Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 30-12-2021 and time 04:11:19 (Italy) in region 2 km NE Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 2 km NE Norcia (PG), on

  • 30-12-2021 03:11:19 (UTC)
  • 30-12-2021 04:11:19 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8040, 13.1150 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 2 4957 4957
Preci PG 10 724 5681
Castelsantangelo sul Nera MC 11 281 5962
Cascia PG 13 3217 9179
Visso MC 14 1107 10286
Arquata del Tronto AP 15 1178 11464
Ussita MC 16 444 11908
Cerreto di Spoleto PG 16 1075 12983
Accumoli RI 16 667 13650
Poggiodomo PG 18 117 13767
Sellano PG 18 1079 14846
Montegallo AP 18 523 15369

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
51 Km W of Teramo (54892 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
97 Km N of Tivoli (56533 inhabitants)
98 Km W of Pescara (121014 inhabitants)
100 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 0.9 2021-12-30
03:11:19		 42.8043 13.1147 10 2022-03-30
13:04:25		 Bollettino Sismico Italiano INGV 99227201
Reviewed
Rev100 		ML 1.1 2021-12-30
03:11:19		 42.8057 13.1192 10 2021-12-30
04:12:39		 Sala Sismica INGV-Roma 99137031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-30 03:11:19 ± 0.08
Latitude 42.8043 ± 0.0045
Longitude 13.1147 ± 0.0061
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 99227201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 526
Semi-minor axis of confidence ellipse (meter) 414
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 288
Circular confidence region, given by single value of horizontal uncertainty (meter) 530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 58
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40290
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 24
Type of magnitude ML
Reference to an origin 99137031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-30 04:12:39

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 99227201
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-01 14:06:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-12-30T03:11:34.25 0.3 undecidable manual S 117 44.7219 50 -0.16 68
IV.MF5.EHZ. 2021-12-30T03:11:32.42 0.3 undecidable manual S 54 34.6431 50 0.69 60
IV.SMA1.EHZ. 2021-12-30T03:11:29.94 0.3 undecidable manual S 137 26.3514 50 0.42 67
IV.CESI.HHZ. 2021-12-30T03:11:29.89 0.1 undecidable manual S 323 28.0497 50 -0.08 95
IV.FDMO.HHZ. 2021-12-30T03:11:28.96 0.6 undecidable manual S 355 25.8519 50 -0.42 44
IV.GAVE.HNZ. 2021-12-30T03:11:28.28 0.3 undecidable manual S 235 21.867 115 0.16 71
IV.LNSS.HHZ. 2021-12-30T03:11:28.51 0.1 undecidable manual S 195 23.1546 113 -0.02 97
IV.MF5.EHZ. 2021-12-30T03:11:27.02 0.1 undecidable manual P 54 34.6431 50 0.34 89
IV.TERO.HHZ. 2021-12-30T03:11:27.87 0.1 undecidable manual P 117 44.7219 50 -0.36 87
IV.MMO1.EHZ. 2021-12-30T03:11:27.15 0.1 undecidable manual S 59 20.2686 116 -0.46 89
IV.FEMA.HNZ. 2021-12-30T03:11:27.09 0.3 undecidable manual S 343 18.2706 119 0.08 73
IV.MOMA.HNZ. 2021-12-30T03:11:27.61 0.1 undecidable manual P 270 44.3223 50 -0.56 83
IV.CESI.HHZ. 2021-12-30T03:11:25.51 0.3 undecidable manual P 323 28.0497 50 -0.15 70
IV.FOPC.HGZ. 2021-12-30T03:11:25.93 3.0 undecidable manual P 0
IV.MC2.EHZ. 2021-12-30T03:11:25.66 0.1 undecidable manual S 27 13.3755 127 0.09 97
IV.FDMO.HHZ. 2021-12-30T03:11:25.23 0.3 undecidable manual P 355 25.8519 50 -0.09 71
IV.SMA1.EHZ. 2021-12-30T03:11:25.29 0.1 undecidable manual P 137 26.3514 50 -0.11 95
IV.MMO1.EHZ. 2021-12-30T03:11:24.14 0.1 undecidable manual P 59 20.2686 116 -0.16 95
IV.FEMA.HNZ. 2021-12-30T03:11:24.67 0.1 undecidable manual P 343 18.2706 119 0.71 81
IV.LNSS.HHZ. 2021-12-30T03:11:24.98 0.3 undecidable manual P 195 23.1546 113 0.15 71
IV.GAVE.HNZ. 2021-12-30T03:11:24.90 0.6 undecidable manual P 235 21.867 115 0.31 46
IV.NRCA.HHZ. 2021-12-30T03:11:23.13 0.1 undecidable manual S 360 3.2967 162 -0.3 95
IV.MC2.EHZ. 2021-12-30T03:11:23.31 0.1 undecidable manual P 27 13.3755 127 0.19 95
IV.NRCA.HHZ. 2021-12-30T03:11:21.93 0.1 undecidable manual P 360 3.2967 162 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:1.1 0.00023385434999999998 0.6496 AML other m 2021-12-30T03:11:22.18
IV.MC2.EHN. ML:0.5 0.00003019367 0.36 AML other m 2021-12-30T03:11:26.01
IV.NRCA.HNE. ML:1.3 0.0003680585 0.1504 AML other m 2021-12-30T03:11:23.20
IV.NRCA.HHE. ML:1.3 0.00039 0.14 AML other m 2021-12-30T03:11:23.27
IV.NRCA.HHN. ML:1.1 0.00023649999999999998 0.14 AML other m 2021-12-30T03:11:23.20
IV.CESI.HHE. ML:0.5 0.000017310095000000002 0.2384 AML other m 2021-12-30T03:11:30.46
IV.CESI.HNE. ML:1.0 0.00005503049 0.7808 AML other m 2021-12-30T03:11:29.75
IV.MC2.EHE. ML:0.9 0.00007779281999999999 0.24 AML other m 2021-12-30T03:11:26.74
IV.MF5.EHN. ML:1.5 0.000141978 1.7184 AML other m 2021-12-30T03:11:27.08
IV.LNSS.HHN. ML:0.5 0.000021536329999999998 0.3808 AML other m 2021-12-30T03:11:28.99
IV.CESI.HHN. ML:0.8 0.00003521299 0.2816 AML other m 2021-12-30T03:11:30.26
IV.SMA1.EHE. ML:0.7 0.000031585500000000004 0.7792 AML other m 2021-12-30T03:11:31.55
IV.LNSS.HNE. ML:1.1 0.00007330649 0.8704 AML other m 2021-12-30T03:11:29.07
IV.LNSS.HHE. ML:0.6 0.000024469712 1.68 AML other m 2021-12-30T03:11:28.89
IV.LNSS.HNN. ML:1.3 0.00013071720000000002 0.64 AML other m 2021-12-30T03:11:38.18
IV.SMA1.EHN. ML:0.6 0.00002026052 1.5408 AML other m 2021-12-30T03:11:29.45
IV.MF5.EHE. ML:0.7 0.000022162269999999997 1.28 AML other m 2021-12-30T03:11:32.84
IV.CESI.HNN. ML:1.3 0.00010065984 1 AML other m 2021-12-30T03:11:29.62
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