Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 16-10-2020 and time 18:40:25 (UTC) in region 2 km E Sellano (PG)

A magnitude ML 0.4 earthquake occured in region: 2 km E Sellano (PG), on

  • 16-10-2020 18:40:25 (UTC)
  • 16-10-2020 20:40:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8980, 12.9470 at 8 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
Sellano PG 2 1079 1079
Preci PG 8 724 1803
Cerreto di Spoleto PG 9 1075 2878
Monte Cavallo MC 12 145 3023
Visso MC 12 1107 4130
Vallo di Nera PG 16 364 4494
Campello sul Clitunno PG 16 2442 6936
Trevi PG 16 8469 15405
Ussita MC 17 444 15849
Norcia PG 17 4957 20806
Castelsantangelo sul Nera MC 17 281 21087
Pieve Torina MC 19 1458 22545
Fiordimonte MC 20 202 22747
Serravalle di Chienti MC 20 1070 23817

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km E of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
51 Km E of Perugia (166134 inhabitants)
67 Km W of Teramo (54892 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
87 Km NE of Viterbo (67173 inhabitants)
93 Km SW of Ancona (100861 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 2020-10-16
18:40:25		 42.8977 12.9473 8 2020-10-16
18:51:11		 Sala Sismica INGV-Roma 83825251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-16 18:40:25 ± 0.14
Latitude 42.8977 ± 0.0054
Longitude 12.9473 ± 0.0086
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83825251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 628
Semi-minor axis of confidence ellipse (meter) 460
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 289
Circular confidence region, given by single value of horizontal uncertainty (meter) 630.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 73
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.39210
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 10
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 83825251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-16 18:51:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NARO.HHZ. 2020-10-16T18:40:42.24 3.0 undecidable manual P 0 0
IV.CRTC.HHZ. 2020-10-16T18:40:42.28 3.0 undecidable manual P -1.9 0
IV.MML1.HNZ. 2020-10-16T18:40:34.67 0.6 undecidable manual S 5 24.0537 109 -0.09 48
IV.MC2.EHZ. 2020-10-16T18:40:34.22 0.6 undecidable manual S 85 19.6692 113 0.85 39
IV.GAVE.HNZ. 2020-10-16T18:40:34.29 0.6 undecidable manual S 191 23.1546 110 -0.21 47
IV.CESX.HHE. 2020-10-16T18:40:34.36 0.1 undecidable manual P 223 43.5231 50 -0.05 94
IV.MOMA.HHZ. 2020-10-16T18:40:32.58 0.1 undecidable manual P 251 32.4453 105 -0.06 96
IV.NRCA.HHZ. 2020-10-16T18:40:32.01 0.6 undecidable manual S 118 15.3735 119 0.01 50
IV.ASSB.HHZ. 2020-10-16T18:40:32.71 0.1 undecidable manual P 305 28.4493 106 0.84 77
IV.FDMO.HHZ. 2020-10-16T18:40:32.81 0.6 undecidable manual S 36 19.1697 114 -0.38 46
IV.CESI.HHZ. 2020-10-16T18:40:31.10 0.6 undecidable manual S 344 12.3765 124 -0.03 50
IV.GAVE.HNZ. 2020-10-16T18:40:30.74 0.1 undecidable manual P 191 23.1546 110 -0.14 96
IV.MML1.HNZ. 2020-10-16T18:40:30.68 0.1 undecidable manual P 5 24.0537 109 -0.36 91
IT.MTCL.HGZ. 2020-10-16T18:40:30.87 0.6 undecidable manual S 22 11.4774 126 0 50
IV.MC2.EHZ. 2020-10-16T18:40:30.51 0.1 undecidable manual P 85 19.6692 113 0.28 94
IV.FDMO.HHZ. 2020-10-16T18:40:29.90 0.1 undecidable manual P 36 19.1697 114 -0.22 95
IV.NRCA.HHZ. 2020-10-16T18:40:29.28 0.1 undecidable manual P 118 15.3735 119 -0.16 97
IV.CESI.HHZ. 2020-10-16T18:40:28.88 0.1 undecidable manual P 344 12.3765 124 -0.05 99
IT.MTCL.HGZ. 2020-10-16T18:40:28.81 0.1 undecidable manual P 22 11.4774 126 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.7 0.000050199999999999994 0.62 AML other m 2020-10-16T18:40:33.43
IV.CESI.HHE. ML:0.4 0.000029038390000000002 0.128 AML other m 2020-10-16T18:40:31.29
IV.CESI.HHN. ML:0.5 0.000040949415000000006 0.0768 AML other m 2020-10-16T18:40:31.37
IV.FDMO.HHE. ML:0.4 0.00002170368 0.256 AML other m 2020-10-16T18:40:33.17
IV.FDMO.HHN. ML:0.1 0.0000086144145 0.2944 AML other m 2020-10-16T18:40:32.93
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