Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 31-12-2020 and time 20:51:01 (UTC) in region 4 km N Ragalna (CT)

A magnitude ML 2.0 earthquake occured in region: 4 km N Ragalna (CT), on

  • 31-12-2020 20:51:01 (UTC)
  • 31-12-2020 21:51:01 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.6670, 14.9260 at 16 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
Ragalna CT 4 3924 3924
Biancavilla CT 6 24007 27931
Santa Maria di Licodia CT 7 7641 35572
Adrano CT 8 36122 71694
Belpasso CT 10 28108 99802
Paternò CT 10 48228 148030
Nicolosi CT 11 7463 155493
Pedara CT 13 14102 169595
Camporotondo Etneo CT 13 5023 174618
San Pietro Clarenza CT 14 7743 182361
Trecastagni CT 15 10910 193271
Mascalucia CT 15 31958 225229
Bronte CT 16 19172 244401
Zafferana Etnea CT 16 9517 253918
Viagrande CT 16 8563 262481
Tremestieri Etneo CT 16 20589 283070
Gravina di Catania CT 17 25838 308908
Centuripe EN 17 5470 314378
Motta Sant'Anastasia CT 18 12116 326494
Misterbianco CT 18 49410 375904
Aci Bonaccorsi CT 18 3524 379428
Milo CT 18 1087 380515
San Giovanni la Punta CT 18 23060 403575
Sant'Agata li Battiati CT 18 9479 413054
Santa Venerina CT 19 8592 421646
Maletto CT 19 3920 425566
Aci Sant'Antonio CT 19 17984 443550
San Gregorio di Catania CT 20 11966 455516

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km W of Acireale (52622 inhabitants)
23 Km NW of Catania (314555 inhabitants)
75 Km NW of Siracusa (122291 inhabitants)
79 Km E of Caltanissetta (63360 inhabitants)
80 Km SW of Reggio di Calabria (183035 inhabitants)
81 Km SW of Messina (238439 inhabitants)
84 Km N of Ragusa (73313 inhabitants)
87 Km NE of Vittoria (63339 inhabitants)
90 Km NE of Gela (75827 inhabitants)
91 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 2.0 2020-12-31
20:51:01		 37.6672 14.926 16 2021-02-26
14:56:20		 Bollettino Sismico Italiano INGV 87500401
Reviewed
Rev200 		ML 1.8 2020-12-31
20:51:00		 37.665 14.962 14 2021-02-26
10:41:19		 Sala Operativa INGV_OE (Catania) 85924111
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-31 20:51:01 ± 0.13
Latitude 37.6672 ± 0.0063
Longitude 14.9260 ± 0.0091
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87500401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 870
Semi-minor axis of confidence ellipse (meter) 239
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 110
Circular confidence region, given by single value of horizontal uncertainty (meter) 870.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 54
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.02158
Epicentral distance of station farthest from the epicenter (degree) 0.72395
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 85924111
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2020-12-31 23:08:35

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 87500401
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-26 10:40:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAVL.HHZ. 2020-12-31T20:51:25.90 0.6 undecidable manual S 168 80.364 94 0.58 40
IV.SSY.HHZ. 2020-12-31T20:51:20.02 0.3 undecidable manual S 167 57.9975 96 0.67 61
IV.HCRL.HHZ. 2020-12-31T20:51:15.79 0.6 undecidable manual S 168 43.623 98 0.24 47
IV.AIO.HHE. 2020-12-31T20:51:15.49 0.6 undecidable manual S 38 43.1235 98 0.06 49
IV.HAVL.HHZ. 2020-12-31T20:51:14.71 0.1 undecidable manual P 168 80.364 94 -0.48 83
IV.RAFF.HHZ. 2020-12-31T20:51:13.78 0.3 undecidable manual P 225 69.9744 94 0.19 68
IV.HLNI.HHZ. 2020-12-31T20:51:13.71 0.6 undecidable manual S 188 35.6421 101 0.26 48
IV.ECTS.HHZ. 2020-12-31T20:51:12.20 0.6 undecidable manual S 36 29.3484 105 0.39 47
IV.EPOZ.HHZ. 2020-12-31T20:51:11.03 0.6 undecidable manual S 89 23.0547 111 0.82 40
IV.SSY.HHZ. 2020-12-31T20:51:11.58 0.1 undecidable manual P 167 57.9975 96 -0.18 93
IV.EVRN.HHZ. 2020-12-31T20:51:09.01 0.6 undecidable manual S 82 18.5703 118 -0.11 51
IV.HCRL.HHZ. 2020-12-31T20:51:09.08 0.3 undecidable manual P 168 43.623 98 -0.48 67
IV.AIO.HHE. 2020-12-31T20:51:09.12 0.3 undecidable manual P 38 43.1235 98 -0.37 69
IV.MUCR.HHE. 2020-12-31T20:51:09.36 0.6 undecidable manual P 354 41.9247 99 0.06 49
IV.GALF.HHZ. 2020-12-31T20:51:08.59 0.1 undecidable manual P 279 31.9458 103 0.81 81
IV.ECTS.HHZ. 2020-12-31T20:51:07.06 0.3 undecidable manual P 36 29.3484 105 -0.33 71
IV.ENIC.HHZ. 2020-12-31T20:51:07.23 0.6 undecidable manual S 115 9.2796 142 0.02 52
IV.ESML.HHZ. 2020-12-31T20:51:07.08 0.6 undecidable manual S 217 6.7932 151 0.24 50
IV.HLNI.HHZ. 2020-12-31T20:51:07.89 0.3 undecidable manual P 188 35.6421 101 -0.46 68
IV.ECHR.HHE. 2020-12-31T20:51:07.22 0.6 undecidable manual S 332 2.3976 169 0.77 43
IV.EVRN.HHZ. 2020-12-31T20:51:06.56 0.3 undecidable manual P 82 18.5703 118 0.72 64
IV.EPOZ.HHZ. 2020-12-31T20:51:06.40 0.6 undecidable manual P 89 23.0547 111 -0.07 51
IV.ESLN.HHZ. 2020-12-31T20:51:06.63 0.6 undecidable manual S 55 5.1948 158 -0.02 53
IV.EMSG.HHN. 2020-12-31T20:51:05.65 0.3 undecidable manual P 7 17.1717 121 -0.01 78
IV.EPZF.HHZ. 2020-12-31T20:51:05.82 0.3 undecidable manual P 341 18.4704 118 0 77
IV.ECBD.HHN. 2020-12-31T20:51:05.72 0.3 undecidable manual P 48 18.87 117 -0.16 75
IV.ESML.HHZ. 2020-12-31T20:51:04.12 0.1 undecidable manual P 217 6.7932 151 -0.41 97
IV.ESLN.HHZ. 2020-12-31T20:51:04.08 0.3 undecidable manual P 55 5.1948 158 -0.34 74
IV.ENIC.HHZ. 2020-12-31T20:51:04.49 0.1 undecidable manual P 115 9.2796 142 -0.25 100
IV.ECHR.HHE. 2020-12-31T20:51:03.80 0.3 undecidable manual P 332 2.3976 169 -0.5 71
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESML.HHN. ML:1.7 0.0005420000000000001 0.72 AML other m 2020-12-31T20:51:07.30
IV.ENIC.HHE. ML:2.3 0.00183 0.14 AML other m 2020-12-31T20:51:09.61
IV.ENIC.HHN. ML:2.2 0.001425 1.28 AML other m 2020-12-31T20:51:09.22
IV.ESML.HHE. ML:1.7 0.00054 1.06 AML other m 2020-12-31T20:51:09.91
IV.EVRN.HHN. ML:2.0 0.0006045 1.38 AML other m 2020-12-31T20:51:12.70
IV.EVRN.HHE. ML:1.9 0.0005909999999999999 0.44 AML other m 2020-12-31T20:51:12.39
IV.HLNI.HHE. ML:1.6 0.000167 0.18 AML other m 2020-12-31T20:51:14.54
IV.HLNI.HHN. ML:1.5 0.0001285 0.48 AML other m 2020-12-31T20:51:15.09
IV.HCRL.HHE. ML:1.8 0.00019700000000000002 1.24 AML other m 2020-12-31T20:51:17.04
IV.HCRL.HHN. ML:1.8 0.00016845 1.3 AML other m 2020-12-31T20:51:17.79
IV.GALF.HHE. ML:1.9 0.0003135 0.58 AML other m 2020-12-31T20:51:18.38
IV.GALF.HHN. ML:1.9 0.00033350000000000003 0.44 AML other m 2020-12-31T20:51:18.77
IV.SSY.HHE. ML:2.4 0.0005565 0.34 AML other m 2020-12-31T20:51:20.32
IV.SSY.HHN. ML:2.7 0.0009730000000000001 0.44 AML other m 2020-12-31T20:51:23.25
IV.HAVL.HHE. ML:2.2 0.00023999999999999998 0.32 AML other m 2020-12-31T20:51:26.66
IV.HAVL.HHN. ML:2.3 0.0002965 0.62 AML other m 2020-12-31T20:51:26.66
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