Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 17-10-2021 and time 01:51:15 (UTC) in region 3 km E Sellano (PG)

A magnitude ML 0.6 earthquake occured in region: 3 km E Sellano (PG), on

  • 17-10-2021 01:51:15 (UTC)
  • 17-10-2021 03:51:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8790, 12.9640 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
Sellano PG 3 1079 1079
Preci PG 6 724 1803
Cerreto di Spoleto PG 8 1075 2878
Visso MC 12 1107 3985
Monte Cavallo MC 13 145 4130
Norcia PG 14 4957 9087
Vallo di Nera PG 15 364 9451
Castelsantangelo sul Nera MC 16 281 9732
Ussita MC 16 444 10176
Campello sul Clitunno PG 17 2442 12618
Trevi PG 18 8469 21087
Cascia PG 18 3217 24304
Poggiodomo PG 19 117 24421
Sant'Anatolia di Narco PG 19 564 24985
Pieve Torina MC 20 1458 26443

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km E of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
53 Km E of Perugia (166134 inhabitants)
65 Km W of Teramo (54892 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
87 Km NE of Viterbo (67173 inhabitants)
94 Km SW of Ancona (100861 inhabitants)
100 Km N of Guidonia Montecelio (88673 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 0.6 2021-10-17
01:51:15		 42.8793 12.9642 11 2022-03-30
13:04:12		 Bollettino Sismico Italiano INGV 96724771
Reviewed
Rev100 		ML 0.6 2021-10-17
01:51:16		 42.8893 12.9815 10 2021-10-17
01:58:35		 Sala Sismica INGV-Roma 96667551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-17 01:51:15 ± 0.08
Latitude 42.8793 ± 0.0036
Longitude 12.9642 ± 0.0061
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 96724771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 529
Semi-minor axis of confidence ellipse (meter) 385
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 267
Circular confidence region, given by single value of horizontal uncertainty (meter) 530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 146
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.11871
Epicentral distance of station farthest from the epicenter (degree) 0.27609
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 96667551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-17 01:58:35

ML:0.6

Field Value
Value 0.6
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 96724771
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-18 12:08:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-10-17T01:51:26.72 0.6 undecidable manual S 40 30.6471 90 0.14 48
IV.MMO1.HNE. 2021-10-17T01:51:26.38 0.1 undecidable manual S 86 29.5482 90 0.08 97
IV.GAVE.EHN. 2021-10-17T01:51:24.39 0.1 undecidable manual S 195 21.5673 90 0.24 94
IV.FDMO.HHZ. 2021-10-17T01:51:23.62 0.3 undecidable manual S 30 20.0688 91 -0.16 72
IV.CESI.HHZ. 2021-10-17T01:51:22.37 0.3 undecidable manual S 341 14.7741 93 0.02 74
IV.CSP1.EHZ. 2021-10-17T01:51:22.30 0.1 undecidable manual P 40 30.6471 90 0.21 94
IV.NRCA.HHZ. 2021-10-17T01:51:21.82 0.1 undecidable manual S 113 13.1757 100 -0.12 100
IV.MMO1.HNE. 2021-10-17T01:51:21.78 0.1 undecidable manual P 86 29.5482 90 -0.15 96
IV.MML1.HNE. 2021-10-17T01:51:21.13 0.1 undecidable manual P 1 25.9518 90 -0.25 94
IV.GAVE.EHN. 2021-10-17T01:51:20.33 0.1 undecidable manual P 195 21.5673 90 -0.36 94
IV.FDMO.HHZ. 2021-10-17T01:51:20.47 0.1 undecidable manual P 30 20.0688 91 0 100
IV.NRCA.HHZ. 2021-10-17T01:51:19.56 0.1 undecidable manual P 113 13.1757 100 0.15 97
IV.CESI.HHZ. 2021-10-17T01:51:19.82 0.1 undecidable manual P 341 14.7741 93 0.17 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HNN. ML:1.1 0.00012095949 0.74 AML other m 2021-10-17T01:51:20.12
IV.NRCA.HHN. ML:0.4 0.00002694769 1.86 AML other m 2021-10-17T01:51:21.96
IV.NRCA.HHE. ML:0.3 0.0000191420415 0.08 AML other m 2021-10-17T01:51:22.13
IV.CESI.HHN. ML:0.2 0.0000136640915 0.14 AML other m 2021-10-17T01:51:22.60
IV.FDMO.HHE. ML:0.6 0.00002715 1.18 AML other m 2021-10-17T01:51:24.74
IV.FDMO.HHN. ML:0.6 0.00002615 0.62 AML other m 2021-10-17T01:51:24.73
IV.CESI.HNE. ML:1.1 0.000109874335 0.7 AML other m 2021-10-17T01:51:25.52
IV.CESI.HHE. ML:0.3 0.000021517165 1.22 AML other m 2021-10-17T01:51:31.86
IV.CSP1.EHE. ML:1.2 0.000071799055 0.24 AML other m 2021-10-17T01:51:32.47
IV.CSP1.EHN. ML:1.1 0.000056515025 0.4 AML other m 2021-10-17T01:51:37.48
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