Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 21-09-2021 and time 01:52:08 (Italy) in region 1 km W Sigillo (PG)

A magnitude ML 0.4 earthquake occured in region: 1 km W Sigillo (PG), on

  • 20-09-2021 23:52:08 (UTC)
  • 21-09-2021 01:52:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.3300, 12.7350 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 1 2404 2404
Costacciaro PG 4 1216 3620
Fossato di Vico PG 4 2840 6460
Scheggia e Pascelupo PG 10 1393 7853
Gualdo Tadino PG 12 15208 23061
Gubbio PG 13 32216 55277
Fabriano AN 14 31480 86757
Sassoferrato AN 16 7285 94042
Serra Sant'Abbondio PU 18 1027 95069
Cantiano PU 18 2245 97314
Esanatoglia MC 19 2034 99348
Genga AN 20 1797 101145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km NE of Perugia (166134 inhabitants)
42 Km N of Foligno (57155 inhabitants)
62 Km SW of Fano (60888 inhabitants)
66 Km S of Pesaro (94582 inhabitants)
71 Km E of Arezzo (99543 inhabitants)
71 Km W of Ancona (100861 inhabitants)
83 Km S of Rimini (147750 inhabitants)
86 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 0.4 2021-09-20
23:52:08		 43.3297 12.7352 14 2021-09-21
00:12:53		 Sala Sismica INGV-Roma 95678421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 23:52:08 ± 0.07
Latitude 43.3297 ± 0.0018
Longitude 12.7352 ± 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 95678421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 299
Semi-minor axis of confidence ellipse (meter) 78
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 85
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.10072
Epicentral distance of station farthest from the epicenter (degree) 0.30217
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 95678421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-21 00:12:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NARO.HHZ. 2021-09-20T23:52:20.26 0.3 undecidable manual S 338 33.5442 97 0.06 72
IV.ATCC.EHZ. 2021-09-20T23:52:16.15 0.3 undecidable manual S 206 17.7711 112 0.05 74
IV.SNTG.HNN. 2021-09-20T23:52:16.23 0.3 undecidable manual S 116 18.5703 111 -0.06 74
IV.MURB.HHZ. 2021-09-20T23:52:16.28 0.3 undecidable manual S 247 18.5703 111 0 74
IV.FRON.EHZ. 2021-09-20T23:52:16.83 0.3 undecidable manual S 358 20.868 107 -0.05 73
IV.NARO.HHZ. 2021-09-20T23:52:15.20 0.1 undecidable manual P 338 33.5442 97 -0.15 94
IV.ATFO.HHZ. 2021-09-20T23:52:14.91 0.3 undecidable manual S 287 13.875 122 -0.25 71
IV.SSFR.HNE. 2021-09-20T23:52:14.98 0.3 undecidable manual S 18 12.3765 126 0.13 74
IV.ATSC.EHE. 2021-09-20T23:52:14.59 0.3 undecidable manual S 339 11.1777 130 0.01 75
IV.FRON.EHZ. 2021-09-20T23:52:13.42 0.1 undecidable manual P 358 20.868 107 -0.01 99
IV.ATCC.EHZ. 2021-09-20T23:52:13.06 0.1 undecidable manual P 206 17.7711 112 0.08 97
IV.MURB.HHZ. 2021-09-20T23:52:13.26 0.1 undecidable manual P 247 18.5703 111 0.16 96
IV.ATSC.EHE. 2021-09-20T23:52:12.14 0.1 undecidable manual P 339 11.1777 130 0.03 100
IV.ATFO.HHZ. 2021-09-20T23:52:12.42 0.1 undecidable manual P 287 13.875 122 -0.02 99
IV.SNTG.HNN. 2021-09-20T23:52:12.89 0.1 undecidable manual P 116 18.5703 111 -0.2 96
IV.SSFR.HNE. 2021-09-20T23:52:12.44 0.1 undecidable manual P 18 12.3765 126 0.18 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATFO.HHE. ML:0.5 0.000023512165000000003 0.192 AML other m 2021-09-20T23:52:15.17
IV.ATFO.HHN. ML:0.2 0.000015896819999999998 0.1024 AML other m 2021-09-20T23:52:15.03
IV.MURB.HHE. ML:0.7 0.00003712844 0.256 AML other m 2021-09-20T23:52:16.76
IV.MURB.HHN. ML:0.6 0.000032101484999999996 0.2816 AML other m 2021-09-20T23:52:16.49
IV.FRON.EHE. ML:0.2 0.000011989463 0.064 AML other m 2021-09-20T23:52:17.40
IV.FRON.EHN. ML:0.4 0.00001309869 0.1408 AML other m 2021-09-20T23:52:17.26
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