Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 22-12-2021 and time 21:30:32 (Italy) in region 1 km E Norcia (PG)

A magnitude ML 1.1 earthquake occured in region: 1 km E Norcia (PG), on

  • 22-12-2021 20:30:32 (UTC)
  • 22-12-2021 21:30:32 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7980, 13.1080 at 11 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.

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 1 4957 4957
Preci PG 11 724 5681
Castelsantangelo sul Nera MC 12 281 5962
Cascia PG 12 3217 9179
Visso MC 15 1107 10286
Arquata del Tronto AP 16 1178 11464
Cerreto di Spoleto PG 16 1075 12539
Accumoli RI 16 667 13206
Ussita MC 17 444 13650
Poggiodomo PG 17 117 13767
Sellano PG 18 1079 14846
Montegallo AP 19 523 15369

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
46 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)
92 Km E of Viterbo (67173 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
97 Km SW of Ancona (100861 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 1.1 2021-12-22
20:30:32		 42.798 13.1082 11 2022-03-30
13:04:27		 Bollettino Sismico Italiano INGV 99355121
Reviewed
Rev100 		ML 1.6 2021-12-22
20:30:32		 42.7998 13.1067 11 2021-12-22
20:43:05		 Sala Sismica INGV-Roma 98827571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-22 20:30:32 ± 0.06
Latitude 42.7980 ± 0.0027
Longitude 13.1082 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99355121

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 367
Semi-minor axis of confidence ellipse (meter) 322
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 58
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.03597
Epicentral distance of station farthest from the epicenter (degree) 0.40380
Number of stations at which the event was observed 12
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 36
Type of magnitude ML
Reference to an origin 99355121
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-06 08:56:21

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 98827571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-22 20:43:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RM33.EHZ. 2021-12-22T20:30:43.69 0.6 undecidable manual S 165 33.2445 50 -0.01 49
IV.SMA1.EHZ. 2021-12-22T20:30:42.10 0.3 undecidable manual S 135 26.2515 50 0.27 71
IV.CESI.HHZ. 2021-12-22T20:30:42.34 0.3 undecidable manual S 324 28.2495 50 -0.04 74
IV.FDMO.HHZ. 2021-12-22T20:30:41.72 0.6 undecidable manual S 356 26.5512 50 -0.19 48
IV.MTRA.EHE. 2021-12-22T20:30:41.18 0.6 undecidable manual S 101 23.9538 50 -0.04 50
IV.LNSS.HHZ. 2021-12-22T20:30:40.61 0.6 undecidable manual S 194 22.3554 50 -0.19 49
IV.TERO.HHZ. 2021-12-22T20:30:40.44 0.3 undecidable manual P 116 44.8218 50 -0.23 69
IV.MMO1.EHZ. 2021-12-22T20:30:40.26 0.6 undecidable manual S 58 21.0678 50 -0.19 49
IV.GAVE.EHZ. 2021-12-22T20:30:40.28 0.3 undecidable manual S 236 20.9679 50 -0.16 74
IV.CSP1.EHZ. 2021-12-22T20:30:39.05 0.3 undecidable manual P 14 33.5442 50 0.12 73
IV.CESI.HHZ. 2021-12-22T20:30:38.13 0.1 positive manual P 324 28.2495 50 0.01 100
IV.MC2.EHZ. 2021-12-22T20:30:38.72 0.6 undecidable manual S 28 14.1747 127 0.25 49
IV.RM33.EHZ. 2021-12-22T20:30:38.79 0.1 negative manual P 165 33.2445 50 -0.09 97
IV.GAVE.EHZ. 2021-12-22T20:30:37.60 0.3 undecidable manual P 236 20.9679 50 0.6 66
IV.LNSS.HHZ. 2021-12-22T20:30:37.21 0.3 undecidable manual P 194 22.3554 50 0.01 76
IV.SMA1.EHZ. 2021-12-22T20:30:37.70 0.3 undecidable manual P 135 26.2515 50 -0.1 74
IV.MMO1.EHZ. 2021-12-22T20:30:37.04 0.3 undecidable manual P 58 21.0678 50 0.03 76
IV.FDMO.HHZ. 2021-12-22T20:30:37.83 0.1 positive manual P 356 26.5512 50 -0.02 100
IV.MTRA.EHE. 2021-12-22T20:30:37.49 0.1 positive manual P 101 23.9538 50 0.04 100
IV.MC2.EHZ. 2021-12-22T20:30:36.15 0.3 undecidable manual P 28 14.1747 127 0.29 72
IV.NRCA.HHZ. 2021-12-22T20:30:35.87 0.3 undecidable manual S 7 3.996 160 -0.4 72
IV.NRCA.HHZ. 2021-12-22T20:30:34.64 0.3 undecidable manual P 7 3.996 160 0.05 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.5 0.000012681010000000002 44.2368 AML other m 2021-12-22T20:30:37.73
IV.NRCA.HHE. ML:1.7 0.000833 1.92 AML other m 2021-12-22T20:30:35.96
IV.NRCA.HNE. ML:1.7 0.0008195 1.94 AML other m 2021-12-22T20:30:35.97
IV.NRCA.HNN. ML:1.7 0.0009203215 0.064 AML other m 2021-12-22T20:30:35.99
IV.NRCA.HHN. ML:1.8 0.0010550000000000002 0.06 AML other m 2021-12-22T20:30:35.96
IV.MMO1.HNE. ML:2.9 0.005232772499999999 0.6656 AML other m 2021-12-22T20:30:37.09
IV.MMO1.HNN. ML:2.8 0.0042396709999999995 0.512 AML other m 2021-12-22T20:30:38.37
IV.MC2.EHN. ML:0.9 0.000082818295 0.1536 AML other m 2021-12-22T20:30:39.30
IV.MC2.EHE. ML:1.0 0.00009693285 0.2816 AML other m 2021-12-22T20:30:40.17
IV.LNSS.HNN. ML:1.2 0.000116414158 0.7168 AML other m 2021-12-22T20:30:40.33
IV.MMO1.EHN. ML:0.6 0.000023745405000000002 0.1408 AML other m 2021-12-22T20:30:40.45
IV.MMO1.EHE. ML:0.6 0.000028972785999999996 0.1152 AML other m 2021-12-22T20:30:40.56
IV.GAVE.EHN. ML:0.8 0.000042143614999999995 0.256 AML other m 2021-12-22T20:30:40.67
IV.SMA1.EHN. ML:0.6 0.0000209951914 0.4992 AML other m 2021-12-22T20:30:41.43
IV.GAVE.EHE. ML:0.8 0.000043537155000000004 0.1792 AML other m 2021-12-22T20:30:41.24
IV.LNSS.HHE. ML:0.8 0.00003950603 0.0768 AML other m 2021-12-22T20:30:41.36
IV.LNSS.HHN. ML:0.8 0.000044773195 0.1152 AML other m 2021-12-22T20:30:41.52
IV.GAVE.HNN. ML:1.4 0.0001854233 0.9344 AML other m 2021-12-22T20:30:41.59
IV.FDMO.HHN. ML:0.4 0.000014951090000000001 0.1664 AML other m 2021-12-22T20:30:42.44
IV.LNSS.HNE. ML:1.2 0.00011195771000000001 0.7552 AML other m 2021-12-22T20:30:43.77
IV.RM33.HNN. ML:1.6 0.000150831055 0.7168 AML other m 2021-12-22T20:30:44.90
IV.SMA1.EHE. ML:0.7 0.0000249426045 0.4096 AML other m 2021-12-22T20:30:45.33
IV.GAVE.HNE. ML:1.2 0.000115398345 0.5632 AML other m 2021-12-22T20:30:46.64
IV.CESI.HNE. ML:1.3 0.00009537640244999999 0.576 AML other m 2021-12-22T20:30:48.97
IV.CESI.HHN. ML:0.8 0.00003445329 1.1392 AML other m 2021-12-22T20:30:49.13
IV.RM33.EHE. ML:0.7 0.000022287615 0.7424 AML other m 2021-12-22T20:30:49.75
IV.TERO.HNN. ML:1.7 0.0001496229 0.7936 AML other m 2021-12-22T20:30:51.48
IV.CESI.HNN. ML:1.5 0.00017230819749999997 0.7936 AML other m 2021-12-22T20:30:51.23
IV.CSP1.EHN. ML:1.3 0.00008234732 1.4592 AML other m 2021-12-22T20:30:51.32
IV.RM33.EHN. ML:0.9 0.000032855579999999996 1.344 AML other m 2021-12-22T20:30:51.82
IV.FDMO.HHE. ML:0.6 0.000019188484999999997 0.9088 AML other m 2021-12-22T20:30:51.92
IV.RM33.HNE. ML:1.6 0.00015075078499999999 0.7424 AML other m 2021-12-22T20:30:53.22
IV.CSP1.EHE. ML:1.2 0.00006629097 1.6 AML other m 2021-12-22T20:30:53.19
IV.TERO.HHE. ML:1.6 0.000114943595 0.4224 AML other m 2021-12-22T20:30:53.57
IV.TERO.HNE. ML:1.6 0.00010718437 0.832 AML other m 2021-12-22T20:30:56.20
IV.TERO.HHN. ML:1.0 0.00003204101 1.2032 AML other m 2021-12-22T20:30:57.39
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