Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 18-08-2021 and time 21:52:07 (Italy) in region 3 km E Norcia (PG)

A magnitude ML 1.8 earthquake occured in region: 3 km E Norcia (PG), on

  • 18-08-2021 19:52:07 (UTC)
  • 18-08-2021 21:52:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8000, 13.1280 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.

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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 3 4957 4957
Castelsantangelo sul Nera MC 11 281 5238
Preci PG 11 724 5962
Cascia PG 13 3217 9179
Arquata del Tronto AP 14 1178 10357
Visso MC 15 1107 11464
Accumoli RI 15 667 12131
Ussita MC 16 444 12575
Cerreto di Spoleto PG 17 1075 13650
Montegallo AP 18 523 14173
Poggiodomo PG 19 117 14290
Sellano PG 19 1079 15369
Montemonaco AP 20 604 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
69 Km SE of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
96 Km W of Pescara (121014 inhabitants)
97 Km N of Tivoli (56533 inhabitants)
99 Km NW of Chieti (51815 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 1.8 2021-08-18
19:52:07		 42.8003 13.128 10 2021-12-29
11:12:27		 Bollettino Sismico Italiano INGV 95158791
Reviewed
Rev100 		ML 1.7 2021-08-18
19:52:07		 42.8048 13.1295 10 2021-08-18
19:59:18		 Sala Sismica INGV-Roma 94344061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-18 19:52:07 ± 0.04
Latitude 42.8003 ± 0.0018
Longitude 13.1280 ± 0.0025
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 95158791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 233
Semi-minor axis of confidence ellipse (meter) 132
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 85
Circular confidence region, given by single value of horizontal uncertainty (meter) 230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 34
Number of associated phases, regardless of their use for origin computation 67
Number of defining phases 67
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.03507
Epicentral distance of station farthest from the epicenter (degree) 0.71046
Number of stations at which the event was observed 37
Number of stations from which data was used for origin computation 37
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 48
Type of magnitude ML
Reference to an origin 95158791
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-10 14:27:46

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 34
Type of magnitude ML
Reference to an origin 94344061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-18 19:59:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2021-08-18T19:52:31.48 0.3 undecidable manual S 349 78.8655 50 0.24 65
IV.MURB.HHZ. 2021-08-18T19:52:29.22 0.6 undecidable manual S 317 70.8735 50 0.1 45
IV.CING.HHZ. 2021-08-18T19:52:27.44 0.3 undecidable manual S 5 64.0914 50 0.15 68
IV.EL6.EHZ. 2021-08-18T19:52:26.21 0.3 undecidable manual S 358 58.6968 50 0.35 66
IV.ATCC.EHZ. 2021-08-18T19:52:26.15 0.3 undecidable manual S 317 58.1973 50 0.42 65
IV.FIAM.HHZ. 2021-08-18T19:52:25.76 0.3 undecidable manual S 181 59.0964 50 -0.19 68
IV.MOMA.HHZ. 2021-08-18T19:52:22.72 0.3 undecidable manual S 271 45.4212 50 0.41 66
IV.ASSB.HHZ. 2021-08-18T19:52:22.52 0.3 undecidable manual S 305 46.62 50 -0.12 71
IV.ARVD.HHZ. 2021-08-18T19:52:21.08 0.3 undecidable manual P 349 78.8655 50 -0.12 66
IV.SAP2.EHZ. 2021-08-18T19:52:21.10 0.3 undecidable manual S 34 39.5271 50 0.35 68
IV.TERO.HHZ. 2021-08-18T19:52:21.58 0.3 undecidable manual S 117 43.5231 50 -0.22 69
IV.ARRO.EHZ. 2021-08-18T19:52:20.32 0.3 undecidable manual S 230 38.4282 50 -0.12 72
IV.MURB.HHZ. 2021-08-18T19:52:20.52 0.3 undecidable manual P 317 70.8735 50 0.55 61
IV.PP3.EHZ. 2021-08-18T19:52:20.16 0.3 undecidable manual P 31 74.9694 50 -0.45 62
IV.VCEL.EHZ. 2021-08-18T19:52:20.45 0.6 undecidable manual P 127 73.5708 50 0.07 45
IV.MML1.EHZ. 2021-08-18T19:52:19.90 0.3 undecidable manual S 340 37.0296 50 -0.16 71
IV.PF6.EHZ. 2021-08-18T19:52:19.91 0.3 undecidable manual S 8 37.8288 50 -0.38 68
IV.RM33.EHZ. 2021-08-18T19:52:19.00 0.3 undecidable manual S 168 33.0447 50 -0.02 74
IV.GUMA.HHZ. 2021-08-18T19:52:19.44 0.3 undecidable manual S 30 33.6441 50 0.27 70
IV.CAMP.HHZ. 2021-08-18T19:52:19.91 0.3 undecidable manual S 142 37.2294 50 -0.22 70
IV.MF5.EHZ. 2021-08-18T19:52:19.63 0.3 undecidable manual S 52 34.0437 50 0.35 69
IV.CSP1.EHZ. 2021-08-18T19:52:18.71 0.3 undecidable manual S 11 32.9448 50 -0.27 70
IV.CING.HHZ. 2021-08-18T19:52:18.84 0.3 undecidable manual P 5 64.0914 50 -0.07 69
IV.ATCC.EHZ. 2021-08-18T19:52:18.05 0.3 undecidable manual P 317 58.1973 50 0.03 70
IV.EL6.EHZ. 2021-08-18T19:52:17.94 0.1 undecidable manual P 358 58.6968 50 -0.16 91
IV.FIAM.HHZ. 2021-08-18T19:52:17.92 0.3 undecidable manual P 181 59.0964 50 -0.22 67
IV.CESI.HHZ. 2021-08-18T19:52:17.72 0.3 undecidable manual S 321 29.0487 50 -0.23 71
IV.OFFI.HHZ. 2021-08-18T19:52:17.20 0.1 undecidable manual P 72 47.7189 50 0.8 77
IV.GAVE.EHZ. 2021-08-18T19:52:16.05 0.6 undecidable manual S 238 22.4553 114 0.04 50
IV.ASSB.HHZ. 2021-08-18T19:52:16.12 0.3 undecidable manual P 305 46.62 50 -0.11 71
IV.T1299.EHZ. 2021-08-18T19:52:16.08 0.3 undecidable manual S 146 22.2555 114 0.13 73
IV.LNSS.HHZ. 2021-08-18T19:52:16.44 0.3 undecidable manual S 198 23.0547 113 0.26 71
IV.CESX.HHZ. 2021-08-18T19:52:16.53 0.1 undecidable manual P 244 49.0176 50 -0.06 95
IV.MOMA.HHZ. 2021-08-18T19:52:16.11 0.3 undecidable manual P 271 45.4212 50 0.07 71
IV.FDMO.HHZ. 2021-08-18T19:52:16.87 0.3 undecidable manual S 353 26.4513 50 -0.37 69
IV.MNTP.HNZ. 2021-08-18T19:52:16.62 0.1 undecidable manual P 36 46.5201 50 0.4 89
IV.MNTT.EHZ. 2021-08-18T19:52:16.80 0.3 undecidable manual P 52 47.8188 50 0.39 66
IV.SMA1.EHZ. 2021-08-18T19:52:16.83 0.3 undecidable manual S 138 25.2525 111 -0.08 74
IT.MTCL.HGZ. 2021-08-18T19:52:16.05 0.3 undecidable manual S 334 23.8539 113 -0.41 69
IV.TERO.HHZ. 2021-08-18T19:52:15.44 0.3 undecidable manual P 117 43.5231 50 -0.31 68
IV.MDAR.HNZ. 2021-08-18T19:52:15.47 0.1 undecidable manual P 2 43.5231 50 -0.28 91
IV.ARRO.EHZ. 2021-08-18T19:52:15.02 0.1 positive manual P 230 38.4282 50 0.06 96
IV.MTRA.EHZ. 2021-08-18T19:52:15.69 0.3 undecidable manual S 102 22.3554 114 -0.29 71
IV.SAP2.EHZ. 2021-08-18T19:52:15.36 0.3 undecidable manual P 34 39.5271 50 0.22 70
IV.GUMA.HHZ. 2021-08-18T19:52:14.35 0.1 positive manual P 30 33.6441 50 0.13 96
IV.CAMP.HHZ. 2021-08-18T19:52:14.72 0.3 undecidable manual P 142 37.2294 50 -0.06 73
IV.MF5.EHZ. 2021-08-18T19:52:14.50 0.1 positive manual P 52 34.0437 50 0.21 94
IV.MMO1.EHZ. 2021-08-18T19:52:14.88 0.3 undecidable manual S 56 19.5693 117 -0.2 73
IV.FEMA.HNZ. 2021-08-18T19:52:14.85 0.3 undecidable manual S 341 19.0698 118 -0.08 75
IV.MML1.EHZ. 2021-08-18T19:52:14.58 0.1 undecidable manual P 340 37.0296 50 -0.17 95
IV.PF6.EHZ. 2021-08-18T19:52:14.62 0.1 undecidable manual P 8 37.8288 50 -0.26 93
IV.MC2.EHZ. 2021-08-18T19:52:13.40 0.3 undecidable manual S 22 13.2756 127 0.17 74
IV.CESI.HHZ. 2021-08-18T19:52:13.47 0.1 undecidable manual P 321 29.0487 50 -0.05 98
IV.CSP1.EHZ. 2021-08-18T19:52:13.92 0.1 positive manual P 11 32.9448 50 -0.2 95
IV.RM33.EHZ. 2021-08-18T19:52:13.93 0.3 undecidable manual P 168 33.0447 50 -0.21 71
IV.FDMO.HHZ. 2021-08-18T19:52:12.90 0.1 positive manual P 353 26.4513 50 -0.22 96
IV.MTRA.EHZ. 2021-08-18T19:52:12.26 0.3 undecidable manual P 102 22.3554 114 -0.13 73
IV.SMA1.EHZ. 2021-08-18T19:52:12.90 0.3 undecidable manual P 138 25.2525 111 -0.02 75
IT.MTCL.HGZ. 2021-08-18T19:52:12.51 0.3 undecidable manual P 334 23.8539 113 -0.15 73
IV.GAVE.EHZ. 2021-08-18T19:52:12.60 0.3 undecidable manual P 238 22.4553 114 0.2 72
IV.T1299.EHZ. 2021-08-18T19:52:12.53 0.3 undecidable manual P 146 22.2555 114 0.16 73
IV.LNSS.HHZ. 2021-08-18T19:52:12.61 0.1 undecidable manual P 198 23.0547 113 0.11 98
IV.NRCA.HHZ. 2021-08-18T19:52:11.02 0.3 undecidable manual S 343 3.8961 159 -0.15 75
IV.MC2.EHZ. 2021-08-18T19:52:11.02 0.1 undecidable manual P 22 13.2756 127 0.22 98
IV.MMO1.EHZ. 2021-08-18T19:52:11.80 0.1 positive manual P 56 19.5693 117 -0.07 100
IV.FEMA.HNZ. 2021-08-18T19:52:11.93 0.3 undecidable manual P 341 19.0698 118 0.15 74
IV.NRCA.HHZ. 2021-08-18T19:52:09.79 0.1 undecidable manual P 343 3.8961 159 0.18 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.HNE. ML:1.9 0.000558 0.16 AML other m 2021-08-18T19:52:16.59
IV.MTRA.EHE. ML:1.9 0.0005385 0.18 AML other m 2021-08-18T19:52:16.59
IV.MTRA.EHN. ML:1.8 0.000455 0.68 AML other m 2021-08-18T19:52:16.34
IV.MTRA.HNN. ML:1.9 0.0004904999999999999 0.68 AML other m 2021-08-18T19:52:16.34
IV.LNSS.HHE. ML:2.4 0.001765 0.3 AML other m 2021-08-18T19:52:16.87
IV.LNSS.HHN. ML:2.3 0.0012315 0.32 AML other m 2021-08-18T19:52:16.91
IV.FDMO.HHN. ML:1.7 0.0002935 0.72 AML other m 2021-08-18T19:52:17.46
IV.GAVE.EHN. ML:2.0 0.0006670000000000001 0.2 AML other m 2021-08-18T19:52:17.25
IV.GAVE.EHE. ML:2.1 0.0009130000000000001 0.24 AML other m 2021-08-18T19:52:17.30
IV.FDMO.HHE. ML:1.6 0.000216 0.56 AML other m 2021-08-18T19:52:17.49
IV.SMA1.EHN. ML:1.5 0.00019800000000000002 0.9 AML other m 2021-08-18T19:52:18.35
IV.GUMA.HHE. ML:2.2 0.0006975 0.24 AML other m 2021-08-18T19:52:20.18
IV.GUMA.HNE. ML:2.2 0.0006839999999999999 0.18 AML other m 2021-08-18T19:52:20.17
IV.RM33.EHN. ML:1.5 0.00013900000000000002 0.78 AML other m 2021-08-18T19:52:20.50
IV.CSP1.EHN. ML:2.1 0.0005155000000000001 0.32 AML other m 2021-08-18T19:52:20.34
IV.MML1.EHN. ML:1.6 0.00014950000000000003 0.22 AML other m 2021-08-18T19:52:20.23
IV.MF5.EHE. ML:1.8 0.0002405 0.3 AML other m 2021-08-18T19:52:20.39
IV.MF5.EHN. ML:1.8 0.000234 0.78 AML other m 2021-08-18T19:52:20.40
IV.MML1.EHE. ML:1.6 0.00014150000000000002 0.12 AML other m 2021-08-18T19:52:20.62
IV.CSP1.EHE. ML:2.1 0.0006065 0.8 AML other m 2021-08-18T19:52:20.57
IV.ARRO.EHE. ML:1.4 0.00009184999999999998 1.2 AML other m 2021-08-18T19:52:21.03
IV.ARRO.EHN. ML:1.4 0.0000942 1.62 AML other m 2021-08-18T19:52:21.16
IV.RM33.EHE. ML:1.6 0.000177 0.16 AML other m 2021-08-18T19:52:21.91
IV.SMA1.EHE. ML:1.6 0.00023199999999999997 0.92 AML other m 2021-08-18T19:52:22.53
IV.SAP2.EHN. ML:2.9 0.0026799999999999997 0.14 AML other m 2021-08-18T19:52:22.10
IV.SAP2.EHE. ML:2.0 0.0003179999999999999 0.48 AML other m 2021-08-18T19:52:23.10
IV.MOMA.HHE. ML:1.7 0.00015050000000000003 0.14 AML other m 2021-08-18T19:52:23.75
IV.ASSB.HHE. ML:1.5 0.00009504999999999999 0.16 AML other m 2021-08-18T19:52:24.44
IV.ASSB.HHN. ML:1.6 0.00011165 0.72 AML other m 2021-08-18T19:52:24.67
IV.MOMA.HHN. ML:1.7 0.00013450000000000002 0.2 AML other m 2021-08-18T19:52:25.44
IV.GUMA.HHN. ML:2.1 0.000506 0.34 AML other m 2021-08-18T19:52:25.48
IV.GUMA.HNN. ML:2.1 0.000494 0.32 AML other m 2021-08-18T19:52:25.65
IV.VCEL.EHE. ML:1.8 0.0000908 0.42 AML other m 2021-08-18T19:52:26.58
IV.MNTT.EHN. ML:2.3 0.000499 0.9 AML other m 2021-08-18T19:52:26.48
IV.FIAM.HHN. ML:1.2 0.0000292 0.6 AML other m 2021-08-18T19:52:27.57
IV.EL6.EHN. ML:2.0 0.00020250000000000002 0.74 AML other m 2021-08-18T19:52:27.51
IV.ATCC.EHE. ML:1.5 0.0000703 0.3 AML other m 2021-08-18T19:52:27.89
IV.FIAM.HHE. ML:1.1 0.00002675 0.78 AML other m 2021-08-18T19:52:28.66
IV.ATCC.EHN. ML:1.5 0.00006795000000000001 0.56 AML other m 2021-08-18T19:52:28.50
IV.CING.HHN. ML:1.7 0.00009515000000000001 0.92 AML other m 2021-08-18T19:52:29.50
IV.CING.HHE. ML:1.8 0.00010899999999999999 0.22 AML other m 2021-08-18T19:52:29.09
IV.EL6.EHE. ML:1.9 0.0001665 0.18 AML other m 2021-08-18T19:52:29.57
IV.MNTT.EHE. ML:2.6 0.0010455 1.22 AML other m 2021-08-18T19:52:29.31
IV.ARVD.HHE. ML:1.4 0.0000356 0.44 AML other m 2021-08-18T19:52:33.25
IV.MURB.HHE. ML:1.9 0.000122 0.42 AML other m 2021-08-18T19:52:35.54
IV.MURB.HHN. ML:1.8 0.0001095 0.42 AML other m 2021-08-18T19:52:35.69
IV.VCEL.EHN. ML:1.8 0.00009395000000000001 1.5 AML other m 2021-08-18T19:52:36.13
IV.ARVD.HHN. ML:1.3 0.0000289 0.42 AML other m 2021-08-18T19:52:40.48
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