Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 23-11-2020 and time 21:34:52 (Italy) in region 1 km S Otricoli (TR)

A magnitude ML 1.4 earthquake occured in region: 1 km S Otricoli (TR), on

  • 23-11-2020 20:34:52 (UTC)
  • 23-11-2020 21:34:52 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.4140, 12.4810 at 6 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
Calvi dell'Umbria TR 7 1856 7499
Gallese VT 8 2849 10348
Orte VT 9 8923 19271
Collevecchio RI 11 1577 20848
Montebuono RI 11 883 21731
Vasanello VT 11 4068 25799
Tarano RI 11 1444 27243
Narni TR 12 19785 47028
Corchiano VT 13 3869 50897
Vacone RI 13 256 51153
Configni RI 13 633 51786
Penna in Teverina TR 14 1099 52885
Stimigliano RI 15 2328 55213
Torri in Sabina RI 15 1256 56469
Civita Castellana VT 15 16491 72960
Bassano in Teverina VT 15 1313 74273
Selci RI 16 1106 75379
Forano RI 16 3179 78558
Giove TR 17 1928 80486
Montasola RI 17 395 80881
Vignanello VT 17 4652 85533
Cottanello RI 17 563 86096
Amelia TR 17 11897 97993
Fabrica di Roma VT 18 8340 106333
Casperia RI 18 1246 107579
Stroncone TR 18 4917 112496
Vallerano VT 18 2621 115117
Cantalupo in Sabina RI 18 1685 116802
Ponzano Romano RM 19 1155 117957
Attigliano TR 19 2028 119985
Carbognano VT 20 1995 121980
Filacciano RM 20 477 122457

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km SW of Terni (111501 inhabitants)
31 Km E of Viterbo (67173 inhabitants)
50 Km NW of Guidonia Montecelio (88673 inhabitants)
56 Km NW of Tivoli (56533 inhabitants)
58 Km N of Roma (2864731 inhabitants)
63 Km S of Foligno (57155 inhabitants)
67 Km NE of Civitavecchia (52991 inhabitants)
74 Km N of Fiumicino (78395 inhabitants)
76 Km W of L'Aquila (69753 inhabitants)
78 Km S of Perugia (166134 inhabitants)
83 Km N of Pomezia (62966 inhabitants)
84 Km N 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 1.4 2020-11-23
20:34:52		 42.4138 12.4808 6 2021-02-26
14:56:17		 Bollettino Sismico Italiano INGV 86747021
Reviewed
Rev100 		ML 1.4 2020-11-23
20:34:52		 42.4143 12.4893 8 2020-11-23
20:44:57		 Sala Sismica INGV-Roma 84969541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-11-23 20:34:52 ± 0.1
Latitude 42.4138 ± 0.0063
Longitude 12.4808 ± 0.0073
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86747021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 579
Semi-minor axis of confidence ellipse (meter) 497
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 154
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.17807
Epicentral distance of station farthest from the epicenter (degree) 0.78871
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 86747021
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-01 00:33:09

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 84969541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-11-23 20:44:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2020-11-23T20:35:19.07 0.6 undecidable manual S 35 84.9483 50 0.53 44
IV.MMO1.EHZ. 2020-11-23T20:35:19.93 0.6 undecidable manual S 52 87.5457 50 0.69 41
IV.MCIV.CHZ. 2020-11-23T20:35:16.49 0.6 undecidable manual S 302 77.1672 50 0.03 50
IV.SACS.HHZ. 2020-11-23T20:35:14.34 0.6 undecidable manual S 316 67.0773 50 0.56 45
IV.NRCA.HHZ. 2020-11-23T20:35:14.63 0.6 undecidable manual S 48 69.5748 50 0.19 49
IV.MGAB.HHZ. 2020-11-23T20:35:12.60 0.6 undecidable manual S 332 62.9925 50 -0.08 51
IV.LNSS.HHZ. 2020-11-23T20:35:08.90 0.6 undecidable manual S 65 50.3163 50 -0.41 49
IV.FDMO.HHZ. 2020-11-23T20:35:07.33 0.3 undecidable manual P 35 84.9483 50 -0.1 73
IV.MOMA.HHZ. 2020-11-23T20:35:07.52 0.6 undecidable manual S 10 43.9227 50 -0.06 53
IV.MMO1.EHZ. 2020-11-23T20:35:07.48 0.6 undecidable manual P 52 87.5457 50 -0.36 46
IV.MCIV.CHZ. 2020-11-23T20:35:06.88 0.6 undecidable manual P 302 77.1672 50 0.65 43
IV.BARO.EHN. 2020-11-23T20:35:05.74 0.3 undecidable manual S 243 39.7269 98 -0.44 74
IV.NRCA.HHZ. 2020-11-23T20:35:04.74 0.3 undecidable manual P 48 69.5748 50 -0.32 72
IV.SACS.HHZ. 2020-11-23T20:35:04.96 0.3 undecidable manual P 316 67.0773 50 0.28 73
IV.MGAB.HHZ. 2020-11-23T20:35:04.24 0.1 undecidable manual P 332 62.9925 50 0.2 100
IV.ARRO.EHZ. 2020-11-23T20:35:02.86 0.6 undecidable manual S 52 29.6481 101 0.12 54
IV.LNSS.HHZ. 2020-11-23T20:35:01.61 0.1 undecidable manual P 65 50.3163 50 -0.49 96
IV.CESX.HHZ. 2020-11-23T20:35:00.55 0.3 undecidable manual S 22 23.2545 104 -0.03 83
IV.MOMA.HHZ. 2020-11-23T20:35:00.51 0.1 undecidable manual P 10 43.9227 50 -0.6 94
IV.BARO.EHN. 2020-11-23T20:35:00.04 0.3 undecidable manual P 243 39.7269 98 -0.26 77
IV.SRES.HHE. 2020-11-23T20:34:59.76 0.6 undecidable manual S 173 19.7691 106 0.36 52
IV.ARRO.EHZ. 2020-11-23T20:34:58.43 0.3 undecidable manual P 52 29.6481 101 0.12 81
IV.CESX.HHZ. 2020-11-23T20:34:57.16 0.3 undecidable manual P 22 23.2545 104 0.1 82
IV.SRES.HHE. 2020-11-23T20:34:56.87 0.3 undecidable manual P 173 19.7691 106 0.49 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHE. ML:1.2 0.00009955 1.12 AML other m 2020-11-23T20:35:05.84
IV.CESX.HHN. ML:1.3 0.00014299999999999998 0.52 AML other m 2020-11-23T20:35:05.68
IV.ARRO.EHN. ML:1.3 0.00010499999999999999 1.06 AML other m 2020-11-23T20:35:05.28
IV.MOMA.HHE. ML:1.6 0.0001175 0.82 AML other m 2020-11-23T20:35:09.56
IV.ARRO.EHE. ML:1.3 0.00009345000000000001 0.84 AML other m 2020-11-23T20:35:09.41
IV.MOMA.HHN. ML:1.3 0.0000669 0.28 AML other m 2020-11-23T20:35:09.54
IV.MGAB.HHN. ML:1.5 0.000062 0.26 AML other m 2020-11-23T20:35:13.74
IV.MGAB.HHE. ML:1.6 0.00007245 0.16 AML other m 2020-11-23T20:35:14.73
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