Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 04-11-2021 and time 03:24:13 (Italy) in region 2 km E Norcia (PG)

A magnitude ML 1.6 earthquake occured in region: 2 km E Norcia (PG), on

  • 04-11-2021 02:24:13 (UTC)
  • 04-11-2021 03:24:13 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7940, 13.1130 at 11 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 2 4957 4957
Preci PG 11 724 5681
Cascia PG 12 3217 8898
Castelsantangelo sul Nera MC 12 281 9179
Arquata del Tronto AP 15 1178 10357
Visso MC 15 1107 11464
Accumoli RI 16 667 12131
Cerreto di Spoleto PG 16 1075 13206
Ussita MC 17 444 13650
Poggiodomo PG 17 117 13767
Sellano PG 18 1079 14846
Montegallo AP 19 523 15369
Cittareale RI 20 482 15851

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
51 Km W of Teramo (54892 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
92 Km E of Viterbo (67173 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
97 Km W of Pescara (121014 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
99 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 1.6 2021-11-04
02:24:13		 42.7942 13.1128 11 2022-03-30
13:04:17		 Bollettino Sismico Italiano INGV 97742361
Reviewed
Rev100 		ML 1.6 2021-11-04
02:24:13		 42.7932 13.1082 11 2021-11-04
02:30:24		 Sala Sismica INGV-Roma 97238151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-04 02:24:13 ± 0.04
Latitude 42.7942 ± 0.0018
Longitude 13.1128 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97742361

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 300
Semi-minor axis of confidence ellipse (meter) 141
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 85
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) 86
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.30487
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 9
Type of magnitude ML
Reference to an origin 97742361
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-12 16:15:11

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 9
Type of magnitude ML
Reference to an origin 97238151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-04 02:30:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RM33.EHZ. 2021-11-04T02:24:24.50 0.6 undecidable manual S 165 32.745 50 0.05 48
IV.CSP1.EHZ. 2021-11-04T02:24:24.90 0.1 undecidable manual S 13 33.8439 50 0.14 94
IV.CESI.HHZ. 2021-11-04T02:24:23.50 0.6 undecidable manual S 324 28.8489 50 0.07 48
IV.FDMO.HHZ. 2021-11-04T02:24:22.80 0.1 undecidable manual S 356 26.9508 50 -0.12 95
IV.SMA1.EHE. 2021-11-04T02:24:22.50 0.6 undecidable manual S 135 25.6521 50 -0.07 48
IT.MTCL.HGZ. 2021-11-04T02:24:22.06 0.6 undecidable manual S 337 24.0537 50 -0.07 48
IV.T1299.EHE. 2021-11-04T02:24:22.00 0.3 undecidable manual S 142 22.4553 50 0.28 70
IV.MTRA.HNZ. 2021-11-04T02:24:21.93 0.6 undecidable manual S 100 23.4543 50 -0.05 49
IV.LNSS.HHZ. 2021-11-04T02:24:21.30 0.3 undecidable manual S 196 22.0668 50 -0.3 70
IV.GAVE.HNZ. 2021-11-04T02:24:21.40 0.6 undecidable manual S 238 21.0678 50 0.05 49
IV.MMO1.EHZ. 2021-11-04T02:24:21.10 0.1 undecidable manual S 56 20.9679 50 -0.22 95
IV.RM33.EHZ. 2021-11-04T02:24:19.74 0.1 undecidable manual P 165 32.745 50 0.04 96
IV.MMUR.HNZ. 2021-11-04T02:24:19.65 3.0 undecidable manual Pg 0.22 0
IV.CSP1.EHZ. 2021-11-04T02:24:19.94 0.1 undecidable manual P 13 33.8439 50 0.06 95
IV.CESI.HHZ. 2021-11-04T02:24:19.14 0.3 undecidable manual P 324 28.8489 50 0.03 73
IV.MC2.EHZ. 2021-11-04T02:24:19.80 0.6 undecidable manual S 25 14.3745 127 0.31 47
IT.MTCL.HGZ. 2021-11-04T02:24:18.37 0.1 undecidable manual P 337 24.0537 50 0.01 98
IV.FDMO.HHZ. 2021-11-04T02:24:18.80 0.1 undecidable manual P 356 26.9508 50 -0.02 97
IV.LNSS.HHZ. 2021-11-04T02:24:18.05 0.1 undecidable manual P 196 22.0668 50 -0.01 98
IV.SMA1.EHE. 2021-11-04T02:24:18.64 1.0 undecidable manual P 135 25.6521 50 0.02 24
IV.GAVE.HNZ. 2021-11-04T02:24:18.00 0.3 undecidable manual P 238 21.0678 50 0.09 73
IV.T1299.EHE. 2021-11-04T02:24:18.27 0.1 undecidable manual P 142 22.4553 50 0.14 96
IV.NRCA.HNZ. 2021-11-04T02:24:17.00 0.1 undecidable manual S 2 4.3956 158 -0.29 96
IV.MTRA.HNZ. 2021-11-04T02:24:17.97 0.3 undecidable manual P 100 23.4543 50 -0.31 69
IV.MMO1.EHZ. 2021-11-04T02:24:17.95 0.1 undecidable manual P 56 20.9679 50 0.06 98
IV.MC2.EHZ. 2021-11-04T02:24:16.98 0.1 undecidable manual P 25 14.3745 127 0.14 97
IV.NRCA.HNZ. 2021-11-04T02:24:15.65 0.1 undecidable manual P 2 4.3956 158 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:2.2 0.0022949999999999997 0.08 AML other m 2021-11-04T02:24:17.09
IV.NRCA.HHN. ML:2.2 0.002665 0.08 AML other m 2021-11-04T02:24:17.09
IV.NRCA.HHE. ML:1.9 0.001245 0.18 AML other m 2021-11-04T02:24:17.13
IV.NRCA.HNE. ML:1.9 0.00133 0.18 AML other m 2021-11-04T02:24:17.13
IV.LNSS.HHN. ML:1.4 0.000154 0.94 AML other m 2021-11-04T02:24:22.81
IV.LNSS.HHE. ML:1.4 0.00016849999999999998 0.12 AML other m 2021-11-04T02:24:22.49
IV.LNSS.HNE. ML:1.5 0.00021875145 0.72 AML other m 2021-11-04T02:24:22.56
IV.CESI.HHN. ML:1.0 0.0000453486 0.2416 AML other m 2021-11-04T02:24:23.75
IV.RM33.EHE. ML:1.1 0.00005028725 1 AML other m 2021-11-04T02:24:25.17
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