Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 05-04-2021 and time 20:07:56 (UTC) in region 3 km NE Norcia (PG)

A magnitude ML 1.3 earthquake occured in region: 3 km NE Norcia (PG), on

  • 05-04-2021 20:07:56 (UTC)
  • 05-04-2021 22:07:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8180, 13.1170 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 3 4957 4957
Castelsantangelo sul Nera MC 9 281 5238
Preci PG 9 724 5962
Visso MC 13 1107 7069
Cascia PG 14 3217 10286
Ussita MC 14 444 10730
Arquata del Tronto AP 16 1178 11908
Cerreto di Spoleto PG 16 1075 12983
Sellano PG 17 1079 14062
Accumoli RI 17 667 14729
Montegallo AP 18 523 15252
Poggiodomo PG 19 117 15369
Montemonaco AP 20 604 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
51 Km W of Teramo (54892 inhabitants)
57 Km NW of L'Aquila (69753 inhabitants)
67 Km E of Perugia (166134 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km W of Pescara (121014 inhabitants)
98 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
Reviewed
Rev100 		ML 1.3 2021-04-05
20:07:56		 42.8177 13.1167 11 2021-04-05
20:21:54		 Sala Sismica INGV-Roma 88800321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-05 20:07:56 ± 0.08
Latitude 42.8177 ± 0.0036
Longitude 13.1167 ± 0.0074
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 88800321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 597
Semi-minor axis of confidence ellipse (meter) 367
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 76
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 187
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40739
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 88800321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-05 20:21:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.COR1.EHZ. 2021-04-05T20:08:22.87 3.0 undecidable manual S 0 0
IV.MMUR.HNZ. 2021-04-05T20:08:16.69 3.0 undecidable manual S -0.53 0
IV.TERO.HHZ. 2021-04-05T20:08:11.16 0.6 undecidable manual S 118 45.2214 50 -0.07 92
IV.RM33.EHZ. 2021-04-05T20:08:08.61 0.6 undecidable manual S 167 35.1426 50 0.07 94
IV.TERO.HHZ. 2021-04-05T20:08:05.18 0.6 positive manual P 118 45.2214 50 0.15 91
IV.FDMO.HHZ. 2021-04-05T20:08:05.54 0.6 undecidable manual S 354 24.3534 50 -0.13 95
IV.RM33.EHZ. 2021-04-05T20:08:03.31 1.0 undecidable manual P 167 35.1426 50 -0.17 46
IV.MMO1.EHZ. 2021-04-05T20:08:03.98 0.6 undecidable manual S 62 19.3695 118 -0.22 94
IV.MC2.EHZ. 2021-04-05T20:08:02.40 0.6 undecidable manual S 29 11.9769 131 0.32 93
IV.SMA1.EHZ. 2021-04-05T20:08:02.31 1.0 undecidable manual P 139 27.3504 50 0.04 48
IV.FDMO.HHZ. 2021-04-05T20:08:01.81 0.6 positive manual P 354 24.3534 50 -0.01 97
IV.NRCA.HHZ. 2021-04-05T20:08:00.02 0.6 undecidable manual S 354 1.7982 170 -0.22 96
IV.MC2.EHZ. 2021-04-05T20:08:00.03 1.0 positive manual P 29 11.9769 131 0.28 47
IV.MMO1.EHZ. 2021-04-05T20:08:00.88 1.0 undecidable manual P 62 19.3695 118 -0.09 48
IV.NRCA.HHZ. 2021-04-05T20:07:58.74 0.6 undecidable manual P 354 1.7982 170 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.3 0.000319 0.72 AML other m 2021-04-05T20:08:00.51
IV.NRCA.HHN. ML:1.3 0.00033299999999999996 0.14 AML other m 2021-04-05T20:08:00.15
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