Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 11-04-2021 and time 05:34:31 (UTC) in region 3 km NE Norcia (PG)

A magnitude ML 1.2 earthquake occured in region: 3 km NE Norcia (PG), on

  • 11-04-2021 05:34:31 (UTC)
  • 11-04-2021 07:34:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8090, 13.1200 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 3 4957 4957
Castelsantangelo sul Nera MC 10 281 5238
Preci PG 10 724 5962
Cascia PG 13 3217 9179
Visso MC 14 1107 10286
Arquata del Tronto AP 15 1178 11464
Ussita MC 15 444 11908
Accumoli RI 16 667 12575
Cerreto di Spoleto PG 17 1075 13650
Montegallo AP 18 523 14173
Sellano PG 18 1079 15252
Poggiodomo PG 19 117 15369
Montemonaco AP 20 604 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
51 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
68 Km E of Perugia (166134 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
97 Km W of Pescara (121014 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
100 Km NW of Chieti (51815 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 1.2 2021-04-11
05:34:31		 42.809 13.1205 11 2021-07-12
16:55:16		 Bollettino Sismico Italiano INGV 91702371
Reviewed
Rev100 		ML 1.2 2021-04-11
05:34:31		 42.8098 13.1148 11 2021-04-11
05:38:11		 Sala Sismica INGV-Roma 88994861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-11 05:34:31 ± 0.04
Latitude 42.8090 ± 0.0018
Longitude 13.1205 ± 0.0037
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 91702371

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 310
Semi-minor axis of confidence ellipse (meter) 135
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 259
Circular confidence region, given by single value of horizontal uncertainty (meter) 310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 125
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40110
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 91702371
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-22 10:18:40

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 88994861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-11 05:38:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BARO.EHZ. 2021-04-11T05:34:52.13 3.0 positive manual P 1.57 0
IV.TERO.HHZ. 2021-04-11T05:34:45.60 0.6 undecidable manual S 117 44.5221 50 -0.09 46
IV.RM33.EHZ. 2021-04-11T05:34:43.14 0.6 undecidable manual S 167 34.1436 50 0.21 46
IV.CSP1.EHZ. 2021-04-11T05:34:42.41 0.6 undecidable manual S 12 32.1456 50 0.02 47
IV.CESI.HHZ. 2021-04-11T05:34:41.33 0.6 undecidable manual S 321 27.9498 50 0.06 47
IV.LNSS.HHZ. 2021-04-11T05:34:40.10 0.6 undecidable manual S 196 23.754 50 -0.06 48
IV.FDMO.HHZ. 2021-04-11T05:34:40.44 0.6 undecidable manual S 354 25.3524 50 -0.15 47
IV.T1299.HNN. 2021-04-11T05:34:40.16 0.6 undecidable manual S 146 23.4543 50 0.09 48
IV.SMA1.EHZ. 2021-04-11T05:34:40.77 0.6 undecidable manual S 138 26.4513 50 -0.1 47
IV.TERO.HHZ. 2021-04-11T05:34:39.68 0.3 undecidable manual P 117 44.5221 50 0.06 69
IV.MMO1.EHZ. 2021-04-11T05:34:38.89 0.6 undecidable manual S 59 19.5693 50 -0.14 47
IV.CESI.HHZ. 2021-04-11T05:34:37.16 0.3 undecidable manual P 321 27.9498 50 0.09 71
IV.CSP1.EHZ. 2021-04-11T05:34:37.72 0.1 undecidable manual P 12 32.1456 50 0.01 95
IV.MC2.EHZ. 2021-04-11T05:34:37.35 0.6 undecidable manual S 26 12.6762 131 0.2 47
IV.RM33.EHZ. 2021-04-11T05:34:37.89 0.3 undecidable manual P 167 34.1436 50 -0.14 69
IV.SMA1.EHZ. 2021-04-11T05:34:36.80 0.3 undecidable manual P 138 26.4513 50 -0.04 72
IV.LNSS.HHZ. 2021-04-11T05:34:36.43 0.3 undecidable manual P 196 23.754 50 0 73
IV.FDMO.HHZ. 2021-04-11T05:34:36.63 0.1 undecidable manual P 354 25.3524 50 -0.05 96
IV.T1299.HNN. 2021-04-11T05:34:36.46 0.1 undecidable manual P 146 23.4543 50 0.08 95
IV.MMO1.EHZ. 2021-04-11T05:34:35.75 0.1 undecidable manual P 59 19.5693 50 -0.03 97
IV.MC2.EHZ. 2021-04-11T05:34:34.84 0.1 undecidable manual P 26 12.6762 131 0.15 96
IV.NRCA.HHZ. 2021-04-11T05:34:34.88 0.6 undecidable manual S 349 2.7972 166 -0.38 46
IV.NRCA.HHZ. 2021-04-11T05:34:33.62 0.1 undecidable manual P 349 2.7972 166 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:1.5 0.000496 0.14 AML other m 2021-04-11T05:34:34.99
IV.NRCA.HHN. ML:1.5 0.0005420000000000001 0.14 AML other m 2021-04-11T05:34:34.99
IV.NRCA.HHE. ML:1.4 0.00039449999999999994 0.1 AML other m 2021-04-11T05:34:35.59
IV.NRCA.HNE. ML:1.4 0.000377 0.08 AML other m 2021-04-11T05:34:35.59
IV.LNSS.HHE. ML:1.2 0.0000854 1.54 AML other m 2021-04-11T05:34:40.01
IV.LNSS.HHN. ML:1.1 0.000071 1.2 AML other m 2021-04-11T05:34:41.70
IV.FDMO.HHN. ML:0.8 0.000041349999999999995 0.58 AML other m 2021-04-11T05:34:41.87
IV.FDMO.HHE. ML:0.8 0.000034200000000000005 0.42 AML other m 2021-04-11T05:34:41.80
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