Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 11-10-2021 and time 19:29:29 (Italy) in region 4 km N Spoleto (PG)

A magnitude ML 1.7 earthquake occured in region: 4 km N Spoleto (PG), on

  • 11-10-2021 17:29:29 (UTC)
  • 11-10-2021 19:29:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7750, 12.7490 at 11 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 9 364 44866
Scheggino PG 10 461 45327
Trevi PG 12 8469 53796
Cerreto di Spoleto PG 15 1075 54871
Giano dell'Umbria PG 16 3846 58717
Montefalco PG 16 5679 64396
Poggiodomo PG 17 117 64513
Ferentillo TR 17 1913 66426
Massa Martana PG 18 3770 70196
Acquasparta TR 19 4778 74974
Sellano PG 19 1079 76053
Montefranco TR 20 1276 77329

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 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)
79 Km W of Teramo (54892 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
90 Km N of Tivoli (56533 inhabitants)
100 Km N of Roma (2864731 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 1.7 2021-10-11
17:29:29		 42.775 12.7493 11 2022-03-30
13:04:22		 Bollettino Sismico Italiano INGV 98585931
Reviewed
Rev100 		ML 1.7 2021-10-11
17:29:29		 42.7733 12.7548 11 2021-10-11
17:38:21		 Sala Sismica INGV-Roma 96442421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-11 17:29:29 ± 0.04
Latitude 42.7750 ± 0.0027
Longitude 12.7493 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 98585931

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 262
Semi-minor axis of confidence ellipse (meter) 250
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 248
Circular confidence region, given by single value of horizontal uncertainty (meter) 260.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 66
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 39
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.56208
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 31
Type of magnitude ML
Reference to an origin 96442421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-11 17:38:21

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 30
Type of magnitude ML
Reference to an origin 98585931
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-16 11:45:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MF5.EHZ. 2021-10-11T17:29:48.87 1.0 undecidable manual S 68 62.3931 50 0.19 22
IV.SMA1.EHZ. 2021-10-11T17:29:46.00 0.3 undecidable manual S 108 50.4162 50 0.52 64
IV.RM33.EHZ. 2021-10-11T17:29:45.00 0.6 undecidable manual S 128 48.1185 50 0.13 47
IV.MMO1.EHZ. 2021-10-11T17:29:45.24 0.6 undecidable manual S 73 48.9177 50 0.14 47
IV.CSP1.EHZ. 2021-10-11T17:29:45.88 0.3 undecidable manual S 46 51.0156 50 0.22 68
IV.MML1.EHZ. 2021-10-11T17:29:43.25 0.6 undecidable manual S 26 41.625 50 0.09 48
IV.MC2.EHZ. 2021-10-11T17:29:42.64 0.3 undecidable manual S 67 38.8278 50 0.24 70
IV.FDMO.HHZ. 2021-10-11T17:29:42.66 0.3 undecidable manual S 43 39.9267 50 -0.04 72
IV.MF5.EHZ. 2021-10-11T17:29:41.14 0.1 undecidable manual P 68 62.3931 50 0.57 82
IV.FEMA.HNE. 2021-10-11T17:29:40.48 0.3 undecidable manual S 50 32.0457 50 -0.11 72
IT.MTCL.HGZ. 2021-10-11T17:29:40.24 0.3 undecidable manual S 40 31.6461 50 -0.25 70
IV.ASSB.HHZ. 2021-10-11T17:29:40.25 0.1 undecidable manual S 346 30.5472 50 0.05 98
IV.CESI.HHZ. 2021-10-11T17:29:39.50 0.3 undecidable manual S 26 28.4493 50 -0.13 73
IV.MGAB.HHZ. 2021-10-11T17:29:39.45 1.0 positive manual P 287 54.0015 50 0.17 23
IV.NRCA.HHZ. 2021-10-11T17:29:39.76 0.1 undecidable manual S 78 30.4473 50 -0.39 91
IV.LNSS.HHZ. 2021-10-11T17:29:39.94 0.6 undecidable manual S 129 30.4473 50 -0.22 47
IV.APEC.HHZ. 2021-10-11T17:29:39.59 3.0 positive manual P -3.98 0
IV.CSP1.EHZ. 2021-10-11T17:29:38.77 0.1 undecidable manual P 46 51.0156 50 -0.05 94
IV.RM33.EHZ. 2021-10-11T17:29:38.29 0.6 positive manual P 128 48.1185 50 -0.08 47
IV.MMO1.EHZ. 2021-10-11T17:29:38.41 0.1 undecidable manual P 73 48.9177 50 -0.09 94
IV.SMA1.EHZ. 2021-10-11T17:29:38.84 0.3 negative manual P 108 50.4162 50 0.12 70
IV.MML1.EHZ. 2021-10-11T17:29:37.28 0.1 undecidable manual P 26 41.625 50 -0.09 95
IV.CESX.HHZ. 2021-10-11T17:29:37.86 0.6 undecidable manual S 216 22.755 50 -0.25 48
IV.ARRO.EHZ. 2021-10-11T17:29:37.84 0.6 undecidable manual S 176 21.7671 50 -0.01 50
IV.FDMO.HHZ. 2021-10-11T17:29:36.92 0.1 undecidable manual P 43 39.9267 50 -0.19 94
IV.FEMA.HNE. 2021-10-11T17:29:36.01 0.1 undecidable manual P 50 32.0457 50 0.12 96
IV.MC2.EHZ. 2021-10-11T17:29:36.98 0.1 undecidable manual P 67 38.8278 50 0.04 97
IV.LNSS.HHZ. 2021-10-11T17:29:35.51 0.1 negative manual P 129 30.4473 50 -0.14 96
IV.GAVE.EHZ. 2021-10-11T17:29:35.72 0.6 undecidable manual S 128 14.9739 125 -0.13 49
IT.MTCL.HGZ. 2021-10-11T17:29:35.84 0.1 undecidable manual P 40 31.6461 50 0 99
IV.ASSB.HHZ. 2021-10-11T17:29:35.62 0.1 undecidable manual P 346 30.5472 50 -0.05 98
IV.MOMA.HHZ. 2021-10-11T17:29:35.76 0.3 undecidable manual S 282 14.9739 125 -0.09 75
IV.CESI.HHZ. 2021-10-11T17:29:35.28 0.1 undecidable manual P 26 28.4493 50 -0.06 98
IT.GNU.HGE. 2021-10-11T17:29:35.80 0.6 undecidable manual S 282 14.9739 125 -0.04 50
IV.NRCA.HHZ. 2021-10-11T17:29:35.46 0.1 undecidable manual P 78 30.4473 50 -0.18 95
IV.CESX.HHZ. 2021-10-11T17:29:34.47 0.6 negative manual P 216 22.755 50 0.01 50
IV.ARRO.EHZ. 2021-10-11T17:29:34.36 0.1 undecidable manual P 176 21.7671 50 0.05 99
IT.GNU.HGE. 2021-10-11T17:29:33.28 0.1 undecidable manual P 282 14.9739 125 0.13 99
IV.GAVE.EHZ. 2021-10-11T17:29:33.08 0.1 negative manual P 128 14.9739 125 -0.08 100
IV.MOMA.HHZ. 2021-10-11T17:29:33.30 0.1 negative manual P 282 14.9739 125 0.14 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.8 0.0006225 0.44 AML other m 2021-10-11T17:29:36.05
IV.MOMA.HNN. ML:1.7 0.0005254999999999999 0.82 AML other m 2021-10-11T17:29:36.28
IV.GAVE.EHE. ML:1.9 0.000728 0.1 AML other m 2021-10-11T17:29:36.29
IV.MOMA.HHE. ML:2.2 0.0016899999999999999 0.26 AML other m 2021-10-11T17:29:36.47
IV.MOMA.HNE. ML:2.2 0.001575 0.24 AML other m 2021-10-11T17:29:36.47
IV.GAVE.HNE. ML:1.9 0.000754 0.76 AML other m 2021-10-11T17:29:36.62
IV.MOMA.HHN. ML:1.8 0.0005560000000000001 0.56 AML other m 2021-10-11T17:29:36.96
IV.ARRO.EHE. ML:1.4 0.00015899999999999996 0.86 AML other m 2021-10-11T17:29:38.62
IV.GAVE.HNN. ML:1.3 0.00016983987499999997 0.1152 AML other m 2021-10-11T17:29:36.04
IV.CESX.HHE. ML:1.5 0.00019 0.24 AML other m 2021-10-11T17:29:39.60
IV.CESX.HHN. ML:1.6 0.000261 1.74 AML other m 2021-10-11T17:29:39.89
IV.LNSS.HHE. ML:1.8 0.000323 1.04 AML other m 2021-10-11T17:29:40.15
IV.NRCA.HHN. ML:1.9 0.0003795 0.32 AML other m 2021-10-11T17:29:40.75
IV.LNSS.HHN. ML:1.8 0.000312 0.24 AML other m 2021-10-11T17:29:40.64
IV.ASSB.HHN. ML:1.6 0.00021050000000000002 0.6 AML other m 2021-10-11T17:29:41.65
IV.ASSB.HHE. ML:1.7 0.00021250000000000002 1.2 AML other m 2021-10-11T17:29:41.72
IV.NRCA.HHE. ML:2.0 0.00041349999999999997 0.7 AML other m 2021-10-11T17:29:41.60
IV.ARRO.EHN. ML:1.2 0.00011449999999999999 0.66 AML other m 2021-10-11T17:29:42.47
IV.FDMO.HHE. ML:1.8 0.0002315 0.22 AML other m 2021-10-11T17:29:43.36
IV.FDMO.HHN. ML:1.7 0.000169 0.26 AML other m 2021-10-11T17:29:43.57
IV.MML1.EHN. ML:1.6 0.00011949999999999999 0.62 AML other m 2021-10-11T17:29:44.39
IV.MML1.EHE. ML:1.5 0.00009715 1.34 AML other m 2021-10-11T17:29:44.90
IV.RM33.EHN. ML:1.6 0.00010614999999999999 0.98 AML other m 2021-10-11T17:29:46.67
IV.RM33.EHE. ML:1.7 0.000131 0.46 AML other m 2021-10-11T17:29:46.89
IV.CSP1.EHE. ML:2.2 0.000449 0.46 AML other m 2021-10-11T17:29:46.69
IV.CSP1.EHN. ML:2.1 0.000341 0.8 AML other m 2021-10-11T17:29:47.18
IV.SMA1.EHN. ML:1.8 0.000158 1.04 AML other m 2021-10-11T17:29:47.83
IV.SMA1.EHE. ML:1.9 0.00020250000000000002 0.82 AML other m 2021-10-11T17:29:49.71
IV.MGAB.HHN. ML:1.4 0.0000656 1.52 AML other m 2021-10-11T17:29:50.81
IV.MGAB.HHE. ML:1.5 0.00006845 1.04 AML other m 2021-10-11T17:29:53.29
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