Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 04-12-2020 and time 18:57:19 (Italy) in region 4 km NE Norcia (PG)

A magnitude ML 1.3 earthquake occured in region: 4 km NE Norcia (PG), on

  • 04-12-2020 17:57:19 (UTC)
  • 04-12-2020 18:57:19 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8100, 13.1310 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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
Cascia PG 14 3217 9179
Visso MC 14 1107 10286
Arquata del Tronto AP 14 1178 11464
Ussita MC 15 444 11908
Accumoli RI 16 667 12575
Montegallo AP 17 523 13098
Cerreto di Spoleto PG 18 1075 14173
Sellano PG 19 1079 15252
Montemonaco AP 19 604 15856
Poggiodomo PG 19 117 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
69 Km E of Perugia (166134 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
97 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
Reviewed
Rev100 		ML 1.3 2020-12-04
17:57:19		 42.8103 13.1313 11 2020-12-04
18:04:06		 Sala Sismica INGV-Roma 85200321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-04 17:57:19 ± 0.07
Latitude 42.8103 ± 0.0036
Longitude 13.1313 ± 0.0074
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85200321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 580
Semi-minor axis of confidence ellipse (meter) 355
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 79
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) 122
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34174
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 15
Type of magnitude ML
Reference to an origin 85200321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-04 18:04:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SENI.HNZ. 2020-12-04T17:57:35.42 3.0 positive manual P -0.14 0
IV.CSP1.EHZ. 2020-12-04T17:57:30.29 0.6 undecidable manual S 11 31.746 50 0.05 49
IV.CESI.HHZ. 2020-12-04T17:57:29.38 0.6 undecidable manual S 320 28.3494 50 0.05 49
IV.FDMO.HHZ. 2020-12-04T17:57:28.41 0.6 undecidable manual S 352 25.3524 50 -0.11 49
IV.LNSS.HHZ. 2020-12-04T17:57:28.19 0.6 undecidable manual S 198 24.1536 50 -0.02 50
IT.MTCL.HGZ. 2020-12-04T17:57:27.70 0.6 undecidable manual S 332 23.0547 50 -0.2 48
IV.TERO.HHZ. 2020-12-04T17:57:27.58 3.0 undecidable manual P 0.62 0
IV.CAMP.HHE. 2020-12-04T17:57:26.00 0.1 undecidable manual P 143 37.9287 50 -0.51 88
IV.MMO1.EHZ. 2020-12-04T17:57:26.37 0.3 undecidable manual S 58 18.6702 119 -0.24 72
IV.MF5.EHN. 2020-12-04T17:57:26.07 0.1 undecidable manual P 53 33.1446 50 0.3 93
IV.GUMA.HNE. 2020-12-04T17:57:25.43 0.1 undecidable manual P 31 32.5452 50 -0.25 94
IV.CESI.HHZ. 2020-12-04T17:57:25.15 0.1 undecidable manual P 320 28.3494 50 0.11 98
IV.CSP1.EHZ. 2020-12-04T17:57:25.60 0.1 undecidable manual P 11 31.746 50 0.04 98
IV.SMA1.EHE. 2020-12-04T17:57:24.99 0.1 undecidable manual P 140 25.9518 50 0.32 94
IV.LNSS.HHZ. 2020-12-04T17:57:24.34 0.1 undecidable manual P 198 24.1536 50 -0.05 100
IV.MC2.EHZ. 2020-12-04T17:57:24.92 0.6 undecidable manual S 23 12.1767 131 0.18 49
IV.FDMO.HHZ. 2020-12-04T17:57:24.51 0.1 undecidable manual P 352 25.3524 50 -0.06 99
IT.MTCL.HGZ. 2020-12-04T17:57:24.17 0.1 undecidable manual P 332 23.0547 50 -0.04 100
IV.T1299.EHZ. 2020-12-04T17:57:24.38 0.1 undecidable manual P 148 23.0547 50 0.16 98
IV.MMO1.EHZ. 2020-12-04T17:57:23.39 0.1 undecidable manual P 58 18.6702 119 -0.08 100
IV.NRCA.HNZ. 2020-12-04T17:57:22.68 0.6 undecidable manual S 332 2.8971 164 -0.27 49
IV.MC2.EHZ. 2020-12-04T17:57:22.66 0.1 undecidable manual P 23 12.1767 131 0.28 97
IV.NRCA.HNZ. 2020-12-04T17:57:21.55 1.0 positive manual P 332 2.8971 164 0.2 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.6 0.00067111515 0.0768 AML other m 2020-12-04T17:57:23.05
IV.NRCA.HHN. ML:1.9 0.00145519 0.1152 AML other m 2020-12-04T17:57:22.89
IV.NRCA.HNE. ML:1.6 0.00067077685 0.0768 AML other m 2020-12-04T17:57:23.04
IV.NRCA.HNN. ML:1.9 0.00133386595 0.128 AML other m 2020-12-04T17:57:22.89
IV.LNSS.HHE. ML:1.5 0.00018283445 0.1024 AML other m 2020-12-04T17:57:28.68
IV.LNSS.HHN. ML:1.4 0.0001430683 0.1536 AML other m 2020-12-04T17:57:28.70
IV.LNSS.HNE. ML:1.4 0.00016793999500000001 0.1152 AML other m 2020-12-04T17:57:28.67
IV.LNSS.HNN. ML:1.4 0.00015307821500000002 0.1664 AML other m 2020-12-04T17:57:28.78
IV.FDMO.HHE. ML:0.8 0.000042428225 0.2432 AML other m 2020-12-04T17:57:29.30
IV.FDMO.HHN. ML:1.0 0.00005283209 0.1664 AML other m 2020-12-04T17:57:29.11
IV.CESI.HHE. ML:0.9 0.00004078855 0.1152 AML other m 2020-12-04T17:57:29.61
IV.CESI.HHN. ML:1.0 0.000047076405 0.1408 AML other m 2020-12-04T17:57:29.77
IV.CSP1.EHE. ML:1.3 0.00009368680499999999 0.1152 AML other m 2020-12-04T17:57:31.41
IV.CSP1.EHN. ML:1.2 0.000075964805 0.128 AML other m 2020-12-04T17:57:30.54
IV.TERO.HHE. ML:0.5 0.000011880675 0.0896 AML other m 2020-12-04T17:57:34.07
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