Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 20-06-2021 and time 21:46:55 (Italy) in region 4 km E Norcia (PG)

A magnitude ML 1.0 earthquake occured in region: 4 km E Norcia (PG), on

  • 20-06-2021 19:46:55 (UTC)
  • 20-06-2021 21:46:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8070, 13.1400 at 6 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 4 4957 4957
Castelsantangelo sul Nera MC 10 281 5238
Preci PG 12 724 5962
Arquata del Tronto AP 13 1178 7140
Cascia PG 14 3217 10357
Visso MC 15 1107 11464
Accumoli RI 15 667 12131
Ussita MC 15 444 12575
Montegallo AP 16 523 13098
Cerreto di Spoleto PG 18 1075 14173
Montemonaco AP 19 604 14777
Sellano PG 20 1079 15856
Poggiodomo PG 20 117 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
70 Km E of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km W of Pescara (121014 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
98 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 1.0 2021-06-20
19:46:55		 42.8067 13.1397 6 2021-12-29
11:12:31		 Bollettino Sismico Italiano INGV 95511961
Reviewed
Rev100 		ML 1.1 2021-06-20
19:46:54		 42.8135 13.1253 9 2021-06-20
20:10:15		 Sala Sismica INGV-Roma 91615921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-06-20 19:46:55 ± 0.14
Latitude 42.8067 ± 0.0027
Longitude 13.1397 ± 0.0086
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95511961

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 574
Semi-minor axis of confidence ellipse (meter) 371
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 84
Circular confidence region, given by single value of horizontal uncertainty (meter) 570.0
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 32
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34624
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 91615921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-06-20 20:10:15

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 95511961
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-16 15:20:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TOLF.HHE. 2021-06-20T19:47:23.20 3.0 undecidable manual S -7.1 0
IV.SAP2.EHN. 2021-06-20T19:47:09.35 0.6 undecidable manual S 33 38.4282 99 0.45 43
IV.RM33.EHZ. 2021-06-20T19:47:06.81 0.6 undecidable manual S 169 33.5442 100 -0.41 44
IV.SACS.HHZ. 2021-06-20T19:47:06.92 3.0 undecidable manual S -4.98 0
IV.SMA1.EHE. 2021-06-20T19:47:04.29 0.3 undecidable manual S 141 25.2525 103 -0.09 71
IV.FDMO.HHZ. 2021-06-20T19:47:04.48 0.6 undecidable manual S 351 25.8519 103 -0.12 47
IV.LNSS.HNZ. 2021-06-20T19:47:04.07 0.6 undecidable manual S 200 24.0537 104 0.09 48
IV.SAP2.EHN. 2021-06-20T19:47:03.70 1.0 undecidable manual P 33 38.4282 99 0.51 21
IV.T1299.HNE. 2021-06-20T19:47:03.94 0.3 undecidable manual S 149 22.3554 105 0.51 65
IV.MMO1.EHZ. 2021-06-20T19:47:01.73 0.3 undecidable manual S 56 18.3705 108 -0.36 68
IV.SACS.HHN. 2021-06-20T19:47:01.61 3.0 undecidable manual P 1 0
IV.RM33.EHZ. 2021-06-20T19:47:01.80 0.3 undecidable manual P 169 33.5442 100 -0.43 66
IV.CPGN.EHZ. 2021-06-20T19:47:01.00 3.0 undecidable manual P 0.96 0
IV.CSP1.EHZ. 2021-06-20T19:47:01.84 0.3 undecidable manual P 9 32.0457 100 -0.09 71
IV.MC2.EHZ. 2021-06-20T19:47:00.39 0.3 undecidable manual S 19 12.2766 116 0.26 70
IV.T1299.HNE. 2021-06-20T19:47:00.24 0.3 undecidable manual P 149 22.3554 105 0.21 70
IV.LNSS.HNZ. 2021-06-20T19:47:00.65 0.3 undecidable manual P 200 24.0537 104 0.3 69
IV.SMA1.EHE. 2021-06-20T19:47:00.42 0.3 undecidable manual P 141 25.2525 103 -0.16 70
IV.FDMO.HHZ. 2021-06-20T19:47:00.55 0.3 undecidable manual P 351 25.8519 103 -0.16 70
IV.MMO1.EHZ. 2021-06-20T19:46:59.02 0.3 undecidable manual P 56 18.3705 108 -0.24 70
IV.MC2.EHZ. 2021-06-20T19:46:58.31 0.3 undecidable manual P 19 12.2766 116 0.18 72
IV.NRCA.HNZ. 2021-06-20T19:46:57.69 0.1 undecidable manual S 325 3.5964 148 -0.1 98
IV.NRCA.HNZ. 2021-06-20T19:46:56.81 0.1 undecidable manual P 325 3.5964 148 0.03 100
IV.NARO.HHZ. 2021-06-20T19:46:54.09 3.0 undecidable manual P -0.83 0
IV.ARVD.HHZ. 2021-06-20T19:46:53.48 3.0 undecidable manual P -0.37 0
IV.PIEI.HHZ. 2021-06-20T19:46:52.83 3.0 positive manual P -0.61 0
IV.ATMI.HHZ. 2021-06-20T19:46:51.42 3.0 negative manual P -1.54 0
IV.SSFR.HHZ. 2021-06-20T19:46:51.48 3.0 negative manual P 0.12 0
IV.ATVO.HHZ. 2021-06-20T19:46:50.53 3.0 undecidable manual P -1.06 0
IV.MURB.HHN. 2021-06-20T19:46:49.33 3.0 undecidable manual P 0.82 0
IV.ASSB.HHZ. 2021-06-20T19:46:48.86 3.0 undecidable manual P -1.21 0
IV.ATCC.EHZ. 2021-06-20T19:46:47.31 3.0 undecidable manual P 0.35 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:0.9 0.00005065 0.62 AML other m 2021-06-20T19:47:05.92
IV.FDMO.HHE. ML:1.0 0.000059250000000000004 1.16 AML other m 2021-06-20T19:47:05.12
IV.SMA1.EHE. ML:1.0 0.0000724 0.36 AML other m 2021-06-20T19:47:07.68
IV.RM33.EHE. ML:0.8 0.000027950000000000002 0.56 AML other m 2021-06-20T19:47:07.63
IV.SMA1.EHN. ML:1.0 0.0000584 1.54 AML other m 2021-06-20T19:47:07.21
IV.CSP1.EHE. ML:1.2 0.00008074625 0.2944 AML other m 2021-06-20T19:47:08.35
IV.CSP1.EHN. ML:1.3 0.00009807255500000001 0.2944 AML other m 2021-06-20T19:47:09.27
IV.RM33.EHN. ML:0.9 0.00003635 0.38 AML other m 2021-06-20T19:47:09.17
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