Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 18-11-2020 and time 12:31:52 (Italy) in region 8 km E Norcia (PG)

A magnitude ML 1.0 earthquake occured in region: 8 km E Norcia (PG), on

  • 18-11-2020 11:31:52 (UTC)
  • 18-11-2020 12:31:52 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7770, 13.1880 at 9 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 8 4957 4957
Arquata del Tronto AP 9 1178 6135
Accumoli RI 10 667 6802
Castelsantangelo sul Nera MC 14 281 7083
Montegallo AP 14 523 7606
Cascia PG 16 3217 10823
Preci PG 17 724 11547
Cittareale RI 18 482 12029
Montemonaco AP 18 604 12633
Acquasanta Terme AP 18 2916 15549
Amatrice RI 18 2657 18206
Visso MC 19 1107 19313
Ussita MC 19 444 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Foligno (57155 inhabitants)
44 Km W of Teramo (54892 inhabitants)
50 Km E of Terni (111501 inhabitants)
50 Km NW of L'Aquila (69753 inhabitants)
75 Km SE of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
93 Km NW of Chieti (51815 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km NE of Tivoli (56533 inhabitants)
97 Km E of Viterbo (67173 inhabitants)
97 Km S 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 2020-11-18
11:31:52		 42.7767 13.1878 9 2020-11-18
11:42:07		 Sala Sismica INGV-Roma 84824491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-11-18 11:31:52 ± 0.09
Latitude 42.7767 ± 0.0045
Longitude 13.1878 ± 0.0074
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84824491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 567
Semi-minor axis of confidence ellipse (meter) 244
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 250
Circular confidence region, given by single value of horizontal uncertainty (meter) 570.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 69
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.37232
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 12
Type of magnitude ML
Reference to an origin 84824491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-11-18 11:42:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RIBO.EHZ.01 2020-11-18T11:32:42.85 3.0 undecidable manual S 2.17 0
IV.CESI.HNZ. 2020-11-18T11:32:05.25 0.3 undecidable manual S 318 34.2435 50 0.23 71
IV.FDMO.HHZ. 2020-11-18T11:32:03.78 0.3 undecidable manual S 344 29.9478 106 0.01 75
IV.GAVE.EHZ. 2020-11-18T11:32:02.33 0.3 undecidable manual S 249 25.6521 109 -0.03 75
IV.LNSS.HHZ. 2020-11-18T11:32:01.21 0.6 undecidable manual S 212 22.755 111 -0.18 49
IV.SMA1.EHZ. 2020-11-18T11:32:00.77 0.3 undecidable manual S 143 20.1687 114 0.19 74
IV.MML1.HNZ. 2020-11-18T11:32:00.80 0.1 undecidable manual P 335 41.3253 50 -0.2 95
IV.FDMO.HHZ. 2020-11-18T11:32:00.07 0.1 undecidable manual P 344 29.9478 106 0.88 77
IV.TERO.HHZ. 2020-11-18T11:32:00.87 0.6 undecidable manual P 117 37.9287 50 0.38 46
IV.GUMA.HHZ. 2020-11-18T11:32:00.05 0.1 undecidable manual P 21 33.9438 50 0.19 96
IV.MMO1.EHZ. 2020-11-18T11:31:59.19 0.3 undecidable manual S 40 17.6712 117 -0.6 67
IV.MC2.EHZ. 2020-11-18T11:31:59.42 0.3 undecidable manual S 0 14.9739 121 0.47 70
IV.CSP1.EHZ. 2020-11-18T11:31:59.67 0.1 undecidable manual P 2 34.9428 50 -0.36 92
IV.MTRA.EHZ. 2020-11-18T11:31:59.60 0.6 undecidable manual S 97 17.1717 117 -0.02 51
IV.CESI.HNZ. 2020-11-18T11:31:59.82 0.1 undecidable manual P 318 34.2435 50 -0.09 98
IV.GAVE.EHZ. 2020-11-18T11:31:58.53 0.6 negative manual P 249 25.6521 109 0.16 49
IV.LNSS.HHZ. 2020-11-18T11:31:57.61 0.1 undecidable manual P 212 22.755 111 -0.2 98
IV.NRCA.HHZ. 2020-11-18T11:31:57.61 0.3 undecidable manual S 317 8.6802 135 0.38 72
IV.SMA1.EHZ. 2020-11-18T11:31:57.45 0.1 undecidable manual P 143 20.1687 114 0.1 100
IV.MTRA.EHZ. 2020-11-18T11:31:57.11 0.3 undecidable manual P 97 17.1717 117 0.32 72
IV.MMO1.EHZ. 2020-11-18T11:31:56.70 0.3 undecidable manual P 40 17.6712 117 -0.19 74
IV.MC2.EHZ. 2020-11-18T11:31:56.02 0.1 undecidable manual P 0 14.9739 121 -0.39 95
IV.NRCA.HHZ. 2020-11-18T11:31:54.85 0.1 undecidable manual P 317 8.6802 135 -0.56 92
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.0 0.00013333187 0.0576 AML other m 2020-11-18T11:31:58.25
IV.NRCA.HHN. ML:0.8 0.00009178044 0.064 AML other m 2020-11-18T11:31:58.15
IV.NRCA.HNE. ML:0.9 0.00011676825000000001 0.0768 AML other m 2020-11-18T11:31:58.25
IV.NRCA.HNN. ML:1.1 0.00017450504349999997 0.8896 AML other m 2020-11-18T11:31:57.59
IV.MTRA.EHE. ML:1.1 0.00010404273999999999 0.16 AML other m 2020-11-18T11:32:00.23
IV.MTRA.EHN. ML:0.9 0.00007578871000000001 0.1792 AML other m 2020-11-18T11:31:59.73
IV.MTRA.HNE. ML:1.2 0.000137980945 0.2816 AML other m 2020-11-18T11:32:00.64
IV.MTRA.HNN. ML:1.0 0.000098984305 0.2944 AML other m 2020-11-18T11:32:00.65
IV.LNSS.HHE. ML:1.0 0.000065674285 0.2432 AML other m 2020-11-18T11:32:01.17
IV.LNSS.HHN. ML:1.0 0.0000630392 0.1984 AML other m 2020-11-18T11:32:01.88
IV.GAVE.EHE. ML:0.8 0.000033131645 0.1792 AML other m 2020-11-18T11:32:03.18
IV.GAVE.EHN. ML:0.8 0.000034122730000000007 0.2432 AML other m 2020-11-18T11:32:04.00
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