Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 23-09-2020 and time 11:18:54 (UTC) in region 2 km NE Norcia (PG)

A magnitude ML 1.9 earthquake occured in region: 2 km NE Norcia (PG), on

  • 23-09-2020 11:18:54 (UTC)
  • 23-09-2020 13:18:54 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8090, 13.1160 at 10 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 3 4957 4957
Preci PG 10 724 5681
Castelsantangelo sul Nera MC 10 281 5962
Cascia PG 13 3217 9179
Visso MC 14 1107 10286
Ussita MC 15 444 10730
Arquata del Tronto AP 15 1178 11908
Cerreto di Spoleto PG 16 1075 12983
Accumoli RI 17 667 13650
Sellano PG 18 1079 14729
Poggiodomo PG 18 117 14846
Montegallo AP 18 523 15369

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
51 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
68 Km E of Perugia (166134 inhabitants)
91 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)
98 Km W of Pescara (121014 inhabitants)
100 Km NW of Chieti (51815 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 1.9 2020-09-23
11:18:54		 42.8087 13.1157 10 2021-02-26
14:56:12		 Bollettino Sismico Italiano INGV 85846111
Reviewed
Rev100 		ML 1.9 2020-09-23
11:18:54		 42.8077 13.1082 10 2020-09-23
11:34:00		 Sala Sismica INGV-Roma 83156561
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-23 11:18:54 ± 0.04
Latitude 42.8087 ± 0.0018
Longitude 13.1157 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 85846111

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 280
Semi-minor axis of confidence ellipse (meter) 44
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 269
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 44
Number of associated phases, regardless of their use for origin computation 47
Number of defining phases 42
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.52165
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 28
Type of magnitude ML
Reference to an origin 85846111
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-12-29 17:29:08

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 28
Type of magnitude ML
Reference to an origin 83156561
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-23 11:34:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CPGN.EHZ. 2020-09-23T11:19:30.07 3.0 undecidable manual S -2.75 0
IV.RIBO.EHZ.01 2020-09-23T11:19:23.39 3.0 positive manual P 168.9087 1.71 0
IV.FIAM.HHZ. 2020-09-23T11:19:12.98 0.6 undecidable manual S 180 59.9955 50 0.18 45
IV.EL6.EHZ. 2020-09-23T11:19:12.79 0.3 undecidable manual S 359 57.7977 50 0.57 62
IV.FRON.EHZ. 2020-09-23T11:19:09.54 3.0 undecidable manual P 84.7485 0.83 0
IV.GUMA.HHZ. 2020-09-23T11:19:06.09 0.3 undecidable manual S 32 33.3444 50 0.39 68
IV.CAMP.HHZ. 2020-09-23T11:19:06.85 0.3 undecidable manual S 142 38.5281 50 -0.24 69
IV.CSP1.EHZ. 2020-09-23T11:19:05.22 0.3 undecidable manual S 13 32.2455 50 -0.18 71
IV.RM33.EHZ. 2020-09-23T11:19:05.86 0.3 undecidable manual S 166 34.2435 50 -0.06 73
IV.FIAM.HHZ. 2020-09-23T11:19:04.64 0.6 undecidable manual P 180 59.9955 50 -0.25 44
IV.CESI.HHZ. 2020-09-23T11:19:04.03 0.3 undecidable manual S 322 27.75 50 -0.16 72
IV.EL6.EHZ. 2020-09-23T11:19:04.48 0.1 positive manual P 359 57.7977 50 -0.07 93
IV.ATCC.EHZ. 2020-09-23T11:19:04.51 1.0 undecidable manual P 317 56.8986 50 0.1 23
IV.CESX.HHZ. 2020-09-23T11:19:03.44 1.0 undecidable manual P 243 48.5181 50 0.32 22
IV.FDMO.HHZ. 2020-09-23T11:19:03.25 0.1 undecidable manual S 355 25.3524 111 -0.28 94
IV.T1299.HNZ. 2020-09-23T11:19:03.26 0.3 undecidable manual S 145 23.6541 113 0.29 71
IV.MNTT.EHZ. 2020-09-23T11:19:03.41 1.0 undecidable manual P 54 48.1185 50 0.35 22
IV.ASSB.HHZ. 2020-09-23T11:19:02.47 0.3 undecidable manual P 305 45.3213 50 -0.16 70
IT.MTCL.HGZ. 2020-09-23T11:19:02.34 0.3 undecidable manual S 335 22.6551 114 -0.31 70
IV.GNU.HGZ. 2020-09-23T11:19:02.52 3.0 undecidable manual P 0
IV.GAVE.HNZ. 2020-09-23T11:19:02.71 0.1 undecidable manual S 234 22.1556 114 0.2 96
IV.MOMA.HHZ. 2020-09-23T11:19:02.77 1.0 undecidable manual P 270 44.4222 50 0.28 23
IV.MTRA.EHZ. 2020-09-23T11:19:02.52 0.6 undecidable manual S 104 23.5542 113 -0.44 46
IV.TERO.HHZ. 2020-09-23T11:19:02.61 3.0 undecidable manual P 44.8218 0.05 0
IV.LNSS.HHZ. 2020-09-23T11:19:02.97 0.3 undecidable manual S 195 23.6541 113 0 75
IV.CAMP.HHZ. 2020-09-23T11:19:01.38 0.1 undecidable manual P 142 38.5281 50 -0.21 93
IV.ARRO.EHZ. 2020-09-23T11:19:01.50 0.1 undecidable manual P 228 38.2284 50 -0.04 97
IV.MF5.EHZ. 2020-09-23T11:19:01.18 0.1 positive manual P 54 34.3434 50 0.25 93
IV.MMO1.EHZ. 2020-09-23T11:19:01.78 0.3 undecidable manual S 60 19.869 116 -0.01 75
IV.FEMA.HNZ. 2020-09-23T11:19:01.16 0.6 undecidable manual S 343 17.871 119 0 50
IV.RM33.EHZ. 2020-09-23T11:19:00.72 0.3 undecidable manual P 166 34.2435 50 -0.2 71
IV.GUMA.HHZ. 2020-09-23T11:19:00.91 0.1 undecidable manual P 32 33.3444 50 0.12 96
IV.MC2.EHZ. 2020-09-23T11:19:00.00 0.3 undecidable manual S 28 12.876 128 0.28 72
IV.CSP1.EHZ. 2020-09-23T11:19:00.44 0.3 undecidable manual P 13 32.2455 50 -0.17 71
IV.MTRA.EHZ. 2020-09-23T11:18:59.07 0.1 undecidable manual P 104 23.5542 113 -0.13 97
IV.SMA1.EHZ. 2020-09-23T11:18:59.64 0.3 undecidable manual P 138 26.6511 50 -0.12 73
IV.LNSS.HHZ. 2020-09-23T11:18:59.20 0.1 undecidable manual P 195 23.6541 113 -0.01 100
IV.FDMO.HHZ. 2020-09-23T11:18:59.36 0.1 positive manual P 355 25.3524 111 -0.18 96
IV.CESI.HHZ. 2020-09-23T11:18:59.90 0.3 undecidable manual P 322 27.75 50 -0.02 74
IV.T1299.HNZ. 2020-09-23T11:18:59.38 0.3 undecidable manual P 145 23.6541 113 0.17 72
IV.GAVE.HNZ. 2020-09-23T11:18:59.03 0.1 undecidable manual P 234 22.1556 114 0.09 98
IV.MMO1.EHZ. 2020-09-23T11:18:58.46 0.1 positive manual P 60 19.869 116 -0.07 99
IV.FEMA.HNZ. 2020-09-23T11:18:58.60 1.0 undecidable manual P 343 17.871 119 0.43 23
IT.MTCL.HGZ. 2020-09-23T11:18:58.93 0.3 undecidable manual P 335 22.6551 114 -0.1 74
IV.NRCA.HNZ. 2020-09-23T11:18:57.46 0.3 undecidable manual S 358 2.7972 164 -0.19 75
IV.MC2.EHZ. 2020-09-23T11:18:57.60 0.1 positive manual P 28 12.876 128 0.27 96
IV.NRCA.HNZ. 2020-09-23T11:18:56.31 0.1 negative manual P 358 2.7972 164 0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:2.3 0.004022405 0.0768 AML other m 2020-09-23T11:18:57.50
IV.NRCA.HNN. ML:2.3 0.003997383 0.128 AML other m 2020-09-23T11:18:57.50
IV.NRCA.HNE. ML:2.4 0.0045553220000000005 0.096 AML other m 2020-09-23T11:18:57.89
IV.NRCA.HHE. ML:2.4 0.004860312 0.1408 AML other m 2020-09-23T11:18:57.89
IV.MTRA.HNN. ML:1.9 0.00057205845 0.3008 AML other m 2020-09-23T11:19:03.62
IV.MTRA.EHN. ML:1.9 0.00054379025 0.3008 AML other m 2020-09-23T11:19:03.62
IV.LNSS.HHE. ML:2.0 0.00063235975 0.1408 AML other m 2020-09-23T11:19:03.79
IV.LNSS.HNE. ML:1.9 0.0005728678000000001 0.1408 AML other m 2020-09-23T11:19:03.80
IV.LNSS.HHN. ML:2.1 0.00084758825 0.224 AML other m 2020-09-23T11:19:03.76
IV.LNSS.HNN. ML:2.0 0.0007365236500000001 0.224 AML other m 2020-09-23T11:19:03.76
IV.CESI.HHE. ML:1.6 0.0002356409 0.1408 AML other m 2020-09-23T11:19:04.14
IV.CESI.HNE. ML:1.7 0.0002402063 0.128 AML other m 2020-09-23T11:19:04.14
IV.MTRA.HNE. ML:1.9 0.0005051107500000001 0.2176 AML other m 2020-09-23T11:19:04.28
IV.MTRA.EHE. ML:1.9 0.00049366695 0.2176 AML other m 2020-09-23T11:19:04.28
IV.FDMO.HHN. ML:1.6 0.00022194360000000001 0.1344 AML other m 2020-09-23T11:19:04.15
IV.CESI.HNN. ML:1.7 0.00026583045 0.3264 AML other m 2020-09-23T11:19:04.24
IV.FDMO.HHE. ML:1.6 0.00024608075 0.1792 AML other m 2020-09-23T11:19:04.33
IV.CESI.HHN. ML:1.8 0.00029692225 0.1216 AML other m 2020-09-23T11:19:04.47
IV.CSP1.EHN. ML:2.0 0.0004901742999999999 0.2048 AML other m 2020-09-23T11:19:05.87
IV.CSP1.EHE. ML:1.9 0.00038506365 0.1792 AML other m 2020-09-23T11:19:05.90
IV.RM33.HNE. ML:1.6 0.00015358574999999999 0.1792 AML other m 2020-09-23T11:19:06.75
IV.GUMA.HHE. ML:2.0 0.00041390835000000006 1.8016 AML other m 2020-09-23T11:19:07.05
IV.CAMP.HHN. ML:1.2 0.000062258855 1.7184 AML other m 2020-09-23T11:19:07.11
IV.MF5.EHE. ML:1.6 0.00015106685 0.2432 AML other m 2020-09-23T11:19:07.12
IV.RM33.HNN. ML:1.6 0.00014907155999999998 0.2816 AML other m 2020-09-23T11:19:07.19
IV.CAMP.HHE. ML:1.2 0.00006051271 0.3776 AML other m 2020-09-23T11:19:07.09
IV.GUMA.HHN. ML:2.0 0.00039212040000000006 0.2816 AML other m 2020-09-23T11:19:07.35
IV.EL6.EHN. ML:1.7 0.000121751415 0.224 AML other m 2020-09-23T11:19:13.70
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