Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 27-12-2021 and time 10:44:49 (UTC) in region 4 km S Norcia (PG)

A magnitude ML 1.6 earthquake occured in region: 4 km S Norcia (PG), on

  • 27-12-2021 10:44:49 (UTC)
  • 27-12-2021 11:44:49 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7560, 13.0810 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
Cascia PG 7 3217 8174
Poggiodomo PG 13 117 8291
Preci PG 14 724 9015
Cerreto di Spoleto PG 15 1075 10090
Accumoli RI 15 667 10757
Monteleone di Spoleto PG 16 599 11356
Castelsantangelo sul Nera MC 17 281 11637
Cittareale RI 17 482 12119
Vallo di Nera PG 18 364 12483
Arquata del Tronto AP 18 1178 13661
Sellano PG 19 1079 14740
Visso MC 20 1107 15847

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km SE of Foligno (57155 inhabitants)
42 Km NE of Terni (111501 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
52 Km W of Teramo (54892 inhabitants)
69 Km SE of Perugia (166134 inhabitants)
88 Km E of Viterbo (67173 inhabitants)
89 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km N of Tivoli (56533 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
98 Km W of Pescara (121014 inhabitants)
100 Km W 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 1.6 2021-12-27
10:44:49		 42.7565 13.0807 10 2022-03-30
13:04:31		 Bollettino Sismico Italiano INGV 99853511
Reviewed
Rev100 		ML 1.6 2021-12-27
10:44:49		 42.7557 13.0732 9 2021-12-27
10:51:09		 Sala Sismica INGV-Roma 99052261
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-27 10:44:49 ± 0.04
Latitude 42.7565 ± 0.0027
Longitude 13.0807 ± 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 99853511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 249
Semi-minor axis of confidence ellipse (meter) 241
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 249
Circular confidence region, given by single value of horizontal uncertainty (meter) 250.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.08094
Epicentral distance of station farthest from the epicenter (degree) 1.02163
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 22
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 99052261
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-27 10:51:09

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 99853511
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-16 16:05:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-12-27T10:48:09.60 3.0 undecidable manual S 2 63.5919 50 9.999 0
IV.CRTC.HHZ. 2021-12-27T10:45:10.88 3.0 negative manual P 113.3976 2.77 0
IV.ATCC.EHZ. 2021-12-27T10:45:08.30 3.0 undecidable manual S 323 59.496 50 0.63 0
IV.SNTG.HHZ. 2021-12-27T10:45:07.30 1.0 undecidable manual S 348 56.499 50 0.44 21
IV.ASSB.HHZ. 2021-12-27T10:45:04.30 1.0 undecidable manual S 313 46.7199 50 0.04 24
IV.GUMA.HHZ. 2021-12-27T10:45:03.10 3.0 undecidable manual S 31 39.7269 50 0.69 0
IV.MF5.EHZ. 2021-12-27T10:45:03.50 3.0 undecidable manual S 50 40.1265 50 1 0
IV.MOMA.HHZ. 2021-12-27T10:45:03.30 1.0 undecidable manual S 277 41.9247 50 0.33 23
IV.TERO.HHZ. 2021-12-27T10:45:03.70 0.6 undecidable manual S 109 45.2214 50 -0.15 46
IV.CSP1.EHZ. 2021-12-27T10:45:02.10 1.0 undecidable manual S 15 38.5281 50 0.02 24
IV.MURB.HHE. 2021-12-27T10:45:01.45 0.3 undecidable manual P 321 72.0723 50 -0.28 64
IV.MNTT.EHZ. 2021-12-27T10:45:01.41 3.0 positive manual P 53.8017 2.48 0
IV.EL6.EHZ. 2021-12-27T10:45:00.71 0.3 undecidable manual P 2 63.5919 50 0.28 66
IV.CESI.HHZ. 2021-12-27T10:44:59.80 0.6 undecidable manual S 333 31.0467 50 -0.28 46
IV.SNTG.HHZ. 2021-12-27T10:44:59.32 0.3 undecidable manual P 348 56.499 50 -0.01 70
IV.ATCC.EHZ. 2021-12-27T10:44:59.85 0.3 undecidable manual P 323 59.496 50 0.05 69
IV.FDMO.HHZ. 2021-12-27T10:44:59.70 3.0 undecidable manual S 1 31.0467 50 -0.38 0
IV.SMA1.EHZ. 2021-12-27T10:44:58.50 1.0 undecidable manual S 124 25.0527 111 0.13 24
IV.MF5.EHZ. 2021-12-27T10:44:57.16 0.3 undecidable manual P 50 40.1265 50 0.35 67
IV.GUMA.HHZ. 2021-12-27T10:44:57.06 0.3 undecidable manual P 31 39.7269 50 0.3 68
IV.TERO.HHZ. 2021-12-27T10:44:57.33 0.3 undecidable manual P 109 45.2214 50 -0.26 68
IV.ASSB.HHZ. 2021-12-27T10:44:57.85 0.3 undecidable manual P 313 46.7199 50 0.02 71
IV.MOMA.HHZ. 2021-12-27T10:44:57.14 0.3 undecidable manual P 277 41.9247 50 0.05 71
IV.PF6.EHN. 2021-12-27T10:44:57.14 0.1 undecidable manual P 12 43.3233 50 -0.16 93
IV.CSP1.EHZ. 2021-12-27T10:44:56.59 0.1 undecidable manual P 15 38.5281 50 0.02 97
IV.MC2.EHZ. 2021-12-27T10:44:56.80 0.6 undecidable manual S 27 19.3695 117 0.25 48
IV.CESI.HHZ. 2021-12-27T10:44:55.26 0.1 undecidable manual P 333 31.0467 50 -0.15 95
IV.LNSS.HHZ. 2021-12-27T10:44:55.90 0.3 undecidable manual S 191 17.3715 119 -0.05 75
IV.GAVE.EHZ. 2021-12-27T10:44:55.70 0.3 undecidable manual S 245 16.7721 120 -0.08 74
IV.FDMO.HHZ. 2021-12-27T10:44:55.31 0.1 undecidable manual P 1 31.0467 50 -0.11 96
IV.MTRA.EHE. 2021-12-27T10:44:54.41 0.3 undecidable manual P 90 25.752 111 -0.15 72
IV.MMO1.EHN. 2021-12-27T10:44:54.46 0.3 undecidable manual P 52 25.5522 111 -0.06 73
IV.SMA1.EHZ. 2021-12-27T10:44:54.45 0.1 undecidable manual P 124 25.0527 111 0.02 99
IV.FEMA.HNE. 2021-12-27T10:44:54.02 0.3 undecidable manual P 354 22.9548 113 -0.02 74
IT.MTCL.HGZ. 2021-12-27T10:44:54.72 0.3 undecidable manual P 346 27.1506 50 -0.1 73
IV.MC2.EHZ. 2021-12-27T10:44:53.57 0.3 undecidable manual P 27 19.3695 117 0.19 72
IV.NRCA.HHZ. 2021-12-27T10:44:53.30 0.3 undecidable manual S 18 8.9799 137 -0.35 71
IV.LNSS.HHZ. 2021-12-27T10:44:53.12 0.1 undecidable manual P 191 17.3715 119 0.09 99
IV.GAVE.EHZ. 2021-12-27T10:44:53.08 0.1 undecidable manual P 245 16.7721 120 0.15 98
IV.NRCA.HHZ. 2021-12-27T10:44:51.80 0.1 undecidable manual P 18 8.9799 137 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.8 0.0009545 0.18 AML other m 2021-12-27T10:44:53.48
IV.NRCA.HNE. ML:1.8 0.0009319999999999999 0.18 AML other m 2021-12-27T10:44:53.48
IV.NRCA.HNN. ML:1.6 0.0005955 0.82 AML other m 2021-12-27T10:44:53.69
IV.NRCA.HHN. ML:1.6 0.0005595 0.84 AML other m 2021-12-27T10:44:53.69
IV.LNSS.HHE. ML:1.8 0.00048550000000000004 1 AML other m 2021-12-27T10:44:56.19
IV.LNSS.HHN. ML:1.7 0.00039600000000000003 0.1 AML other m 2021-12-27T10:44:56.52
IV.GAVE.EHE. ML:1.7 0.00039949999999999995 0.14 AML other m 2021-12-27T10:44:56.50
IV.GAVE.EHN. ML:1.5 0.00029039360000000005 0.32 AML other m 2021-12-27T10:44:56.01
IV.MC2.EHE. ML:1.6 0.000313 1.46 AML other m 2021-12-27T10:44:57.15
IV.MC2.EHN. ML:1.9 0.000587 1.82 AML other m 2021-12-27T10:44:57.03
IV.FDMO.HHN. ML:1.5 0.0001597 1.36 AML other m 2021-12-27T10:44:59.26
IV.FDMO.HHE. ML:1.4 0.00010322912 0.16 AML other m 2021-12-27T10:44:59.96
IV.CESI.HHE. ML:1.3 0.00010215 0.64 AML other m 2021-12-27T10:45:00.10
IV.CESI.HHN. ML:1.7 0.00023199999999999997 1.12 AML other m 2021-12-27T10:45:00.05
IV.SMA1.EHN. ML:1.4 0.0001615 0.88 AML other m 2021-12-27T10:45:01.47
IV.SMA1.EHE. ML:1.6 0.0002155 0.32 AML other m 2021-12-27T10:45:01.59
IV.CSP1.EHE. ML:1.6 0.0001555 0.86 AML other m 2021-12-27T10:45:02.42
IV.CSP1.EHN. ML:1.8 0.0002305 0.74 AML other m 2021-12-27T10:45:03.52
IV.MOMA.HHE. ML:1.5 0.00011149999999999999 0.14 AML other m 2021-12-27T10:45:04.18
IV.GUMA.HHN. ML:1.6 0.000142 1.38 AML other m 2021-12-27T10:45:04.92
IV.ASSB.HHN. ML:1.4 0.00006405 0.16 AML other m 2021-12-27T10:45:05.12
IV.MOMA.HHN. ML:1.3 0.0000663 0.22 AML other m 2021-12-27T10:45:05.30
IV.ASSB.HHE. ML:1.2 0.00004950665 0.4224 AML other m 2021-12-27T10:45:04.88
IV.GUMA.HHE. ML:1.4 0.000090734815 0.1792 AML other m 2021-12-27T10:45:04.14
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