 27659 43523
Riposto CT 5 14838 58361
Milo CT 5 1087 59448
Piedimonte Etneo CT 6 3963 63411
Fiumefreddo di Sicilia CT 6 9623 73034
Santa Venerina CT 8 8592 81626
Zafferana Etnea CT 8 9517 91143
Linguaglossa CT 10 5403 96546
Calatabiano CT 10 5308 101854
Gaggi ME 13 3184 105038
Giardini-Naxos ME 14 9415 114453
Castiglione di Sicilia CT 15 3215 117668
Taormina ME 15 10960 128628
Castelmola ME 16 1088 129716
Acireale CT 16 52622 182338
Motta Camastra ME 16 845 183183
Graniti ME 16 1492 184675
Francavilla di Sicilia ME 17 3945 188620
Trecastagni CT 17 10910 199530
Aci Sant'Antonio CT 17 17984 217514
Viagrande CT 17 8563 226077
Aci Catena CT 17 29851 255928
Pedara CT 18 14102 270030
Aci Bonaccorsi CT 18 3524 273554
Moio Alcantara ME 19 717 274271
Letojanni ME 19 2861 277132
Nicolosi CT 19 7463 284595
Mongiuffi Melia ME 20 600 285195
Valverde CT 20 7840 293035

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km N of Acireale (52622 inhabitants)
29 Km N of Catania (314555 inhabitants)
58 Km SW of Reggio di Calabria (183035 inhabitants)
60 Km SW of Messina (238439 inhabitants)
78 Km N of Siracusa (122291 inhabitants)
100 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 2021-03-21
07:57:34		 37.755 15.1588 9 2021-07-12
16:55:15		 Bollettino Sismico Italiano INGV 91274741
Reviewed
Rev200 		ML 1.9 2021-03-21
07:57:33		 37.76 15.134 7 2021-06-14
13:33:19		 Sala Operativa INGV_OE (Catania) 88341061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-21 07:57:34 ± 0.12
Latitude 37.7550 ± 0.0054
Longitude 15.1588 ± 0.0068
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91274741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 669
Semi-minor axis of confidence ellipse (meter) 234
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 295
Circular confidence region, given by single value of horizontal uncertainty (meter) 670.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
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) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.01889
Epicentral distance of station farthest from the epicenter (degree) 0.60075
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 24
Type of magnitude ML
Reference to an origin 91274741
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-14 13:33:02

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 88341061
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-03-21 08:11:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SSY.HHE. 2021-03-21T07:57:46.93 0.3 undecidable manual P 186 66.6777 50 0.84 54
IV.MUCR.HHZ. 2021-03-21T07:57:42.05 0.3 undecidable manual P 322 40.5261 50 -0.01 72
IV.EMSG.HHN. 2021-03-21T07:57:42.37 0.6 undecidable manual S 292 19.7691 114 0.82 39
IV.MPNC.HHN. 2021-03-21T07:57:42.85 0.3 undecidable manual P 21 46.62 50 -0.15 69
IV.ESCV.HHE. 2021-03-21T07:57:41.00 0.3 undecidable manual P 268 30.1476 106 0.64 62
IV.ECTS.HHZ. 2021-03-21T07:57:40.42 0.6 undecidable manual S 347 14.4744 121 0.5 45
IV.NOV.HHE. 2021-03-21T07:57:40.09 0.3 undecidable manual P 356 30.3474 106 -0.31 69
IV.EMPL.HHE. 2021-03-21T07:57:40.78 0.6 undecidable manual S 243 18.5703 115 -0.4 46
IV.ESLN.HHZ. 2021-03-21T07:57:40.86 0.6 undecidable manual S 247 17.5713 116 -0.01 50
IV.EPIT.HHN. 2021-03-21T07:57:39.72 0.6 undecidable manual S 305 10.878 128 0.82 40
IV.EPZF.HHE. 2021-03-21T07:57:39.87 0.3 undecidable manual P 286 27.5502 107 0.01 73
IV.ESPC.HHN. 2021-03-21T07:57:39.52 0.6 undecidable manual S 239 13.4754 123 -0.1 49
IV.ECHR.HHE. 2021-03-21T07:57:39.20 0.6 undecidable manual P 251 22.8549 111 0.22 47
IV.EMCN.HHN. 2021-03-21T07:57:39.60 0.6 undecidable manual S 290 11.6772 126 0.48 45
IV.EPOZ.HHE. 2021-03-21T07:57:39.17 0.6 undecidable manual S 164 9.5793 132 0.62 43
IV.AIO.HHZ. 2021-03-21T07:57:39.22 0.1 undecidable manual P 15 24.8529 109 -0.13 96
IV.ECBD.HHN. 2021-03-21T07:57:38.08 0.6 undecidable manual S 294 6.8931 141 0.17 49
IV.ECZM.HHN. 2021-03-21T07:57:38.90 0.3 undecidable manual P 263 22.4553 111 0 74
IV.ENIC.HHZ. 2021-03-21T07:57:38.91 0.3 undecidable manual P 221 18.2706 115 0.79 60
IV.EFIU.HHE. 2021-03-21T07:57:38.50 0.6 undecidable manual S 50 5.8941 145 0.8 41
IV.ESVO.HHE. 2021-03-21T07:57:38.45 0.3 undecidable manual P 276 18.6702 115 0.25 71
IV.EVRN.HHZ. 2021-03-21T07:57:38.33 0.6 undecidable manual S 196 7.5813 139 0.27 48
IV.EMSG.HHN. 2021-03-21T07:57:38.53 0.3 undecidable manual P 292 19.7691 114 0.14 72
IV.ESAL.HHE. 2021-03-21T07:57:37.11 0.6 undecidable manual S 270 2.0979 166 -0.05 51
IV.EMFS.HHE. 2021-03-21T07:57:37.01 0.3 undecidable manual P 255 14.6742 120 -0.47 68
IV.EMFO.HHE. 2021-03-21T07:57:37.57 0.6 undecidable manual S 250 6.3936 143 -0.23 48
IV.ECTS.HHZ. 2021-03-21T07:57:37.16 0.1 undecidable manual P 347 14.4744 121 -0.29 94
IV.EMPL.HHE. 2021-03-21T07:57:37.78 0.3 undecidable manual P 243 18.5703 115 -0.4 69
IV.ESLN.HHZ. 2021-03-21T07:57:37.49 0.3 undecidable manual P 247 17.5713 116 -0.51 67
IV.EVRN.HHZ. 2021-03-21T07:57:36.14 0.1 positive manual P 196 7.5813 139 -0.23 97
IV.ECBD.HHN. 2021-03-21T07:57:36.01 0.1 undecidable manual P 294 6.8931 141 -0.28 96
IV.EPIT.HHN. 2021-03-21T07:57:36.90 0.1 undecidable manual P 305 10.878 128 0.04 100
IV.ESPC.HHN. 2021-03-21T07:57:36.77 0.3 undecidable manual P 239 13.4754 123 -0.51 67
IV.EFIU.HHE. 2021-03-21T07:57:36.09 0.1 undecidable manual P 50 5.8941 145 -0.08 100
IV.EMCN.HHN. 2021-03-21T07:57:36.91 0.1 undecidable manual P 290 11.6772 126 -0.08 99
IV.EPOZ.HHE. 2021-03-21T07:57:36.87 0.1 undecidable manual P 164 9.5793 132 0.21 97
IV.ESAL.HHE. 2021-03-21T07:57:35.40 0.1 undecidable manual P 270 2.0979 166 -0.45 93
IV.EMFO.HHE. 2021-03-21T07:57:35.77 0.1 undecidable manual P 250 6.3936 143 -0.46 92
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EVRN.HNE. ML:2.5 0.00543 0.28 AML other m 2021-03-21T07:57:38.49
IV.EVRN.HHN. ML:2.5 0.005195 1.04 AML other m 2021-03-21T07:57:39.46
IV.EPIT.HHE. ML:2.7 0.00689 1.7 AML other m 2021-03-21T07:57:39.99
IV.EPIT.HHN. ML:2.7 0.00704 0.24 AML other m 2021-03-21T07:57:40.12
IV.EVRN.HHE. ML:2.5 0.005345 0.42 AML other m 2021-03-21T07:57:40.85
IV.EPOZ.HHE. ML:2.0 0.00133 1.5 AML other m 2021-03-21T07:57:40.17
IV.ECTS.HHE. ML:1.8 0.0006405000000000001 0.92 AML other m 2021-03-21T07:57:41.27
IV.EVRN.HNN. ML:2.6 0.006539999999999999 1.46 AML other m 2021-03-21T07:57:41.07
IV.ECTS.HHN. ML:1.8 0.000632 1.14 AML other m 2021-03-21T07:57:42.03
IV.EPOZ.HHN. ML:2.1 0.00177 0.34 AML other m 2021-03-21T07:57:44.20
IV.EMSG.HHN. ML:2.3 0.001435 0.36 AML other m 2021-03-21T07:57:45.20
IV.ENIC.HHE. ML:2.2 0.0013399999999999998 0.2 AML other m 2021-03-21T07:57:45.36
IV.NOV.HHE. ML:2.2 0.0008445 1.54 AML other m 2021-03-21T07:57:46.77
IV.ENIC.HHN. ML:2.1 0.0011075 1.08 AML other m 2021-03-21T07:57:46.01
IV.AIO.HHE. ML:1.7 0.0003145 0.54 AML other m 2021-03-21T07:57:46.06
IV.AIO.HHN. ML:1.8 0.000383 0.32 AML other m 2021-03-21T07:57:46.28
IV.EMSG.HHE. ML:2.2 0.0013399999999999998 1.24 AML other m 2021-03-21T07:57:47.12
IV.ESCV.HHN. ML:2.0 0.0005095 1.5 AML other m 2021-03-21T07:57:49.15
IV.NOV.HHN. ML:2.1 0.0006454999999999999 0.42 AML other m 2021-03-21T07:57:50.59
IV.MPNC.HHE. ML:2.0 0.000284 0.46 AML other m 2021-03-21T07:57:51.27
IV.MUCR.HHN. ML:1.6 0.00014399999999999998 1.58 AML other m 2021-03-21T07:57:52.05
IV.ESCV.HHE. ML:2.0 0.00044500000000000003 1.64 AML other m 2021-03-21T07:57:53.96
IV.MUCR.HHE. ML:1.6 0.00013295 0.46 AML other m 2021-03-21T07:57:54.92
IV.MPNC.HHN. ML:1.9 0.0002175 1.2 AML other m 2021-03-21T07:58:00.93
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