Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.3 on date 19-03-2021 and time 18:56:42 (Italy) in region 1 km SW Sant'Alfio (CT)

A magnitude ML 2.3 earthquake occured in region: 1 km SW Sant'Alfio (CT), on

  • 19-03-2021 17:56:42 (UTC)
  • 19-03-2021 18:56:42 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7360, 15.1400 at 7 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 4 27659 30328
Santa Venerina CT 5 8592 38920
Mascali CT 6 14282 53202
Zafferana Etnea CT 6 9517 62719
Riposto CT 6 14838 77557
Fiumefreddo di Sicilia CT 9 9623 87180
Piedimonte Etneo CT 9 3963 91143
Linguaglossa CT 12 5403 96546
Calatabiano CT 13 5308 101854
Acireale CT 14 52622 154476
Trecastagni CT 14 10910 165386
Aci Sant'Antonio CT 14 17984 183370
Viagrande CT 14 8563 191933
Aci Catena CT 15 29851 221784
Pedara CT 15 14102 235886
Aci Bonaccorsi CT 16 3524 239410
Gaggi ME 16 3184 242594
Castiglione di Sicilia CT 16 3215 245809
Nicolosi CT 17 7463 253272
Giardini-Naxos ME 17 9415 262687
Valverde CT 17 7840 270527
San Giovanni la Punta CT 18 23060 293587
Motta Camastra ME 18 845 294432
Taormina ME 18 10960 305392
Castelmola ME 18 1088 306480
Francavilla di Sicilia ME 18 3945 310425
Tremestieri Etneo CT 19 20589 331014
Graniti ME 19 1492 332506
San Gregorio di Catania CT 19 11966 344472
Mascalucia CT 20 31958 376430
Moio Alcantara ME 20 717 377147
Aci Castello CT 20 18723 395870

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km N of Acireale (52622 inhabitants)
26 Km N of Catania (314555 inhabitants)
61 Km SW of Reggio di Calabria (183035 inhabitants)
63 Km SW of Messina (238439 inhabitants)
76 Km N of Siracusa (122291 inhabitants)
97 Km NE of Ragusa (73313 inhabitants)
99 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 2.3 2021-03-19
17:56:42		 37.7365 15.1395 7 2021-07-12
16:55:10		 Bollettino Sismico Italiano INGV 89992281
Reviewed
Rev200 		ML 2.3 2021-03-19
17:56:42		 37.749 15.114 5 2021-06-04
23:30:18		 Sala Operativa INGV_OE (Catania) 88285801
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-19 17:56:42 ± 0.15
Latitude 37.7365 ± 0.0054
Longitude 15.1395 ± 0.0068
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89992281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 646
Semi-minor axis of confidence ellipse (meter) 198
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 310
Circular confidence region, given by single value of horizontal uncertainty (meter) 650.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 31
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) 0.01889
Epicentral distance of station farthest from the epicenter (degree) 0.37142
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:2.3

Field Value
Value 2.3
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 89992281
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-11 14:44:44

ML:2.3

Field Value
Value 2.3
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 88285801
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-03-19 18:19:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.AIO.HHZ. 2021-03-19T17:56:52.40 0.3 undecidable manual S 17 27.2505 104 0.03 72
IV.MUCR.HHE. 2021-03-19T17:56:51.72 1.0 undecidable manual P 326 41.2254 50 0.77 19
IV.NOV.HHZ. 2021-03-19T17:56:49.35 1.0 undecidable manual P 360 32.3454 102 0.12 23
IV.EPZF.HHZ. 2021-03-19T17:56:48.50 0.3 undecidable manual P 291 26.5512 104 0.38 67
IV.ESCV.HHZ. 2021-03-19T17:56:48.54 0.6 undecidable manual P 272 28.4493 103 0.06 48
IV.AIO.HHZ. 2021-03-19T17:56:48.01 0.6 undecidable manual P 17 27.2505 104 -0.24 46
IV.ESML.HHZ. 2021-03-19T17:56:47.90 0.6 undecidable manual P 240 26.3514 104 -0.17 47
IV.EPIT.HHZ. 2021-03-19T17:56:47.80 0.3 undecidable manual S 319 10.9779 121 0.71 62
IV.EFIU.HHZ. 2021-03-19T17:56:47.00 0.6 undecidable manual S 47 8.5803 128 0.61 43
IV.ENIC.HHZ. 2021-03-19T17:56:46.54 0.3 undecidable manual P 222 15.5733 113 0.52 66
IV.EMPL.HHZ. 2021-03-19T17:56:46.18 1.0 undecidable manual P 247 16.1727 112 0.06 24
IV.ESVO.HHZ. 2021-03-19T17:56:46.92 0.6 undecidable manual P 284 17.3715 111 0.57 43
IV.ECBD.HHZ. 2021-03-19T17:56:46.00 0.6 undecidable manual S 316 6.6933 135 0.09 49
IV.EMSG.HHZ. 2021-03-19T17:56:46.79 0.3 undecidable manual P 299 19.0698 109 0.12 72
IV.ECZM.HHZ. 2021-03-19T17:56:46.92 0.3 undecidable manual P 268 20.6682 108 -0.05 73
IV.EMFO.HHZ. 2021-03-19T17:56:45.50 0.3 undecidable manual S 269 4.2957 147 0.12 74
IV.ESAL.HHZ. 2021-03-19T17:56:45.10 0.3 undecidable manual S 348 2.0979 162 0.05 75
IV.EPOZ.HHZ. 2021-03-19T17:56:45.19 0.1 undecidable manual P 149 8.3805 129 0.43 92
IV.ECPN.HHZ. 2021-03-19T17:56:45.33 0.6 undecidable manual P 273 13.4754 116 -0.3 47
IV.EMNR.HHZ. 2021-03-19T17:56:45.65 0.3 undecidable manual P 312 13.3755 117 0.04 74
IV.EPIT.HHZ. 2021-03-19T17:56:45.15 0.1 undecidable manual P 319 10.9779 121 -0.05 99
IV.EMCN.HHZ. 2021-03-19T17:56:45.03 0.1 undecidable manual P 303 11.0778 121 -0.18 96
IV.ECTS.HHZ. 2021-03-19T17:56:45.68 0.1 undecidable manual P 354 16.1727 112 -0.46 90
IV.ECNE.HHZ. 2021-03-19T17:56:45.66 0.3 undecidable manual P 285 12.4764 118 0.2 72
IV.EFIU.HHZ. 2021-03-19T17:56:44.68 0.1 undecidable manual P 47 8.5803 128 -0.12 98
IV.ECBD.HHZ. 2021-03-19T17:56:44.11 0.3 undecidable manual P 316 6.6933 135 -0.41 69
IV.EVRN.HNZ. 2021-03-19T17:56:44.28 0.1 undecidable manual P 184 5.2947 142 -0.04 100
IV.EMFS.HHZ. 2021-03-19T17:56:44.89 0.3 undecidable manual P 261 12.5763 118 -0.58 65
IV.ESPC.HHZ. 2021-03-19T17:56:44.76 0.3 undecidable manual P 244 10.9779 121 -0.43 68
IV.ESAL.HHZ. 2021-03-19T17:56:43.61 0.1 undecidable manual P 348 2.0979 162 -0.41 93
IV.EMFO.HHZ. 2021-03-19T17:56:43.89 0.6 undecidable manual P 269 4.2957 147 -0.32 47
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EFIU.HHN. ML:2.3 0.00328392825 0.256 AML other m 2021-03-19T17:56:48.01
IV.EFIU.HHE. ML:2.2 0.0028010435 0.256 AML other m 2021-03-19T17:56:48.40
IV.EPOZ.HHE. ML:2.2 0.003191014 0.2816 AML other m 2021-03-19T17:56:48.53
IV.EPOZ.HHN. ML:2.5 0.006489433 0.2048 AML other m 2021-03-19T17:56:49.16
IV.ECTS.HHN. ML:2.2 0.0017470440000000003 0.256 AML other m 2021-03-19T17:56:50.27
IV.ECTS.HHE. ML:2.1 0.001272926 0.3072 AML other m 2021-03-19T17:56:51.16
IV.EMSG.HHN. ML:2.6 0.0033698755 0.2688 AML other m 2021-03-19T17:56:51.35
IV.EMSG.HHE. ML:2.5 0.0024936345000000004 0.2048 AML other m 2021-03-19T17:56:52.40
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