Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 22-11-2021 and time 20:20:40 (Italy) in region 4 km SW Norcia (PG)

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

  • 22-11-2021 19:20:40 (UTC)
  • 22-11-2021 20:20:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7620, 13.0600 at 11 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.

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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 5 4957 4957
Cascia PG 6 3217 8174
Poggiodomo PG 12 117 8291
Preci PG 13 724 9015
Cerreto di Spoleto PG 13 1075 10090
Monteleone di Spoleto PG 15 599 10689
Vallo di Nera PG 16 364 11053
Castelsantangelo sul Nera MC 17 281 11334
Accumoli RI 17 667 12001
Cittareale RI 18 482 12483
Sellano PG 18 1079 13562
Sant'Anatolia di Narco PG 19 564 14126
Visso MC 19 1107 15233
Scheggino PG 19 461 15694
Arquata del Tronto AP 19 1178 16872

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km SE of Foligno (57155 inhabitants)
40 Km NE of Terni (111501 inhabitants)
53 Km NW of L'Aquila (69753 inhabitants)
54 Km W of Teramo (54892 inhabitants)
67 Km SE of Perugia (166134 inhabitants)
87 Km E of Viterbo (67173 inhabitants)
89 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km N of Tivoli (56533 inhabitants)
93 Km W of Montesilvano (53738 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 2021-11-22
19:20:40		 42.7617 13.0603 11 2021-11-22
19:27:43		 Sala Sismica INGV-Roma 97697611
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-22 19:20:40 ± 0.05
Latitude 42.7617 ± 0.0027
Longitude 13.0603 ± 0.0049
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 97697611

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 383
Semi-minor axis of confidence ellipse (meter) 204
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 280
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
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) 0.08184
Epicentral distance of station farthest from the epicenter (degree) 0.49373
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.4
Num. used stations 22
Type of magnitude ML
Reference to an origin 97697611
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-22 19:27:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-11-22T19:20:55.03 0.3 undecidable manual S 109 46.9197 50 0 71
IV.RM33.EHZ. 2021-11-22T19:20:50.72 0.3 undecidable manual S 156 30.747 50 0.01 73
IV.CESI.HHZ. 2021-11-22T19:20:50.50 0.6 undecidable manual S 335 29.748 50 0.04 49
IV.FDMO.HHZ. 2021-11-22T19:20:50.54 0.3 undecidable manual S 4 30.5472 50 -0.12 71
IV.MMO1.EHZ. 2021-11-22T19:20:49.63 0.3 undecidable manual S 55 26.5512 50 0.05 73
IV.TERO.HHZ. 2021-11-22T19:20:49.20 0.6 undecidable manual P 109 46.9197 50 0.52 43
IV.MNTT.EHZ. 2021-11-22T19:20:49.67 0.1 undecidable manual P 52 54.8007 50 -0.22 90
IV.MC2.EHZ. 2021-11-22T19:20:47.88 0.3 undecidable manual S 32 19.6692 50 0.14 72
IV.FDMO.HHZ. 2021-11-22T19:20:46.07 0.3 positive manual P 4 30.5472 50 -0.09 72
IV.LNSS.HHZ. 2021-11-22T19:20:46.99 0.3 undecidable manual S 185 17.6712 122 -0.22 72
IV.GAVE.EHZ. 2021-11-22T19:20:46.56 0.3 undecidable manual S 240 15.5733 125 -0.03 75
IV.RM33.EHZ. 2021-11-22T19:20:46.03 1.0 negative manual P 156 30.747 50 -0.15 24
IV.CESI.HHZ. 2021-11-22T19:20:46.05 0.3 positive manual P 335 29.748 50 0.01 73
IV.MMO1.EHZ. 2021-11-22T19:20:45.51 0.3 negative manual P 55 26.5512 50 -0.03 74
IV.NRCA.HHZ. 2021-11-22T19:20:44.67 0.6 undecidable manual S 29 9.0798 140 -0.24 49
IV.MC2.EHZ. 2021-11-22T19:20:44.57 0.1 positive manual P 32 19.6692 50 0.1 98
IV.LNSS.HHZ. 2021-11-22T19:20:44.14 0.1 undecidable manual P 185 17.6712 122 -0.02 100
IV.GAVE.EHZ. 2021-11-22T19:20:44.24 0.6 negative manual P 240 15.5733 125 0.44 46
IV.NRCA.HHZ. 2021-11-22T19:20:42.90 0.1 positive manual P 29 9.0798 140 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:1.8 0.0007815 0.14 AML other m 2021-11-22T19:20:44.70
IV.NRCA.HHN. ML:1.8 0.0008354999999999999 0.14 AML other m 2021-11-22T19:20:44.77
IV.NRCA.HNE. ML:1.7 0.0006655028000000001 0.0896 AML other m 2021-11-22T19:20:45.28
IV.NRCA.HHE. ML:1.7 0.0006855 0.08 AML other m 2021-11-22T19:20:45.28
IV.GAVE.EHN. ML:1.2 0.00016166924999999998 0.256 AML other m 2021-11-22T19:20:46.76
IV.LNSS.HHN. ML:1.5 0.000249 0.16 AML other m 2021-11-22T19:20:47.35
IV.LNSS.HHE. ML:1.4 0.00018476 0.1792 AML other m 2021-11-22T19:20:47.80
IV.GAVE.EHE. ML:1.2 0.000135099985 0.1536 AML other m 2021-11-22T19:20:48.27
IV.MMO1.EHN. ML:1.1 0.00007464065000000001 0.1792 AML other m 2021-11-22T19:20:49.69
IV.MMO1.EHE. ML:1.2 0.0000797 1.28 AML other m 2021-11-22T19:20:50.03
IV.TERO.HHE. ML:2.6 0.00101 0.56 AML other m 2021-11-22T19:21:01.01
IV.TERO.HHN. ML:1.2 0.000037699999999999995 0.42 AML other m 2021-11-22T19:21:05.98
IV.LNSS.HNE. ML:1.4 0.0001942968 0.192 AML other m 2021-11-22T19:20:47.71
IV.LNSS.HNN. ML:1.5 0.00024029624999999998 0.1536 AML other m 2021-11-22T19:20:47.35
IV.GAVE.HNE. ML:1.3 0.0001894563 0.4224 AML other m 2021-11-22T19:20:47.60
IV.MC2.EHE. ML:1.0 0.0000815224335 0.2816 AML other m 2021-11-22T19:20:50.64
IV.MC2.EHN. ML:1.2 0.00010444173 0.256 AML other m 2021-11-22T19:20:50.91
IV.MMO1.HNE. ML:2.9 0.004331937500000001 0.5888 AML other m 2021-11-22T19:20:46.44
IV.RM33.EHE. ML:0.8 0.00002881115 0.128 AML other m 2021-11-22T19:20:52.55
IV.RM33.EHN. ML:0.9 0.000036345615 0.1024 AML other m 2021-11-22T19:20:51.48
IV.CESI.HHE. ML:0.9 0.00004225057 0.192 AML other m 2021-11-22T19:20:50.79
IV.CESI.HHN. ML:0.9 0.000041763295 0.1792 AML other m 2021-11-22T19:20:51.39
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