Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 22-04-2021 and time 06:23:00 (Italy) in region 2 km NE Norcia (PG)

A magnitude ML 1.7 earthquake occured in region: 2 km NE Norcia (PG), on

  • 22-04-2021 04:23:00 (UTC)
  • 22-04-2021 06:23:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8040, 13.1100 at 10 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 2 4957 4957
Preci PG 10 724 5681
Castelsantangelo sul Nera MC 11 281 5962
Cascia PG 12 3217 9179
Visso MC 14 1107 10286
Arquata del Tronto AP 16 1178 11464
Cerreto di Spoleto PG 16 1075 12539
Ussita MC 16 444 12983
Accumoli RI 17 667 13650
Poggiodomo PG 18 117 13767
Sellano PG 18 1079 14846
Montegallo AP 19 523 15369

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
51 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
97 Km N of Tivoli (56533 inhabitants)
98 Km W of Pescara (121014 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 1.7 2021-04-22
04:23:00		 42.8037 13.1105 10 2021-07-12
16:55:16		 Bollettino Sismico Italiano INGV 91710201
Reviewed
Rev100 		ML 1.7 2021-04-22
04:23:00		 42.8073 13.1148 11 2021-04-22
04:28:15		 Sala Sismica INGV-Roma 89347651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-22 04:23:00 ± 0.04
Latitude 42.8037 ± 0.0027
Longitude 13.1105 ± 0.0049
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91710201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 358
Semi-minor axis of confidence ellipse (meter) 131
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 255
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 71
Number of associated phases, regardless of their use for origin computation 51
Number of defining phases 49
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.76712
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 29
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 91710201
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-22 13:53:52

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 89347651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-22 04:28:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SEI.HHZ. 2021-04-22T04:23:58.03 3.0 undecidable manual Sg 3.52 0
IV.RIBO.EHZ.01 2021-04-22T04:23:49.55 3.0 undecidable manual Sn 1.32 0
IV.EL6.EHZ. 2021-04-22T04:23:18.87 0.6 undecidable manual S 359 58.2972 50 0.53 42
IV.FRON.EHZ. 2021-04-22T04:23:14.92 0.3 undecidable manual P 339 85.1481 50 0.16 65
IV.SAP2.EHE. 2021-04-22T04:23:14.29 0.6 undecidable manual S 36 40.0266 50 0.82 38
IV.ARVD.HHZ. 2021-04-22T04:23:13.91 0.3 undecidable manual P 350 78.2661 50 0.21 65
IV.MURB.HHZ. 2021-04-22T04:23:12.64 0.3 undecidable manual P 317 69.6747 50 0.26 66
IV.GUMA.HHZ. 2021-04-22T04:23:12.06 0.6 undecidable manual S 32 34.0437 50 0.2 47
IV.MF5.EHZ. 2021-04-22T04:23:12.76 0.6 undecidable manual S 54 34.9428 50 0.66 42
IV.MML1.HNE. 2021-04-22T04:23:12.15 0.6 undecidable manual S 342 36.1416 50 -0.27 46
IV.CAMP.HHE. 2021-04-22T04:23:12.73 0.6 undecidable manual S 141 38.4282 50 -0.29 46
IV.CSP1.EHZ. 2021-04-22T04:23:11.21 0.6 undecidable manual S 13 32.8449 50 -0.33 46
IV.RM33.EHZ. 2021-04-22T04:23:11.70 0.6 undecidable manual S 165 33.744 50 -0.09 48
IV.EL6.EHZ. 2021-04-22T04:23:10.51 0.1 undecidable manual P 359 58.2972 50 -0.12 92
IV.CESI.HHZ. 2021-04-22T04:23:10.04 0.6 undecidable manual S 323 27.8499 50 -0.18 48
IV.ATCC.EHZ. 2021-04-22T04:23:10.49 0.3 undecidable manual P 318 56.9985 50 0.06 70
IV.SMA1.EHZ. 2021-04-22T04:23:09.61 0.6 undecidable manual S 136 26.5512 50 -0.25 47
IV.MNTT.EHZ. 2021-04-22T04:23:09.97 0.3 undecidable manual P 54 48.7179 50 0.82 57
IV.FDMO.HHZ. 2021-04-22T04:23:09.17 0.6 undecidable manual S 356 25.8519 50 -0.51 45
IV.SNTG.HHZ. 2021-04-22T04:23:09.53 0.3 undecidable manual P 345 51.9036 50 -0.11 70
IV.T1299.HNN. 2021-04-22T04:23:08.96 0.6 undecidable manual S 143 23.4543 113 0 50
IT.MTCL.HGZ. 2021-04-22T04:23:08.32 0.6 undecidable manual S 337 22.9548 114 -0.48 45
IV.MTRA.EHZ. 2021-04-22T04:23:08.99 0.6 undecidable manual S 103 23.8539 113 -0.1 49
IV.SAP2.EHE. 2021-04-22T04:23:08.16 0.3 undecidable manual P 36 40.0266 50 0.34 68
IV.ASSB.HHZ. 2021-04-22T04:23:08.54 0.3 undecidable manual P 306 45.2214 50 -0.08 71
IV.GAVE.EHZ. 2021-04-22T04:23:08.56 0.6 undecidable manual S 235 21.5673 115 0.2 48
IV.LNSS.HHZ. 2021-04-22T04:23:08.91 0.6 undecidable manual S 194 22.9548 114 0.09 49
IV.TERO.HHZ. 2021-04-22T04:23:08.29 0.3 undecidable manual P 116 44.9217 50 -0.28 68
IV.ARRO.EHZ. 2021-04-22T04:23:07.50 0.3 undecidable manual P 229 37.5291 50 0.07 72
IV.CAMP.HHE. 2021-04-22T04:23:07.33 0.1 undecidable manual P 141 38.4282 50 -0.23 93
IV.FEMA.HNE. 2021-04-22T04:23:07.13 0.6 undecidable manual S 344 18.2706 119 -0.21 49
IV.MF5.EHZ. 2021-04-22T04:23:07.25 0.3 undecidable manual P 54 34.9428 50 0.22 71
IV.MMO1.EHZ. 2021-04-22T04:23:07.64 0.6 undecidable manual S 59 20.5683 116 -0.41 46
IV.MML1.HNE. 2021-04-22T04:23:07.03 0.1 undecidable manual P 342 36.1416 50 -0.19 95
IV.CSP1.EHZ. 2021-04-22T04:23:06.50 0.1 positive manual P 13 32.8449 50 -0.21 95
IV.RM33.EHZ. 2021-04-22T04:23:06.71 0.1 undecidable manual P 165 33.744 50 -0.14 96
IV.GUMA.HHZ. 2021-04-22T04:23:06.97 0.1 undecidable manual P 32 34.0437 50 0.08 97
IV.MC2.EHZ. 2021-04-22T04:23:06.21 0.6 undecidable manual S 28 13.5753 127 0.24 49
IV.LNSS.HHZ. 2021-04-22T04:23:05.26 0.1 positive manual P 194 22.9548 114 0.13 98
IV.FDMO.HHZ. 2021-04-22T04:23:05.42 0.1 positive manual P 356 25.8519 50 -0.21 96
IV.T1299.HNN. 2021-04-22T04:23:05.34 0.1 undecidable manual P 143 23.4543 113 0.13 98
IV.MTRA.EHZ. 2021-04-22T04:23:05.09 0.3 undecidable manual P 103 23.8539 113 -0.2 72
IV.SMA1.EHZ. 2021-04-22T04:23:05.60 0.3 undecidable manual P 136 26.5512 50 -0.13 73
IV.GAVE.EHZ. 2021-04-22T04:23:05.16 0.1 negative manual P 235 21.5673 115 0.29 95
IV.CESI.HHZ. 2021-04-22T04:23:05.90 0.1 positive manual P 323 27.8499 50 -0.04 99
IV.MMO1.EHZ. 2021-04-22T04:23:04.46 0.1 undecidable manual P 59 20.5683 116 -0.23 96
IT.MTCL.HGZ. 2021-04-22T04:23:04.94 0.1 undecidable manual P 337 22.9548 114 -0.18 97
IV.FEMA.HNE. 2021-04-22T04:23:04.35 0.1 undecidable manual P 344 18.2706 119 0.07 100
IV.MC2.EHZ. 2021-04-22T04:23:03.65 0.1 positive manual P 28 13.5753 127 0.16 99
IV.NRCA.HHZ. 2021-04-22T04:23:03.65 0.6 undecidable manual S 5 3.2967 162 -0.14 50
IV.NRCA.HHZ. 2021-04-22T04:23:02.42 0.1 undecidable manual P 5 3.2967 162 0.19 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:2.6 0.00683 0.14 AML other m 2021-04-22T04:23:03.80
IV.NRCA.HNN. ML:2.5 0.006345000000000001 0.14 AML other m 2021-04-22T04:23:03.80
IV.NRCA.HHE. ML:2.3 0.00392 0.48 AML other m 2021-04-22T04:23:04.16
IV.NRCA.HNE. ML:2.3 0.00377 0.48 AML other m 2021-04-22T04:23:04.17
IV.FDMO.HHN. ML:1.8 0.0004055 0.46 AML other m 2021-04-22T04:23:09.42
IV.GAVE.EHN. ML:1.9 0.000528 0.16 AML other m 2021-04-22T04:23:09.42
IV.MTRA.EHN. ML:1.5 0.00020250000000000002 0.36 AML other m 2021-04-22T04:23:09.85
IV.LNSS.HHE. ML:2.0 0.000621 0.16 AML other m 2021-04-22T04:23:09.93
IV.MTRA.EHE. ML:1.5 0.0001865 1.08 AML other m 2021-04-22T04:23:09.96
IV.CESI.HHE. ML:1.8 0.00034599999999999995 0.14 AML other m 2021-04-22T04:23:10.13
IV.LNSS.HHN. ML:2.0 0.000737 0.22 AML other m 2021-04-22T04:23:10.22
IV.GAVE.EHE. ML:1.9 0.000569 0.2 AML other m 2021-04-22T04:23:10.34
IV.CESI.HHN. ML:2.0 0.0005765 0.54 AML other m 2021-04-22T04:23:10.54
IV.FDMO.HHE. ML:1.8 0.00036899999999999997 0.18 AML other m 2021-04-22T04:23:10.66
IV.SMA1.EHN. ML:1.6 0.0002265 0.28 AML other m 2021-04-22T04:23:11.38
IV.CSP1.EHN. ML:2.0 0.00048699999999999997 0.54 AML other m 2021-04-22T04:23:11.72
IV.CSP1.EHE. ML:2.0 0.00045000000000000004 0.42 AML other m 2021-04-22T04:23:11.92
IV.GUMA.HHN. ML:1.9 0.00034950000000000004 0.88 AML other m 2021-04-22T04:23:12.89
IV.RM33.EHN. ML:1.5 0.00013700000000000002 0.46 AML other m 2021-04-22T04:23:12.99
IV.RM33.EHE. ML:1.5 0.0001245 0.12 AML other m 2021-04-22T04:23:13.07
IV.SMA1.EHE. ML:1.8 0.000357 0.4 AML other m 2021-04-22T04:23:13.32
IV.ARRO.EHN. ML:1.4 0.00010314999999999999 0.34 AML other m 2021-04-22T04:23:14.55
IV.TERO.HHN. ML:1.2 0.000050950000000000005 0.56 AML other m 2021-04-22T04:23:14.52
IV.ASSB.HHE. ML:1.4 0.00006945 1.46 AML other m 2021-04-22T04:23:15.03
IV.GUMA.HHE. ML:2.0 0.0003705 0.54 AML other m 2021-04-22T04:23:16.52
IV.ARRO.EHE. ML:1.2 0.00006654999999999999 0.52 AML other m 2021-04-22T04:23:16.46
IV.ASSB.HHN. ML:1.4 0.00007439999999999999 0.6 AML other m 2021-04-22T04:23:16.66
IV.TERO.HHE. ML:1.3 0.00005715 0.14 AML other m 2021-04-22T04:23:16.67
IV.SNTG.HHN. ML:1.3 0.000045650000000000005 1.4 AML other m 2021-04-22T04:23:18.94
IV.EL6.EHN. ML:1.8 0.000143 0.24 AML other m 2021-04-22T04:23:19.95
IV.SNTG.HHE. ML:1.2 0.00004145 1.22 AML other m 2021-04-22T04:23:20.26
IV.ATCC.EHE. ML:1.4 0.0000606 0.88 AML other m 2021-04-22T04:23:20.52
IV.ATCC.EHN. ML:1.5 0.0000654 1.36 AML other m 2021-04-22T04:23:20.27
IV.EL6.EHE. ML:1.7 0.00011555 1.44 AML other m 2021-04-22T04:23:21.74
IV.MURB.HHE. ML:1.8 0.0000968 0.26 AML other m 2021-04-22T04:23:25.38
IV.ARVD.HHN. ML:1.2 0.000025399999999999997 0.94 AML other m 2021-04-22T04:23:26.76
IV.ARVD.HHE. ML:1.3 0.000028499999999999998 0.88 AML other m 2021-04-22T04:23:26.79
IV.FRON.EHE. ML:1.4 0.0000293 0.42 AML other m 2021-04-22T04:23:28.43
IV.MURB.HHN. ML:1.6 0.00007255 0.32 AML other m 2021-04-22T04:23:31.37
IV.FRON.EHN. ML:1.4 0.000037449999999999995 0.64 AML other m 2021-04-22T04:23:34.69
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