Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 17-10-2021 and time 07:05:09 (Italy) in region 4 km N Spoleto (PG)

A magnitude ML 1.2 earthquake occured in region: 4 km N Spoleto (PG), on

  • 17-10-2021 05:05:09 (UTC)
  • 17-10-2021 07:05:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7720, 12.7500 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
Spoleto PG 4 38218 38218
Campello sul Clitunno PG 6 2442 40660
Sant'Anatolia di Narco PG 8 564 41224
Castel Ritaldi PG 9 3278 44502
Vallo di Nera PG 9 364 44866
Scheggino PG 9 461 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 19 3770 70196
Acquasparta TR 19 4778 74974
Montefranco TR 19 1276 76250
Sellano PG 20 1079 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)
48 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 1.2 2021-10-17
05:05:09		 42.7722 12.7503 10 2022-03-30
13:04:12		 Bollettino Sismico Italiano INGV 96756741
Reviewed
Rev100 		ML 1.2 2021-10-17
05:05:09		 42.7708 12.7503 11 2021-10-17
05:12:17		 Sala Sismica INGV-Roma 96672021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-17 05:05:09 ± 0.03
Latitude 42.7722 ± 0.0027
Longitude 12.7503 ± 0.0037
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 96756741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 352
Semi-minor axis of confidence ellipse (meter) 208
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 231
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) 68
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.13220
Epicentral distance of station farthest from the epicenter (degree) 0.46135
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 96756741
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-19 09:36:39

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 27
Type of magnitude ML
Reference to an origin 96672021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-17 05:12:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MMO1.EHZ. 2021-10-17T05:05:25.13 0.6 undecidable manual S 73 49.0176 50 0.16 46
IV.SMA1.EHZ. 2021-10-17T05:05:25.94 0.6 undecidable manual S 108 50.2164 50 0.63 40
IV.RM33.EHZ. 2021-10-17T05:05:24.79 0.6 undecidable manual S 127 47.8188 50 0.12 46
IV.MML1.EHZ. 2021-10-17T05:05:23.41 0.6 undecidable manual S 25 41.9247 50 0.32 45
IV.MC2.EHZ. 2021-10-17T05:05:22.34 0.1 undecidable manual S 66 38.8278 50 0.06 95
IV.ASSB.HHZ. 2021-10-17T05:05:20.12 0.6 undecidable manual S 346 30.9468 50 -0.04 49
IV.NRCA.HHZ. 2021-10-17T05:05:19.76 0.6 undecidable manual S 77 30.3474 50 -0.25 47
IV.LNSS.HHZ. 2021-10-17T05:05:19.76 0.1 undecidable manual S 128 30.1476 50 -0.2 94
IV.CESI.HHZ. 2021-10-17T05:05:19.37 0.6 undecidable manual S 26 28.6491 50 -0.19 47
IV.MMO1.EHZ. 2021-10-17T05:05:18.27 0.1 undecidable manual P 73 49.0176 50 -0.07 93
IV.SMA1.EHZ. 2021-10-17T05:05:18.67 0.6 negative manual P 108 50.2164 50 0.14 46
IV.CSP1.EHZ. 2021-10-17T05:05:18.83 0.1 undecidable manual P 46 51.2154 50 0.15 92
IV.RM33.EHZ. 2021-10-17T05:05:18.16 0.6 undecidable manual P 127 47.8188 50 0 47
IV.ARRO.EHZ. 2021-10-17T05:05:17.71 0.1 undecidable manual S 177 21.4674 116 0.17 96
IV.MML1.EHZ. 2021-10-17T05:05:17.13 1.0 negative manual P 25 41.9247 50 -0.12 23
IV.CESX.HHZ. 2021-10-17T05:05:17.72 0.1 undecidable manual S 216 22.5552 115 -0.16 96
IV.MC2.EHZ. 2021-10-17T05:05:16.77 0.1 undecidable manual P 66 38.8278 50 -0.02 96
IV.ASSB.HHZ. 2021-10-17T05:05:15.63 0.1 undecidable manual P 346 30.9468 50 0.07 97
IT.GNU.HGZ. 2021-10-17T05:05:15.66 0.1 undecidable manual S 284 15.0738 124 0.03 100
IV.CESI.HHZ. 2021-10-17T05:05:15.08 0.1 undecidable manual P 26 28.6491 50 -0.14 96
IV.NRCA.HHZ. 2021-10-17T05:05:15.25 0.1 undecidable manual P 77 30.3474 50 -0.23 94
IV.GAVE.EHZ. 2021-10-17T05:05:15.36 0.1 undecidable manual S 127 14.6742 125 -0.16 98
IV.LNSS.HHZ. 2021-10-17T05:05:15.31 0.1 undecidable manual P 128 30.1476 50 -0.14 95
IV.MOMA.HHZ. 2021-10-17T05:05:15.50 0.1 undecidable manual S 284 15.0738 124 -0.13 98
IV.CESX.HHZ. 2021-10-17T05:05:14.25 0.1 undecidable manual P 216 22.5552 115 0 99
IV.ARRO.EHZ. 2021-10-17T05:05:14.18 0.1 undecidable manual P 177 21.4674 116 0.13 97
IV.MOMA.HHZ. 2021-10-17T05:05:13.04 0.1 negative manual P 284 15.0738 124 0.09 99
IT.GNU.HGZ. 2021-10-17T05:05:13.05 0.1 undecidable manual P 284 15.0738 124 0.11 99
IV.GAVE.EHZ. 2021-10-17T05:05:12.96 0.1 undecidable manual P 127 14.6742 125 0.08 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.HNN. ML:1.2 0.00017193415 0.7168 AML other m 2021-10-17T05:05:14.48
IV.GAVE.EHN. ML:1.5 0.00032345765 0.1184 AML other m 2021-10-17T05:05:15.86
IV.GAVE.EHE. ML:1.5 0.00029740225 1.84 AML other m 2021-10-17T05:05:15.99
IV.MOMA.HHE. ML:1.6 0.00041600000000000003 0.28 AML other m 2021-10-17T05:05:16.20
IV.MOMA.HNE. ML:1.6 0.0004083714 0.2784 AML other m 2021-10-17T05:05:16.20
IV.GAVE.HNE. ML:1.5 0.00029667855 0.1504 AML other m 2021-10-17T05:05:16.32
IV.MOMA.HNN. ML:1.2 0.00014065823500000003 1.7792 AML other m 2021-10-17T05:05:16.92
IV.MOMA.HHN. ML:1.2 0.00014235000000000002 1.7792 AML other m 2021-10-17T05:05:16.92
IV.CESX.HHE. ML:1.1 0.00009126159 1.7216 AML other m 2021-10-17T05:05:18.90
IV.ARRO.EHN. ML:0.8 0.00004183994 0.2592 AML other m 2021-10-17T05:05:18.12
IV.CESX.HHN. ML:1.2 0.00011749624999999999 0.2784 AML other m 2021-10-17T05:05:19.75
IV.CESI.HHN. ML:1.2 0.0000844 0.32 AML other m 2021-10-17T05:05:19.76
IV.LNSS.HHE. ML:1.4 0.0001295 1.02 AML other m 2021-10-17T05:05:19.97
IV.LNSS.HHN. ML:1.2 0.0000839 0.82 AML other m 2021-10-17T05:05:20.46
IV.CESI.HHE. ML:1.1 0.00005915 0.58 AML other m 2021-10-17T05:05:20.72
IV.ASSB.HHE. ML:1.2 0.00006335000000000001 0.18 AML other m 2021-10-17T05:05:20.70
IV.NRCA.HHN. ML:1.1 0.00006745000000000001 1.06 AML other m 2021-10-17T05:05:20.78
IV.ARRO.EHE. ML:0.9 0.000048799999999999994 0.22 AML other m 2021-10-17T05:05:21.06
IV.ASSB.HHN. ML:1.1 0.000056149999999999996 1.36 AML other m 2021-10-17T05:05:21.10
IV.NRCA.HHE. ML:1.1 0.000059800000000000003 1.24 AML other m 2021-10-17T05:05:21.30
IV.MML1.EHN. ML:1.0 0.00003465 1.26 AML other m 2021-10-17T05:05:24.16
IV.MML1.EHE. ML:1.0 0.00003535 0.48 AML other m 2021-10-17T05:05:25.64
IV.RM33.EHE. ML:1.2 0.000041400000000000003 0.86 AML other m 2021-10-17T05:05:26.13
IV.RM33.EHN. ML:1.1 0.0000365 0.26 AML other m 2021-10-17T05:05:26.36
IV.SMA1.EHE. ML:1.4 0.00007085 1.56 AML other m 2021-10-17T05:05:27.97
IV.SMA1.EHN. ML:1.2 0.0000434 0.92 AML other m 2021-10-17T05:05:28.37
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