Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 30-12-2021 and time 04:03:43 (Italy) in region 1 km N Norcia (PG)

A magnitude ML 0.8 earthquake occured in region: 1 km N Norcia (PG), on

  • 30-12-2021 03:03:43 (UTC)
  • 30-12-2021 04:03:43 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7980, 13.0950 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 1 4957 4957
Preci PG 10 724 5681
Cascia PG 11 3217 8898
Castelsantangelo sul Nera MC 12 281 9179
Cerreto di Spoleto PG 15 1075 10254
Visso MC 15 1107 11361
Poggiodomo PG 16 117 11478
Ussita MC 17 444 11922
Arquata del Tronto AP 17 1178 13100
Accumoli RI 17 667 13767
Sellano PG 17 1079 14846
Vallo di Nera PG 19 364 15210
Monteleone di Spoleto PG 20 599 15809

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km E of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
52 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
67 Km SE of Perugia (166134 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
99 Km W of Pescara (121014 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 0.8 2021-12-30
03:03:43		 42.7983 13.0952 10 2022-03-30
13:04:25		 Bollettino Sismico Italiano INGV 99226251
Reviewed
Rev100 		ML 1.0 2021-12-30
03:03:43		 42.8042 13.0962 11 2021-12-30
03:09:59		 Sala Sismica INGV-Roma 99136741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-30 03:03:43 ± 0.04
Latitude 42.7983 ± 0.0018
Longitude 13.0952 ± 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 99226251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 314
Semi-minor axis of confidence ellipse (meter) 184
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) 310.0
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 24
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.30397
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 99136741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-30 03:09:59

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 99226251
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-01 13:46:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-12-30T03:03:55.13 0.3 undecidable manual S 15 33.744 50 0.17 69
IV.CESI.HHZ. 2021-12-30T03:03:53.26 0.6 undecidable manual S 326 27.6501 50 -0.07 48
IV.SMA1.EHZ. 2021-12-30T03:03:53.62 0.6 undecidable manual S 133 27.0507 50 0.46 44
IV.MTRA.HNZ. 2021-12-30T03:03:52.55 0.1 undecidable manual S 101 24.9528 50 -0.06 96
IV.FDMO.HHZ. 2021-12-30T03:03:52.69 0.3 undecidable manual S 359 26.4513 50 -0.31 68
IV.GAVE.HNZ. 2021-12-30T03:03:51.12 0.1 undecidable manual S 234 20.1687 117 -0.05 97
IV.MMO1.EHZ. 2021-12-30T03:03:51.52 0.3 undecidable manual S 59 21.9669 115 -0.2 70
IV.LNSS.HHZ. 2021-12-30T03:03:51.85 0.3 undecidable manual S 192 22.1556 115 0.07 72
IV.MTCL.HGZ. 2021-12-30T03:03:51.82 3.0 undecidable manual S 0
IV.MTCL.HGZ. 2021-12-30T03:03:51.79 3.0 undecidable manual P 0
IV.FEMA.HNZ. 2021-12-30T03:03:50.91 0.1 undecidable manual S 349 18.5703 119 0.24 93
IV.CSP1.EHZ. 2021-12-30T03:03:50.08 0.6 positive manual P 15 33.744 50 0.04 47
IV.MC2.EHZ. 2021-12-30T03:03:49.70 0.1 undecidable manual S 31 14.6742 125 0.17 96
IV.CESI.HHZ. 2021-12-30T03:03:49.21 1.0 undecidable manual P 326 27.6501 50 0.11 24
IV.SMA1.EHZ. 2021-12-30T03:03:49.32 1.0 negative manual P 133 27.0507 50 0.32 23
IV.FDMO.HHZ. 2021-12-30T03:03:48.84 0.1 undecidable manual P 359 26.4513 50 -0.07 96
IV.MMO1.EHZ. 2021-12-30T03:03:48.07 0.1 undecidable manual P 59 21.9669 115 -0.09 96
IV.MTRA.HNZ. 2021-12-30T03:03:48.52 0.1 undecidable manual P 101 24.9528 50 -0.16 94
IV.LNSS.HHZ. 2021-12-30T03:03:48.15 0.3 undecidable manual P 192 22.1556 115 -0.05 72
IV.FEMA.HNZ. 2021-12-30T03:03:47.54 0.1 undecidable manual P 349 18.5703 119 -0.02 98
IV.MC2.EHZ. 2021-12-30T03:03:47.14 0.1 undecidable manual P 31 14.6742 125 0.23 94
IV.GAVE.HNZ. 2021-12-30T03:03:47.84 0.1 undecidable manual P 234 20.1687 117 -0.01 98
IV.NRCA.HHZ. 2021-12-30T03:03:46.92 0.1 undecidable manual S 22 4.1958 158 -0.25 96
IV.NRCA.HHZ. 2021-12-30T03:03:45.57 0.1 undecidable manual P 22 4.1958 158 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.1 0.00022549999999999998 1.88 AML other m 2021-12-30T03:03:46.98
IV.NRCA.HHE. ML:1.0 0.000165 0.08 AML other m 2021-12-30T03:03:47.59
IV.LNSS.HHN. ML:0.9 0.000048 0.94 AML other m 2021-12-30T03:03:52.09
IV.LNSS.HHE. ML:0.9 0.0000502 1.66 AML other m 2021-12-30T03:03:52.14
IV.MC2.EHN. ML:1.1 0.00010840049 0.3392 AML other m 2021-12-30T03:03:50.93
IV.MC2.EHE. ML:1.0 0.0000903978805 0.1808 AML other m 2021-12-30T03:03:51.05
IV.MMO1.EHE. ML:0.8 0.000041269995 0.1792 AML other m 2021-12-30T03:03:51.71
IV.MMO1.EHN. ML:0.5 0.000018982726999999998 0.1808 AML other m 2021-12-30T03:03:52.82
IV.FDMO.HHN. ML:0.4 0.000015896300000000002 0.2608 AML other m 2021-12-30T03:03:52.85
IV.FDMO.HHE. ML:0.6 0.000019120949 0.1792 AML other m 2021-12-30T03:03:54.59
IV.CESI.HHN. ML:0.7 0.000024199779999999997 0.2592 AML other m 2021-12-30T03:03:53.32
IV.CESI.HHE. ML:1.0 0.00005004934 4.5808 AML other m 2021-12-30T03:03:54.31
IV.SMA1.EHN. ML:0.4 0.00001669153 1.44 AML other m 2021-12-30T03:03:53.95
IV.SMA1.EHE. ML:0.3 0.000010407467999999999 1.08 AML other m 2021-12-30T03:03:53.31
IV.CSP1.EHE. ML:1.0 0.0000398500055 0.16 AML other m 2021-12-30T03:03:55.66
IV.CSP1.EHN. ML:1.1 0.0000496901235 0.16 AML other m 2021-12-30T03:03:55.14
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