Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 01-10-2020 and time 17:50:54 (UTC) in region 1 km N Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 1 km N Norcia (PG), on

  • 01-10-2020 17:50:54 (UTC)
  • 01-10-2020 19:50:54 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8020, 13.0920 at 11 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
Norcia PG 1 4957 4957
Preci PG 10 724 5681
Cascia PG 11 3217 8898
Castelsantangelo sul Nera MC 12 281 9179
Cerreto di Spoleto PG 14 1075 10254
Visso MC 15 1107 11361
Poggiodomo PG 16 117 11478
Ussita MC 16 444 11922
Sellano PG 17 1079 13001
Arquata del Tronto AP 17 1178 14179
Accumoli RI 17 667 14846
Vallo di Nera PG 19 364 15210

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km E of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
53 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
67 Km SE of Perugia (166134 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
99 Km W of Pescara (121014 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 0.9 2020-10-01
17:50:54		 42.8017 13.0923 11 2020-10-01
17:57:59		 Sala Sismica INGV-Roma 83420421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-01 17:50:54 ± 0.05
Latitude 42.8017 ± 0.0018
Longitude 13.0923 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83420421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 361
Semi-minor axis of confidence ellipse (meter) 243
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 82
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
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) 0.03597
Epicentral distance of station farthest from the epicenter (degree) 0.41639
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:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 83420421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-01 17:57:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2020-10-01T17:51:09.37 0.6 undecidable manual S 115 46.2204 50 -0.3 63
IV.CSP1.EHZ. 2020-10-01T17:51:06.40 0.6 undecidable manual S 16 33.4443 50 0.12 63
IV.RM33.EHZ. 2020-10-01T17:51:06.24 0.6 undecidable manual S 163 33.9438 50 -0.17 66
IV.CESI.HHZ. 2020-10-01T17:51:04.17 0.3 undecidable manual S 326 27.2505 50 -0.44 94
IV.FDMO.HHZ. 2020-10-01T17:51:04.12 0.6 undecidable manual S 359 26.0517 50 -0.18 66
IV.SMA1.EHZ. 2020-10-01T17:51:04.22 0.6 undecidable manual S 134 27.4503 50 -0.45 63
IV.LNSS.HHZ. 2020-10-01T17:51:03.27 0.6 undecidable manual S 191 22.4553 50 -0.07 67
IV.T1299.HNZ. 2020-10-01T17:51:03.75 0.3 undecidable manual S 140 24.1536 50 -0.05 100
IV.TERO.HHZ. 2020-10-01T17:51:03.30 0.6 undecidable manual P 115 46.2204 50 -0.09 65
IV.MMO1.EHZ. 2020-10-01T17:51:03.27 0.6 undecidable manual S 60 21.9669 50 0.07 65
IV.MTRA.EHZ. 2020-10-01T17:51:03.64 0.6 undecidable manual S 101 25.2525 50 -0.45 63
IV.GAVE.EHZ. 2020-10-01T17:51:02.70 0.6 undecidable manual S 233 20.1687 50 -0.04 67
IV.MC2.EHZ. 2020-10-01T17:51:01.12 0.6 undecidable manual S 33 14.4744 127 0.05 68
IV.CSP1.EHZ. 2020-10-01T17:51:01.42 1.0 undecidable manual P 16 33.4443 50 -0.01 33
IV.RM33.EHZ. 2020-10-01T17:51:01.69 1.0 positive manual P 163 33.9438 50 0.18 31
IV.MTRA.EHZ. 2020-10-01T17:51:00.50 0.6 positive manual P 101 25.2525 50 0.33 62
IV.CESI.HHZ. 2020-10-01T17:51:00.53 0.6 negative manual P 326 27.2505 50 0.06 65
IV.T1299.HNZ. 2020-10-01T17:51:00.21 1.0 undecidable manual P 140 24.1536 50 0.21 32
IV.FDMO.HHZ. 2020-10-01T17:51:00.34 0.6 negative manual P 359 26.0517 50 0.05 66
IV.SMA1.EHZ. 2020-10-01T17:51:00.45 0.6 negative manual P 134 27.4503 50 -0.05 67
IV.MMO1.EHZ. 2020-10-01T17:50:59.49 1.0 negative manual P 60 21.9669 50 -0.17 33
IV.LNSS.HHZ. 2020-10-01T17:50:59.77 1.0 undecidable manual P 191 22.4553 50 0.03 33
IV.GAVE.EHZ. 2020-10-01T17:50:59.45 0.3 positive manual P 233 20.1687 50 0.06 99
IV.NRCA.HHZ. 2020-10-01T17:50:58.64 0.6 undecidable manual S 27 3.996 160 -0.14 67
IV.MC2.EHZ. 2020-10-01T17:50:58.61 0.6 positive manual P 33 14.4744 127 0.18 66
IV.NRCA.HHZ. 2020-10-01T17:50:57.18 0.6 undecidable manual P 27 3.996 160 0.07 69
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.6 0.000623 0.08 AML other m 2020-10-01T17:50:58.69
IV.NRCA.HHN. ML:1.2 0.00023299999999999997 1.82 AML other m 2020-10-01T17:50:58.07
IV.LNSS.HHN. ML:0.9 0.0000533 0.2 AML other m 2020-10-01T17:51:03.92
IV.LNSS.HHE. ML:1.0 0.00005830000000000001 0.14 AML other m 2020-10-01T17:51:04.15
IV.FDMO.HHE. ML:0.6 0.000024050000000000002 1.04 AML other m 2020-10-01T17:51:04.79
IV.CESI.HHN. ML:0.9 0.00004365 0.36 AML other m 2020-10-01T17:51:04.80
IV.CESI.HHE. ML:0.7 0.00002415 0.24 AML other m 2020-10-01T17:51:04.82
IV.FDMO.HHN. ML:0.6 0.0000249 1.12 AML other m 2020-10-01T17:51:04.27
IV.TERO.HHN. ML:0.8 0.000022 0.76 AML other m 2020-10-01T17:51:10.48
IV.TERO.HHE. ML:0.7 0.00001345 1.36 AML other m 2020-10-01T17:51:10.95
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