Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.3 on date 23-10-2021 and time 16:40:33 (UTC) in region 7 km SE Norcia (PG)

A magnitude ML 2.3 earthquake occured in region: 7 km SE Norcia (PG), on

  • 23-10-2021 16:40:33 (UTC)
  • 23-10-2021 18:40:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7580, 13.1580 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.

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 7 4957 4957
Accumoli RI 10 667 5624
Arquata del Tronto AP 12 1178 6802
Cascia PG 13 3217 10019
Castelsantangelo sul Nera MC 15 281 10300
Cittareale RI 16 482 10782
Preci PG 17 724 11506
Montegallo AP 17 523 12029
Amatrice RI 18 2657 14686
Poggiodomo PG 19 117 14803

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km SE of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
47 Km E of Terni (111501 inhabitants)
49 Km NW of L'Aquila (69753 inhabitants)
74 Km SE of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km W of Pescara (121014 inhabitants)
93 Km NE of Tivoli (56533 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
94 Km W of Chieti (51815 inhabitants)
100 Km SW of Ancona (100861 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 2.3 2021-10-23
16:40:33		 42.7582 13.1582 10 2022-03-30
13:04:13		 Bollettino Sismico Italiano INGV 96980331
Reviewed
Rev100 		ML 2.3 2021-10-23
16:40:33		 42.7603 13.1633 11 2021-10-23
17:01:49		 Sala Sismica INGV-Roma 96913541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-23 16:40:33 ± 0.04
Latitude 42.7582 ± 0.0027
Longitude 13.1582 ± 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 96980331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 283
Semi-minor axis of confidence ellipse (meter) 175
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 82
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 32
Number of associated phases, regardless of their use for origin computation 69
Number of defining phases 65
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.95058
Number of stations at which the event was observed 44
Number of stations from which data was used for origin computation 40
Magnitudes information

ML:2.3

Field Value
Value 2.3
Uncertainty 0.3
Num. used stations 39
Type of magnitude ML
Reference to an origin 96980331
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-16 16:33:07

ML:2.3

Field Value
Value 2.3
Uncertainty 0.3
Num. used stations 39
Type of magnitude ML
Reference to an origin 96913541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-23 17:01:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IX.SRN3.HHZ.02 2021-10-23T16:42:02.36 3.0 undecidable manual Sg 10.13 0
IV.PAOL.HHZ. 2021-10-23T16:41:35.11 3.0 undecidable manual Sg 3.15 0
OT.OT17.EHZ. 2021-10-23T16:41:32.60 3.0 undecidable manual Sn 2.06 0
IV.CELB.HHZ. 2021-10-23T16:41:08.26 3.0 undecidable manual Pn 0.15 0
IV.MPAG.EHZ. 2021-10-23T16:40:50.82 0.3 undecidable manual P 342 101.8203 50 0.54 57
IV.FIAM.HHZ. 2021-10-23T16:40:50.41 0.6 undecidable manual S 184 54.501 50 0.15 46
IV.NARO.HHZ. 2021-10-23T16:40:50.95 0.3 undecidable manual P 334 105.5166 50 0.11 63
IV.INTR.HHZ. 2021-10-23T16:40:49.88 0.6 undecidable manual P 143 102.9192 50 -0.57 38
IV.MOMA.HHZ. 2021-10-23T16:40:49.19 0.6 undecidable manual S 276 48.1185 50 0.62 41
IV.CESX.HHZ. 2021-10-23T16:40:49.33 0.6 undecidable manual S 251 49.5171 50 0.41 44
IV.FRON.EHZ. 2021-10-23T16:40:49.12 0.3 undecidable manual P 338 91.242 50 0.47 60
IV.ASSB.HHZ. 2021-10-23T16:40:49.61 0.6 undecidable manual S 308 51.4152 50 0.17 46
IV.SAP2.EHZ. 2021-10-23T16:40:47.82 0.6 undecidable manual S 27 42.3243 50 0.8 39
IV.SSFR.HHZ. 2021-10-23T16:40:47.48 0.3 undecidable manual P 338 81.1521 50 0.39 62
IV.ARVD.HHZ. 2021-10-23T16:40:47.54 0.3 undecidable manual P 348 83.9493 50 0.02 67
IV.MML1.EHZ. 2021-10-23T16:40:46.99 0.6 undecidable manual S 339 42.2244 50 0 48
IV.T0110.HHZ. 2021-10-23T16:40:46.64 0.3 undecidable manual P 139 77.4669 50 0.12 66
IV.FOSV.EHZ. 2021-10-23T16:40:45.11 0.3 undecidable manual P 332 67.6767 50 0.09 68
IV.ARRO.EHZ. 2021-10-23T16:40:45.77 0.6 undecidable manual S 238 37.629 50 0 49
IV.VCEL.EHZ. 2021-10-23T16:40:45.42 0.3 undecidable manual P 126 68.7756 50 0.23 66
IV.CSP1.EHZ. 2021-10-23T16:40:45.37 0.3 undecidable manual S 6 37.2294 50 -0.28 69
IV.MF5.EHZ. 2021-10-23T16:40:45.86 0.6 undecidable manual S 44 35.3424 50 0.71 41
IV.GUMA.HHZ. 2021-10-23T16:40:45.84 0.3 undecidable manual S 23 36.741 50 0.32 69
IV.TRTR.HHZ. 2021-10-23T16:40:45.21 0.3 undecidable manual P 85 61.7937 50 1.11 49
IV.TERO.HHZ. 2021-10-23T16:40:45.77 0.6 undecidable manual S 112 39.3273 50 -0.44 44
IV.CESI.HHZ. 2021-10-23T16:40:44.84 0.3 undecidable manual S 323 34.2435 50 -0.03 73
IV.CING.HHZ. 2021-10-23T16:40:44.87 0.3 undecidable manual P 3 68.5758 50 -0.28 65
IV.ATCC.EHZ. 2021-10-23T16:40:44.33 0.3 undecidable manual P 319 63.3921 50 -0.02 70
IV.EL6.EHZ. 2021-10-23T16:40:44.07 0.3 undecidable manual P 356 63.492 50 -0.3 66
IV.RM33.EHZ. 2021-10-23T16:40:43.09 0.3 undecidable manual S 171 28.0497 50 -0.11 73
IT.MTCL.HGZ. 2021-10-23T16:40:43.55 0.3 undecidable manual S 334 29.1486 50 0.05 74
IV.FDMO.HHZ. 2021-10-23T16:40:43.60 0.3 undecidable manual S 349 31.4463 50 -0.5 67
IV.CAMP.HHZ. 2021-10-23T16:40:43.94 0.3 undecidable manual S 140 32.0457 50 -0.33 69
IV.FIAM.HHZ. 2021-10-23T16:40:42.70 0.1 undecidable manual P 184 54.501 50 -0.28 89
IV.ASSB.HHZ. 2021-10-23T16:40:42.16 0.3 undecidable manual P 308 51.4152 50 -0.35 66
IV.MNTT.EHZ. 2021-10-23T16:40:42.81 0.1 undecidable manual P 46 49.0176 50 0.68 80
IV.OFFI.HHZ. 2021-10-23T16:40:42.41 0.3 undecidable manual P 65 47.2194 50 0.56 63
IV.LNSS.HNZ. 2021-10-23T16:40:41.01 0.3 undecidable manual S 209 19.7691 117 0.29 71
IV.GAVE.EHZ. 2021-10-23T16:40:41.76 0.3 undecidable manual S 251 22.755 114 0.1 74
IV.SAP2.EHZ. 2021-10-23T16:40:41.30 0.1 undecidable manual P 27 42.3243 50 0.19 93
IV.MOMA.HHZ. 2021-10-23T16:40:41.93 0.1 undecidable manual P 276 48.1185 50 -0.08 94
IV.CESX.HHZ. 2021-10-23T16:40:41.99 0.1 undecidable manual P 251 49.5171 50 -0.22 91
IV.FEMA.HNZ. 2021-10-23T16:40:41.74 0.3 undecidable manual S 339 24.2535 113 -0.42 69
IV.MF5.EHZ. 2021-10-23T16:40:40.13 0.1 undecidable manual P 44 35.3424 50 0.1 96
IV.MTRA.HNZ. 2021-10-23T16:40:40.28 0.3 undecidable manual S 90 19.3695 117 -0.34 70
IV.GUMA.HHZ. 2021-10-23T16:40:40.33 0.1 undecidable manual P 23 36.741 50 0.09 96
IV.TERO.HHZ. 2021-10-23T16:40:40.21 0.1 undecidable manual P 112 39.3273 50 -0.43 89
IV.T1299.HNZ. 2021-10-23T16:40:40.24 0.3 undecidable manual S 144 17.0718 121 0.33 71
IV.ARRO.EHZ. 2021-10-23T16:40:40.24 0.1 undecidable manual P 238 37.629 50 -0.15 95
IV.MMO1.EHZ. 2021-10-23T16:40:40.73 0.3 undecidable manual S 41 20.868 116 -0.33 70
IV.MML1.EHZ. 2021-10-23T16:40:40.83 0.3 undecidable manual P 339 42.2244 50 -0.26 69
IV.MC2.EHZ. 2021-10-23T16:40:40.05 0.3 undecidable manual S 8 17.1717 120 0.11 74
IV.SMA1.EHZ. 2021-10-23T16:40:40.91 0.3 undecidable manual S 134 20.2686 116 0.04 75
IV.CSP1.EHZ. 2021-10-23T16:40:40.03 0.1 undecidable manual P 6 37.2294 50 -0.29 92
IV.FDMO.HHZ. 2021-10-23T16:40:39.12 0.1 undecidable manual P 349 31.4463 50 -0.3 93
IV.CAMP.HHZ. 2021-10-23T16:40:39.28 0.1 undecidable manual P 140 32.0457 50 -0.24 94
IV.CESI.HHZ. 2021-10-23T16:40:39.63 0.1 undecidable manual P 323 34.2435 50 -0.24 93
IV.FEMA.HNZ. 2021-10-23T16:40:38.22 0.3 undecidable manual P 339 24.2535 113 -0.08 74
IV.RM33.EHZ. 2021-10-23T16:40:38.70 0.1 undecidable manual P 171 28.0497 50 -0.2 95
IV.GAVE.EHZ. 2021-10-23T16:40:38.02 0.1 undecidable manual P 251 22.755 114 0 100
IT.MTCL.HGZ. 2021-10-23T16:40:38.86 0.1 undecidable manual P 334 29.1486 50 -0.22 95
IV.MC2.EHZ. 2021-10-23T16:40:37.09 0.1 undecidable manual P 8 17.1717 120 0.06 100
IV.SMA1.EHZ. 2021-10-23T16:40:37.52 0.1 undecidable manual P 134 20.2686 116 -0.04 100
IV.MTRA.HNZ. 2021-10-23T16:40:37.26 0.1 undecidable manual P 90 19.3695 117 -0.15 98
IV.LNSS.HNZ. 2021-10-23T16:40:37.59 0.1 undecidable manual P 209 19.7691 117 0.12 98
IV.NRCA.HNZ. 2021-10-23T16:40:37.75 0.3 undecidable manual S 337 9.0798 138 0.01 77
IV.T1299.HNZ. 2021-10-23T16:40:37.28 0.1 undecidable manual P 144 17.0718 121 0.28 95
IV.MMO1.EHZ. 2021-10-23T16:40:37.47 0.1 undecidable manual P 41 20.868 116 -0.2 96
IV.NRCA.HNZ. 2021-10-23T16:40:35.94 0.1 undecidable manual P 337 9.0798 138 0.19 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:2.6 0.006312493 0.0512 AML other m 2021-10-23T16:40:37.80
IV.NRCA.HHN. ML:2.7 0.0071600000000000006 0.06 AML other m 2021-10-23T16:40:37.78
IV.NRCA.HNE. ML:2.9 0.011042584999999999 1.8848 AML other m 2021-10-23T16:40:38.04
IV.NRCA.HHE. ML:2.9 0.011982469999999999 1.872 AML other m 2021-10-23T16:40:38.05
IV.MTRA.HNE. ML:2.3 0.0015228429999999999 0.4224 AML other m 2021-10-23T16:40:40.54
IV.MTRA.EHE. ML:2.3 0.0014812275 0.2944 AML other m 2021-10-23T16:40:40.55
IV.MTRA.HNN. ML:2.2 0.00131 0.28 AML other m 2021-10-23T16:40:40.72
IV.MTRA.EHN. ML:2.2 0.0013199999999999998 0.28 AML other m 2021-10-23T16:40:40.72
IV.LNSS.HNE. ML:2.2 0.00113 0.18 AML other m 2021-10-23T16:40:41.44
IV.LNSS.HHN. ML:2.3 0.001465 0.16 AML other m 2021-10-23T16:40:41.89
IV.LNSS.HNN. ML:2.2 0.00133 0.16 AML other m 2021-10-23T16:40:41.97
IV.GAVE.HNE. ML:2.4 0.0018454760000000002 0.128 AML other m 2021-10-23T16:40:42.32
IV.GAVE.EHE. ML:2.5 0.002004225 0.1408 AML other m 2021-10-23T16:40:42.32
IV.GAVE.EHN. ML:2.5 0.00198 0.14 AML other m 2021-10-23T16:40:42.35
IV.GAVE.HNN. ML:2.0 0.0006129999999999999 0.14 AML other m 2021-10-23T16:40:42.28
IV.LNSS.HHE. ML:2.2 0.0012230000000000001 0.1 AML other m 2021-10-23T16:40:42.82
IV.RM33.HNE. ML:2.1 0.0007030000000000001 0.12 AML other m 2021-10-23T16:40:43.56
IV.RM33.EHE. ML:2.1 0.00068083705 0.1152 AML other m 2021-10-23T16:40:43.50
IV.SMA1.EHE. ML:2.1 0.000911 0.38 AML other m 2021-10-23T16:40:44.30
IV.CAMP.HHE. ML:1.3 0.00008554322999999999 0.1536 AML other m 2021-10-23T16:40:44.13
IV.RM33.HNN. ML:2.1 0.00072679195 0.2176 AML other m 2021-10-23T16:40:44.51
IV.RM33.EHN. ML:2.1 0.00071069265 0.2176 AML other m 2021-10-23T16:40:44.52
IV.CESI.HHE. ML:1.8 0.0002356311 0.1024 AML other m 2021-10-23T16:40:45.80
IV.CSP1.EHE. ML:2.4 0.0008932571499999999 0.1664 AML other m 2021-10-23T16:40:46.18
IV.GUMA.HNN. ML:2.4 0.0010956065 0.2944 AML other m 2021-10-23T16:40:46.37
IV.GUMA.HHN. ML:2.6 0.0015224675 0.2176 AML other m 2021-10-23T16:40:46.39
IV.GUMA.HNE. ML:2.5 0.0013361962499999999 0.192 AML other m 2021-10-23T16:40:46.41
IV.MF5.EHE. ML:2.1 0.0005391776500000001 0.192 AML other m 2021-10-23T16:40:46.97
IV.GUMA.HHE. ML:2.6 0.001404555 0.1792 AML other m 2021-10-23T16:40:47.28
IV.CSP1.EHN. ML:2.4 0.0010183399 0.4224 AML other m 2021-10-23T16:40:47.56
IV.CESI.HHN. ML:1.8 0.000288796 0.3584 AML other m 2021-10-23T16:40:47.81
IV.SAP2.EHE. ML:2.2 0.0005717428 0.1664 AML other m 2021-10-23T16:40:48.13
IV.SAP2.EHN. ML:3.0 0.003112976 0.1664 AML other m 2021-10-23T16:40:49.82
IV.MOMA.HNE. ML:2.2 0.0004025062 0.192 AML other m 2021-10-23T16:40:50.25
IV.MOMA.HHE. ML:2.2 0.00041357845000000005 0.1792 AML other m 2021-10-23T16:40:50.25
IV.MOMA.HHN. ML:2.0 0.00026985285 0.1792 AML other m 2021-10-23T16:40:50.61
IV.MOMA.HNN. ML:2.0 0.00025709729999999996 0.1792 AML other m 2021-10-23T16:40:50.61
IV.CESX.HHE. ML:1.9 0.0002113114 0.1408 AML other m 2021-10-23T16:40:50.73
IV.CESX.HHN. ML:1.9 0.00019242205 0.2176 AML other m 2021-10-23T16:40:50.80
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
Waveforms Seismic signals in miniseed + resp format Download