Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.3 on date 28-04-2021 and time 11:19:06 (UTC) in region 5 km N Norcia (PG)

A magnitude ML 0.3 earthquake occured in region: 5 km N Norcia (PG), on

  • 28-04-2021 11:19:06 (UTC)
  • 28-04-2021 13:19:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8420, 13.0900 at 11 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 5 4957 4957
Preci PG 6 724 5681
Castelsantangelo sul Nera MC 8 281 5962
Visso MC 10 1107 7069
Ussita MC 12 444 7513
Sellano PG 14 1079 8592
Cerreto di Spoleto PG 14 1075 9667
Cascia PG 15 3217 12884
Monte Cavallo MC 18 145 13029
Arquata del Tronto AP 19 1178 14207
Poggiodomo PG 19 117 14324
Montegallo AP 20 523 14847

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
54 Km W of Teramo (54892 inhabitants)
60 Km NW of L'Aquila (69753 inhabitants)
64 Km E of Perugia (166134 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
93 Km NE of Viterbo (67173 inhabitants)
94 Km W of Montesilvano (53738 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
101 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
Bulletin
Rev1000 		ML 0.3 2021-04-28
11:19:06		 42.8422 13.0897 11 2021-05-20
09:54:11		 Bollettino Sismico Italiano INGV 90289731
Reviewed
Rev100 		ML 2.2 2021-04-28
11:19:06		 42.8442 13.0828 10 2021-04-28
11:27:30		 Sala Sismica INGV-Roma 89552991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-28 11:19:06 ± 0.06
Latitude 42.8422 ± 0.0036
Longitude 13.0897 ± 0.0061
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90289731

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 519
Semi-minor axis of confidence ellipse (meter) 341
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 117
Circular confidence region, given by single value of horizontal uncertainty (meter) 520.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.01979
Epicentral distance of station farthest from the epicenter (degree) 0.26350
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:0.3

Field Value
Value 0.3
Uncertainty 0.0
Num. used stations 1
Type of magnitude ML
Reference to an origin 90289731
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-20 09:50:13

ML:2.2

Field Value
Value 2.2
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 89552991
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-28 11:27:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-04-28T11:19:17.11 0.6 undecidable manual S 19 29.2485 91 0.1 47
IV.LNSS.HNZ. 2021-04-28T11:19:16.32 0.6 undecidable manual S 189 26.8509 91 -0.04 48
IV.GAVE.HNE. 2021-04-28T11:19:15.14 0.3 undecidable manual S 224 23.0547 91 -0.2 70
IV.CESI.HNE. 2021-04-28T11:19:15.35 0.3 undecidable manual S 320 23.4543 91 -0.12 71
IV.FDMO.HHZ. 2021-04-28T11:19:14.89 0.6 undecidable manual S 359 21.5673 91 -0.07 48
IV.MMO1.EHZ. 2021-04-28T11:19:14.40 0.3 undecidable manual S 72 20.2686 91 -0.22 71
IV.LNSS.HNZ. 2021-04-28T11:19:12.86 0.6 undecidable manual P 189 26.8509 91 0.56 42
IV.MC2.EHZ. 2021-04-28T11:19:12.46 0.3 undecidable manual S 46 11.1777 115 0.24 70
IV.CSP1.EHZ. 2021-04-28T11:19:12.61 0.3 undecidable manual P 19 29.2485 91 -0.06 72
IV.CESI.HNE. 2021-04-28T11:19:11.76 0.3 undecidable manual P 320 23.4543 91 -0.02 73
IV.GAVE.HNE. 2021-04-28T11:19:11.79 0.3 undecidable manual P 224 23.0547 91 0.08 96
IV.FDMO.HHZ. 2021-04-28T11:19:11.44 0.3 undecidable manual P 359 21.5673 91 -0.04 73
IV.MMO1.EHZ. 2021-04-28T11:19:11.18 0.1 undecidable manual P 72 20.2686 91 -0.11 97
IV.NRCA.HHN. 2021-04-28T11:19:10.40 0.1 undecidable manual S 115 2.1978 166 -0.31 72
IV.MC2.EHZ. 2021-04-28T11:19:10.05 0.1 undecidable manual P 46 11.1777 115 0.15 96
IV.NRCA.HHN. 2021-04-28T11:19:09.03 0.1 undecidable manual P 115 2.1978 166 0 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSP1.EHN. ML:0.3 0.000011263549999999997 0.32 AML other m 2021-04-28T11:19:17.25
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
Waveforms Seismic signals in miniseed + resp format Download