Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 03-12-2020 and time 22:00:37 (UTC) in region 4 km E Norcia (PG)

A magnitude ML 1.8 earthquake occured in region: 4 km E Norcia (PG), on

  • 03-12-2020 22:00:37 (UTC)
  • 03-12-2020 23:00:37 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8060, 13.1360 at 10 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
Norcia PG 4 4957 4957
Castelsantangelo sul Nera MC 10 281 5238
Preci PG 11 724 5962
Arquata del Tronto AP 14 1178 7140
Cascia PG 14 3217 10357
Visso MC 15 1107 11464
Accumoli RI 15 667 12131
Ussita MC 16 444 12575
Montegallo AP 17 523 13098
Cerreto di Spoleto PG 18 1075 14173
Montemonaco AP 19 604 14777
Sellano PG 19 1079 15856
Poggiodomo PG 19 117 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
69 Km E of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km W of Pescara (121014 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
99 Km NW of Chieti (51815 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 2020-12-03
22:00:37		 42.8058 13.1357 10 2021-02-26
14:56:09		 Bollettino Sismico Italiano INGV 85194911
Reviewed
Rev100 		ML 1.8 2020-12-03
22:00:37		 42.8035 13.1347 10 2020-12-03
22:50:13		 Sala Sismica INGV-Roma 85184141
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-03 22:00:37 ± 0.05
Latitude 42.8058 ± 0.0027
Longitude 13.1357 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 85194911

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 349
Semi-minor axis of confidence ellipse (meter) 219
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 78
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
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 57
Number of defining phases 57
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.03148
Epicentral distance of station farthest from the epicenter (degree) 0.70597
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 30
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 29
Type of magnitude ML
Reference to an origin 85194911
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-28 11:21:27

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 32
Type of magnitude ML
Reference to an origin 85184141
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-03 22:50:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2020-12-03T22:01:01.95 0.6 undecidable manual S 349 78.366 50 0.73 36
IV.EL6.EHZ. 2020-12-03T22:00:56.16 0.6 undecidable manual S 357 58.0974 50 0.34 43
IV.SNTG.HHZ. 2020-12-03T22:00:54.31 0.6 undecidable manual S 342 52.3032 50 0.06 46
IV.CESX.HHE. 2020-12-03T22:00:53.97 0.6 undecidable manual S 244 49.8168 50 0.37 43
IV.ASSB.HHZ. 2020-12-03T22:00:53.01 0.6 undecidable manual S 304 46.8198 50 0.22 45
IV.MOMA.HHZ. 2020-12-03T22:00:53.14 0.6 undecidable manual S 270 46.0206 50 0.55 41
IV.ARVD.HHZ. 2020-12-03T22:00:51.04 0.3 undecidable manual P 349 78.366 50 -0.16 64
IV.MDAR.HNN. 2020-12-03T22:00:51.62 0.3 undecidable manual S 1 42.9237 50 -0.14 69
IV.TERO.HHZ. 2020-12-03T22:00:51.29 0.3 undecidable manual S 118 43.2234 50 -0.56 62
IV.SAP2.EHZ. 2020-12-03T22:00:51.43 0.3 undecidable manual S 33 38.7279 50 0.8 57
IV.ARRO.EHZ. 2020-12-03T22:00:50.35 0.6 undecidable manual S 230 39.2274 50 -0.43 43
IV.SSFR.HHZ. 2020-12-03T22:00:50.89 0.3 undecidable manual P 338 75.5688 50 0.12 65
IV.MML1.HNE. 2020-12-03T22:00:49.82 0.3 undecidable manual S 339 36.6411 50 -0.26 68
IV.PF6.EHN. 2020-12-03T22:00:49.85 0.1 undecidable manual S 7 37.1295 50 -0.36 88
IV.MF5.EHN. 2020-12-03T22:00:49.60 0.6 undecidable manual S 52 33.1446 50 0.44 44
IV.GUMA.HHZ. 2020-12-03T22:00:49.33 0.1 undecidable manual S 30 32.745 50 0.28 91
IV.CAMP.HHZ. 2020-12-03T22:00:49.81 0.6 undecidable manual S 143 37.3293 50 -0.46 43
IV.CSP1.EHZ. 2020-12-03T22:00:48.60 0.1 undecidable manual S 10 32.2455 50 -0.3 90
IV.MNTT.EHZ. 2020-12-03T22:00:47.07 0.1 undecidable manual P 53 46.9197 50 0.71 77
IV.OFFI.HHZ. 2020-12-03T22:00:47.12 0.3 undecidable manual P 72 46.9197 50 0.75 57
IV.SNTG.HHZ. 2020-12-03T22:00:47.00 0.1 undecidable manual P 342 52.3032 50 -0.18 89
IV.EL6.EHZ. 2020-12-03T22:00:47.95 0.1 undecidable manual P 357 58.0974 50 -0.13 89
IV.CESI.HHZ. 2020-12-03T22:00:47.75 0.1 undecidable manual S 320 28.9488 50 -0.29 91
IV.LNSS.HHZ. 2020-12-03T22:00:46.39 0.6 undecidable manual S 199 23.8539 112 -0.04 48
IV.ASSB.HHZ. 2020-12-03T22:00:46.47 0.3 undecidable manual P 304 46.8198 50 0.13 68
IV.MOMA.HHZ. 2020-12-03T22:00:46.73 0.1 undecidable manual P 270 46.0206 50 0.51 84
IV.CESX.HHE. 2020-12-03T22:00:46.98 0.3 undecidable manual P 244 49.8168 50 0.18 67
IV.SMA1.EHZ. 2020-12-03T22:00:46.77 0.6 undecidable manual S 140 25.3524 111 -0.15 47
IV.T1299.HNZ. 2020-12-03T22:00:46.24 0.6 undecidable manual S 148 22.4553 113 0.24 46
IV.FDMO.HHZ. 2020-12-03T22:00:46.61 0.6 undecidable manual S 351 25.8519 110 -0.48 44
IV.MTRA.EHZ. 2020-12-03T22:00:45.46 0.6 undecidable manual S 104 21.9669 114 -0.36 45
IV.ARRO.EHZ. 2020-12-03T22:00:45.11 0.3 undecidable manual P 230 39.2274 50 -0.07 70
IT.MTCL.HGZ. 2020-12-03T22:00:45.92 0.6 undecidable manual S 332 23.5542 112 -0.44 44
IV.MDAR.HNN. 2020-12-03T22:00:45.39 0.3 undecidable manual P 1 42.9237 50 -0.35 66
IV.SAP2.EHZ. 2020-12-03T22:00:45.28 0.1 undecidable manual P 33 38.7279 50 0.19 91
IV.TERO.HHZ. 2020-12-03T22:00:45.59 0.1 undecidable manual P 118 43.2234 50 -0.19 90
IV.GUMA.HHZ. 2020-12-03T22:00:44.24 0.1 positive manual P 30 32.745 50 0.07 95
IV.FEMA.HNZ. 2020-12-03T22:00:44.71 0.6 undecidable manual S 338 18.6702 117 -0.09 48
IV.CAMP.HHZ. 2020-12-03T22:00:44.58 0.1 positive manual P 143 37.3293 50 -0.3 89
IV.PF6.EHN. 2020-12-03T22:00:44.57 0.1 negative manual P 7 37.1295 50 -0.28 90
IV.MF5.EHN. 2020-12-03T22:00:44.43 0.1 undecidable manual P 52 33.1446 50 0.19 92
IV.MML1.HNE. 2020-12-03T22:00:44.51 0.1 undecidable manual P 339 36.6411 50 -0.26 90
IV.MMO1.EHZ. 2020-12-03T22:00:44.56 0.1 undecidable manual S 56 18.6702 117 -0.24 93
IV.CSP1.EHZ. 2020-12-03T22:00:43.84 0.1 positive manual P 10 32.2455 50 -0.25 91
IV.CESI.HHZ. 2020-12-03T22:00:43.45 0.1 positive manual P 320 28.9488 50 -0.14 94
IV.MC2.EHZ. 2020-12-03T22:00:43.32 0.1 undecidable manual S 20 12.4764 128 0.34 92
IV.LNSS.HHZ. 2020-12-03T22:00:42.74 0.1 positive manual P 199 23.8539 112 0.08 96
IV.T1299.HNZ. 2020-12-03T22:00:42.61 0.1 positive manual P 148 22.4553 113 0.2 94
IV.SMA1.EHZ. 2020-12-03T22:00:42.87 0.1 undecidable manual P 140 25.3524 111 -0.08 95
IV.MTRA.EHZ. 2020-12-03T22:00:42.27 0.1 undecidable manual P 104 21.9669 114 -0.04 97
IV.FDMO.HHZ. 2020-12-03T22:00:42.84 0.1 positive manual P 351 25.8519 110 -0.2 93
IT.MTCL.HGZ. 2020-12-03T22:00:42.49 0.1 undecidable manual P 332 23.5542 112 -0.13 95
IV.NRCA.HNZ. 2020-12-03T22:00:41.02 0.1 undecidable manual S 331 3.4965 160 -0.04 100
IV.FEMA.HNZ. 2020-12-03T22:00:41.83 0.1 undecidable manual P 338 18.6702 117 0.11 96
IV.MMO1.EHZ. 2020-12-03T22:00:41.67 0.1 undecidable manual P 56 18.6702 117 -0.05 97
IV.MC2.EHZ. 2020-12-03T22:00:40.95 0.1 positive manual P 20 12.4764 128 0.28 94
IV.NRCA.HNZ. 2020-12-03T22:00:39.83 0.1 undecidable manual P 331 3.4965 160 0.26 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:2.6 0.008275000000000001 0.12 AML other m 2020-12-03T22:00:41.22
IV.NRCA.HNN. ML:2.6 0.007600000000000001 0.12 AML other m 2020-12-03T22:00:41.22
IV.NRCA.HNE. ML:2.3 0.003885 0.16 AML other m 2020-12-03T22:00:41.29
IV.NRCA.HHE. ML:2.3 0.0039299999999999995 0.16 AML other m 2020-12-03T22:00:41.63
IV.MTRA.EHE. ML:1.4 0.00015360155 0.2432 AML other m 2020-12-03T22:00:45.95
IV.MTRA.HNE. ML:1.4 0.00017125748000000002 0.2432 AML other m 2020-12-03T22:00:45.82
IV.MTRA.EHN. ML:1.3 0.00013719505 0.8704 AML other m 2020-12-03T22:00:46.11
IV.MTRA.HNN. ML:1.4 0.0001862532 0.6784 AML other m 2020-12-03T22:00:46.28
IV.LNSS.HHN. ML:2.0 0.0006721368999999999 0.2048 AML other m 2020-12-03T22:00:46.74
IV.LNSS.HNN. ML:2.0 0.0006766838499999999 0.1664 AML other m 2020-12-03T22:00:46.75
IV.FDMO.HHN. ML:1.6 0.00023050569999999998 0.3584 AML other m 2020-12-03T22:00:46.89
IV.FDMO.HHE. ML:1.5 0.0001729873 0.3712 AML other m 2020-12-03T22:00:46.91
IV.LNSS.HHE. ML:2.2 0.0010750000000000002 0.12 AML other m 2020-12-03T22:00:47.02
IV.LNSS.HNE. ML:2.2 0.001015 0.12 AML other m 2020-12-03T22:00:47.08
IV.CESI.HHE. ML:1.5 0.00017571605 0.1408 AML other m 2020-12-03T22:00:47.85
IV.CESI.HHN. ML:1.8 0.00027800000000000004 0.14 AML other m 2020-12-03T22:00:48.08
IV.CSP1.EHN. ML:2.0 0.00053839615 0.4096 AML other m 2020-12-03T22:00:48.83
IV.CSP1.EHE. ML:1.9 0.0003695006 0.1408 AML other m 2020-12-03T22:00:49.18
IV.GUMA.HHN. ML:2.2 0.000732 1.7 AML other m 2020-12-03T22:00:50.14
IV.GUMA.HNE. ML:2.0 0.0004381087 0.2944 AML other m 2020-12-03T22:00:50.15
IV.ARRO.EHE. ML:1.4 0.00007929556999999999 0.3968 AML other m 2020-12-03T22:00:51.19
IV.SAP2.EHE. ML:1.9 0.00027449999999999995 0.16 AML other m 2020-12-03T22:00:51.82
IV.SAP2.EHN. ML:2.8 0.0022400000000000002 0.18 AML other m 2020-12-03T22:00:51.90
IV.MOMA.HHN. ML:1.2 0.000043797414999999996 0.1536 AML other m 2020-12-03T22:00:53.59
IV.MOMA.HHE. ML:1.2 0.00004789802 0.2432 AML other m 2020-12-03T22:00:54.04
IV.EL6.EHE. ML:1.6 0.00009027115999999999 0.128 AML other m 2020-12-03T22:00:56.58
IV.EL6.EHN. ML:1.8 0.00014510984999999997 0.1408 AML other m 2020-12-03T22:00:56.00
IV.SSFR.HHE. ML:1.4 0.00004163175 0.256 AML other m 2020-12-03T22:01:02.00
IV.SSFR.HHN. ML:1.5 0.000047373510000000004 0.3072 AML other m 2020-12-03T22:01:02.66
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