Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 01-11-2021 and time 00:44:25 (Italy) in region 2 km E Norcia (PG)

A magnitude ML 1.0 earthquake occured in region: 2 km E Norcia (PG), on

  • 31-10-2021 23:44:25 (UTC)
  • 01-11-2021 00:44:25 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8000, 13.1150 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 2 4957 4957
Preci PG 11 724 5681
Castelsantangelo sul Nera MC 11 281 5962
Cascia PG 12 3217 9179
Visso MC 15 1107 10286
Arquata del Tronto AP 15 1178 11464
Accumoli RI 16 667 12131
Ussita MC 16 444 12575
Cerreto di Spoleto PG 16 1075 13650
Poggiodomo PG 18 117 13767
Sellano PG 18 1079 14846
Montegallo AP 19 523 15369

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
47 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)
93 Km E of Viterbo (67173 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
97 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
Reviewed
Rev100 		ML 1.0 2021-10-31
23:44:25		 42.7997 13.1147 10 2021-10-31
23:49:56		 Sala Sismica INGV-Roma 97122881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-31 23:44:25 ± 0.12
Latitude 42.7997 ± 0.0063
Longitude 13.1147 ± 0.0098
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97122881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 926
Semi-minor axis of confidence ellipse (meter) 453
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 311
Circular confidence region, given by single value of horizontal uncertainty (meter) 930.0
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 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.03417
Epicentral distance of station farthest from the epicenter (degree) 0.40020
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.5
Num. used stations 8
Type of magnitude ML
Reference to an origin 97122881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-31 23:49:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-10-31T23:44:33.48 1.0 undecidable manual P 116 44.4222 50 0 32
IV.MMO1.EHZ. 2021-10-31T23:44:32.88 0.3 undecidable manual S 57 20.4684 116 -0.15 98
IV.MC2.EHZ. 2021-10-31T23:44:31.25 0.3 undecidable manual S 26 13.7751 126 0.21 98
IV.CSP1.EHZ. 2021-10-31T23:44:31.63 1.0 undecidable manual P 13 33.2445 50 -0.12 32
IV.LNSS.HHZ. 2021-10-31T23:44:30.19 0.6 undecidable manual P 196 22.6551 114 0.12 66
IV.CESI.HHZ. 2021-10-31T23:44:30.75 1.0 undecidable manual P 323 28.4493 50 -0.26 32
IV.MMO1.EHZ. 2021-10-31T23:44:29.60 1.0 negative manual P 57 20.4684 116 -0.08 33
IV.NRCA.HHZ. 2021-10-31T23:44:28.65 0.3 undecidable manual S 359 3.7962 160 -0.21 100
IV.MC2.EHZ. 2021-10-31T23:44:28.81 0.6 undecidable manual P 26 13.7751 126 0.29 64
IV.NRCA.HHZ. 2021-10-31T23:44:27.32 1.0 undecidable manual P 359 3.7962 160 0.06 34
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.4 0.00045291190000000005 0.0896 AML other m 2021-10-31T23:44:28.81
IV.NRCA.HHN. ML:1.3 0.00038 0.08 AML other m 2021-10-31T23:44:28.72
IV.NRCA.HNE. ML:1.4 0.00043551275 0.0768 AML other m 2021-10-31T23:44:28.81
IV.NRCA.HNN. ML:1.3 0.0003208753 0.0896 AML other m 2021-10-31T23:44:28.72
IV.LNSS.HHE. ML:0.7 0.00003716816 0.1408 AML other m 2021-10-31T23:44:34.57
IV.LNSS.HHN. ML:0.6 0.000025214945 0.1536 AML other m 2021-10-31T23:44:34.50
IV.CESI.HHE. ML:0.3 0.000011244836500000001 0.1024 AML other m 2021-10-31T23:44:34.00
IV.CESI.HHN. ML:0.3 0.000010577158 0.0768 AML other m 2021-10-31T23:44:35.33
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