Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 22-01-2021 and time 16:16:57 (Italy) in region 10 km W Zafferana Etnea (CT)

A magnitude ML 2.1 earthquake occured in region: 10 km W Zafferana Etnea (CT), on

  • 22-01-2021 15:16:57 (UTC)
  • 22-01-2021 16:16:57 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7360, 15.0030 at 8 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
Zafferana Etnea CT 10 9517 9517
Milo CT 10 1087 10604
Sant'Alfio CT 13 1582 12186
Ragalna CT 13 3924 16110
Santa Venerina CT 13 8592 24702
Nicolosi CT 14 7463 32165
Pedara CT 14 14102 46267
Trecastagni CT 15 10910 57177
Biancavilla CT 16 24007 81184
Maletto CT 16 3920 85104
Giarre CT 16 27659 112763
Bronte CT 16 19172 131935
Belpasso CT 16 28108 160043
Viagrande CT 16 8563 168606
Randazzo CT 17 10900 179506
Santa Maria di Licodia CT 17 7641 187147
Adrano CT 17 36122 223269
Linguaglossa CT 17 5403 228672
Mascali CT 17 14282 242954
Piedimonte Etneo CT 17 3963 246917
Riposto CT 18 14838 261755
Aci Bonaccorsi CT 18 3524 265279
Aci Sant'Antonio CT 18 17984 283263
San Pietro Clarenza CT 18 7743 291006
Mascalucia CT 19 31958 322964
Tremestieri Etneo CT 19 20589 343553
Moio Alcantara ME 19 717 344270
Camporotondo Etneo CT 19 5023 349293
Aci Catena CT 19 29851 379144
Fiumefreddo di Sicilia CT 19 9623 388767
San Giovanni la Punta CT 19 23060 411827
Castiglione di Sicilia CT 20 3215 415042
Paternò CT 20 48228 463270
Acireale CT 20 52622 515892

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km NW of Acireale (52622 inhabitants)
27 Km N of Catania (314555 inhabitants)
70 Km SW of Reggio di Calabria (183035 inhabitants)
70 Km SW of Messina (238439 inhabitants)
79 Km NW of Siracusa (122291 inhabitants)
87 Km E of Caltanissetta (63360 inhabitants)
93 Km N of Ragusa (73313 inhabitants)
97 Km NE of Vittoria (63339 inhabitants)
100 Km N of Modica (54633 inhabitants)
100 Km NE of Gela (75827 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 2021-01-22
15:16:57		 37.7363 15.0032 8 2021-07-12
16:54:57		 Bollettino Sismico Italiano INGV 86788751
Reviewed
Rev200 		ML 1.7 2021-01-22
15:16:57		 37.74 14.997 4 2021-03-09
12:06:37		 Sala Operativa INGV_OE (Catania) 86459471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-22 15:16:57 ± 0.09
Latitude 37.7363 ± 0.0036
Longitude 15.0032 ± 0.0045
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86788751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 386
Semi-minor axis of confidence ellipse (meter) 181
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 298
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 42
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 34
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.01709
Epicentral distance of station farthest from the epicenter (degree) 0.40110
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:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 86788751
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-09 12:06:29

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 86459471
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-01-22 15:26:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HLNI.HHZ. 2021-01-22T15:17:06.03 0.6 negative manual P 195 44.5221 50 -0.53 42
IV.GALF.HHZ. 2021-01-22T15:17:05.68 0.6 undecidable manual P 266 38.4282 50 0.06 48
IV.MUCR.HHE. 2021-01-22T15:17:05.17 0.1 negative manual P 342 35.8419 102 0 97
IV.ECTS.HHZ. 2021-01-22T15:17:04.94 0.6 undecidable manual S 33 19.1697 112 -0.05 49
IV.AIO.HHZ. 2021-01-22T15:17:04.83 0.3 undecidable manual P 38 32.9448 103 0.22 70
IV.ENIC.HHZ. 2021-01-22T15:17:03.09 0.6 undecidable manual S 172 11.7771 123 0.4 46
IV.ECZM.HHN. 2021-01-22T15:17:02.14 0.3 undecidable manual S 266 8.6802 131 0.3 72
IV.EFIU.HHE. 2021-01-22T15:17:02.39 0.1 undecidable manual P 72 19.0698 112 0.44 91
IV.EMFO.HHZ. 2021-01-22T15:17:01.47 0.6 undecidable manual S 90 7.6812 135 -0.1 50
IV.EPOZ.HHZ. 2021-01-22T15:17:01.88 0.6 undecidable manual P 114 17.7711 113 0.17 48
IV.EPZF.HHZ. 2021-01-22T15:17:01.51 0.6 negative manual P 307 16.0728 115 0.12 49
IV.ENIC.HHZ. 2021-01-22T15:17:01.24 0.6 undecidable manual P 172 11.7771 123 0.6 44
IV.ECTS.HHZ. 2021-01-22T15:17:01.72 0.3 undecidable manual P 33 19.1697 112 -0.25 71
IV.ESCV.HHN. 2021-01-22T15:17:01.36 0.6 undecidable manual P 274 16.5723 115 -0.12 49
IV.ESPC.HHN. 2021-01-22T15:17:01.01 0.3 undecidable manual S 156 5.2947 145 -0.04 76
IV.ESVO.HHE. 2021-01-22T15:17:01.70 0.3 undecidable manual S 310 6.3936 140 0.42 70
IV.EMPL.HHZ. 2021-01-22T15:17:01.53 0.3 undecidable manual S 204 6.993 137 0.12 75
IV.EMCN.HNZ. 2021-01-22T15:17:01.28 0.6 undecidable manual S 24 6.6933 139 -0.06 50
IV.ESML.HHZ. 2021-01-22T15:17:01.94 0.3 undecidable manual P 220 17.0718 114 0.37 70
IV.ESLN.HHZ. 2021-01-22T15:17:00.56 0.6 undecidable manual S 208 5.3946 145 -0.51 46
IV.EPIT.HHN. 2021-01-22T15:17:00.40 0.3 undecidable manual P 29 9.5793 129 0.12 74
IV.ECBD.HHN. 2021-01-22T15:17:00.24 0.1 undecidable manual P 56 8.7801 131 0.08 100
IV.EMNR.HHZ. 2021-01-22T15:17:00.14 0.3 undecidable manual P 13 9.1797 130 -0.08 75
IV.EMSG.HHZ. 2021-01-22T15:17:00.46 0.6 positive manual P 334 10.4784 126 0.04 50
IV.EMFS.HHE. 2021-01-22T15:17:00.55 0.3 undecidable manual S 194 1.8981 166 0 77
IV.ECHR.HHE. 2021-01-22T15:17:00.38 0.1 negative manual P 235 9.6792 128 0.08 100
IV.ESPC.HHN. 2021-01-22T15:16:59.48 0.1 positive manual P 156 5.2947 145 -0.21 98
IV.ESVO.HHE. 2021-01-22T15:16:59.50 0.3 undecidable manual P 310 6.3936 140 -0.32 72
IV.EMPL.HHZ. 2021-01-22T15:16:59.74 0.3 undecidable manual P 204 6.993 137 -0.16 74
IV.EMCN.HNZ. 2021-01-22T15:16:59.69 0.3 undecidable manual P 24 6.6933 139 -0.17 74
IV.EMFS.HHE. 2021-01-22T15:16:59.23 0.1 undecidable manual P 194 1.8981 166 -0.17 99
IV.ESLN.HHZ. 2021-01-22T15:16:59.26 1.0 positive manual P 208 5.3946 145 -0.44 23
IV.EMFO.HHZ. 2021-01-22T15:16:59.79 0.1 undecidable manual P 90 7.6812 135 -0.2 98
IV.ECZM.HHN. 2021-01-22T15:16:59.85 0.1 negative manual P 266 8.6802 131 -0.3 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EMSG.HHE. ML:2.1 0.001887988 0.2944 AML other m 2021-01-22T15:17:03.88
IV.ESML.HHE. ML:2.1 0.00113 1.62 AML other m 2021-01-22T15:17:06.10
IV.EMSG.HHN. ML:2.1 0.0019823975 0.2816 AML other m 2021-01-22T15:17:06.81
IV.EPZF.HHE. ML:1.9 0.0008534999999999999 0.28 AML other m 2021-01-22T15:17:07.34
IV.EPZF.HHN. ML:2.1 0.00120853365 0.5376 AML other m 2021-01-22T15:17:07.87
IV.ESML.HHN. ML:2.0 0.000915 0.32 AML other m 2021-01-22T15:17:13.10
IV.GALF.HHN. ML:2.4 0.00084768935 0.4608 AML other m 2021-01-22T15:17:14.70
IV.GALF.HNE. ML:1.5 0.00010451369500000001 0.4608 AML other m 2021-01-22T15:17:14.98
IV.GALF.HHE. ML:2.3 0.000797 0.44 AML other m 2021-01-22T15:17:18.77
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