Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 21-10-2020 and time 01:31:42 (Italy) in region 10 km W Zafferana Etnea (CT)

A magnitude ML 1.9 earthquake occured in region: 10 km W Zafferana Etnea (CT), on

  • 20-10-2020 23:31:42 (UTC)
  • 21-10-2020 01:31:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.7370, 15.0010 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
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
Bronte CT 16 19172 100356
Maletto CT 16 3920 104276
Belpasso CT 16 28108 132384
Giarre CT 16 27659 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 18 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
Moio Alcantara ME 19 717 291723
Mascalucia CT 19 31958 323681
Camporotondo Etneo CT 19 5023 328704
Tremestieri Etneo CT 19 20589 349293
Aci Catena CT 19 29851 379144
Fiumefreddo di Sicilia CT 19 9623 388767
Castiglione di Sicilia CT 20 3215 391982
San Giovanni la Punta CT 20 23060 415042
Paternò CT 20 48228 463270

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)
71 Km SW of Messina (238439 inhabitants)
80 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 NE of Gela (75827 inhabitants)
100 Km N of Modica (54633 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 1.9 2020-10-20
23:31:42		 37.7367 15.0013 7 2021-02-26
14:56:11		 Bollettino Sismico Italiano INGV 85511061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-20 23:31:42 ± 0.05
Latitude 37.7367 ± 0.0018
Longitude 15.0013 ± 0.0034
Depth (km) 7 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 85511061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 270
Semi-minor axis of confidence ellipse (meter) 137
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) 270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 51
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 36
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.04856
Epicentral distance of station farthest from the epicenter (degree) 0.78241
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 21
Magnitude information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 20
Type of magnitude ML
Reference to an origin 85511061
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-12-18 08:21:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAVL.HHZ. 2020-10-20T23:32:08.49 0.6 undecidable manual S 173 86.8464 50 -0.21 42
IV.HAVL.HHZ. 2020-10-20T23:31:57.25 0.3 undecidable manual P 173 86.8464 50 -0.27 62
IV.GALF.HHZ. 2020-10-20T23:31:55.54 0.6 undecidable manual S 266 38.2284 50 -0.2 46
IV.MUCR.HHZ. 2020-10-20T23:31:54.68 0.6 undecidable manual S 342 35.742 102 -0.24 46
IV.HAGA.HHZ. 2020-10-20T23:31:52.49 0.6 undecidable manual P 165 51.9036 50 0.36 43
IV.MSFR.HHZ. 2020-10-20T23:31:51.44 0.6 undecidable manual P 313 48.7179 50 -0.21 45
IV.HCRL.HHN. 2020-10-20T23:31:51.96 0.6 undecidable manual P 177 50.4162 50 0.06 46
IV.GALF.HHZ. 2020-10-20T23:31:50.34 0.3 undecidable manual P 266 38.2284 50 0.31 67
IV.HLNI.HHE. 2020-10-20T23:31:50.91 0.6 undecidable manual P 195 44.5221 50 -0.09 46
IV.ECTS.HHZ. 2020-10-20T23:31:49.65 0.6 undecidable manual S 33 19.2696 111 0.26 47
IV.MUCR.HHZ. 2020-10-20T23:31:49.40 0.3 undecidable manual P 342 35.742 102 -0.16 69
IV.ESML.HHZ. 2020-10-20T23:31:49.01 0.3 undecidable manual S 219 16.9719 113 0.35 69
IV.AIO.HHZ. 2020-10-20T23:31:49.29 0.3 undecidable manual P 38 33.0447 103 0.27 68
IV.EPZF.HHZ. 2020-10-20T23:31:48.53 0.6 undecidable manual S 307 15.9729 115 0.19 48
IV.EPOZ.HHZ. 2020-10-20T23:31:48.92 0.6 undecidable manual S 114 17.9709 112 -0.05 49
IV.EVRN.HHZ. 2020-10-20T23:31:47.42 0.3 undecidable manual S 114 12.876 120 0.03 74
IV.EPOZ.HHZ. 2020-10-20T23:31:46.55 0.3 undecidable manual P 114 17.9709 112 0.42 68
IV.ECHR.HNZ. 2020-10-20T23:31:46.82 0.3 undecidable manual S 234 9.5793 128 0.39 69
IV.EMSG.HHZ. 2020-10-20T23:31:46.57 0.3 undecidable manual S 334 10.3785 125 -0.09 74
IV.ECTS.HHZ. 2020-10-20T23:31:46.27 0.3 undecidable manual P 33 19.2696 111 -0.1 72
IV.EPIT.HHZ. 2020-10-20T23:31:46.70 0.3 undecidable manual S 30 9.5793 128 0.26 71
IV.EFIU.HHZ. 2020-10-20T23:31:46.48 1.0 undecidable manual P 72 19.2696 111 0.11 24
IV.ESML.HHZ. 2020-10-20T23:31:46.08 0.1 undecidable manual P 219 16.9719 113 0.13 96
IV.ECBD.HHZ. 2020-10-20T23:31:46.39 0.3 undecidable manual S 57 8.88 130 0.14 73
IV.ENIC.HHZ. 2020-10-20T23:31:46.99 0.3 undecidable manual S 171 11.7771 122 -0.08 74
IV.EPZF.HHZ. 2020-10-20T23:31:45.72 0.3 undecidable manual P 307 15.9729 115 -0.04 74
IV.ENIC.HHZ. 2020-10-20T23:31:45.01 0.3 undecidable manual P 171 11.7771 122 -0.02 75
IV.ESLN.HHZ. 2020-10-20T23:31:45.02 0.3 undecidable manual S 206 5.3946 144 -0.38 70
IV.EMCN.HHZ. 2020-10-20T23:31:45.48 0.3 undecidable manual S 25 6.6933 138 -0.22 72
IV.ECBD.HHZ. 2020-10-20T23:31:44.46 0.3 undecidable manual P 57 8.88 130 -0.1 74
IV.ECHR.HNZ. 2020-10-20T23:31:44.72 0.1 undecidable manual P 234 9.5793 128 0.06 99
IV.EVRN.HHZ. 2020-10-20T23:31:44.99 0.1 undecidable manual P 114 12.876 120 -0.23 95
IV.EMSG.HHZ. 2020-10-20T23:31:44.79 0.1 positive manual P 334 10.3785 125 0 100
IV.EPIT.HHZ. 2020-10-20T23:31:44.88 0.3 undecidable manual P 30 9.5793 128 0.22 72
IV.ESLN.HHZ. 2020-10-20T23:31:43.72 0.1 positive manual P 206 5.3946 144 -0.35 94
IV.EMCN.HHZ. 2020-10-20T23:31:43.99 0.3 undecidable manual P 25 6.6933 138 -0.24 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESLN.HHN. ML:0.0 0.0023316995 0.256 AML other m 2020-10-20T23:31:45.25
IV.ESLN.HHE. ML:0.0 0.0018364780000000001 0.2688 AML other m 2020-10-20T23:31:47.14
IV.EMCN.HHE. ML:2.0 0.0020884465 0.1024 AML other m 2020-10-20T23:31:46.89
IV.EMCN.HNN. ML:2.1 0.0025672295 0.1408 AML other m 2020-10-20T23:31:48.56
IV.EMCN.HHN. ML:2.1 0.0025244065 0.1408 AML other m 2020-10-20T23:31:48.56
IV.EMCN.HNE. ML:2.0 0.00195897565 0.1024 AML other m 2020-10-20T23:31:46.89
IV.EMSG.HHE. ML:1.9 0.001118243 0.2432 AML other m 2020-10-20T23:31:50.42
IV.EMSG.HHN. ML:1.9 0.001293348 0.1792 AML other m 2020-10-20T23:31:51.73
IV.EVRN.HHN. ML:1.8 0.0008389978 0.1792 AML other m 2020-10-20T23:31:50.03
IV.EVRN.HNE. ML:1.9 0.0010972382999999998 0.4224 AML other m 2020-10-20T23:31:49.79
IV.EVRN.HHE. ML:1.8 0.00087649055 0.1408 AML other m 2020-10-20T23:31:49.79
IV.EVRN.HNN. ML:1.8 0.0008867947 0.1792 AML other m 2020-10-20T23:31:50.12
IV.ENIC.HNN. ML:2.2 0.0020413035 0.1152 AML other m 2020-10-20T23:31:50.51
IV.ENIC.HHE. ML:2.0 0.0013699474999999998 0.1152 AML other m 2020-10-20T23:31:47.61
IV.ENIC.HHN. ML:2.2 0.0018733884999999999 0.1024 AML other m 2020-10-20T23:31:50.50
IV.ENIC.HNE. ML:2.1 0.00161653605 0.2048 AML other m 2020-10-20T23:31:50.04
IV.EPZF.HHE. ML:1.7 0.0004932017 0.2816 AML other m 2020-10-20T23:31:53.50
IV.EPZF.HHN. ML:1.8 0.00070515645 0.4224 AML other m 2020-10-20T23:31:50.16
IV.ESML.HHE. ML:1.8 0.0006098023999999999 0.2944 AML other m 2020-10-20T23:31:54.16
IV.ESML.HHN. ML:1.6 0.00036675164999999996 0.5632 AML other m 2020-10-20T23:31:54.62
IV.EPOZ.HHN. ML:1.8 0.0004892137000000001 0.3456 AML other m 2020-10-20T23:31:51.09
IV.EPOZ.HHE. ML:1.9 0.0007047931499999999 0.4224 AML other m 2020-10-20T23:31:51.78
IV.GALF.HHN. ML:2.1 0.00047991569999999994 0.4352 AML other m 2020-10-20T23:32:01.39
IV.GALF.HHE. ML:2.0 0.00041217465 0.3712 AML other m 2020-10-20T23:32:03.23
IV.HAVL.HHN. ML:1.6 0.000054697830000000005 0.128 AML other m 2020-10-20T23:32:10.76
IV.HAVL.HHE. ML:1.5 0.00003889618 0.0896 AML other m 2020-10-20T23:32:09.73
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