Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 08-04-2023 and time 12:40:31 (Italy) in region 8 km E Norcia (PG)

A magnitude ML 1.6 earthquake occured in region: 8 km E Norcia (PG), on

  • 08-04-2023 10:40:31 (UTC)
  • 08-04-2023 12:40:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8210, 13.1800 at 9 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 8 4957 4957
Castelsantangelo sul Nera MC 9 281 5238
Arquata del Tronto AP 11 1178 6416
Montegallo AP 13 523 6939
Preci PG 13 724 7663
Ussita MC 14 444 8107
Visso MC 14 1107 9214
Montemonaco AP 15 604 9818
Accumoli RI 15 667 10485
Cascia PG 18 3217 13702
Montefortino FM 19 1178 14880
Acquasanta Terme AP 20 2916 17796
Bolognola MC 20 142 17938

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km E of Foligno (57155 inhabitants)
47 Km W of Teramo (54892 inhabitants)
52 Km NE of Terni (111501 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
72 Km E of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
93 Km W of Pescara (121014 inhabitants)
96 Km NW of Chieti (51815 inhabitants)
99 Km NE of Guidonia Montecelio (88673 inhabitants)
99 Km E of Viterbo (67173 inhabitants)
100 Km NE of Tivoli (56533 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 2023-04-08
10:40:31		 42.8213 13.18 9 2024-03-01
17:18:11		 Bollettino Sismico Italiano INGV 118339871
Reviewed
Rev100 		ML 1.7 2023-04-08
10:40:32		 42.8287 13.175 8 2023-04-08
10:53:54		 Sala Sismica INGV-Roma 116169681
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-08 10:40:31 ± 0.04
Latitude 42.8213 ± 0.0027
Longitude 13.1800 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 118339871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 301
Semi-minor axis of confidence ellipse (meter) 156
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 61
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 58
Number of associated phases, regardless of their use for origin computation 54
Number of defining phases 51
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.53690
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 27
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 49
Type of magnitude ML
Reference to an origin 118339871
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-06-12 13:52:28

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 116169681
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-08 10:53:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.IMOL.HNZ. 2023-04-08T10:41:14.16 3.0 undecidable manual Sn -0.08 0
IV.RMP.HHZ. 2023-04-08T10:41:06.84 3.0 undecidable manual Sg 1.26 0
IV.ATCC.EHZ. 2023-04-08T10:40:51.50 0.3 undecidable manual S 313 59.5959 50 0.64 60
IV.EL6.EHZ. 2023-04-08T10:40:50.50 0.3 undecidable manual S 354 56.6988 50 0.4 65
IV.SNTG.HHZ. 2023-04-08T10:40:49.10 0.3 undecidable manual S 338 51.9036 50 0.29 67
IV.GIGS.HHZ. 2023-04-08T10:40:48.70 0.3 undecidable manual S 142 51.9036 50 -0.13 69
IV.ASSB.HHZ. 2023-04-08T10:40:48.10 0.3 undecidable manual S 300 48.9177 50 0.07 70
IV.TERO.HHZ. 2023-04-08T10:40:45.60 0.3 undecidable manual S 122 40.9257 50 -0.3 68
IV.SAP2.EHZ. 2023-04-08T10:40:45.20 0.1 undecidable manual S 30 35.3424 50 0.8 78
IV.RM33.EHZ. 2023-04-08T10:40:44.10 0.1 undecidable manual S 175 34.743 50 -0.15 94
IV.CAMP.HHZ. 2023-04-08T10:40:44.50 0.3 undecidable manual S 149 36.741 50 -0.28 69
IV.MML1.EHZ. 2023-04-08T10:40:44.50 0.3 undecidable manual S 333 36.5412 50 -0.22 70
IV.PF6.EHZ. 2023-04-08T10:40:44.00 0.1 undecidable manual S 2 35.1426 50 -0.34 91
IV.CING.HHZ. 2023-04-08T10:40:43.49 3.0 undecidable manual P 0.24 0
IV.GUMA.HHZ. 2023-04-08T10:40:43.00 0.3 undecidable manual S 25 29.5482 106 0.31 69
IV.EL6.EHZ. 2023-04-08T10:40:42.32 0.3 undecidable manual P 354 56.6988 50 -0.12 68
IV.CESI.HHZ. 2023-04-08T10:40:42.80 0.3 undecidable manual S 312 30.2475 106 -0.11 72
IV.CSP1.EHZ. 2023-04-08T10:40:42.50 0.3 undecidable manual S 4 30.0477 106 -0.35 68
IV.ATCC.EHZ. 2023-04-08T10:40:42.96 0.3 undecidable manual P 313 59.5959 50 0.08 69
IV.LNSS.HHZ. 2023-04-08T10:40:42.00 0.3 undecidable manual S 205 26.751 108 0.24 70
IV.GIGS.HHZ. 2023-04-08T10:40:41.53 0.3 undecidable manual P 142 51.9036 50 -0.18 68
IV.MOMA.HHZ. 2023-04-08T10:40:41.62 0.6 undecidable manual P 268 49.7169 50 0.26 45
IV.SNTG.HHZ. 2023-04-08T10:40:41.54 0.3 undecidable manual P 338 51.9036 50 -0.16 69
IV.FDMO.HHZ. 2023-04-08T10:40:40.90 0.3 undecidable manual S 343 25.0527 109 -0.28 70
IT.MTCL.HGZ. 2023-04-08T10:40:40.60 0.3 undecidable manual S 323 24.1536 110 -0.28 70
IV.ASSB.HHZ. 2023-04-08T10:40:40.99 0.3 undecidable manual P 300 48.9177 50 -0.26 67
IV.SAP2.EHZ. 2023-04-08T10:40:39.60 0.3 undecidable manual P 30 35.3424 50 0.45 66
IV.MML1.EHZ. 2023-04-08T10:40:39.10 0.1 positive manual P 333 36.5412 50 -0.24 92
IV.TERO.HHZ. 2023-04-08T10:40:39.83 0.3 undecidable manual P 122 40.9257 50 -0.19 69
IV.FEMA.HNZ. 2023-04-08T10:40:39.20 0.3 undecidable manual S 326 18.87 115 0.01 75
IV.CAMP.HHZ. 2023-04-08T10:40:39.07 0.3 undecidable manual P 149 36.741 50 -0.3 68
IV.MTRA.EHE. 2023-04-08T10:40:39.30 0.6 undecidable manual S 112 19.0698 115 0.05 49
IV.CSP1.EHZ. 2023-04-08T10:40:38.07 0.1 positive manual P 4 30.0477 106 -0.19 94
IV.GAVE.EHN. 2023-04-08T10:40:38.06 0.3 undecidable manual P 238 27.3504 108 0.33 69
IV.GUMA.HHZ. 2023-04-08T10:40:38.36 0.1 undecidable manual P 25 29.5482 106 0.19 94
IV.PF6.EHZ. 2023-04-08T10:40:38.80 0.1 undecidable manual P 2 35.1426 50 -0.32 91
IV.CESI.HHZ. 2023-04-08T10:40:38.16 0.1 undecidable manual P 312 30.2475 106 -0.13 96
IV.RM33.EHZ. 2023-04-08T10:40:38.95 0.1 positive manual P 175 34.743 50 -0.12 95
7F.SIB2.EHZ. 2023-04-08T10:40:37.00 0.3 undecidable manual S 52 12.6762 124 -0.33 71
IV.FDMO.HHZ. 2023-04-08T10:40:37.19 0.1 undecidable manual P 343 25.0527 109 -0.1 97
IV.LNSS.HHZ. 2023-04-08T10:40:37.88 0.1 negative manual P 205 26.751 108 0.25 94
7F.SIB1.EHZ. 2023-04-08T10:40:37.00 0.3 undecidable manual S 42 10.9779 129 0.16 74
IT.MTCL.HGZ. 2023-04-08T10:40:37.05 0.1 undecidable manual P 323 24.1536 110 -0.07 98
IV.MMO1.EHZ. 2023-04-08T10:40:37.80 0.3 undecidable manual S 54 14.7741 121 -0.13 74
IV.SMA1.EHZ. 2023-04-08T10:40:37.25 0.1 undecidable manual P 149 24.6531 109 0.02 99
IV.FEMA.HNZ. 2023-04-08T10:40:36.32 0.1 undecidable manual P 326 18.87 115 0.17 97
7F.SIB3.EHZ. 2023-04-08T10:40:36.00 0.3 undecidable manual S 51 9.4794 133 -0.44 70
IV.MTRA.EHE. 2023-04-08T10:40:36.70 0.1 undecidable manual P 112 19.0698 115 0.52 89
7F.SIB2.EHZ. 2023-04-08T10:40:35.16 0.1 positive manual P 52 12.6762 124 0.09 99
IV.NRCA.HHZ. 2023-04-08T10:40:35.30 0.3 undecidable manual S 284 5.4945 148 -0.26 73
7F.SIB1.EHZ. 2023-04-08T10:40:35.02 0.1 positive manual P 42 10.9779 129 0.23 97
IV.MMO1.EHZ. 2023-04-08T10:40:35.59 0.1 undecidable manual P 54 14.7741 121 0.17 97
IV.NRCA.HHZ. 2023-04-08T10:40:34.24 0.1 negative manual P 284 5.4945 148 0.19 99
7F.SIB3.EHZ. 2023-04-08T10:40:34.64 0.1 positive manual P 51 9.4794 133 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:0.0 0.010355588 0.0832 AML other m 2023-04-08T10:40:35.47
IV.NRCA.HNN. ML:0.0 0.009571401 0.1408 AML other m 2023-04-08T10:40:35.46
IV.NRCA.HNE. ML:0.0 0.0050902945 0.0704 AML other m 2023-04-08T10:40:35.50
IV.NRCA.HHE. ML:0.0 0.005614753 0.064 AML other m 2023-04-08T10:40:35.50
IV.MMO1.EHE. ML:0.0 0.00068532165 0.0768 AML other m 2023-04-08T10:40:38.07
IV.MMO1.EHN. ML:0.0 0.0006535 1.32 AML other m 2023-04-08T10:40:38.06
IV.FDMO.HHN. ML:0.0 0.00020695620000000002 0.1792 AML other m 2023-04-08T10:40:41.77
IV.FDMO.HHE. ML:0.0 0.0001339365 0.3008 AML other m 2023-04-08T10:40:41.00
IV.LNSS.HHE. ML:0.0 0.0010050332499999999 0.1408 AML other m 2023-04-08T10:40:42.43
IV.LNSS.HHN. ML:0.0 0.0007204508499999999 0.224 AML other m 2023-04-08T10:40:42.44
IV.CESI.HHN. ML:0.0 0.00026458979999999997 0.1984 AML other m 2023-04-08T10:40:43.16
IV.CESI.HHE. ML:0.0 0.00010366359 0.1792 AML other m 2023-04-08T10:40:43.16
IV.CSP1.EHE. ML:0.0 0.0008731270999999999 0.32 AML other m 2023-04-08T10:40:43.45
IV.CSP1.EHN. ML:0.0 0.00099425725 0.3584 AML other m 2023-04-08T10:40:44.35
IV.RM33.EHN. ML:0.0 0.0001660684 0.2624 AML other m 2023-04-08T10:40:44.51
IV.RM33.EHE. ML:0.0 0.00012724824000000002 0.256 AML other m 2023-04-08T10:40:44.61
IV.SMA1.EHE. ML:1.4 0.00016 0.34 AML other m 2023-04-08T10:40:46.78
IV.MML1.EHE. ML:0.0 0.00008063575500000001 0.1984 AML other m 2023-04-08T10:40:46.59
IV.MML1.EHN. ML:0.0 0.00008584254499999999 0.2624 AML other m 2023-04-08T10:40:44.89
IV.SMA1.EHN. ML:1.6 0.00023349999999999998 0.5 AML other m 2023-04-08T10:40:47.96
IV.ASSB.HHN. ML:0.0 0.00004187093 0.1792 AML other m 2023-04-08T10:40:52.13
IV.ASSB.HHE. ML:0.0 0.000042811455 0.16 AML other m 2023-04-08T10:40:48.47
IV.SNTG.HHE. ML:0.0 0.00004948781 0.1344 AML other m 2023-04-08T10:40:49.56
IV.SNTG.HHN. ML:0.0 0.0000637 0.1 AML other m 2023-04-08T10:40:49.97
IV.MMO1.HNE. ML:2.3 0.0021139578 0.8 AML other m 2023-04-08T10:40:37.72
IV.MMO1.HNN. ML:2.7 0.0046261385 0.512 AML other m 2023-04-08T10:40:37.97
IV.LNSS.HNE. ML:2.2 0.0009833083000000001 0.1536 AML other m 2023-04-08T10:40:42.43
IV.LNSS.HNN. ML:2.1 0.00070118695 0.1984 AML other m 2023-04-08T10:40:42.55
IV.CESI.HNE. ML:1.3 0.00010414369999999999 0.2496 AML other m 2023-04-08T10:40:44.37
IV.CESI.HNN. ML:1.7 0.0002578584 0.192 AML other m 2023-04-08T10:40:43.16
IV.RM33.HNE. ML:1.7 0.0001965875 0.2496 AML other m 2023-04-08T10:40:44.73
IV.RM33.HNN. ML:1.6 0.00017593674999999998 0.1472 AML other m 2023-04-08T10:40:45.14
IV.CAMP.HHN. ML:1.0 0.0000401224 0.2176 AML other m 2023-04-08T10:40:44.81
IV.CAMP.HHE. ML:1.2 0.000055367175000000006 0.1984 AML other m 2023-04-08T10:40:44.78
IV.MML1.HNE. ML:1.5 0.000125529265 0.6016 AML other m 2023-04-08T10:40:52.88
IV.MML1.HNN. ML:1.3 0.0000859664 1.0048 AML other m 2023-04-08T10:40:38.71
IV.TERO.HHE. ML:1.6 0.0001229577 0.5376 AML other m 2023-04-08T10:40:47.68
IV.TERO.HNE. ML:1.5 0.00010789390500000001 0.4288 AML other m 2023-04-08T10:40:45.58
IV.TERO.HNN. ML:1.7 0.00016090718 1.0048 AML other m 2023-04-08T10:40:45.79
IV.TERO.HHN. ML:1.4 0.00008832338 0.1408 AML other m 2023-04-08T10:40:45.78
IV.GIGS.HHE. ML:0.6 0.000011329534 1.0432 AML other m 2023-04-08T10:41:02.58
IV.GIGS.HHN. ML:0.6 0.000010373378999999999 0.1984 AML other m 2023-04-08T10:40:49.87
IV.SNTG.HNN. ML:1.4 0.00007114999600000001 0.6272 AML other m 2023-04-08T10:40:49.50
IV.SNTG.HNE. ML:1.3 0.00005080430499999999 1.12 AML other m 2023-04-08T10:40:49.56
IV.EL6.EHE. ML:1.7 0.00010398647 0.1536 AML other m 2023-04-08T10:40:52.95
IV.EL6.EHN. ML:1.8 0.0001298327 0.1984 AML other m 2023-04-08T10:40:52.59
IV.ATCC.HNE. ML:2.7 0.001114398 1.1584 AML other m 2023-04-08T10:40:51.28
IV.ATCC.EHE. ML:1.2 0.0000371160345 0.2176 AML other m 2023-04-08T10:40:53.60
IV.ATCC.EHN. ML:1.2 0.00003734525 0.1408 AML other m 2023-04-08T10:40:52.79
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