Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 24-12-2020 and time 19:27:21 (UTC) in region 1 km SW Otricoli (TR)

A magnitude ML 1.6 earthquake occured in region: 1 km SW Otricoli (TR), on

  • 24-12-2020 19:27:21 (UTC)
  • 24-12-2020 20:27:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.4160, 12.4700 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
Otricoli TR 1 1869 1869
Magliano Sabina RI 6 3774 5643
Gallese VT 7 2849 8492
Calvi dell'Umbria TR 8 1856 10348
Orte VT 9 8923 19271
Vasanello VT 10 4068 23339
Collevecchio RI 11 1577 24916
Montebuono RI 12 883 25799
Corchiano VT 12 3869 29668
Narni TR 12 19785 49453
Tarano RI 12 1444 50897
Penna in Teverina TR 13 1099 51996
Vacone RI 14 256 52252
Configni RI 14 633 52885
Bassano in Teverina VT 14 1313 54198
Civita Castellana VT 15 16491 70689
Stimigliano RI 15 2328 73017
Torri in Sabina RI 16 1256 74273
Giove TR 16 1928 76201
Vignanello VT 16 4652 80853
Selci RI 16 1106 81959
Forano RI 17 3179 85138
Amelia TR 17 11897 97035
Fabrica di Roma VT 17 8340 105375
Vallerano VT 17 2621 107996
Montasola RI 18 395 108391
Cottanello RI 18 563 108954
Stroncone TR 18 4917 113871
Attigliano TR 19 2028 115899
Casperia RI 19 1246 117145
Cantalupo in Sabina RI 19 1685 118830
Carbognano VT 19 1995 120825
Soriano nel Cimino VT 19 8403 129228
Ponzano Romano RM 19 1155 130383
Canepina VT 20 3082 133465
Bomarzo VT 20 1805 135270

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SW of Terni (111501 inhabitants)
30 Km E of Viterbo (67173 inhabitants)
51 Km NW of Guidonia Montecelio (88673 inhabitants)
57 Km NW of Tivoli (56533 inhabitants)
58 Km N of Roma (2864731 inhabitants)
63 Km SW of Foligno (57155 inhabitants)
66 Km NE of Civitavecchia (52991 inhabitants)
74 Km N of Fiumicino (78395 inhabitants)
77 Km W of L'Aquila (69753 inhabitants)
77 Km S of Perugia (166134 inhabitants)
83 Km N of Pomezia (62966 inhabitants)
85 Km NW of Velletri (53303 inhabitants)
92 Km N of Aprilia (73446 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 1.6 2020-12-24
19:27:21		 42.4157 12.4703 8 2021-02-26
14:56:14		 Bollettino Sismico Italiano INGV 86098111
Reviewed
Rev100 		ML 1.6 2020-12-24
19:27:21		 42.4128 12.466 8 2020-12-24
19:34:15		 Sala Sismica INGV-Roma 85686721
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-24 19:27:21 ± 0.11
Latitude 42.4157 ± 0.0045
Longitude 12.4703 ± 0.0085
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 86098111

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 572
Semi-minor axis of confidence ellipse (meter) 410
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 112
Circular confidence region, given by single value of horizontal uncertainty (meter) 570.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
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) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.18076
Epicentral distance of station farthest from the epicenter (degree) 0.76802
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 86098111
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-08 15:30:13

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 85686721
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-24 19:34:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2020-12-24T19:27:47.80 0.6 undecidable manual S 36 85.248 50 0.69 38
IV.CESI.HHN. 2020-12-24T19:27:44.64 0.6 undecidable manual S 28 74.37 50 0.45 42
IV.ASSB.HHE. 2020-12-24T19:27:43.61 0.6 undecidable manual S 12 71.1732 50 0.25 44
IV.NRCA.HHZ. 2020-12-24T19:27:43.17 0.6 undecidable manual S 48 70.0743 50 0.12 45
IV.MGAB.HNE. 2020-12-24T19:27:41.45 0.6 undecidable manual S 332 62.3931 50 0.45 43
IV.TOLF.HHN. 2020-12-24T19:27:39.27 0.6 undecidable manual S 225 54.9006 50 0.27 45
IV.LNSS.HHZ. 2020-12-24T19:27:37.77 0.6 undecidable manual S 66 51.0156 50 -0.2 46
IV.MTCE.HHZ. 2020-12-24T19:27:37.74 0.6 undecidable manual S 153 49.0176 50 0.32 45
IV.GAVE.HNZ. 2020-12-24T19:27:36.88 0.6 undecidable manual S 48 46.2204 50 0.18 47
IV.FDMO.HHZ. 2020-12-24T19:27:36.08 0.1 undecidable manual P 36 85.248 50 -0.05 89
IV.MOMA.HHN. 2020-12-24T19:27:35.78 0.6 undecidable manual S 11 43.8228 50 -0.27 46
IV.ASSB.HHE. 2020-12-24T19:27:34.02 0.3 undecidable manual P 12 71.1732 50 0.06 69
IV.CESI.HHN. 2020-12-24T19:27:34.18 0.3 undecidable manual P 28 74.37 50 -0.27 65
IV.NRCA.HHZ. 2020-12-24T19:27:33.46 0.3 undecidable manual P 48 70.0743 50 -0.33 65
IV.SACS.HNE. 2020-12-24T19:27:33.76 0.3 undecidable manual P 317 66.378 50 0.54 62
IV.ARRO.EHZ. 2020-12-24T19:27:32.85 0.3 undecidable manual S 53 30.2475 104 0.91 57
IV.MGAB.HNE. 2020-12-24T19:27:32.32 0.3 undecidable manual P 332 62.3931 50 -0.29 66
IT.MMP1.HGE. 2020-12-24T19:27:31.97 0.6 undecidable manual S 129 29.3484 105 0.32 47
IV.FIAM.HNN. 2020-12-24T19:27:31.14 0.3 undecidable manual P 107 55.5 50 -0.41 66
IV.TOLF.HHN. 2020-12-24T19:27:31.37 0.1 undecidable manual P 225 54.9006 50 -0.08 94
IV.LNSS.HHZ. 2020-12-24T19:27:30.40 0.1 undecidable manual P 66 51.0156 50 -0.46 87
IV.MTCE.HHZ. 2020-12-24T19:27:30.31 0.3 undecidable manual P 153 49.0176 50 -0.22 69
IV.GAVE.HNZ. 2020-12-24T19:27:30.03 0.3 undecidable manual P 48 46.2204 50 -0.09 71
IV.MOMA.HHN. 2020-12-24T19:27:29.39 0.3 undecidable manual P 11 43.8228 50 -0.35 68
IV.CESX.HHZ. 2020-12-24T19:27:29.03 0.6 undecidable manual S 24 23.4543 108 -0.65 43
IV.SRES.HHZ. 2020-12-24T19:27:28.26 0.6 undecidable manual S 171 20.0688 111 -0.33 47
IV.ARRO.EHZ. 2020-12-24T19:27:27.27 0.3 undecidable manual P 53 30.2475 104 -0.1 73
IT.MMP1.HGE. 2020-12-24T19:27:27.23 0.3 undecidable manual P 129 29.3484 105 0.02 75
IV.CESX.HHZ. 2020-12-24T19:27:26.02 0.1 undecidable manual P 24 23.4543 108 -0.04 100
IV.SRES.HHZ. 2020-12-24T19:27:25.80 0.1 undecidable manual P 171 20.0688 111 0.36 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHN. ML:1.4 0.0001265 1.08 AML other m 2020-12-24T19:27:33.74
IV.ARRO.EHE. ML:1.3 0.00009305 0.6 AML other m 2020-12-24T19:27:34.70
IV.LNSS.HHE. ML:1.8 0.0001505 0.3 AML other m 2020-12-24T19:27:39.29
IV.LNSS.HHN. ML:1.7 0.0001285 0.34 AML other m 2020-12-24T19:27:40.27
IV.NRCA.HHN. ML:1.7 0.00008895000000000001 0.12 AML other m 2020-12-24T19:27:44.37
IV.NRCA.HHE. ML:1.8 0.00011325 0.9 AML other m 2020-12-24T19:27:44.45
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