Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 17-03-2021 and time 00:11:50 (Italy) in region 4 km SE Norcia (PG)

A magnitude ML 1.4 earthquake occured in region: 4 km SE Norcia (PG), on

  • 16-03-2021 23:11:50 (UTC)
  • 17-03-2021 00:11:50 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7660, 13.1230 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
Cascia PG 10 3217 8174
Accumoli RI 13 667 8841
Arquata del Tronto AP 14 1178 10019
Preci PG 14 724 10743
Castelsantangelo sul Nera MC 15 281 11024
Poggiodomo PG 16 117 11141
Cittareale RI 17 482 11623
Cerreto di Spoleto PG 18 1075 12698
Visso MC 19 1107 13805
Monteleone di Spoleto PG 19 599 14404
Montegallo AP 19 523 14927
Ussita MC 20 444 15371

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km SE of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
71 Km SE of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km E of Viterbo (67173 inhabitants)
93 Km N of Tivoli (56533 inhabitants)
95 Km W of Pescara (121014 inhabitants)
97 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 1.4 2021-03-16
23:11:50		 42.7655 13.1228 11 2021-03-16
23:21:36		 Sala Sismica INGV-Roma 88195141
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-16 23:11:50 ± 0.08
Latitude 42.7655 ± 0.0027
Longitude 13.1228 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88195141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 330
Semi-minor axis of confidence ellipse (meter) 78
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 91
Circular confidence region, given by single value of horizontal uncertainty (meter) 330.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 50
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 39
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.06835
Epicentral distance of station farthest from the epicenter (degree) 0.56387
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 88195141
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-16 23:21:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-03-16T23:12:10.27 0.1 undecidable manual S 358 62.5929 50 0.62 78
IV.CESX.HHZ. 2021-03-16T23:12:05.68 0.1 undecidable manual S 248 47.0196 50 0.17 91
IV.MOMA.HHZ. 2021-03-16T23:12:05.58 0.1 undecidable manual S 276 45.2214 50 0.56 82
IV.TERO.HHZ. 2021-03-16T23:12:04.07 0.1 undecidable manual S 112 42.3243 50 -0.18 92
IV.GUMA.HHZ. 2021-03-16T23:12:03.61 0.1 undecidable manual S 28 37.2294 50 0.72 78
IV.CSP1.EHZ. 2021-03-16T23:12:02.82 0.1 undecidable manual S 10 36.8298 50 0.04 94
IV.ARRO.EHZ. 2021-03-16T23:12:02.25 0.1 undecidable manual S 235 35.742 50 -0.24 92
IV.EL6.EHZ. 2021-03-16T23:12:01.35 0.1 undecidable manual P 358 62.5929 50 -0.19 88
IV.CESI.HHZ. 2021-03-16T23:12:01.06 0.1 undecidable manual S 326 31.9458 50 -0.42 89
IV.RM33.EHZ. 2021-03-16T23:12:00.81 0.1 undecidable manual S 165 29.4483 50 0 97
IV.MNTT.EHZ. 2021-03-16T23:12:00.51 0.6 negative manual P 49 50.616 50 0.82 37
IV.SMA1.EHZ. 2021-03-16T23:11:59.06 0.3 undecidable manual S 131 22.8549 50 -0.01 73
IV.CESX.HHZ. 2021-03-16T23:11:59.34 0.1 undecidable manual P 248 47.0196 50 0.2 90
IT.MTCL.HGZ. 2021-03-16T23:11:59.64 0.1 undecidable manual S 338 27.2505 50 -0.59 85
IV.TERO.HHZ. 2021-03-16T23:11:58.18 0.1 undecidable manual P 112 42.3243 50 -0.23 90
IV.LNSS.HHZ. 2021-03-16T23:11:58.09 0.3 undecidable manual S 200 19.2696 50 0 74
IV.MOMA.HHZ. 2021-03-16T23:11:58.80 0.1 undecidable manual P 276 45.2214 50 -0.06 93
IV.FEMA.HNZ. 2021-03-16T23:11:58.85 0.1 undecidable manual S 345 22.5552 50 -0.14 96
IV.GAVE.EHZ. 2021-03-16T23:11:58.56 0.1 undecidable manual S 246 20.3685 50 0.18 95
IV.MTRA.EHZ. 2021-03-16T23:11:58.84 0.1 undecidable manual S 92 22.3554 50 -0.07 97
IV.T1299.HNZ. 2021-03-16T23:11:58.47 0.1 undecidable manual S 138 19.5693 50 0.3 92
IV.MMO1.EHZ. 2021-03-16T23:11:58.59 0.1 undecidable manual S 48 22.2555 50 -0.31 93
IV.ARRO.EHZ. 2021-03-16T23:11:57.20 0.1 undecidable manual P 235 35.742 50 -0.2 92
IV.CSP1.EHZ. 2021-03-16T23:11:57.37 0.1 undecidable manual P 10 36.8298 50 -0.2 92
IV.GUMA.HHZ. 2021-03-16T23:11:57.86 0.1 undecidable manual P 28 37.2294 50 0.23 91
IV.MC2.EHZ. 2021-03-16T23:11:57.78 0.1 undecidable manual S 18 17.0718 122 0.32 93
IV.CESI.HHZ. 2021-03-16T23:11:56.55 0.1 undecidable manual P 326 31.9458 50 -0.27 91
IV.RM33.EHZ. 2021-03-16T23:11:56.30 0.1 undecidable manual P 165 29.4483 50 -0.13 94
IV.MTRA.EHZ. 2021-03-16T23:11:55.17 0.1 undecidable manual P 92 22.3554 50 -0.16 95
IV.T1299.HNZ. 2021-03-16T23:11:55.09 0.1 undecidable manual P 138 19.5693 50 0.19 95
IV.MMO1.EHZ. 2021-03-16T23:11:55.16 0.1 undecidable manual P 48 22.2555 50 -0.17 95
IV.SMA1.EHZ. 2021-03-16T23:11:55.34 0.1 undecidable manual P 131 22.8549 50 -0.08 96
IV.NRCA.HNZ. 2021-03-16T23:11:55.09 0.1 undecidable manual S 355 7.5813 145 0.06 100
IV.FEMA.HNZ. 2021-03-16T23:11:55.34 0.1 undecidable manual P 345 22.5552 50 -0.04 97
IT.MTCL.HGZ. 2021-03-16T23:11:55.94 0.1 undecidable manual P 338 27.2505 50 -0.16 94
IV.MC2.EHZ. 2021-03-16T23:11:54.50 0.1 undecidable manual P 18 17.0718 122 0 99
IV.LNSS.HHZ. 2021-03-16T23:11:54.85 0.1 positive manual P 200 19.2696 50 -0.01 98
IV.GAVE.EHZ. 2021-03-16T23:11:54.99 0.1 positive manual P 246 20.3685 50 -0.04 98
IV.NRCA.HNZ. 2021-03-16T23:11:53.23 0.1 negative manual P 355 7.5813 145 0.13 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.8 0.0009855 0.12 AML other m 2021-03-16T23:11:55.15
IV.NRCA.HHN. ML:1.6 0.000533 0.18 AML other m 2021-03-16T23:11:55.63
IV.LNSS.HHN. ML:1.4 0.000184 0.22 AML other m 2021-03-16T23:11:58.53
IV.LNSS.HHE. ML:1.4 0.000195 0.72 AML other m 2021-03-16T23:11:59.44
IV.MTRA.EHN. ML:1.2 0.00010435 0.68 AML other m 2021-03-16T23:11:59.93
IV.MTRA.EHE. ML:1.3 0.00013550000000000001 1.44 AML other m 2021-03-16T23:12:00.10
IV.SMA1.EHN. ML:1.3 0.0001185 0.4 AML other m 2021-03-16T23:12:00.24
IV.SMA1.EHE. ML:1.2 0.0001047 1.26 AML other m 2021-03-16T23:12:00.99
IV.CESI.HHN. ML:1.6 0.000168 0.32 AML other m 2021-03-16T23:12:01.57
IV.CESI.HHE. ML:1.2 0.0000726 1 AML other m 2021-03-16T23:12:01.59
IV.ARRO.EHE. ML:1.0 0.0000375 0.86 AML other m 2021-03-16T23:12:03.81
IV.GUMA.HHE. ML:1.8 0.0002275 1.04 AML other m 2021-03-16T23:12:04.06
IV.ARRO.EHN. ML:1.2 0.0000627 0.16 AML other m 2021-03-16T23:12:05.37
IV.GUMA.HHN. ML:1.6 0.000149 0.56 AML other m 2021-03-16T23:12:05.90
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