Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 23-11-2020 and time 21:34:36 (Italy) in region 6 km W Norcia (PG)

A magnitude ML 1.0 earthquake occured in region: 6 km W Norcia (PG), on

  • 23-11-2020 20:34:36 (UTC)
  • 23-11-2020 21:34:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7970, 13.0250 at 10 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 6 4957 4957
Cascia PG 9 3217 8174
Preci PG 9 724 8898
Cerreto di Spoleto PG 9 1075 9973
Poggiodomo PG 12 117 10090
Sellano PG 13 1079 11169
Vallo di Nera PG 14 364 11533
Castelsantangelo sul Nera MC 15 281 11814
Visso MC 16 1107 12921
Sant'Anatolia di Narco PG 17 564 13485
Monteleone di Spoleto PG 17 599 14084
Scheggino PG 18 461 14545
Ussita MC 19 444 14989

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SE of Foligno (57155 inhabitants)
41 Km NE of Terni (111501 inhabitants)
58 Km W of Teramo (54892 inhabitants)
58 Km NW of L'Aquila (69753 inhabitants)
62 Km SE of Perugia (166134 inhabitants)
86 Km E of Viterbo (67173 inhabitants)
92 Km N of Guidonia Montecelio (88673 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
97 Km W of Montesilvano (53738 inhabitants)
100 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 1.0 2020-11-23
20:34:36		 42.7972 13.0252 10 2020-11-23
22:21:01		 Sala Sismica INGV-Roma 84970121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-11-23 20:34:36 ± 0.05
Latitude 42.7972 ± 0.0018
Longitude 13.0252 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84970121

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 299
Semi-minor axis of confidence ellipse (meter) 164
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 69
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 61
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
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) 0.07464
Epicentral distance of station farthest from the epicenter (degree) 0.36333
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.4
Num. used stations 14
Type of magnitude ML
Reference to an origin 84970121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-11-23 22:21:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2020-11-23T20:34:50.06 0.1 undecidable manual S 313 40.3263 50 0.04 96
IV.MOMA.HHZ. 2020-11-23T20:34:49.38 0.3 undecidable manual S 271 37.0296 50 0.24 69
IV.CSP1.EHZ. 2020-11-23T20:34:48.76 0.1 undecidable manual S 24 35.8419 50 -0.06 96
IV.SMA1.EHZ. 2020-11-23T20:34:48.00 0.3 undecidable manual S 126 31.3464 50 0.38 68
IV.T1299.HNZ. 2020-11-23T20:34:46.65 0.1 undecidable manual S 131 27.6501 50 0.01 99
IV.MMO1.EHZ. 2020-11-23T20:34:46.17 0.1 undecidable manual S 65 27.0507 50 -0.3 93
IV.FDMO.HHZ. 2020-11-23T20:34:46.22 0.1 undecidable manual S 11 27.0507 50 -0.25 94
IV.CESI.HHZ. 2020-11-23T20:34:45.78 0.1 undecidable manual S 337 25.0527 112 -0.15 96
IV.MC2.EHZ. 2020-11-23T20:34:44.21 0.1 undecidable manual S 46 18.3705 119 0.37 93
IT.MTCL.HGZ. 2020-11-23T20:34:44.81 0.3 undecidable manual S 355 21.9669 115 -0.13 73
IV.LNSS.HHZ. 2020-11-23T20:34:44.48 0.1 undecidable manual S 177 21.5673 115 -0.35 93
IV.ASSB.HHZ. 2020-11-23T20:34:44.28 0.1 undecidable manual P 313 40.3263 50 -0.06 96
IV.FEMA.HNZ. 2020-11-23T20:34:43.85 0.3 undecidable manual S 6 18.3705 119 0 75
IV.SMA1.EHZ. 2020-11-23T20:34:43.09 0.1 undecidable manual P 126 31.3464 50 0.15 95
IV.CSP1.EHZ. 2020-11-23T20:34:43.68 0.1 undecidable manual P 24 35.8419 50 0.04 97
IV.ARRO.EHZ. 2020-11-23T20:34:43.04 0.3 undecidable manual P 221 32.1456 50 -0.03 73
IV.MOMA.HHZ. 2020-11-23T20:34:43.88 0.3 undecidable manual P 271 37.0296 50 0.05 72
IV.CESI.HHZ. 2020-11-23T20:34:42.06 0.1 undecidable manual P 337 25.0527 112 0.09 98
IV.T1299.HNZ. 2020-11-23T20:34:42.38 0.1 undecidable manual P 131 27.6501 50 0 99
IV.MMO1.EHZ. 2020-11-23T20:34:42.13 0.1 undecidable manual P 65 27.0507 50 -0.16 96
IV.FDMO.HHZ. 2020-11-23T20:34:42.23 0.1 undecidable manual P 11 27.0507 50 -0.06 98
IV.FEMA.HNZ. 2020-11-23T20:34:41.00 0.3 undecidable manual P 6 18.3705 119 0.23 72
IV.MC2.EHZ. 2020-11-23T20:34:41.01 0.1 undecidable manual P 46 18.3705 119 0.24 96
IT.MTCL.HGZ. 2020-11-23T20:34:41.48 0.3 undecidable manual P 355 21.9669 115 0.07 74
IV.LNSS.HHZ. 2020-11-23T20:34:41.31 0.1 undecidable manual P 177 21.5673 115 -0.03 99
IV.NRCA.HHZ. 2020-11-23T20:34:40.81 0.1 undecidable manual S 61 8.2806 140 -0.28 97
IV.NRCA.HHZ. 2020-11-23T20:34:39.29 0.1 positive manual P 61 8.2806 140 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.2 0.0002253511 0.2176 AML other m 2020-11-23T20:34:40.98
IV.NRCA.HHN. ML:1.7 0.0007859694500000001 0.128 AML other m 2020-11-23T20:34:40.97
IV.NRCA.HNE. ML:1.3 0.00025260790500000003 0.1536 AML other m 2020-11-23T20:34:41.06
IV.NRCA.HNN. ML:1.7 0.0006997991 0.1152 AML other m 2020-11-23T20:34:40.97
IV.LNSS.HHE. ML:1.0 0.000076067015 0.1152 AML other m 2020-11-23T20:34:45.09
IV.LNSS.HHN. ML:1.3 0.00013272609999999998 0.1536 AML other m 2020-11-23T20:34:44.98
IV.CESI.HHE. ML:0.8 0.000034547105 0.1152 AML other m 2020-11-23T20:34:46.14
IV.CESI.HHN. ML:1.2 0.000089129655 0.256 AML other m 2020-11-23T20:34:46.16
IV.FDMO.HHE. ML:1.1 0.00006777242999999999 0.2176 AML other m 2020-11-23T20:34:46.56
IV.FDMO.HHN. ML:0.9 0.00004035466 0.2688 AML other m 2020-11-23T20:34:46.40
IV.SMA1.EHE. ML:0.3 0.0000117127205 0.384 AML other m 2020-11-23T20:34:48.79
IV.SMA1.EHN. ML:0.5 0.000016749265 0.9088 AML other m 2020-11-23T20:34:48.31
IV.ASSB.HHE. ML:0.6 0.000012855143 0.1024 AML other m 2020-11-23T20:34:50.60
IV.ASSB.HHN. ML:0.6 0.000014640340000000002 0.1792 AML other m 2020-11-23T20:34:50.68
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