Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 31-10-2021 and time 18:19:18 (Italy) in region 1 km NE Sigillo (PG)

A magnitude ML 1.0 earthquake occured in region: 1 km NE Sigillo (PG), on

  • 31-10-2021 17:19:18 (UTC)
  • 31-10-2021 18:19:18 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3410, 12.7560 at 14 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Sigillo PG 2 2404 2404
Costacciaro PG 4 1216 3620
Fossato di Vico PG 5 2840 6460
Scheggia e Pascelupo PG 10 1393 7853
Fabriano AN 12 31480 39333
Gualdo Tadino PG 12 15208 54541
Sassoferrato AN 14 7285 61826
Gubbio PG 14 32216 94042
Serra Sant'Abbondio PU 17 1027 95069
Genga AN 18 1797 96866
Cantiano PU 18 2245 99111
Esanatoglia MC 18 2034 101145
Cerreto d'Esi AN 19 3817 104962
Frontone PU 20 1300 106262

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km NE of Perugia (166134 inhabitants)
43 Km N of Foligno (57155 inhabitants)
60 Km SW of Fano (60888 inhabitants)
65 Km S of Pesaro (94582 inhabitants)
69 Km W of Ancona (100861 inhabitants)
72 Km E of Arezzo (99543 inhabitants)
82 Km S of Rimini (147750 inhabitants)
87 Km N of Terni (111501 inhabitants)
98 Km SE of Cesena (96758 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
Reviewed
Rev100 		ML 1.0 2021-10-31
17:19:18		 43.3407 12.7557 14 2021-10-31
17:42:20		 Sala Sismica INGV-Roma 97116151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-31 17:19:18 ± 0.05
Latitude 43.3407 ± 0.0027
Longitude 12.7557 ± 0.0037
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97116151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 290
Semi-minor axis of confidence ellipse (meter) 28
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 241
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 51
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.04587
Epicentral distance of station farthest from the epicenter (degree) 0.30577
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 97116151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-31 17:42:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-10-31T17:19:29.44 0.6 undecidable manual S 92 27.9498 102 0.47 45
IV.ATVO.HHZ. 2021-10-31T17:19:29.23 0.6 undecidable manual S 279 28.5492 101 0.11 47
IV.PIEI.HHZ. 2021-10-31T17:19:28.97 0.6 undecidable manual S 321 27.9498 101 -0.01 49
IV.MURB.HHZ. 2021-10-31T17:19:27.45 0.6 undecidable manual S 245 20.5683 109 0.39 46
IV.ARVD.HHZ. 2021-10-31T17:19:27.88 0.6 undecidable manual S 41 22.9548 106 0.19 48
IV.ATCC.EHZ. 2021-10-31T17:19:27.00 0.6 undecidable manual S 208 19.6692 111 0.17 48
IV.SNTG.HHZ. 2021-10-31T17:19:26.41 0.6 undecidable manual S 122 17.6712 114 0.05 50
IV.FRON.EHZ. 2021-10-31T17:19:26.85 0.6 undecidable manual S 353 19.7691 111 -0.02 50
IV.ASSB.HHZ. 2021-10-31T17:19:25.44 0.6 undecidable manual P 193 33.9438 98 -0.22 46
IV.ATFO.HHZ. 2021-10-31T17:19:25.76 0.6 undecidable manual S 281 15.1737 120 0.01 50
IV.NARO.HHZ. 2021-10-31T17:19:25.41 0.6 undecidable manual P 335 33.1446 99 -0.12 48
IV.PIEI.HHZ. 2021-10-31T17:19:24.62 0.6 undecidable manual P 321 27.9498 101 -0.13 48
IV.ATVO.HHZ. 2021-10-31T17:19:24.76 0.3 negative manual P 279 28.5492 101 -0.07 73
IV.EL6.EHZ. 2021-10-31T17:19:24.82 0.3 negative manual P 92 27.9498 102 0.08 73
IV.ARVD.HHZ. 2021-10-31T17:19:24.01 0.1 negative manual P 41 22.9548 106 0.01 99
IV.MML1.EHZ. 2021-10-31T17:19:24.80 0.6 undecidable manual P 145 30.6471 100 -0.35 45
IV.FRON.EHZ. 2021-10-31T17:19:23.44 0.3 undecidable manual P 353 19.7691 111 -0.09 73
IV.ATCC.EHZ. 2021-10-31T17:19:23.47 0.1 positive manual P 208 19.6692 111 -0.04 99
IV.MURB.HHZ. 2021-10-31T17:19:23.64 1.0 undecidable manual P 245 20.5683 109 0 25
IV.SNTG.HHZ. 2021-10-31T17:19:23.28 1.0 undecidable manual P 122 17.6712 114 0.05 25
IV.FOSV.EHZ. 2021-10-31T17:19:23.82 0.6 undecidable manual S 175 5.0949 156 -0.11 49
IV.ATFO.HHZ. 2021-10-31T17:19:22.85 0.1 positive manual P 281 15.1737 120 -0.03 100
IV.FOSV.EHZ. 2021-10-31T17:19:21.76 0.1 positive manual P 175 5.0949 156 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FOSV.EHE. ML:1.1 0.00014549999999999999 0.28 AML other m 2021-10-31T17:19:23.95
IV.FOSV.EHN. ML:1.1 0.0001455 0.24 AML other m 2021-10-31T17:19:23.85
IV.ATFO.HHN. ML:0.9 0.00006625 0.36 AML other m 2021-10-31T17:19:25.75
IV.ATFO.HHE. ML:0.8 0.000057300000000000004 0.82 AML other m 2021-10-31T17:19:26.79
IV.ATCC.EHN. ML:1.1 0.00008155 0.52 AML other m 2021-10-31T17:19:27.32
IV.FRON.EHN. ML:1.0 0.0000652 0.14 AML other m 2021-10-31T17:19:27.14
IV.FRON.EHE. ML:1.0 0.00007515 0.38 AML other m 2021-10-31T17:19:27.03
IV.MURB.HHE. ML:1.2 0.00010614999999999999 0.4 AML other m 2021-10-31T17:19:27.61
IV.ATCC.EHE. ML:1.2 0.00011304999999999998 1.44 AML other m 2021-10-31T17:19:27.13
IV.PIEI.HHN. ML:0.6 0.00002225 0.8 AML other m 2021-10-31T17:19:28.43
IV.MURB.HHN. ML:1.1 0.0000885 1.04 AML other m 2021-10-31T17:19:28.75
IV.PIEI.HHE. ML:0.9 0.00003515 0.36 AML other m 2021-10-31T17:19:29.29
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