Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 22-03-2021 and time 15:06:52 (Italy) in region 1 km E Sant'Alfio (CT)

A magnitude ML 1.7 earthquake occured in region: 1 km E Sant'Alfio (CT), on

  • 22-03-2021 14:06:52 (UTC)
  • 22-03-2021 15:06:52 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7480, 15.1580 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 3 27659 29241
Mascali CT 4 14282 43523
Riposto CT 4 14838 58361
Milo CT 5 1087 59448
Fiumefreddo di Sicilia CT 7 9623 69071
Santa Venerina CT 7 8592 77663
Piedimonte Etneo CT 7 3963 81626
Zafferana Etnea CT 8 9517 91143
Linguaglossa CT 11 5403 96546
Calatabiano CT 11 5308 101854
Gaggi ME 14 3184 105038
Giardini-Naxos ME 15 9415 114453
Acireale CT 15 52622 167075
Castiglione di Sicilia CT 15 3215 170290
Aci Sant'Antonio CT 16 17984 188274
Taormina ME 16 10960 199234
Trecastagni CT 16 10910 210144
Aci Catena CT 16 29851 239995
Viagrande CT 16 8563 248558
Castelmola ME 16 1088 249646
Motta Camastra ME 17 845 250491
Pedara CT 17 14102 264593
Graniti ME 17 1492 266085
Aci Bonaccorsi CT 17 3524 269609
Francavilla di Sicilia ME 17 3945 273554
Nicolosi CT 19 7463 281017
Valverde CT 19 7840 288857
Moio Alcantara ME 19 717 289574
Letojanni ME 20 2861 292435
San Giovanni la Punta CT 20 23060 315495

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 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)
77 Km N of Siracusa (122291 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 1.7 2021-03-22
14:06:52		 37.7482 15.1585 9 2021-07-12
16:55:05		 Bollettino Sismico Italiano INGV 88880061
Reviewed
Rev200 		ML 1.8 2021-03-22
14:06:51		 37.752 15.135 8 2021-06-17
12:53:13		 Sala Operativa INGV_OE (Catania) 88381681
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-22 14:06:52 ± 0.07
Latitude 37.7482 ± 0.0036
Longitude 15.1585 ± 0.0045
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 88880061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 428
Semi-minor axis of confidence ellipse (meter) 380
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 280
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 118
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.02068
Epicentral distance of station farthest from the epicenter (degree) 0.59355
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 88880061
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-07 10:37:44

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 88381681
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-03-22 14:18:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SSY.HHE. 2021-03-22T14:07:04.40 0.6 undecidable manual P 187 65.8896 50 0.33 42
IV.NOV.HHZ. 2021-03-22T14:07:03.73 0.3 undecidable manual S 356 31.0467 50 0.31 68
IV.MPNC.HHN. 2021-03-22T14:07:01.34 0.3 undecidable manual P 21 47.3193 50 0.14 68
IV.MUCR.HHZ. 2021-03-22T14:07:00.16 0.3 undecidable manual P 323 41.1255 50 -0.09 70
IV.EPZF.HHZ. 2021-03-22T14:06:58.30 0.6 negative manual P 288 27.75 108 0.19 46
IV.ESCV.HHE. 2021-03-22T14:06:58.46 1.0 undecidable manual P 270 30.1476 50 -0.09 24
IV.ESLN.HHZ. 2021-03-22T14:06:58.90 0.6 undecidable manual S 249 17.2716 118 -0.14 48
IV.NOV.HHZ. 2021-03-22T14:06:58.46 0.3 undecidable manual P 356 31.0467 50 -0.24 69
IV.EMFS.HHZ. 2021-03-22T14:06:58.31 0.6 undecidable manual S 257 14.4744 123 0.11 48
IV.EMCN.HHZ. 2021-03-22T14:06:58.00 0.3 undecidable manual S 294 11.9769 128 0.51 67
IV.EPIT.HHN. 2021-03-22T14:06:57.88 0.6 undecidable manual S 308 11.3775 129 0.56 44
IV.ECZM.HHZ. 2021-03-22T14:06:57.30 0.6 undecidable manual P 265 22.3554 112 0.2 47
IV.AIO.HHZ. 2021-03-22T14:06:57.52 1.0 positive manual P 15 25.5522 110 -0.18 23
IV.EMSG.HHZ. 2021-03-22T14:06:56.34 1.0 negative manual P 294 19.9689 115 -0.32 23
IV.EFIU.HHZ. 2021-03-22T14:06:56.29 0.3 undecidable manual S 45 6.4935 145 0.13 73
IV.ECBD.HHZ. 2021-03-22T14:06:56.44 0.3 undecidable manual S 299 7.2927 142 0.12 73
IV.EMPL.HHN. 2021-03-22T14:06:56.26 0.6 undecidable manual P 245 18.1707 117 -0.08 48
IV.ESVO.HHZ. 2021-03-22T14:06:56.62 0.3 undecidable manual P 279 18.7701 116 0.18 71
IV.EVRN.HNZ. 2021-03-22T14:06:56.50 0.3 undecidable manual S 197 6.7932 143 0.27 71
IV.EPOZ.HHZ. 2021-03-22T14:06:56.91 0.3 undecidable manual S 163 8.88 136 0.23 71
IV.ESLN.HHZ. 2021-03-22T14:06:55.82 0.3 undecidable manual P 249 17.2716 118 -0.35 69
IV.ESPC.HHZ. 2021-03-22T14:06:55.09 0.3 undecidable manual P 242 13.0758 125 -0.36 69
IV.EPOZ.HHZ. 2021-03-22T14:06:55.18 0.3 undecidable manual P 163 8.88 136 0.37 69
IV.EMFS.HHZ. 2021-03-22T14:06:55.52 0.3 undecidable manual P 257 14.4744 123 -0.16 72
IV.ECTS.HHE. 2021-03-22T14:06:55.45 0.3 undecidable manual P 348 15.1737 121 -0.37 69
IV.EMCN.HHZ. 2021-03-22T14:06:55.28 0.3 undecidable manual P 294 11.9769 128 0.01 74
IV.ESAL.HHZ. 2021-03-22T14:06:55.38 0.6 undecidable manual S 290 2.2977 166 -0.16 49
IV.EMFO.HHZ. 2021-03-22T14:06:55.98 0.3 undecidable manual S 257 6.1938 146 -0.11 74
IV.EPIT.HHN. 2021-03-22T14:06:55.25 0.1 undecidable manual P 308 11.3775 129 0.07 98
IV.ECNE.HHZ. 2021-03-22T14:06:55.77 0.3 undecidable manual P 278 13.875 124 0.18 72
IV.EVRN.HNZ. 2021-03-22T14:06:54.54 0.1 undecidable manual P 197 6.7932 143 -0.01 100
IV.EFIU.HHZ. 2021-03-22T14:06:54.43 0.1 negative manual P 45 6.4935 145 -0.08 99
IV.ECBD.HHZ. 2021-03-22T14:06:54.40 0.1 negative manual P 299 7.2927 142 -0.2 96
IV.EMFO.HHZ. 2021-03-22T14:06:54.18 0.1 undecidable manual P 257 6.1938 146 -0.29 94
IV.ESAL.HHZ. 2021-03-22T14:06:53.80 0.1 negative manual P 290 2.2977 166 -0.35 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EVRN.HHE. ML:0.0 0.002668918 0.3392 AML other m 2021-03-22T14:06:56.92
IV.EVRN.HHN. ML:0.0 0.0013349579999999998 0.6016 AML other m 2021-03-22T14:06:56.86
IV.AIO.HHE. ML:1.2 0.000099109125 0.576 AML other m 2021-03-22T14:07:01.96
IV.AIO.HHN. ML:1.4 0.00014655055 0.5184 AML other m 2021-03-22T14:07:02.36
IV.MPNC.HHE. ML:1.8 0.00018672395 0.5184 AML other m 2021-03-22T14:07:08.29
IV.MPNC.HHN. ML:1.6 0.000116678125 1.3568 AML other m 2021-03-22T14:07:08.06
IV.ESAL.HHE. ML:0.0 0.004292959 0.1024 AML other m 2021-03-22T14:06:55.73
IV.ESAL.HHN. ML:0.0 0.005119877500000001 0.2176 AML other m 2021-03-22T14:06:55.47
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