Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 24-10-2021 and time 22:01:39 (Italy) in region 6 km SE Norcia (PG)

A magnitude ML 1.2 earthquake occured in region: 6 km SE Norcia (PG), on

  • 24-10-2021 20:01:39 (UTC)
  • 24-10-2021 22:01:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7610, 13.1590 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 6 4957 4957
Accumoli RI 10 667 5624
Arquata del Tronto AP 11 1178 6802
Cascia PG 13 3217 10019
Castelsantangelo sul Nera MC 15 281 10300
Cittareale RI 16 482 10782
Preci PG 16 724 11506
Montegallo AP 17 523 12029
Amatrice RI 18 2657 14686
Poggiodomo PG 19 117 14803
Visso MC 20 1107 15910

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km SE of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
47 Km E of Terni (111501 inhabitants)
50 Km NW of L'Aquila (69753 inhabitants)
74 Km SE of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km W of Pescara (121014 inhabitants)
93 Km NE of Tivoli (56533 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
94 Km W of Chieti (51815 inhabitants)
100 Km SW 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 1.2 2021-10-24
20:01:39		 42.7608 13.1587 10 2021-10-24
20:05:49		 Sala Sismica INGV-Roma 96962221
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-24 20:01:39 ± 0.05
Latitude 42.7608 ± 0.0027
Longitude 13.1587 ± 0.0049
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96962221

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 390
Semi-minor axis of confidence ellipse (meter) 150
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 101
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 23
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) 0.37772
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 96962221
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-24 20:05:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-10-24T20:02:00.92 3.0 undecidable manual S 0.32 0
IV.ASSB.HHZ. 2021-10-24T20:01:55.76 3.0 undecidable manual S -1.5 0
IV.MML1.EHZ. 2021-10-24T20:01:53.63 0.3 undecidable manual S 339 41.9247 50 0.05 71
IV.CSP1.EHZ. 2021-10-24T20:01:52.16 0.6 undecidable manual S 6 36.9297 50 -0.08 48
IV.MF5.EHZ. 2021-10-24T20:01:52.55 0.6 undecidable manual S 44 35.1426 50 0.79 39
IV.CESI.HHZ. 2021-10-24T20:01:51.18 0.3 undecidable manual S 323 34.0437 50 -0.29 69
IV.FOSV.EHZ. 2021-10-24T20:01:50.13 3.0 undecidable manual P -2.1 0
IV.RM33.EHZ. 2021-10-24T20:01:49.81 0.6 undecidable manual S 171 28.3494 50 -0.12 48
IV.GAVE.EHZ. 2021-10-24T20:01:48.44 0.3 undecidable manual S 251 22.8549 114 -0.02 74
IV.LNSS.HHZ. 2021-10-24T20:01:47.69 0.3 undecidable manual S 209 19.9689 117 0.12 73
IV.ARRO.EHZ. 2021-10-24T20:01:47.28 3.0 negative manual Pg -0.04 0
IV.MF5.EHZ. 2021-10-24T20:01:47.02 0.6 positive manual P 44 35.1426 50 0.34 45
IV.MMO1.EHZ. 2021-10-24T20:01:47.44 0.6 undecidable manual S 42 20.5683 117 -0.31 47
IV.TERO.HHZ. 2021-10-24T20:01:47.12 3.0 undecidable manual P -0.21 0
IV.SMA1.EHZ. 2021-10-24T20:01:47.39 0.6 undecidable manual S 135 20.3685 117 -0.31 47
IV.MML1.EHZ. 2021-10-24T20:01:47.84 1.0 negative manual P 339 41.9247 50 0.1 23
IV.CSP1.EHZ. 2021-10-24T20:01:46.79 0.6 positive manual P 6 36.9297 50 -0.17 47
IV.MC2.EHZ. 2021-10-24T20:01:46.62 0.1 undecidable manual S 8 16.872 121 -0.01 100
IV.CESI.HHZ. 2021-10-24T20:01:46.48 0.1 undecidable manual P 323 34.0437 50 -0.04 96
IV.FDMO.HHZ. 2021-10-24T20:01:45.83 0.6 undecidable manual P 349 31.1466 50 -0.24 47
IV.RM33.EHZ. 2021-10-24T20:01:45.57 0.6 negative manual P 171 28.3494 50 -0.06 48
IV.NRCA.HNZ. 2021-10-24T20:01:44.46 0.3 undecidable manual S 336 8.7801 139 -0.01 76
IV.SMA1.EHZ. 2021-10-24T20:01:44.31 0.6 negative manual P 135 20.3685 117 -0.03 50
IV.LNSS.HHZ. 2021-10-24T20:01:44.37 0.1 positive manual P 209 19.9689 117 0.1 98
IV.MC2.EHZ. 2021-10-24T20:01:44.05 1.0 undecidable manual P 8 16.872 121 0.32 23
IV.GAVE.EHZ. 2021-10-24T20:01:44.89 0.6 undecidable manual P 251 22.8549 114 0.11 49
IV.MMO1.EHZ. 2021-10-24T20:01:44.23 0.6 undecidable manual P 42 20.5683 117 -0.14 48
IV.NRCA.HNZ. 2021-10-24T20:01:42.71 0.3 positive manual P 336 8.7801 139 0.23 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.8 0.0008440000000000001 0.06 AML other m 2021-10-24T20:01:44.52
IV.NRCA.HHE. ML:2.0 0.001375 0.34 AML other m 2021-10-24T20:01:44.61
IV.SMA1.EHN. ML:1.0 0.00006625 0.42 AML other m 2021-10-24T20:01:47.64
IV.LNSS.HHE. ML:1.2 0.00011535000000000001 1.12 AML other m 2021-10-24T20:01:48.76
IV.LNSS.HHN. ML:1.2 0.000127 0.34 AML other m 2021-10-24T20:01:48.90
IV.RM33.EHE. ML:1.2 0.00007644999999999999 0.14 AML other m 2021-10-24T20:01:50.32
IV.SMA1.EHE. ML:1.1 0.00010125000000000001 1.56 AML other m 2021-10-24T20:01:50.85
IV.RM33.EHN. ML:1.2 0.00007805000000000001 1.28 AML other m 2021-10-24T20:01:51.91
IV.CESI.HHN. ML:1.0 0.00003905 0.8 AML other m 2021-10-24T20:01:52.56
IV.CESI.HHE. ML:1.0 0.000045350000000000005 0.74 AML other m 2021-10-24T20:01:52.37
IV.ARRO.EHE. ML:1.1 0.000049600000000000006 0.84 AML other m 2021-10-24T20:01:54.83
IV.ARRO.EHN. ML:1.1 0.000051500000000000005 0.58 AML other m 2021-10-24T20:01:54.97
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