Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 27-11-2020 and time 15:37:46 (UTC) in region 2 km E Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 2 km E Norcia (PG), on

  • 27-11-2020 15:37:46 (UTC)
  • 27-11-2020 16:37:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8, 13.12 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 3 4957 4957
Castelsantangelo sul Nera MC 11 281 5238
Preci PG 11 724 5962
Cascia PG 13 3217 9179
Arquata del Tronto AP 15 1178 10357
Visso MC 15 1107 11464
Accumoli RI 16 667 12131
Ussita MC 16 444 12575
Cerreto di Spoleto PG 17 1075 13650
Montegallo AP 18 523 14173
Poggiodomo PG 18 117 14290
Sellano PG 19 1079 15369

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
69 Km SE of Perugia (166134 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
97 Km N of Tivoli (56533 inhabitants)
97 Km W of Pescara (121014 inhabitants)
99 Km NW of Chieti (51815 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 0.9 2020-11-27
15:37:46		 42.8 13.12 11 2020-11-27
15:44:01		 Sala Sismica INGV-Roma 85052871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-11-27 15:37:46 ± 0.06
Latitude 42.80 ± 0.00
Longitude 13.12 ± 0.00
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 85052871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 431
Semi-minor axis of confidence ellipse (meter) 321
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 54
Circular confidence region, given by single value of horizontal uncertainty (meter) 430
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 25
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.40469
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 16
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 85052871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-11-27 15:44:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MGAB.HHZ. 2020-11-27T15:38:09.34 3.0 undecidable manual S -0.11 0
IV.CAMP.HHE. 2020-11-27T15:37:58.93 0.6 undecidable manual S 141 0.3399 50 0.06 47
IV.CSP1.EHZ. 2020-11-27T15:37:57.51 0.6 undecidable manual S 12 0.2959 50 -0.07 47
IV.CESI.HHZ. 2020-11-27T15:37:56.23 0.6 undecidable manual S 322 0.2581 50 -0.22 46
IV.MOMA.HHE. 2020-11-27T15:37:54.90 0.6 undecidable manual P 270 0.4047 50 0.25 44
IV.MTRA.EHN. 2020-11-27T15:37:54.78 0.6 undecidable manual S 102 0.2068 50 -0.15 47
IV.LNSS.HHZ. 2020-11-27T15:37:54.70 0.6 undecidable manual S 197 0.2077 50 -0.26 46
IV.TERO.HHZ. 2020-11-27T15:37:54.43 0.3 undecidable manual P 117 0.3966 50 -0.09 69
IV.MMO1.EHZ. 2020-11-27T15:37:53.87 0.3 undecidable manual S 57 0.179 118 -0.2 70
IV.CAMP.HHE. 2020-11-27T15:37:53.27 0.1 undecidable manual P 141 0.3399 50 -0.27 90
IV.GUMA.HHZ. 2020-11-27T15:37:53.31 0.3 positive manual P 31 0.304 50 0.38 66
IV.CESI.HHZ. 2020-11-27T15:37:52.00 0.1 undecidable manual P 322 0.2581 50 -0.14 94
IV.CSP1.EHZ. 2020-11-27T15:37:52.78 0.1 undecidable manual P 12 0.2959 50 -0.01 96
IV.MC2.EHZ. 2020-11-27T15:37:52.41 0.3 undecidable manual S 24 0.1205 129 0.24 71
IV.FDMO.HHZ. 2020-11-27T15:37:51.69 0.3 undecidable manual P 354 0.2356 50 -0.07 72
IT.MTCL.HGZ. 2020-11-27T15:37:51.32 0.1 undecidable manual P 335 0.2122 50 -0.03 97
IV.MTRA.EHN. 2020-11-27T15:37:51.17 0.1 undecidable manual P 102 0.2068 50 -0.09 96
IV.SMA1.EHZ. 2020-11-27T15:37:51.98 0.3 undecidable manual P 137 0.232 50 0.28 69
IV.LNSS.HHZ. 2020-11-27T15:37:51.32 0.1 undecidable manual P 197 0.2077 50 0.04 97
IV.T1299.EHN. 2020-11-27T15:37:51.55 0.1 undecidable manual P 145 0.205 50 0.32 91
IV.MMO1.EHZ. 2020-11-27T15:37:50.62 0.1 undecidable manual P 57 0.179 118 -0.15 95
IV.FEMA.HNZ. 2020-11-27T15:37:50.65 0.1 undecidable manual P 342 0.1691 120 0.09 96
IV.MC2.EHZ. 2020-11-27T15:37:49.86 0.1 undecidable manual P 24 0.1205 129 0.19 95
IV.NRCA.HHZ. 2020-11-27T15:37:49.70 0.6 undecidable manual S 350 0.0324 161 -0.44 46
IV.NRCA.HHZ. 2020-11-27T15:37:48.53 0.1 undecidable manual P 350 0.0324 161 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.9 0.001225 0.16 AML other m 2020-11-27T15:37:49.82
IV.NRCA.HNE. ML:1.9 0.0012 0.16 AML other m 2020-11-27T15:37:49.82
IV.NRCA.HNN. ML:1.8 0.001125 0.08 AML other m 2020-11-27T15:37:49.86
IV.NRCA.HHN. ML:1.9 0.001345 0.08 AML other m 2020-11-27T15:37:49.82
IV.LNSS.HHE. ML:1 6.97E-5 0.14 AML other m 2020-11-27T15:37:55.25
IV.LNSS.HHN. ML:1 6.485E-5 0.66 AML other m 2020-11-27T15:37:56.57
IV.CESI.HHE. ML:0.8 3.495E-5 0.56 AML other m 2020-11-27T15:37:56.95
IV.LNSS.HNE. ML:0.8 4.7070579E-5 0.2816 AML other m 2020-11-27T15:37:54.53
IV.LNSS.HNN. ML:1.2 0.00010023245 0.96 AML other m 2020-11-27T15:37:55.04
IV.FDMO.HHE. ML:0.6 2.1558305E-5 0.1408 AML other m 2020-11-27T15:37:57.08
IV.CESI.HHN. ML:0.8 3.417636E-5 0.256 AML other m 2020-11-27T15:37:57.31
IV.CSP1.EHE. ML:0.8 2.543493E-5 0.9984 AML other m 2020-11-27T15:37:58.02
IV.CSP1.EHN. ML:0.9 3.634371235E-5 0.2432 AML other m 2020-11-27T15:37:57.87
IV.TERO.HHE. ML:0.5 1.06235635E-5 0.064 AML other m 2020-11-27T15:38:01.15
IV.TERO.HHN. ML:0.8 1.996621E-5 0.0768 AML other m 2020-11-27T15:38:01.11
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download