Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 31-12-2020 and time 21:59:49 (UTC) in region 5 km N Ragalna (CT)

A magnitude ML 1.8 earthquake occured in region: 5 km N Ragalna (CT), on

  • 31-12-2020 21:59:49 (UTC)
  • 31-12-2020 22:59:49 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.6700, 14.9240 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 5 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
Bronte CT 15 19172 212443
Mascalucia CT 16 31958 244401
Zafferana Etnea CT 16 9517 253918
Viagrande CT 17 8563 262481
Tremestieri Etneo CT 17 20589 283070
Centuripe EN 17 5470 288540
Gravina di Catania CT 17 25838 314378
Motta Sant'Anastasia CT 18 12116 326494
Milo CT 18 1087 327581
Misterbianco CT 18 49410 376991
Aci Bonaccorsi CT 18 3524 380515
San Giovanni la Punta CT 18 23060 403575
Sant'Agata li Battiati CT 19 9479 413054
Maletto CT 19 3920 416974
Santa Venerina CT 19 8592 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)
85 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 1.8 2020-12-31
21:59:49		 37.6702 14.9245 16 2021-02-26
14:56:20		 Bollettino Sismico Italiano INGV 87503641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-31 21:59:49 ± 0.1
Latitude 37.6702 ± 0.0054
Longitude 14.9245 ± 0.0125
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 87503641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1062
Semi-minor axis of confidence ellipse (meter) 422
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 290
Circular confidence region, given by single value of horizontal uncertainty (meter) 1060.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.01889
Epicentral distance of station farthest from the epicenter (degree) 0.72755
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 87503641
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-26 11:52:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAVL.HHZ. 2020-12-31T22:00:14.19 0.6 undecidable manual S 167 80.7636 94 0.49 53
IV.SSY.HHZ. 2020-12-31T22:00:08.42 0.6 undecidable manual S 167 58.2972 96 0.68 51
IV.AIO.HHE. 2020-12-31T22:00:04.04 0.6 undecidable manual S 39 42.9237 99 0.36 57
IV.HCRL.HHZ. 2020-12-31T22:00:04.21 0.6 undecidable manual S 167 43.9227 98 0.27 59
IV.HAVL.HHZ. 2020-12-31T22:00:03.19 0.3 undecidable manual P 167 80.7636 94 -0.35 81
IV.HLNI.HHZ. 2020-12-31T22:00:02.11 0.6 undecidable manual S 187 35.9418 101 0.27 60
IV.SSY.HHZ. 2020-12-31T22:00:00.00 0.3 undecidable manual P 167 58.2972 96 -0.1 89
IV.ECTS.HHZ. 2020-12-31T22:00:00.34 0.6 undecidable manual S 36 29.1486 105 0.28 60
IV.MUCR.HHE. 2020-12-31T21:59:57.99 0.3 undecidable manual P 354 41.625 99 0.45 86
IV.AIO.HHE. 2020-12-31T21:59:57.54 0.3 undecidable manual P 39 42.9237 99 -0.21 91
IV.HCRL.HHZ. 2020-12-31T21:59:57.52 0.3 undecidable manual P 167 43.9227 98 -0.38 86
IV.HLNI.HHZ. 2020-12-31T21:59:56.35 0.3 undecidable manual P 187 35.9418 101 -0.34 88
IV.ENIC.HHZ. 2020-12-31T21:59:56.00 0.6 undecidable manual S 117 9.5793 142 0.43 61
IV.ECTS.HHZ. 2020-12-31T21:59:55.21 0.3 undecidable manual P 36 29.1486 105 -0.45 88
IV.ESLN.HHZ. 2020-12-31T21:59:54.82 0.6 undecidable manual S 59 5.0949 158 -0.16 65
IV.ECBD.HHN. 2020-12-31T21:59:54.00 0.3 undecidable manual P 49 18.7701 118 -0.17 95
IV.EPZF.HHZ. 2020-12-31T21:59:54.41 0.3 undecidable manual P 341 18.0708 120 0.33 92
IV.EPIT.HHN. 2020-12-31T21:59:54.18 0.6 undecidable manual P 36 19.4694 117 -0.09 64
IV.EPOZ.HHZ. 2020-12-31T21:59:54.32 0.6 undecidable manual P 89 23.1546 111 -0.47 59
IV.EMSG.HHZ. 2020-12-31T21:59:54.04 0.3 undecidable manual P 8 16.872 122 0.12 96
IV.ENIC.HHZ. 2020-12-31T21:59:53.28 0.3 undecidable manual P 117 9.5793 142 0.21 95
IV.EMCN.HHN. 2020-12-31T21:59:53.67 0.3 undecidable manual P 35 16.4724 123 -0.2 95
IV.ECHR.HHE. 2020-12-31T21:59:52.67 0.3 undecidable manual P 330 2.0979 171 0.06 100
IV.ESLN.HHZ. 2020-12-31T21:59:52.71 0.3 undecidable manual P 59 5.0949 158 -0.02 100
IV.ESML.HHZ. 2020-12-31T21:59:52.65 0.3 undecidable manual P 215 6.993 151 -0.21 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ENIC.HHE. ML:1.8 0.000582 0.7 AML other m 2020-12-31T21:59:57.95
IV.ENIC.HHN. ML:1.8 0.000621 0.9 AML other m 2020-12-31T21:59:58.09
IV.HLNI.HHE. ML:1.5 0.00010315 1.32 AML other m 2020-12-31T22:00:02.97
IV.HLNI.HHN. ML:1.3 0.00007775 1.04 AML other m 2020-12-31T22:00:03.78
IV.SSY.HHE. ML:2.2 0.00029499999999999996 0.76 AML other m 2020-12-31T22:00:11.34
IV.SSY.HHN. ML:2.5 0.000621 0.26 AML other m 2020-12-31T22:00:11.98
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