Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 17-10-2021 and time 07:43:45 (Italy) in region 4 km NE Spoleto (PG)

A magnitude ML 1.5 earthquake occured in region: 4 km NE Spoleto (PG), on

  • 17-10-2021 05:43:45 (UTC)
  • 17-10-2021 07:43:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7670, 12.7560 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 4 38218 38218
Campello sul Clitunno PG 6 2442 40660
Sant'Anatolia di Narco PG 8 564 41224
Scheggino PG 9 461 41685
Vallo di Nera PG 9 364 42049
Castel Ritaldi PG 9 3278 45327
Trevi PG 12 8469 53796
Cerreto di Spoleto PG 15 1075 54871
Poggiodomo PG 16 117 54988
Giano dell'Umbria PG 16 3846 58834
Ferentillo TR 16 1913 60747
Montefalco PG 17 5679 66426
Montefranco TR 19 1276 67702
Massa Martana PG 19 3770 71472
Acquasparta TR 19 4778 76250
Sellano PG 20 1079 77329

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km S of Foligno (57155 inhabitants)
25 Km NE of Terni (111501 inhabitants)
48 Km SE of Perugia (166134 inhabitants)
66 Km NE of Viterbo (67173 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
79 Km W of Teramo (54892 inhabitants)
85 Km N of Guidonia Montecelio (88673 inhabitants)
89 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 1.5 2021-10-17
05:43:45		 42.7668 12.7558 11 2022-03-30
13:04:12		 Bollettino Sismico Italiano INGV 96802721
Reviewed
Rev100 		ML 1.5 2021-10-17
05:43:45		 42.7683 12.7543 11 2021-10-17
05:50:00		 Sala Sismica INGV-Roma 96673621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-17 05:43:45 ± 0.04
Latitude 42.7668 ± 0.0027
Longitude 12.7558 ± 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 96802721

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 352
Semi-minor axis of confidence ellipse (meter) 278
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 216
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
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 50
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.61604
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 96802721
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-20 14:16:31

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 96673621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-17 05:50:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FREG.EHZ. 2021-10-17T05:44:55.92 3.0 undecidable manual Sn -7.1 0
MN.VSL.HHZ. 2021-10-17T05:44:50.21 3.0 undecidable manual Sn 2.82 0
IV.RESU.HHZ. 2021-10-17T05:44:25.60 3.0 undecidable manual Pg 22.889999 0
MN.TRI.HHZ. 2021-10-17T05:44:21.08 3.0 positive manual Pg 15.66 0
IV.SELL.HHZ. 2021-10-17T05:44:14.56 3.0 positive manual Pg 18.84 0
IV.CMPR.HHZ. 2021-10-17T05:44:12.80 3.0 undecidable manual Sg 17.17 0
IV.EL6.EHZ. 2021-10-17T05:44:06.95 0.1 undecidable manual S 24 68.376 50 0.61 79
IV.CSP1.EHZ. 2021-10-17T05:44:02.00 0.3 undecidable manual S 45 51.3153 50 0.23 67
IV.ATCC.EHZ. 2021-10-17T05:44:01.22 1.0 undecidable manual S 349 47.3193 50 0.5 21
IV.MML1.EHZ. 2021-10-17T05:43:59.52 0.6 undecidable manual S 24 42.2244 50 0.15 46
IV.COR1.EHZ. 2021-10-17T05:43:58.49 3.0 undecidable manual Sn -6.06 0
IV.FDMO.HHZ. 2021-10-17T05:43:58.59 0.6 undecidable manual S 42 40.2264 50 -0.24 46
IV.MC2.EHZ. 2021-10-17T05:43:58.76 0.1 undecidable manual S 65 38.7279 50 0.34 90
IV.EL6.EHZ. 2021-10-17T05:43:57.58 0.1 undecidable manual P 24 68.376 50 0.03 91
IV.ASSB.HHZ. 2021-10-17T05:43:56.50 0.1 undecidable manual S 346 31.5462 50 -0.02 97
IV.MGAB.HHZ. 2021-10-17T05:43:56.00 3.0 undecidable manual Sg -0.72 0
IV.FEMA.HNE. 2021-10-17T05:43:56.65 0.3 undecidable manual S 48 32.2455 50 -0.04 72
IV.NRCA.HHZ. 2021-10-17T05:43:55.99 0.1 undecidable manual S 76 30.1476 50 -0.13 95
IV.SNTG.HHZ. 2021-10-17T05:43:55.33 0.1 undecidable manual P 15 56.1993 50 -0.34 87
IV.CESI.HHZ. 2021-10-17T05:43:55.60 0.1 undecidable manual S 25 29.0487 50 -0.24 93
IV.ATCC.EHZ. 2021-10-17T05:43:54.57 0.1 undecidable manual P 349 47.3193 50 0.26 90
IV.CSP1.EHZ. 2021-10-17T05:43:54.97 0.1 undecidable manual P 45 51.3153 50 0.05 93
IV.MML1.EHZ. 2021-10-17T05:43:53.29 0.1 undecidable manual P 24 42.2244 50 -0.24 91
IV.ARRO.EHZ. 2021-10-17T05:43:53.87 0.6 undecidable manual S 178 20.868 50 0.22 48
IV.CESX.HHZ. 2021-10-17T05:43:53.99 0.6 undecidable manual S 218 22.3554 50 -0.06 48
IV.FDMO.HHZ. 2021-10-17T05:43:53.11 0.1 undecidable manual P 42 40.2264 50 -0.11 94
IV.MC2.EHZ. 2021-10-17T05:43:53.04 0.1 undecidable manual P 65 38.7279 50 0.06 95
IV.FEMA.HNE. 2021-10-17T05:43:52.04 0.1 undecidable manual P 48 32.2455 50 0.05 96
IT.GNU.HGE. 2021-10-17T05:43:52.36 0.1 undecidable manual S 285 15.6732 124 0.22 95
IV.NRCA.HHZ. 2021-10-17T05:43:51.53 0.1 undecidable manual P 76 30.1476 50 -0.12 95
IV.GAVE.EHZ. 2021-10-17T05:43:51.58 0.1 undecidable manual S 126 13.9749 127 -0.09 100
IV.CESI.HHZ. 2021-10-17T05:43:51.30 0.1 undecidable manual P 25 29.0487 50 -0.19 94
IV.LNSS.HNZ. 2021-10-17T05:43:51.52 0.1 undecidable manual P 128 29.4483 50 -0.04 97
IV.MOMA.HHZ. 2021-10-17T05:43:51.99 0.1 undecidable manual S 285 15.6732 124 -0.15 98
IT.MTCL.HGZ. 2021-10-17T05:43:51.78 0.1 undecidable manual P 38 32.0457 50 -0.17 94
IV.ASSB.HHZ. 2021-10-17T05:43:51.74 0.1 undecidable manual P 346 31.5462 50 -0.14 95
IV.CESX.HHZ. 2021-10-17T05:43:50.44 0.1 undecidable manual P 218 22.3554 50 -0.01 98
IV.CAFE.HHZ. 2021-10-17T05:43:50.43 3.0 undecidable manual Sn 5.51 0
IV.ARRO.EHZ. 2021-10-17T05:43:50.38 0.1 undecidable manual P 178 20.868 50 0.16 96
IV.GAVE.EHZ. 2021-10-17T05:43:49.16 0.1 undecidable manual P 126 13.9749 127 0.08 98
IV.MOMA.HHZ. 2021-10-17T05:43:49.29 0.1 undecidable manual P 285 15.6732 124 -0.06 99
IT.GNU.HGE. 2021-10-17T05:43:49.36 0.1 undecidable manual P 285 15.6732 124 0.01 100
IV.MNTT.EHZ. 2021-10-17T05:43:48.59 3.0 undecidable manual Sg -1.19 0
IV.ATFO.HHZ. 2021-10-17T05:43:37.34 3.0 undecidable manual P 0
IV.CAFE.HHZ. 2021-10-17T05:43:30.28 3.0 undecidable manual Pn 3.07 0
IV.VAGA.HNZ. 2021-10-17T05:43:27.57 3.0 undecidable manual Sn -1.08 0
IV.TERO.HHZ. 2021-10-17T05:43:26.86 3.0 undecidable manual S 0
IV.TERO.HHZ. 2021-10-17T05:43:22.25 3.0 undecidable manual P 0
IV.SGG.HHZ. 2021-10-17T05:43:21.63 3.0 positive manual P 2.65 0
IV.POFI.HHZ. 2021-10-17T05:43:16.91 3.0 undecidable manual P 0.36 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.7 0.0004855 0.86 AML other m 2021-10-17T05:43:52.13
IV.MOMA.HHE. ML:1.8 0.0006154999999999999 0.18 AML other m 2021-10-17T05:43:52.49
IV.GAVE.EHE. ML:1.6 0.0004385 0.48 AML other m 2021-10-17T05:43:52.59
IV.MOMA.HHN. ML:1.5 0.00026649999999999997 0.2 AML other m 2021-10-17T05:43:53.20
IV.ARRO.EHE. ML:1.1 0.00008415 0.58 AML other m 2021-10-17T05:43:54.67
IV.CESX.HHE. ML:1.4 0.0001705 0.44 AML other m 2021-10-17T05:43:55.61
IV.CESX.HHN. ML:1.6 0.0002375 0.94 AML other m 2021-10-17T05:43:55.01
IV.CESI.HHN. ML:1.5 0.0001545 1.68 AML other m 2021-10-17T05:43:55.02
IV.ARRO.EHN. ML:1.1 0.00008585000000000001 1.2 AML other m 2021-10-17T05:43:56.64
IV.CESI.HHE. ML:1.3 0.000104 0.52 AML other m 2021-10-17T05:43:56.03
IV.ASSB.HHE. ML:1.3 0.00009435 0.56 AML other m 2021-10-17T05:43:56.68
IV.ASSB.HHN. ML:1.3 0.0000916 0.96 AML other m 2021-10-17T05:43:57.36
IV.FDMO.HHE. ML:1.5 0.0001088 0.48 AML other m 2021-10-17T05:43:59.40
IV.FDMO.HHN. ML:1.4 0.0000854 0.12 AML other m 2021-10-17T05:43:59.81
IV.MML1.EHN. ML:1.2 0.00005225 0.76 AML other m 2021-10-17T05:44:00.05
IV.MML1.EHE. ML:1.2 0.00005725 1.56 AML other m 2021-10-17T05:44:02.15
IV.CSP1.EHN. ML:2.0 0.0002315 0.68 AML other m 2021-10-17T05:44:02.38
IV.CSP1.EHE. ML:2.0 0.0002405 0.26 AML other m 2021-10-17T05:44:02.86
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