Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 18-04-2023 and time 01:40:22 (Italy) in region 8 km E Norcia (PG)

A magnitude ML 1.4 earthquake occured in region: 8 km E Norcia (PG), on

  • 17-04-2023 23:40:22 (UTC)
  • 18-04-2023 01:40:22 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8210, 13.1820 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.

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 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 15 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 19 2916 17796
Bolognola MC 20 142 17938

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km E of Foligno (57155 inhabitants)
46 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 1.4 2023-04-17
23:40:22		 42.8207 13.1825 9 2024-03-01
17:18:06		 Bollettino Sismico Italiano INGV 117059601
Reviewed
Rev100 		ML 1.5 2023-04-17
23:40:22		 42.8198 13.181 9 2023-04-18
07:00:46		 Sala Sismica INGV-Roma 116480881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-17 23:40:22 ± 0.04
Latitude 42.8207 ± 0.0018
Longitude 13.1825 ± 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 117059601

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 215
Semi-minor axis of confidence ellipse (meter) 212
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 310
Circular confidence region, given by single value of horizontal uncertainty (meter) 210.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 59
Number of associated phases, regardless of their use for origin computation 68
Number of defining phases 60
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) 0.73475
Number of stations at which the event was observed 34
Number of stations from which data was used for origin computation 30
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.4
Num. used stations 38
Type of magnitude ML
Reference to an origin 117059601
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-05-05 16:06:45

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 116480881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-18 07:00:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.T0110.HHE. 2023-04-17T23:40:46.80 1.0 undecidable manual S 143 81.5517 50 -0.23 22
IV.CING.HHZ. 2023-04-17T23:40:42.00 0.6 undecidable manual S 1 61.5939 50 0.32 44
IV.FOSV.HNE. 2023-04-17T23:40:42.52 3.0 undecidable manual S 0.53 0
IV.ATCC.EHN. 2023-04-17T23:40:41.50 0.3 undecidable manual S 313 59.7957 50 0.31 66
IV.CESX.HHE. 2023-04-17T23:40:40.00 0.3 undecidable manual S 244 54.0015 50 0.35 66
IV.SNTG.HNE. 2023-04-17T23:40:39.30 0.3 undecidable manual S 338 52.0035 50 0.17 69
IV.GIGS.HHE. 2023-04-17T23:40:38.80 0.3 undecidable manual S 142 51.7038 50 -0.25 68
IV.ASSB.HHZ. 2023-04-17T23:40:38.30 0.3 undecidable manual S 300 49.1175 50 -0.06 71
IV.MOMA.HNE. 2023-04-17T23:40:38.91 0.3 undecidable manual S 268 49.9167 50 0.35 67
IV.MNTT.EHN. 2023-04-17T23:40:37.20 3.0 undecidable manual S 0.46 0
IV.TERO.HHZ. 2023-04-17T23:40:36.00 0.3 undecidable manual S 122 40.7259 50 -0.12 71
IV.T0110.HHE. 2023-04-17T23:40:36.51 0.1 undecidable manual P 143 81.5517 50 -0.06 89
IV.ARRO.EHZ. 2023-04-17T23:40:36.50 0.3 undecidable manual S 232 43.2234 50 -0.29 68
IV.MML1.EHZ. 2023-04-17T23:40:35.00 0.3 undecidable manual S 332 36.741 50 -0.04 73
IV.SAP2.EHN. 2023-04-17T23:40:35.10 0.6 undecidable manual S 30 35.3424 50 0.43 45
IV.RM33.EHZ. 2023-04-17T23:40:34.50 0.3 undecidable manual S 176 34.6431 50 0 74
IV.CAMP.HHN. 2023-04-17T23:40:34.60 0.3 undecidable manual S 150 36.6411 50 -0.41 67
IV.PF6.EHE. 2023-04-17T23:40:34.10 0.3 undecidable manual S 2 35.2425 50 -0.54 65
IV.ASCOL.EHZ. 2023-04-17T23:40:34.00 3.0 undecidable manual S -0.17 0
IV.ATCC.EHN. 2023-04-17T23:40:33.01 0.1 undecidable manual P 313 59.7957 50 -0.2 90
IV.FOSV.HNE. 2023-04-17T23:40:33.63 3.0 undecidable manual P -0.04 0
IV.MF5.EHZ. 2023-04-17T23:40:33.40 0.6 undecidable manual S 50 29.1486 107 0.53 66
IV.CING.HHZ. 2023-04-17T23:40:33.76 0.1 undecidable manual P 1 61.5939 50 0.28 89
IV.GUMA.HHZ. 2023-04-17T23:40:33.30 0.3 undecidable manual S 25 29.5482 107 0.29 70
IV.CSP1.EHZ. 2023-04-17T23:40:32.90 0.3 undecidable manual S 3 30.1476 106 -0.29 70
IV.MOMA.HNE. 2023-04-17T23:40:32.51 0.1 undecidable manual P 268 49.9167 50 0.83 75
IV.CESX.HHE. 2023-04-17T23:40:32.77 0.1 undecidable manual P 244 54.0015 50 0.46 86
IV.CESI.HHZ. 2023-04-17T23:40:32.90 0.3 undecidable manual S 312 30.4473 106 -0.4 68
IV.LNSS.HHZ. 2023-04-17T23:40:32.10 0.3 undecidable manual S 206 26.751 108 0.02 74
IV.GIGS.HHE. 2023-04-17T23:40:31.70 0.1 undecidable manual P 142 51.7038 50 -0.26 90
IV.SMA1.EHZ. 2023-04-17T23:40:31.10 0.3 undecidable manual S 149 24.4533 110 -0.22 72
IV.GAVE.EHZ. 2023-04-17T23:40:31.90 0.3 undecidable manual S 239 27.4503 108 -0.4 69
IV.ASSB.HHZ. 2023-04-17T23:40:31.55 0.1 undecidable manual P 300 49.1175 50 -0.02 95
IV.FDMO.HHZ. 2023-04-17T23:40:31.20 0.3 undecidable manual S 342 25.1526 109 -0.34 70
IV.SNTG.HNE. 2023-04-17T23:40:31.96 0.1 undecidable manual P 338 52.0035 50 -0.05 94
IV.TERO.HHZ. 2023-04-17T23:40:30.06 0.1 undecidable manual P 122 40.7259 50 -0.21 93
IV.MNTT.EHN. 2023-04-17T23:40:30.59 3.0 undecidable manual P -0.05 0
IV.ARRO.EHZ. 2023-04-17T23:40:30.64 0.1 undecidable manual P 232 43.2234 50 -0.02 96
IT.MTCL.HGE. 2023-04-17T23:40:30.80 0.6 undecidable manual S 322 24.2535 110 -0.47 45
IV.ASCOL.EHZ. 2023-04-17T23:40:29.03 3.0 undecidable manual P -0.13 0
IV.FEMA.HNE. 2023-04-17T23:40:29.56 3.0 undecidable manual S -0.05 0
IV.CAMP.HHN. 2023-04-17T23:40:29.40 0.1 undecidable manual P 150 36.6411 50 -0.24 93
IV.PF6.EHE. 2023-04-17T23:40:29.19 0.1 negative manual P 2 35.2425 50 -0.23 94
IV.MTRA.EHN. 2023-04-17T23:40:29.60 0.3 undecidable manual S 112 18.7701 115 0.1 74
IV.SAP2.EHN. 2023-04-17T23:40:29.02 0.1 undecidable manual P 30 35.3424 50 -0.41 90
IV.MML1.EHZ. 2023-04-17T23:40:29.53 0.1 undecidable manual P 332 36.741 50 -0.12 96
IV.RM33.EHZ. 2023-04-17T23:40:29.32 0.1 undecidable manual P 176 34.6431 50 -0.02 98
IV.CESI.HHZ. 2023-04-17T23:40:28.52 0.1 positive manual P 312 30.4473 106 -0.12 97
IV.LNSS.HHZ. 2023-04-17T23:40:28.11 0.1 undecidable manual P 206 26.751 108 0.17 96
IV.GUMA.HHZ. 2023-04-17T23:40:28.73 0.1 undecidable manual P 25 29.5482 107 0.25 94
IV.CSP1.EHZ. 2023-04-17T23:40:28.45 0.1 undecidable manual P 3 30.1476 106 -0.13 97
IV.MMO1.EHE. 2023-04-17T23:40:28.20 0.3 undecidable manual S 53 14.6742 121 -0.02 76
IV.MF5.EHZ. 2023-04-17T23:40:28.72 0.1 undecidable manual P 50 29.1486 107 0.32 93
IV.GAVE.EHZ. 2023-04-17T23:40:28.24 0.1 positive manual P 239 27.4503 108 0.17 96
IV.FDMO.HHZ. 2023-04-17T23:40:27.57 0.1 positive manual P 342 25.1526 109 -0.06 99
7F.SIB2.EHE. 2023-04-17T23:40:27.40 0.3 undecidable manual S 52 12.5763 125 -0.23 73
IT.MTCL.HGE. 2023-04-17T23:40:27.46 0.1 undecidable manual P 322 24.2535 110 -0.01 100
IV.SMA1.EHZ. 2023-04-17T23:40:27.62 0.1 positive manual P 149 24.4533 110 0.11 98
7F.SIB1.EHE. 2023-04-17T23:40:26.70 0.3 undecidable manual S 41 10.878 129 -0.45 70
IV.FEMA.HNE. 2023-04-17T23:40:26.58 3.0 undecidable manual P 0.05 0
IV.MTRA.EHN. 2023-04-17T23:40:26.78 0.1 undecidable manual P 112 18.7701 115 0.33 95
7F.SIB3.EHZ. 2023-04-17T23:40:26.50 0.3 undecidable manual S 50 9.3795 133 -0.25 73
7F.SIB3.EHZ. 2023-04-17T23:40:25.03 0.1 positive manual P 50 9.3795 133 0.17 99
IV.NRCA.HNZ. 2023-04-17T23:40:25.70 0.3 undecidable manual S 284 5.6943 147 -0.24 74
7F.SIB2.EHE. 2023-04-17T23:40:25.55 0.1 positive manual P 52 12.5763 125 0.18 99
7F.SIB1.EHE. 2023-04-17T23:40:25.39 0.1 positive manual P 41 10.878 129 0.29 97
IV.MMO1.EHE. 2023-04-17T23:40:25.93 0.1 negative manual P 53 14.6742 121 0.22 97
IV.NRCA.HNZ. 2023-04-17T23:40:24.63 0.1 negative manual P 284 5.6943 147 0.23 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:0.0 0.003839088 0.0768 AML other m 2023-04-17T23:40:25.87
IV.NRCA.HNN. ML:0.0 0.0035912935 0.0896 AML other m 2023-04-17T23:40:25.88
IV.NRCA.HHE. ML:0.0 0.002009169 0.064 AML other m 2023-04-17T23:40:25.94
IV.NRCA.HNE. ML:0.0 0.001815519 0.064 AML other m 2023-04-17T23:40:25.91
IV.MMO1.EHE. ML:1.6 0.0004325 0.22 AML other m 2023-04-17T23:40:28.46
IV.MMO1.EHN. ML:0.0 0.000357 0.06 AML other m 2023-04-17T23:40:28.44
IV.CESI.HNN. ML:1.3 0.000095976355 0.5632 AML other m 2023-04-17T23:40:31.15
IV.FDMO.HHE. ML:0.0 0.00006520000000000001 0.3 AML other m 2023-04-17T23:40:32.39
IV.FDMO.HHN. ML:0.0 0.00008219999999999999 0.24 AML other m 2023-04-17T23:40:32.15
IV.MF5.EHE. ML:1.1 0.00006884739500000001 0.72 AML other m 2023-04-17T23:40:32.30
IV.LNSS.HHE. ML:0.0 0.00040500000000000003 0.34 AML other m 2023-04-17T23:40:32.80
IV.LNSS.HNE. ML:0.0 0.00038 0.16 AML other m 2023-04-17T23:40:32.81
IV.LNSS.HHN. ML:0.0 0.0003355 0.24 AML other m 2023-04-17T23:40:32.83
IV.LNSS.HNN. ML:0.0 0.00035350000000000003 0.5 AML other m 2023-04-17T23:40:32.84
IV.GUMA.HNN. ML:1.6 0.0001776385 0.704 AML other m 2023-04-17T23:40:32.60
IV.GAVE.EHN. ML:0.0 0.00022749999999999997 0.12 AML other m 2023-04-17T23:40:33.25
IV.GAVE.HNE. ML:0.0 0.00030036175 0.1408 AML other m 2023-04-17T23:40:33.20
IV.GAVE.EHE. ML:0.0 0.00024 0.14 AML other m 2023-04-17T23:40:33.27
IV.CESI.HHN. ML:0.0 0.0000639 0.2 AML other m 2023-04-17T23:40:33.55
IV.GUMA.HHN. ML:0.0 0.000201 0.6 AML other m 2023-04-17T23:40:33.94
IV.CSP1.EHE. ML:0.0 0.0002945 1.66 AML other m 2023-04-17T23:40:34.83
IV.GUMA.HNE. ML:1.4 0.00013477575 0.1792 AML other m 2023-04-17T23:40:34.50
IV.CSP1.EHN. ML:0.0 0.000365 0.42 AML other m 2023-04-17T23:40:34.55
IV.RM33.EHN. ML:0.0 0.00007685 0.24 AML other m 2023-04-17T23:40:34.76
IV.RM33.EHE. ML:0.0 0.00007290000000000001 0.22 AML other m 2023-04-17T23:40:34.98
IV.CESI.HHE. ML:0.0 0.0000447 1.26 AML other m 2023-04-17T23:40:35.85
IV.GUMA.HHE. ML:0.0 0.000162 0.58 AML other m 2023-04-17T23:40:36.59
IV.TERO.HHN. ML:0.0 0.000042749999999999996 0.32 AML other m 2023-04-17T23:40:36.16
IV.TERO.HHE. ML:0.0 0.0000317 0.12 AML other m 2023-04-17T23:40:36.59
IV.MF5.EHN. ML:1.1 0.00006881875999999999 0.4864 AML other m 2023-04-17T23:40:37.39
IV.SMA1.EHE. ML:0.0 0.00006545435999999998 0.2432 AML other m 2023-04-17T23:40:37.82
IV.SMA1.EHN. ML:0.0 0.00008063746499999999 0.512 AML other m 2023-04-17T23:40:38.34
IV.MML1.EHN. ML:0.9 0.000031733235 0.2688 AML other m 2023-04-17T23:40:35.28
IV.MML1.EHE. ML:0.9 0.000028102715 0.192 AML other m 2023-04-17T23:40:35.58
IV.ARRO.EHE. ML:0.8 0.00002057003 0.2048 AML other m 2023-04-17T23:40:37.68
IV.ARRO.EHN. ML:0.9 0.000022731585 0.192 AML other m 2023-04-17T23:40:40.68
IV.ASSB.HHE. ML:0.8 0.000016611109999999998 0.1664 AML other m 2023-04-17T23:40:39.01
IV.ASSB.HHN. ML:0.8 0.0000162416155 0.1664 AML other m 2023-04-17T23:40:42.50
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