Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 01-11-2021 and time 09:35:31 (Italy) in region 4 km NE Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 4 km NE Norcia (PG), on

  • 01-11-2021 08:35:31 (UTC)
  • 01-11-2021 09:35:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8300, 13.1140 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 4 4957 4957
Castelsantangelo sul Nera MC 8 281 5238
Preci PG 8 724 5962
Visso MC 12 1107 7069
Ussita MC 13 444 7513
Cascia PG 15 3217 10730
Cerreto di Spoleto PG 16 1075 11805
Arquata del Tronto AP 16 1178 12983
Sellano PG 17 1079 14062
Montegallo AP 18 523 14585
Accumoli RI 19 667 15252
Montemonaco AP 19 604 15856
Poggiodomo PG 20 117 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
52 Km W of Teramo (54892 inhabitants)
58 Km NW of L'Aquila (69753 inhabitants)
67 Km E of Perugia (166134 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
94 Km SW of Ancona (100861 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
99 Km W of Pescara (121014 inhabitants)
100 Km N of Tivoli (56533 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 0.9 2021-11-01
08:35:31		 42.83 13.1142 11 2021-11-01
08:49:31		 Sala Sismica INGV-Roma 97137291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-01 08:35:31 ± 0.08
Latitude 42.8300 ± 0.0054
Longitude 13.1142 ± 0.0098
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97137291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 856
Semi-minor axis of confidence ellipse (meter) 485
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 112
Circular confidence region, given by single value of horizontal uncertainty (meter) 860.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 127
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.23382
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 97137291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-01 08:49:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VULT.HHZ. 2021-11-01T08:37:00.12 3.0 undecidable manual Sg 5.38 0
AC.VLO.HHZ. 2021-11-01T08:36:53.36 3.0 undecidable manual Pn 1.67 0
IV.CADC.EHZ. 2021-11-01T08:36:52.23 3.0 undecidable manual Sg 4.54 0
IV.EUCT.HNZ. 2021-11-01T08:36:51.47 3.0 undecidable manual Sn -3.84 0
IV.CMIS.HHZ. 2021-11-01T08:36:31.30 3.0 undecidable manual Sn -9.99 0
IV.RAVA.EHZ. 2021-11-01T08:36:26.61 3.0 undecidable manual Sg 2.77 0
IX.MNT3.EHZ.02 2021-11-01T08:36:17.15 3.0 negative manual Pg 5.32 0
IV.SENI.HNZ. 2021-11-01T08:35:50.31 3.0 undecidable manual S -2.27 0
IV.CESI.HHZ. 2021-11-01T08:35:40.33 0.3 undecidable manual S 319 25.8519 50 -0.25 70
IV.FRON.EHZ. 2021-11-01T08:35:40.37 3.0 undecidable manual S 0.93 0
IV.FDMO.HHZ. 2021-11-01T08:35:39.76 0.1 undecidable manual S 355 22.9548 50 -0.07 97
IV.MCIV.CHZ. 2021-11-01T08:35:39.92 3.0 undecidable manual Pg 0.54 0
IV.GAVE.EHZ. 2021-11-01T08:35:39.85 0.3 undecidable manual S 230 23.5542 50 -0.13 72
IV.MF5.EHZ. 2021-11-01T08:35:38.30 3.0 undecidable manual P -0.5 0
IV.MMO1.EHZ. 2021-11-01T08:35:38.36 0.3 undecidable manual S 66 18.9699 120 -0.37 69
IV.LNSS.HHZ. 2021-11-01T08:35:36.74 0.1 undecidable manual P 193 25.9518 50 0.12 96
IV.FDMO.HHZ. 2021-11-01T08:35:36.26 1.0 positive manual P 355 22.9548 50 0.09 24
IV.MC2.EHZ. 2021-11-01T08:35:36.79 0.3 undecidable manual S 34 10.878 135 0.3 71
IV.GAVE.EHZ. 2021-11-01T08:35:36.29 0.1 undecidable manual P 230 23.5542 50 0.04 98
IV.SACS.HHZ. 2021-11-01T08:35:36.96 3.0 undecidable manual Pg 1.16 0
IV.CESI.HHZ. 2021-11-01T08:35:36.93 0.6 undecidable manual P 319 25.8519 50 0.33 46
IV.MMO1.EHZ. 2021-11-01T08:35:35.49 0.1 undecidable manual P 66 18.9699 120 -0.05 98
IV.NRCA.HHZ. 2021-11-01T08:35:34.63 0.1 undecidable manual S 1 0.3996 178 -0.29 96
IV.MC2.EHZ. 2021-11-01T08:35:34.53 0.1 undecidable manual P 34 10.878 135 0.29 95
IV.NRCA.HHZ. 2021-11-01T08:35:33.45 0.1 undecidable manual P 1 0.3996 178 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:0.8 0.00003345 0.2 AML other m 2021-11-01T08:35:40.56
IV.GAVE.EHE. ML:0.8 0.0000345657615 0.1152 AML other m 2021-11-01T08:35:40.09
IV.FDMO.HHE. ML:0.6 0.00002297365 0.1216 AML other m 2021-11-01T08:35:40.36
IV.FDMO.HHN. ML:0.4 0.000013611845 0.16 AML other m 2021-11-01T08:35:41.73
IV.GAVE.HNE. ML:1.4 0.0001519731 0.5248 AML other m 2021-11-01T08:35:53.48
IV.GAVE.HNN. ML:1.5 0.0002004718 0.9536 AML other m 2021-11-01T08:35:39.51
IV.LNSS.HHE. ML:0.8 0.000032968935 0.0576 AML other m 2021-11-01T08:35:42.19
IV.LNSS.HHN. ML:0.6 0.000024437374999999996 0.0576 AML other m 2021-11-01T08:35:41.96
IV.LNSS.HNE. ML:1.4 0.00014510810499999998 1.344 AML other m 2021-11-01T08:35:55.72
IV.LNSS.HNN. ML:1.5 0.0001745278 0.6208 AML other m 2021-11-01T08:35:51.36
IV.MF5.EHE. ML:0.8 0.000030864325000000004 1.2992 AML other m 2021-11-01T08:36:00.57
IV.MF5.EHN. ML:0.9 0.0000369129255 1.3952 AML other m 2021-11-01T08:35:49.04
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