Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 27-10-2020 and time 04:01:14 (UTC) in region 5 km N Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 5 km N Norcia (PG), on

  • 27-10-2020 04:01:14 (UTC)
  • 27-10-2020 05:01:14 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8370, 13.0920 at 9 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
Norcia PG 5 4957 4957
Preci PG 6 724 5681
Castelsantangelo sul Nera MC 8 281 5962
Visso MC 11 1107 7069
Ussita MC 13 444 7513
Cerreto di Spoleto PG 14 1075 8588
Cascia PG 15 3217 11805
Sellano PG 15 1079 12884
Arquata del Tronto AP 18 1178 14062
Poggiodomo PG 19 117 14179
Monte Cavallo MC 19 145 14324
Montegallo AP 20 523 14847

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
54 Km W of Teramo (54892 inhabitants)
60 Km NW of L'Aquila (69753 inhabitants)
65 Km E of Perugia (166134 inhabitants)
93 Km NE of Viterbo (67173 inhabitants)
94 Km SW of Ancona (100861 inhabitants)
94 Km W of Montesilvano (53738 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
100 Km N of Tivoli (56533 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 0.9 2020-10-27
04:01:14		 42.837 13.0915 9 2021-02-26
14:56:06		 Bollettino Sismico Italiano INGV 84847611
Reviewed
Rev100 		ML 1.7 2020-10-27
04:01:14		 42.8318 13.0902 11 2020-10-27
04:06:50		 Sala Sismica INGV-Roma 84170031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-27 04:01:14 ± 0.06
Latitude 42.8370 ± 0.0027
Longitude 13.0915 ± 0.0049
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84847611

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 380
Semi-minor axis of confidence ellipse (meter) 217
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 73
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 30
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) 0.01709
Epicentral distance of station farthest from the epicenter (degree) 0.37772
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 84847611
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-19 13:41:57

ML:1.7

Field Value
Value 1.7
Uncertainty 0.0
Num. used stations 4
Type of magnitude ML
Reference to an origin 84170031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-27 04:06:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHN. 2020-10-27T04:01:28.32 0.6 undecidable manual S 303 41.9247 50 -0.14 47
IV.MF5.EHN. 2020-10-27T04:01:26.57 0.6 undecidable manual S 61 34.2435 50 0.15 48
IV.SMA1.EHZ. 2020-10-27T04:01:25.10 0.6 undecidable manual S 139 30.3474 106 -0.17 48
IV.PF6.EHN. 2020-10-27T04:01:25.94 0.6 undecidable manual S 14 34.4433 50 -0.51 44
IV.GUMA.HNN. 2020-10-27T04:01:25.86 0.6 undecidable manual S 38 31.9458 50 0.07 49
IV.MML1.HNE. 2020-10-27T04:01:25.61 0.6 undecidable manual S 342 32.1456 50 -0.25 47
IV.CSP1.EHZ. 2020-10-27T04:01:24.68 0.6 undecidable manual S 18 29.748 106 -0.39 46
IV.LNSS.HNZ. 2020-10-27T04:01:24.08 0.6 undecidable manual S 189 26.3514 108 0.14 48
IV.T1299.HNN. 2020-10-27T04:01:24.47 0.6 undecidable manual S 145 27.3504 108 0.19 48
IV.MTRA.EHE. 2020-10-27T04:01:23.63 0.6 undecidable manual S 110 26.3514 108 -0.33 47
IV.ASSB.HHN. 2020-10-27T04:01:22.53 0.1 undecidable manual P 303 41.9247 50 0.05 96
IV.FDMO.HHN. 2020-10-27T04:01:22.39 0.6 undecidable manual S 359 22.1556 112 -0.18 48
IV.CESI.HHZ. 2020-10-27T04:01:22.98 0.6 undecidable manual S 321 24.0537 110 -0.21 48
IV.MMO1.EHZ. 2020-10-27T04:01:21.76 0.6 undecidable manual S 70 20.3685 113 -0.24 48
IV.MF5.EHN. 2020-10-27T04:01:21.44 0.1 undecidable manual P 61 34.2435 50 0.14 95
IV.PF6.EHN. 2020-10-27T04:01:21.72 0.6 undecidable manual P 14 34.4433 50 0.4 45
IV.MML1.HNE. 2020-10-27T04:01:21.29 0.1 undecidable manual P 342 32.1456 50 0.31 92
IV.T1299.HNN. 2020-10-27T04:01:20.08 0.3 undecidable manual P 145 27.3504 108 0.02 74
IV.SMA1.EHZ. 2020-10-27T04:01:20.30 0.3 undecidable manual P 139 30.3474 106 -0.34 69
IV.CSP1.EHZ. 2020-10-27T04:01:20.41 1.0 undecidable manual P 18 29.748 106 -0.11 24
IV.GUMA.HNN. 2020-10-27T04:01:20.92 0.1 undecidable manual P 38 31.9458 50 -0.02 98
IV.FDMO.HHN. 2020-10-27T04:01:19.32 0.1 undecidable manual P 359 22.1556 112 0.24 95
IV.CESI.HHZ. 2020-10-27T04:01:19.19 0.1 undecidable manual P 321 24.0537 110 -0.25 95
IV.MC2.EHZ. 2020-10-27T04:01:19.65 0.3 undecidable manual S 44 11.4774 128 0.33 72
IV.MTRA.EHE. 2020-10-27T04:01:19.71 0.1 undecidable manual P 110 26.3514 108 -0.17 96
IV.LNSS.HNZ. 2020-10-27T04:01:19.82 0.3 undecidable manual P 189 26.3514 108 -0.05 74
IV.MMO1.EHZ. 2020-10-27T04:01:18.72 0.1 undecidable manual P 70 20.3685 113 -0.03 100
IV.NRCA.HHZ. 2020-10-27T04:01:17.31 0.3 undecidable manual S 102 1.8981 168 -0.12 76
IV.MC2.EHZ. 2020-10-27T04:01:17.54 0.1 negative manual P 44 11.4774 128 0.34 95
IV.NRCA.HHZ. 2020-10-27T04:01:16.35 0.1 undecidable manual P 102 1.8981 168 0.24 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.6 0.000023713255500000004 0.5408 AML other m 2020-10-27T04:01:23.65
IV.CSP1.EHN. ML:1.2 0.000074352315 0.8192 AML other m 2020-10-27T04:01:24.84
IV.CESI.HHN. ML:0.7 0.000028461924999999998 0.1792 AML other m 2020-10-27T04:01:24.68
IV.CSP1.EHE. ML:1.3 0.00009470695499999999 1.5424 AML other m 2020-10-27T04:01:25.44
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