Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 08-04-2021 and time 23:11:52 (UTC) in region 2 km NW Norcia (PG)

A magnitude ML 0.7 earthquake occured in region: 2 km NW Norcia (PG), on

  • 08-04-2021 23:11:52 (UTC)
  • 09-04-2021 01:11:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8050, 13.0790 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 2 4957 4957
Preci PG 9 724 5681
Cascia PG 11 3217 8898
Castelsantangelo sul Nera MC 12 281 9179
Cerreto di Spoleto PG 13 1075 10254
Visso MC 14 1107 11361
Poggiodomo PG 16 117 11478
Sellano PG 16 1079 12557
Ussita MC 16 444 13001
Vallo di Nera PG 18 364 13365
Arquata del Tronto AP 18 1178 14543
Accumoli RI 18 667 15210
Monteleone di Spoleto PG 20 599 15809

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km E of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
54 Km W of Teramo (54892 inhabitants)
57 Km NW of L'Aquila (69753 inhabitants)
66 Km SE of Perugia (166134 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
93 Km W of Montesilvano (53738 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
97 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 0.7 2021-04-08
23:11:52		 42.8047 13.079 10 2021-04-08
23:18:04		 Sala Sismica INGV-Roma 88923441
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-08 23:11:52 ± 0.05
Latitude 42.8047 ± 0.0027
Longitude 13.0790 ± 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 88923441

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 390
Semi-minor axis of confidence ellipse (meter) 65
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 284
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) 98
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
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) 0.03867
Epicentral distance of station farthest from the epicenter (degree) 0.25631
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.3
Num. used stations 7
Type of magnitude ML
Reference to an origin 88923441
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-08 23:18:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SMA1.EHZ. 2021-04-08T23:12:02.54 0.3 undecidable manual S 133 28.4493 50 0.02 74
IV.T1299.EHZ. 2021-04-08T23:12:01.77 0.3 undecidable manual S 139 25.1526 50 0.14 73
IV.CESI.HNZ. 2021-04-08T23:12:01.97 0.3 undecidable manual S 328 26.3514 50 0.01 75
IV.FDMO.HHZ. 2021-04-08T23:12:01.54 0.3 undecidable manual S 1 25.752 50 -0.26 71
IV.MMO1.EHZ. 2021-04-08T23:12:00.54 0.3 undecidable manual S 62 22.755 114 -0.42 69
IV.LNSS.HHZ. 2021-04-08T23:12:00.61 0.3 undecidable manual S 188 22.5552 115 -0.31 71
IV.GAVE.EHZ. 2021-04-08T23:11:59.99 0.3 undecidable manual S 230 19.5693 118 0.03 75
IV.SMA1.EHZ. 2021-04-08T23:11:58.47 0.3 undecidable manual P 133 28.4493 50 0.27 71
IV.MC2.EHZ. 2021-04-08T23:11:58.89 0.3 undecidable manual S 37 14.874 125 0.32 71
IV.LNSS.HHZ. 2021-04-08T23:11:57.18 0.3 undecidable manual P 188 22.5552 115 -0.09 74
IV.CESI.HNZ. 2021-04-08T23:11:57.85 0.3 undecidable manual P 328 26.3514 50 -0.03 74
IV.FDMO.HHZ. 2021-04-08T23:11:57.72 0.1 undecidable manual P 1 25.752 50 -0.06 99
IV.MMO1.EHZ. 2021-04-08T23:11:57.12 0.3 undecidable manual P 62 22.755 114 -0.18 73
IV.T1299.EHZ. 2021-04-08T23:11:57.66 0.1 undecidable manual P 139 25.1526 50 -0.03 99
IV.MC2.EHZ. 2021-04-08T23:11:56.14 0.1 undecidable manual P 37 14.874 125 0.22 97
IV.GAVE.EHZ. 2021-04-08T23:11:56.79 0.1 undecidable manual P 230 19.5693 118 0.06 100
IV.NRCA.HHZ. 2021-04-08T23:11:56.07 0.3 undecidable manual S 42 4.2957 157 -0.1 76
IV.NRCA.HHZ. 2021-04-08T23:11:54.71 0.1 undecidable manual P 42 4.2957 157 0.18 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:0.7 0.0000914753 0.0768 AML other m 2021-04-08T23:11:56.18
IV.NRCA.HHE. ML:1.2 0.000252 0.1 AML other m 2021-04-08T23:11:56.25
IV.NRCA.HNE. ML:1.2 0.000241142 0.1024 AML other m 2021-04-08T23:11:56.26
IV.GAVE.EHE. ML:0.5 0.000027319710000000003 0.2048 AML other m 2021-04-08T23:12:00.73
IV.GAVE.EHN. ML:0.6 0.00002853622 0.1408 AML other m 2021-04-08T23:12:00.72
IV.LNSS.HHE. ML:0.5 0.000017845609999999998 0.1024 AML other m 2021-04-08T23:12:01.41
IV.LNSS.HHN. ML:0.5 0.000020823795 0.1664 AML other m 2021-04-08T23:12:01.20
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