Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 19-03-2021 and time 22:22:11 (Italy) in region 8 km SE Norcia (PG)

A magnitude ML 0.4 earthquake occured in region: 8 km SE Norcia (PG), on

  • 19-03-2021 21:22:11 (UTC)
  • 19-03-2021 22:22:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7520, 13.1710 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 8 4957 4957
Accumoli RI 9 667 5624
Arquata del Tronto AP 11 1178 6802
Cascia PG 13 3217 10019
Cittareale RI 15 482 10501
Castelsantangelo sul Nera MC 16 281 10782
Amatrice RI 17 2657 13439
Montegallo AP 17 523 13962
Preci PG 18 724 14686
Acquasanta Terme AP 20 2916 17602
Poggiodomo PG 20 117 17719

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km SE of Foligno (57155 inhabitants)
45 Km W of Teramo (54892 inhabitants)
48 Km E of Terni (111501 inhabitants)
48 Km NW of L'Aquila (69753 inhabitants)
75 Km SE of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
93 Km NE of Tivoli (56533 inhabitants)
93 Km W of Chieti (51815 inhabitants)
95 Km E of Viterbo (67173 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 0.4 2021-03-19
21:22:11		 42.7517 13.1713 11 2021-03-19
21:41:32		 Sala Sismica INGV-Roma 88291711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-19 21:22:11 ± 0.1
Latitude 42.7517 ± 0.0036
Longitude 13.1713 ± 0.0049
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 88291711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 359
Semi-minor axis of confidence ellipse (meter) 254
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 72
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 120
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.09173
Epicentral distance of station farthest from the epicenter (degree) 0.34264
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:0.4

Field Value
Value 0.4
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 88291711
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-19 21:41:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-03-19T21:22:23.55 0.3 undecidable manual S 112 38.0286 50 -0.23 69
IV.MMO1.EHZ. 2021-03-19T21:22:19.39 0.1 undecidable manual S 38 20.6682 50 0.25 98
IV.MTRA.HNE. 2021-03-19T21:22:18.25 0.3 undecidable manual S 88 18.3705 50 -0.27 72
IV.SMA1.EHN. 2021-03-19T21:22:18.77 0.1 undecidable manual S 135 18.9699 50 0.09 98
IV.TERO.HHZ. 2021-03-19T21:22:18.54 0.6 undecidable manual P 112 38.0286 50 0.09 48
IV.LNSS.HHE. 2021-03-19T21:22:18.83 0.1 undecidable manual S 213 19.6692 50 -0.04 99
IV.T1299.HNE. 2021-03-19T21:22:17.92 0.3 undecidable manual S 145 15.873 50 0.07 73
IV.MMO1.EHZ. 2021-03-19T21:22:16.01 0.6 negative manual P 38 20.6682 50 0.24 49
IV.NRCA.HHZ. 2021-03-19T21:22:16.19 0.1 undecidable manual S 333 10.1787 137 -0.19 99
IV.LNSS.HHE. 2021-03-19T21:22:15.70 0.1 undecidable manual P 213 19.6692 50 0.1 100
IV.T1299.HNE. 2021-03-19T21:22:15.19 0.3 undecidable manual P 145 15.873 50 0.17 73
IV.MTRA.HNE. 2021-03-19T21:22:15.48 0.3 undecidable manual P 88 18.3705 50 0.07 75
IV.SMA1.EHN. 2021-03-19T21:22:15.90 0.3 undecidable manual P 135 18.9699 50 0.4 69
IV.NRCA.HHZ. 2021-03-19T21:22:14.30 0.1 positive manual P 333 10.1787 137 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.5 0.0000369 0.5 AML other m 2021-03-19T21:22:17.35
IV.NRCA.HHN. ML:0.4 0.0000307 0.82 AML other m 2021-03-19T21:22:17.89
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