Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 18-10-2021 and time 22:20:07 (Italy) in region 5 km N Spoleto (PG)

A magnitude ML 1.6 earthquake occured in region: 5 km N Spoleto (PG), on

  • 18-10-2021 20:20:07 (UTC)
  • 18-10-2021 22:20:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7770, 12.7460 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
Spoleto PG 5 38218 38218
Campello sul Clitunno PG 6 2442 40660
Castel Ritaldi PG 8 3278 43938
Sant'Anatolia di Narco PG 9 564 44502
Vallo di Nera PG 10 364 44866
Scheggino PG 10 461 45327
Trevi PG 11 8469 53796
Cerreto di Spoleto PG 15 1075 54871
Giano dell'Umbria PG 15 3846 58717
Montefalco PG 15 5679 64396
Poggiodomo PG 17 117 64513
Ferentillo TR 18 1913 66426
Massa Martana PG 18 3770 70196
Acquasparta TR 19 4778 74974
Sellano PG 20 1079 76053
Montefranco TR 20 1276 77329

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km S of Foligno (57155 inhabitants)
25 Km NE of Terni (111501 inhabitants)
47 Km SE of Perugia (166134 inhabitants)
66 Km NE of Viterbo (67173 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
80 Km W of Teramo (54892 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
90 Km N 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 2021-10-18
20:20:07		 42.7768 12.7457 8 2022-03-30
13:04:14		 Bollettino Sismico Italiano INGV 97056041
Reviewed
Rev100 		ML 1.5 2021-10-18
20:20:07		 42.776 12.7308 11 2021-10-18
20:28:27		 Sala Sismica INGV-Roma 96736041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-18 20:20:07 ± 0.05
Latitude 42.7768 ± 0.0027
Longitude 12.7457 ± 0.0037
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 97056041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 250
Semi-minor axis of confidence ellipse (meter) 190
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 120
Circular confidence region, given by single value of horizontal uncertainty (meter) 250.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 62
Number of defining phases 60
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.77342
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 31
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 48
Type of magnitude ML
Reference to an origin 97056041
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-16 15:24:46

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 42
Type of magnitude ML
Reference to an origin 96736041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-18 20:28:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
OT.OT17.EHZ. 2021-10-18T20:21:17.13 3.0 undecidable manual Sn 3.91 0
IV.ARVD.HHZ. 2021-10-18T20:20:33.99 0.6 undecidable manual S 11 81.5517 50 1.12 31
IV.SSFR.HHZ. 2021-10-18T20:20:31.27 0.6 undecidable manual S 2 73.1712 50 0.63 39
IV.OSSC.HHZ. 2021-10-18T20:20:30.96 3.0 undecidable manual P -1.2 0
IV.EL6.EHZ. 2021-10-18T20:20:29.50 0.6 undecidable manual S 25 67.7766 50 0.32 43
IV.SRES.HHZ. 2021-10-18T20:20:28.14 0.6 undecidable manual S 198 62.8926 50 0.25 44
IV.GUMA.HHZ. 2021-10-18T20:20:27.16 0.6 undecidable manual S 56 57.3981 50 0.73 39
IV.MURB.HHZ. 2021-10-18T20:20:27.07 0.6 undecidable manual S 342 56.7987 50 0.8 38
IV.FOSV.EHZ. 2021-10-18T20:20:26.85 0.6 undecidable manual S 1 57.498 50 0.41 43
IV.MTRA.EHE. 2021-10-18T20:20:25.18 0.3 undecidable manual S 92 53.1024 50 -0.08 70
IV.MGAB.HHZ. 2021-10-18T20:20:25.74 0.6 undecidable manual S 287 53.7018 50 0.32 45
IV.CSP1.EHZ. 2021-10-18T20:20:24.79 0.6 undecidable manual S 47 51.1155 50 0.05 47
IV.SMA1.EHZ. 2021-10-18T20:20:24.99 0.6 undecidable manual S 108 50.7159 50 0.35 44
IV.T1299.HNN. 2021-10-18T20:20:23.64 0.6 undecidable manual S 110 46.5201 50 0.13 47
IV.PIEI.HHZ. 2021-10-18T20:20:23.09 0.3 undecidable manual P 349 85.8474 50 0.09 66
IV.ATCC.EHZ. 2021-10-18T20:20:23.38 0.6 undecidable manual S 349 46.1205 50 -0.02 48
IV.RM33.EHZ. 2021-10-18T20:20:23.77 0.6 undecidable manual S 128 48.4182 50 -0.25 46
IV.ARVD.HHZ. 2021-10-18T20:20:22.73 0.3 undecidable manual P 11 81.5517 50 0.39 62
IV.MML1.EHZ. 2021-10-18T20:20:21.90 0.6 undecidable manual S 26 41.625 50 -0.31 46
IV.FDMO.HHZ. 2021-10-18T20:20:21.54 0.6 undecidable manual S 44 40.0266 50 -0.24 46
IV.MC2.EHZ. 2021-10-18T20:20:21.54 0.6 undecidable manual S 67 39.0276 50 0.02 49
IV.SSFR.HHZ. 2021-10-18T20:20:20.77 0.3 undecidable manual P 2 73.1712 50 -0.28 65
IV.EL6.EHZ. 2021-10-18T20:20:20.00 0.1 undecidable manual P 25 67.7766 50 -0.21 89
IV.SRES.HHZ. 2021-10-18T20:20:19.43 0.3 undecidable manual P 198 62.8926 50 -0.03 70
IT.MTCL.HGN. 2021-10-18T20:20:19.12 0.3 undecidable manual S 40 31.746 104 -0.17 72
IV.FEMA.HNN. 2021-10-18T20:20:19.54 0.3 undecidable manual S 50 32.1456 104 0.1 73
IV.MF5.EHZ. 2021-10-18T20:20:19.83 0.1 undecidable manual P 68 62.5929 50 0.42 86
IV.FOSV.EHZ. 2021-10-18T20:20:18.38 0.3 undecidable manual P 1 57.498 50 -0.24 67
IV.ASSB.HHZ. 2021-10-18T20:20:18.54 0.6 undecidable manual S 347 30.3474 105 -0.28 47
IV.MURB.HHZ. 2021-10-18T20:20:18.32 0.1 undecidable manual P 342 56.7987 50 -0.2 91
IV.NRCA.HHZ. 2021-10-18T20:20:18.96 0.6 undecidable manual S 78 30.6471 105 0.02 49
IV.CESI.HHZ. 2021-10-18T20:20:18.24 0.6 undecidable manual S 27 28.4493 106 0.06 49
IV.GUMA.HHZ. 2021-10-18T20:20:18.73 0.1 undecidable manual P 56 57.3981 50 0.11 92
IV.LNSS.HHZ. 2021-10-18T20:20:18.80 0.6 undecidable manual S 129 30.8469 104 -0.19 48
IV.SMA1.EHZ. 2021-10-18T20:20:17.67 0.3 undecidable manual P 108 50.7159 50 0.09 70
IV.MGAB.HHZ. 2021-10-18T20:20:17.79 0.1 undecidable manual P 287 53.7018 50 -0.25 90
IV.CSP1.EHZ. 2021-10-18T20:20:17.36 0.1 undecidable manual P 47 51.1155 50 -0.28 90
IV.MTRA.EHE. 2021-10-18T20:20:17.73 0.3 undecidable manual P 92 53.1024 50 -0.22 68
IV.RM33.EHZ. 2021-10-18T20:20:16.90 0.1 undecidable manual P 128 48.4182 50 -0.33 90
IV.T1299.HNN. 2021-10-18T20:20:16.76 0.1 positive manual P 110 46.5201 50 -0.17 93
IV.ARRO.EHZ. 2021-10-18T20:20:16.32 0.6 undecidable manual S 176 21.9669 110 0.26 48
IV.ATCC.EHZ. 2021-10-18T20:20:16.55 0.1 undecidable manual P 349 46.1205 50 -0.32 90
IT.FOPC.HGE. 2021-10-18T20:20:16.49 0.6 undecidable manual S 351 21.6672 110 0.53 45
IV.CESX.HHZ. 2021-10-18T20:20:16.17 0.6 undecidable manual S 215 22.755 109 -0.13 49
IV.FDMO.HHZ. 2021-10-18T20:20:15.59 0.1 undecidable manual P 44 40.0266 50 -0.34 91
IV.MML1.EHZ. 2021-10-18T20:20:15.81 0.1 undecidable manual P 26 41.625 50 -0.37 90
IV.MC2.EHZ. 2021-10-18T20:20:15.70 0.1 undecidable manual P 67 39.0276 50 -0.08 96
IV.NRCA.HHZ. 2021-10-18T20:20:14.18 0.1 undecidable manual P 78 30.6471 105 -0.11 97
IV.GAVE.EHZ. 2021-10-18T20:20:14.61 0.6 undecidable manual S 128 15.2736 117 0.68 43
IV.LNSS.HHZ. 2021-10-18T20:20:14.11 0.1 undecidable manual P 129 30.8469 104 -0.21 95
IT.MTCL.HGN. 2021-10-18T20:20:14.34 0.3 undecidable manual P 40 31.746 104 -0.15 72
IV.FEMA.HNN. 2021-10-18T20:20:14.72 0.1 undecidable manual P 50 32.1456 104 0.14 96
IV.CESI.HHZ. 2021-10-18T20:20:13.77 0.1 undecidable manual P 27 28.4493 106 -0.08 98
IV.ARRO.EHZ. 2021-10-18T20:20:13.02 0.1 undecidable manual P 176 21.9669 110 0.4 93
IT.GNU.HGE. 2021-10-18T20:20:13.70 0.6 undecidable manual S 282 14.5743 119 -0.01 51
IV.ASSB.HHZ. 2021-10-18T20:20:13.95 0.1 undecidable manual P 347 30.3474 105 -0.27 94
IV.MOMA.HHZ. 2021-10-18T20:20:13.67 0.6 undecidable manual S 282 14.5743 119 -0.04 51
IV.CESX.HHZ. 2021-10-18T20:20:12.60 0.1 undecidable manual P 215 22.755 109 -0.17 97
IT.FOPC.HGE. 2021-10-18T20:20:12.68 0.3 undecidable manual P 351 21.6672 110 0.11 74
IT.GNU.HGE. 2021-10-18T20:20:11.43 0.3 undecidable manual P 282 14.5743 119 0.16 74
IV.MOMA.HHZ. 2021-10-18T20:20:11.37 0.1 undecidable manual P 282 14.5743 119 0.09 100
IV.GAVE.EHZ. 2021-10-18T20:20:11.69 0.1 positive manual P 128 15.2736 117 0.28 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:2.0 0.00108323165 0.128 AML other m 2021-10-18T20:20:14.05
IV.MOMA.HNN. ML:2.0 0.00105966365 0.1536 AML other m 2021-10-18T20:20:14.07
IV.MOMA.HHE. ML:2.1 0.00144951925 0.2816 AML other m 2021-10-18T20:20:14.17
IV.GAVE.HNN. ML:1.3 0.00020585785 0.5632 AML other m 2021-10-18T20:20:14.47
IV.MOMA.HNE. ML:2.3 0.001965 0.2 AML other m 2021-10-18T20:20:14.19
IV.GAVE.HNE. ML:1.7 0.00048990635 0.2944 AML other m 2021-10-18T20:20:14.70
IV.GAVE.EHE. ML:1.7 0.00054413885 0.2944 AML other m 2021-10-18T20:20:14.85
IV.ARRO.EHE. ML:1.2 0.00012022515 0.5376 AML other m 2021-10-18T20:20:16.74
IV.CESX.HHN. ML:1.5 0.000229354 0.2048 AML other m 2021-10-18T20:20:16.78
IV.CESX.HHE. ML:1.4 0.00017607970000000001 0.704 AML other m 2021-10-18T20:20:16.90
IV.ARRO.EHN. ML:1.2 0.0001121742 0.1408 AML other m 2021-10-18T20:20:17.17
IV.CESI.HHE. ML:1.2 0.00008936631 0.576 AML other m 2021-10-18T20:20:18.60
IV.CESI.HHN. ML:1.4 0.00011989525000000001 0.2176 AML other m 2021-10-18T20:20:18.66
IV.LNSS.HHE. ML:1.9 0.0003815 1.84 AML other m 2021-10-18T20:20:18.03
IV.LNSS.HNE. ML:1.9 0.00036944850000000004 1.8208 AML other m 2021-10-18T20:20:18.95
IV.LNSS.HHN. ML:1.8 0.00034187599999999996 0.3584 AML other m 2021-10-18T20:20:19.33
IV.NRCA.HHN. ML:1.5 0.00014792985 0.3968 AML other m 2021-10-18T20:20:19.42
IV.NRCA.HHE. ML:1.7 0.00022823385 0.1024 AML other m 2021-10-18T20:20:19.30
IV.NRCA.HNE. ML:1.6 0.00020558385 0.1152 AML other m 2021-10-18T20:20:19.32
IV.LNSS.HNN. ML:1.9 0.0003900846 0.1664 AML other m 2021-10-18T20:20:19.54
IV.FDMO.HHN. ML:1.2 0.00005794089 0.1792 AML other m 2021-10-18T20:20:21.73
IV.FDMO.HHE. ML:1.5 0.00009893163 0.128 AML other m 2021-10-18T20:20:21.89
IV.MML1.EHE. ML:1.0 0.000028438235 0.32 AML other m 2021-10-18T20:20:22.28
IV.MML1.EHN. ML:1.1 0.000038963735 0.1408 AML other m 2021-10-18T20:20:22.46
IV.ATCC.EHN. ML:1.4 0.000070204035 0.3968 AML other m 2021-10-18T20:20:23.67
IV.ATCC.EHE. ML:1.4 0.000082083105 0.5248 AML other m 2021-10-18T20:20:23.78
IV.RM33.EHN. ML:1.2 0.000045187105 0.4224 AML other m 2021-10-18T20:20:24.56
IV.RM33.EHE. ML:1.2 0.000042242675 0.2048 AML other m 2021-10-18T20:20:24.45
IV.CSP1.EHN. ML:1.7 0.00013784200000000003 0.5376 AML other m 2021-10-18T20:20:24.90
IV.CSP1.EHE. ML:1.7 0.00013405075 0.4352 AML other m 2021-10-18T20:20:25.06
IV.SMA1.EHE. ML:1.6 0.00010606112499999999 0.32 AML other m 2021-10-18T20:20:25.34
IV.SMA1.EHN. ML:1.5 0.00007420566 0.6144 AML other m 2021-10-18T20:20:25.82
IV.MGAB.HHE. ML:1.2 0.00003437913 0.2816 AML other m 2021-10-18T20:20:26.20
IV.FOSV.EHN. ML:1.1 0.000026494395000000005 0.2944 AML other m 2021-10-18T20:20:27.13
IV.MURB.HHE. ML:1.8 0.0001558813 0.2816 AML other m 2021-10-18T20:20:27.26
IV.FOSV.EHE. ML:1.3 0.000047417595 0.2816 AML other m 2021-10-18T20:20:27.37
IV.GUMA.HNE. ML:1.7 0.000100251485 0.2304 AML other m 2021-10-18T20:20:27.32
IV.GUMA.HHE. ML:1.9 0.000179 0.26 AML other m 2021-10-18T20:20:27.44
IV.MURB.HNE. ML:1.8 0.000150365785 0.8192 AML other m 2021-10-18T20:20:27.14
IV.GUMA.HNN. ML:1.6 0.000096862555 0.2688 AML other m 2021-10-18T20:20:27.69
IV.MURB.HNN. ML:1.8 0.000146669595 0.2688 AML other m 2021-10-18T20:20:27.73
IV.MURB.HHN. ML:1.8 0.00013006335 0.2432 AML other m 2021-10-18T20:20:27.48
IV.GUMA.HHN. ML:1.7 0.000098059095 0.2816 AML other m 2021-10-18T20:20:28.06
IV.SRES.HHN. ML:0.9 0.000014173644999999999 0.2944 AML other m 2021-10-18T20:20:28.47
IV.EL6.EHE. ML:1.5 0.00005166652 0.1408 AML other m 2021-10-18T20:20:30.16
IV.SSFR.HHE. ML:1.5 0.000043634685 0.2432 AML other m 2021-10-18T20:20:31.98
IV.SSFR.HHN. ML:1.4 0.000035996295 0.256 AML other m 2021-10-18T20:20:31.93
IV.SSFR.HNN. ML:2.0 0.00014226655 0.8064 AML other m 2021-10-18T20:20:32.08
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