Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 04-09-2021 and time 20:56:57 (Italy) in region 8 km E Norcia (PG)

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

  • 04-09-2021 18:56:57 (UTC)
  • 04-09-2021 20:56:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7860, 13.1870 at 8 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
Arquata del Tronto AP 9 1178 6135
Accumoli RI 11 667 6802
Castelsantangelo sul Nera MC 13 281 7083
Montegallo AP 14 523 7606
Cascia PG 16 3217 10823
Preci PG 16 724 11547
Montemonaco AP 17 604 12151
Ussita MC 18 444 12595
Visso MC 18 1107 13702
Acquasanta Terme AP 18 2916 16618
Cittareale RI 19 482 17100
Amatrice RI 19 2657 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Foligno (57155 inhabitants)
45 Km W of Teramo (54892 inhabitants)
51 Km NE of Terni (111501 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
74 Km E of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
94 Km NW of Chieti (51815 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km S of Ancona (100861 inhabitants)
97 Km NE of Tivoli (56533 inhabitants)
98 Km E of Viterbo (67173 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 2021-09-04
18:56:57		 42.7857 13.1868 8 2022-03-30
13:04:06		 Bollettino Sismico Italiano INGV 95539211
Reviewed
Rev100 		ML 1.5 2021-09-04
18:56:57		 42.7833 13.1887 9 2021-09-04
19:04:19		 Sala Sismica INGV-Roma 95041991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-04 18:56:57 ± 0.05
Latitude 42.7857 ± 0.0027
Longitude 13.1868 ± 0.0049
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95539211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 341
Semi-minor axis of confidence ellipse (meter) 210
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 243
Circular confidence region, given by single value of horizontal uncertainty (meter) 340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 36
Number of associated phases, regardless of their use for origin computation 46
Number of defining phases 46
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) 0.07195
Epicentral distance of station farthest from the epicenter (degree) 0.59625
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 38
Type of magnitude ML
Reference to an origin 95539211
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-04 13:34:30

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 95041991
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-04 19:04:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CING.HHZ. 2021-09-04T18:57:19.04 0.6 undecidable manual S 1 65.49 50 0.87 36
IV.ATCC.EHZ. 2021-09-04T18:57:18.14 0.6 undecidable manual S 315 62.6928 50 0.7 39
IV.EL6.EHZ. 2021-09-04T18:57:17.45 0.6 undecidable manual S 353 60.6948 50 0.55 41
IV.MOMA.HHZ. 2021-09-04T18:57:14.57 0.6 undecidable manual S 273 50.2164 50 0.46 43
IV.ASSB.HHZ. 2021-09-04T18:57:14.34 0.6 undecidable manual S 304 51.5151 50 -0.1 46
IV.MML1.EHZ. 2021-09-04T18:57:11.48 0.6 undecidable manual S 334 40.3263 50 0.01 48
IV.TERO.HHZ. 2021-09-04T18:57:10.38 0.6 undecidable manual S 118 38.5281 50 -0.59 42
IV.FAGN.HHZ. 2021-09-04T18:57:10.00 0.3 undecidable manual P 151 66.1893 50 0.44 63
IV.CESI.HHZ. 2021-09-04T18:57:09.28 0.6 undecidable manual S 317 33.4443 103 -0.18 47
IV.CING.HHZ. 2021-09-04T18:57:09.40 0.1 undecidable manual P 1 65.49 50 -0.05 91
IV.CSP1.EHZ. 2021-09-04T18:57:09.28 0.6 undecidable manual S 2 34.0437 103 -0.37 45
IV.GUMA.HHZ. 2021-09-04T18:57:09.49 0.6 undecidable manual S 21 33.0447 103 0.17 47
IV.FDMO.HHZ. 2021-09-04T18:57:08.04 0.6 undecidable manual S 344 28.9488 105 0.08 48
IV.ATCC.EHZ. 2021-09-04T18:57:08.85 0.1 undecidable manual P 315 62.6928 50 -0.18 89
IV.EL6.EHZ. 2021-09-04T18:57:08.69 0.1 undecidable manual P 353 60.6948 50 -0.03 92
IV.RM33.EHZ. 2021-09-04T18:57:08.42 0.6 undecidable manual S 176 30.747 104 -0.14 48
IT.MTCL.HGZ. 2021-09-04T18:57:07.07 0.6 undecidable manual S 327 27.6501 106 -0.46 45
IV.MOMA.HHZ. 2021-09-04T18:57:07.08 0.1 undecidable manual P 273 50.2164 50 -0.03 94
IV.GAVE.EHZ. 2021-09-04T18:57:07.16 0.6 undecidable manual S 247 26.0517 107 0.18 48
IV.OFFI.HHZ. 2021-09-04T18:57:06.61 0.1 undecidable manual P 68 43.8228 50 0.5 86
IV.LNSS.HHZ. 2021-09-04T18:57:06.34 0.6 undecidable manual S 211 23.5542 109 0.19 48
IV.FEMA.HNZ. 2021-09-04T18:57:06.11 0.3 undecidable manual S 330 22.5552 109 0.28 70
IV.ASSB.HHZ. 2021-09-04T18:57:06.89 0.3 undecidable manual P 304 51.5151 50 -0.41 65
IV.SMA1.EHZ. 2021-09-04T18:57:05.02 0.6 undecidable manual S 145 21.0678 111 -0.32 47
IV.T1299.HNZ. 2021-09-04T18:57:05.29 0.6 undecidable manual S 155 18.4704 113 0.76 41
IV.MML1.EHZ. 2021-09-04T18:57:05.25 0.1 undecidable manual P 334 40.3263 50 -0.33 90
IV.CESI.HHZ. 2021-09-04T18:57:04.21 0.1 undecidable manual P 317 33.4443 103 -0.21 94
IV.TERO.HHZ. 2021-09-04T18:57:04.68 0.1 undecidable manual P 118 38.5281 50 -0.62 83
IV.CSP1.EHZ. 2021-09-04T18:57:04.11 0.1 undecidable manual P 2 34.0437 103 -0.42 89
IV.GUMA.HHZ. 2021-09-04T18:57:04.32 0.1 positive manual P 21 33.0447 103 -0.02 97
IV.MTRA.EHZ. 2021-09-04T18:57:04.32 0.6 undecidable manual S 101 17.3715 115 0.16 49
IV.MMO1.EHZ. 2021-09-04T18:57:03.94 0.6 undecidable manual S 42 16.9719 115 -0.1 49
IV.FDMO.HHZ. 2021-09-04T18:57:03.31 0.1 undecidable manual P 344 28.9488 105 -0.25 94
IT.MTCL.HGZ. 2021-09-04T18:57:03.06 0.3 undecidable manual P 327 27.6501 106 -0.24 70
IV.MC2.EHZ. 2021-09-04T18:57:03.79 0.6 undecidable manual S 1 13.9749 120 0.68 42
IV.RM33.EHZ. 2021-09-04T18:57:03.64 0.1 undecidable manual P 176 30.747 104 -0.26 93
IV.SMA1.EHZ. 2021-09-04T18:57:02.07 0.1 negative manual P 145 21.0678 111 0.03 99
IV.FEMA.HNZ. 2021-09-04T18:57:02.80 0.3 undecidable manual P 330 22.5552 109 0.47 68
IV.GAVE.EHZ. 2021-09-04T18:57:02.96 0.1 undecidable manual P 247 26.0517 107 -0.02 99
IV.LNSS.HHZ. 2021-09-04T18:57:02.55 0.3 undecidable manual P 211 23.5542 109 0.03 74
IV.MTRA.EHZ. 2021-09-04T18:57:01.39 0.1 undecidable manual P 101 17.3715 115 0.03 100
IV.T1299.HNZ. 2021-09-04T18:57:01.89 0.1 undecidable manual P 155 18.4704 113 0.32 94
IV.MMO1.EHZ. 2021-09-04T18:57:01.26 0.1 undecidable manual P 42 16.9719 115 -0.04 100
IV.NRCA.HNZ. 2021-09-04T18:57:01.24 0.6 undecidable manual S 312 7.9809 135 -0.19 49
IV.MC2.EHZ. 2021-09-04T18:57:00.92 0.1 positive manual P 1 13.9749 120 0.17 98
IV.NRCA.HNZ. 2021-09-04T18:56:59.89 0.1 undecidable manual P 312 7.9809 135 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:1.9 0.001325197 0.1024 AML other m 2021-09-04T18:57:01.36
IV.NRCA.HHN. ML:2.0 0.0016126704999999998 0.128 AML other m 2021-09-04T18:57:01.34
IV.NRCA.HHE. ML:2.3 0.0033821884999999997 0.1408 AML other m 2021-09-04T18:57:01.52
IV.NRCA.HNE. ML:2.3 0.003096064 0.128 AML other m 2021-09-04T18:57:01.52
IV.MTRA.HNE. ML:1.4 0.00020434585 0.384 AML other m 2021-09-04T18:57:04.35
IV.MTRA.EHE. ML:1.4 0.00020384595 0.32 AML other m 2021-09-04T18:57:04.51
IV.MTRA.EHN. ML:1.6 0.00039003875 0.256 AML other m 2021-09-04T18:57:04.86
IV.MTRA.HNN. ML:1.7 0.0004215 0.3 AML other m 2021-09-04T18:57:04.88
IV.SMA1.EHE. ML:1.3 0.000136627765 0.5248 AML other m 2021-09-04T18:57:05.80
IV.SMA1.EHN. ML:1.4 0.00017746865 0.192 AML other m 2021-09-04T18:57:05.54
IV.LNSS.HHN. ML:1.2 0.000105381195 0.128 AML other m 2021-09-04T18:57:07.19
IV.GAVE.HNE. ML:1.4 0.0001494419 0.32 AML other m 2021-09-04T18:57:07.56
IV.GAVE.EHN. ML:1.3 0.00012652685000000003 0.0768 AML other m 2021-09-04T18:57:07.60
IV.GAVE.EHE. ML:1.2 0.000098668225 0.1152 AML other m 2021-09-04T18:57:07.56
IV.FDMO.HHN. ML:1.1 0.000059491295 0.32 AML other m 2021-09-04T18:57:08.48
IV.FDMO.HHE. ML:1.0 0.000052239190000000006 0.2176 AML other m 2021-09-04T18:57:08.47
IV.RM33.HNN. ML:1.5 0.0001448687 0.256 AML other m 2021-09-04T18:57:08.90
IV.RM33.EHN. ML:1.5 0.00014862884999999998 0.2304 AML other m 2021-09-04T18:57:08.79
IV.RM33.HNE. ML:1.6 0.0001913156 0.256 AML other m 2021-09-04T18:57:09.12
IV.RM33.EHE. ML:1.5 0.00014954320999999998 0.1408 AML other m 2021-09-04T18:57:09.13
IV.CSP1.EHN. ML:1.7 0.00021552369999999998 0.576 AML other m 2021-09-04T18:57:09.75
IV.CESI.HHN. ML:1.2 0.00006365128000000001 0.2176 AML other m 2021-09-04T18:57:09.58
IV.CESI.HHE. ML:1.0 0.000042972675 0.1792 AML other m 2021-09-04T18:57:09.51
IV.GUMA.HNN. ML:1.8 0.00026488829999999996 0.3072 AML other m 2021-09-04T18:57:09.96
IV.GUMA.HHN. ML:1.6 0.0001707058 0.1152 AML other m 2021-09-04T18:57:09.82
IV.CSP1.EHE. ML:2.0 0.0003962988 0.2048 AML other m 2021-09-04T18:57:09.77
IV.GUMA.HHE. ML:1.7 0.00019912995 0.1536 AML other m 2021-09-04T18:57:09.96
IV.GUMA.HNE. ML:1.8 0.00027221410000000004 0.1792 AML other m 2021-09-04T18:57:10.24
IV.TERO.HHN. ML:1.6 0.00013000000000000002 0.1 AML other m 2021-09-04T18:57:10.73
IV.MML1.EHE. ML:0.9 0.000029282795 0.2304 AML other m 2021-09-04T18:57:12.03
IV.ASSB.HHN. ML:0.9 0.00001818379 0.4224 AML other m 2021-09-04T18:57:14.64
IV.ASSB.HHE. ML:1.1 0.00003124381 0.1792 AML other m 2021-09-04T18:57:14.84
IV.MOMA.HHN. ML:0.9 0.00002027315 0.1664 AML other m 2021-09-04T18:57:15.12
IV.MOMA.HHE. ML:1.2 0.00003937725 0.128 AML other m 2021-09-04T18:57:15.22
IV.ATCC.EHE. ML:0.9 0.00001442854 0.1024 AML other m 2021-09-04T18:57:18.27
IV.ATCC.EHN. ML:1.1 0.00002354463 0.3712 AML other m 2021-09-04T18:57:18.48
IV.CING.HHE. ML:1.0 0.000019213979999999998 0.4224 AML other m 2021-09-04T18:57:19.62
IV.CING.HHN. ML:1.3 0.00003725 0.46 AML other m 2021-09-04T18:57:20.70
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