Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 09-08-2021 and time 00:31:21 (Italy) in region 2 km NE Norcia (PG)

A magnitude ML 1.4 earthquake occured in region: 2 km NE Norcia (PG), on

  • 08-08-2021 22:31:21 (UTC)
  • 09-08-2021 00:31:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8030, 13.1080 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
Cerreto di Spoleto PG 16 1075 11361
Arquata del Tronto AP 16 1178 12539
Ussita MC 16 444 12983
Accumoli RI 17 667 13650
Poggiodomo PG 17 117 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)
97 Km SW of Ancona (100861 inhabitants)
97 Km N of Tivoli (56533 inhabitants)
98 Km W of Pescara (121014 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 1.4 2021-08-08
22:31:21		 42.8028 13.1078 10 2021-12-29
11:12:53		 Bollettino Sismico Italiano INGV 98552351
Reviewed
Rev100 		ML 1.6 2021-08-08
22:31:21		 42.8037 13.1053 10 2021-08-08
22:38:13		 Sala Sismica INGV-Roma 93861751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-08 22:31:21 ± 0.04
Latitude 42.8028 ± 0.0018
Longitude 13.1078 ± 0.0037
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 98552351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 301
Semi-minor axis of confidence ellipse (meter) 123
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 82
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 48
Number of associated phases, regardless of their use for origin computation 53
Number of defining phases 52
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.75543
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 28
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 55
Type of magnitude ML
Reference to an origin 98552351
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-15 14:10:30

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 93861751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-08 22:38:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BRSN.EHZ. 2021-08-08T22:32:13.94 3.0 undecidable manual Sg 1.87 0
IV.CING.HHZ. 2021-08-08T22:31:41.40 0.3 undecidable manual S 6 63.8916 50 0.38 65
IV.ATCC.EHZ. 2021-08-08T22:31:39.80 0.3 undecidable manual S 318 56.8986 50 0.65 61
IV.FIAM.HHZ. 2021-08-08T22:31:39.88 0.3 undecidable manual S 179 59.2962 50 0.09 70
IV.ASSB.HHZ. 2021-08-08T22:31:36.07 0.3 undecidable manual S 306 45.1215 50 0.06 72
IV.MOMA.HHZ. 2021-08-08T22:31:36.03 0.3 undecidable manual S 270 43.7229 50 0.4 68
IV.CESX.HHZ. 2021-08-08T22:31:36.57 0.3 undecidable manual S 243 47.619 50 -0.1 71
IV.T0110.HHZ. 2021-08-08T22:31:35.95 0.6 undecidable manual P 139 83.8494 50 0.25 43
IV.ARRO.EHZ. 2021-08-08T22:31:34.43 0.3 undecidable manual S 228 37.3293 50 0.51 66
IV.ARVD.HHZ. 2021-08-08T22:31:34.81 0.3 undecidable manual P 350 78.2661 50 -0.03 68
IV.GUMA.HHZ. 2021-08-08T22:31:33.24 0.3 undecidable manual S 33 34.2435 50 0.15 72
IV.CAMP.HHE. 2021-08-08T22:31:33.92 0.3 undecidable manual S 140 38.4282 50 -0.3 70
IV.MML1.EHZ. 2021-08-08T22:31:33.25 0.3 undecidable manual S 342 36.2415 50 -0.36 69
IV.MF5.EHZ. 2021-08-08T22:31:33.99 0.3 undecidable manual S 54 35.2425 50 0.64 63
IV.RM33.EHZ. 2021-08-08T22:31:32.77 0.3 undecidable manual S 165 33.744 50 -0.18 72
IV.CING.HHZ. 2021-08-08T22:31:32.49 0.3 undecidable manual P 6 63.8916 50 -0.14 69
IV.CSP1.EHZ. 2021-08-08T22:31:32.37 0.3 undecidable manual S 14 33.0447 50 -0.4 69
IV.ATCC.EHZ. 2021-08-08T22:31:31.53 0.3 undecidable manual P 318 56.8986 50 -0.02 71
IV.FIAM.HHZ. 2021-08-08T22:31:31.25 0.3 undecidable manual P 179 59.2962 50 -0.67 60
IV.CESI.HHZ. 2021-08-08T22:31:31.04 0.6 undecidable manual S 324 27.8499 50 -0.35 47
IV.FDMO.HHZ. 2021-08-08T22:31:30.18 0.3 undecidable manual S 356 25.9518 110 -0.61 65
IV.CESX.HHZ. 2021-08-08T22:31:30.04 0.3 undecidable manual P 243 47.619 50 -0.08 72
IV.SMA1.EHZ. 2021-08-08T22:31:30.89 0.3 undecidable manual S 136 26.6511 110 -0.1 74
IV.MNTT.EHZ. 2021-08-08T22:31:30.95 0.1 undecidable manual P 54 48.9177 50 0.63 83
IV.T1299.EHN. 2021-08-08T22:31:30.22 0.3 undecidable manual S 143 23.4543 112 0.24 72
IV.TERO.HHZ. 2021-08-08T22:31:29.54 0.3 undecidable manual P 116 45.1215 50 -0.19 70
IV.GAVE.EHZ. 2021-08-08T22:31:29.29 0.3 undecidable manual S 235 21.2676 114 0.01 76
IV.LNSS.HHZ. 2021-08-08T22:31:29.70 0.3 undecidable manual S 194 22.8549 113 -0.07 75
IV.MTRA.EHZ. 2021-08-08T22:31:29.79 0.3 undecidable manual S 102 24.0537 112 -0.37 70
IV.ASSB.HHZ. 2021-08-08T22:31:29.64 0.3 undecidable manual P 306 45.1215 50 -0.09 72
IV.MOMA.HHZ. 2021-08-08T22:31:29.71 0.3 undecidable manual P 270 43.7229 50 0.19 71
IT.MTCL.HGZ. 2021-08-08T22:31:29.40 0.3 undecidable manual S 337 22.9548 113 -0.41 70
IV.MML1.EHZ. 2021-08-08T22:31:28.13 0.1 undecidable manual P 342 36.2415 50 -0.22 95
IV.MF5.EHZ. 2021-08-08T22:31:28.35 0.1 undecidable manual P 54 35.2425 50 0.15 96
IV.ARRO.EHZ. 2021-08-08T22:31:28.41 0.1 undecidable manual P 228 37.3293 50 -0.12 96
IV.FEMA.HNZ. 2021-08-08T22:31:28.27 0.3 undecidable manual S 345 18.2706 118 -0.07 76
IV.GUMA.HHZ. 2021-08-08T22:31:28.10 0.1 undecidable manual P 33 34.2435 50 0.05 98
IV.CAMP.HHE. 2021-08-08T22:31:28.51 0.3 undecidable manual P 140 38.4282 50 -0.2 71
IV.CSP1.EHZ. 2021-08-08T22:31:27.58 0.1 undecidable manual P 14 33.0447 50 -0.29 94
IV.MC2.EHZ. 2021-08-08T22:31:27.51 0.3 undecidable manual S 29 13.7751 125 0.52 69
IV.RM33.EHZ. 2021-08-08T22:31:27.64 0.3 undecidable manual P 165 33.744 50 -0.34 70
IV.MTRA.EHZ. 2021-08-08T22:31:26.24 0.3 undecidable manual P 102 24.0537 112 -0.12 74
IV.CESI.HHZ. 2021-08-08T22:31:26.92 0.1 undecidable manual P 324 27.8499 50 -0.15 98
IV.T1299.EHN. 2021-08-08T22:31:26.49 0.1 undecidable manual P 143 23.4543 112 0.23 97
IT.MTCL.HGZ. 2021-08-08T22:31:26.04 0.1 undecidable manual P 337 22.9548 113 -0.12 99
IV.FDMO.HHZ. 2021-08-08T22:31:26.52 0.1 positive manual P 356 25.9518 110 -0.2 97
IV.GAVE.EHZ. 2021-08-08T22:31:26.04 0.1 undecidable manual P 235 21.2676 114 0.19 98
IV.SMA1.EHZ. 2021-08-08T22:31:26.75 0.1 undecidable manual P 136 26.6511 110 -0.09 99
IV.LNSS.HHZ. 2021-08-08T22:31:26.21 0.1 undecidable manual P 194 22.8549 113 0.07 100
IV.FEMA.HNZ. 2021-08-08T22:31:25.46 0.3 undecidable manual P 345 18.2706 118 0.15 74
IV.NRCA.HNZ. 2021-08-08T22:31:24.75 0.3 undecidable manual S 9 3.4965 160 0.03 78
IV.MC2.EHZ. 2021-08-08T22:31:24.80 0.1 positive manual P 29 13.7751 125 0.26 98
IV.NRCA.HNZ. 2021-08-08T22:31:23.52 0.1 undecidable manual P 9 3.4965 160 0.3 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:2.5 0.00584202 0.0896 AML other m 2021-08-08T22:31:24.87
IV.NRCA.HHN. ML:2.5 0.006725 0.08 AML other m 2021-08-08T22:31:24.87
IV.NRCA.HHE. ML:2.1 0.002516152 0.064 AML other m 2021-08-08T22:31:24.84
IV.NRCA.HNE. ML:2.1 0.0025962880000000004 0.064 AML other m 2021-08-08T22:31:24.87
IV.LNSS.HHE. ML:2.0 0.0006235459 0.128 AML other m 2021-08-08T22:31:30.78
IV.FDMO.HHE. ML:1.5 0.000176 0.36 AML other m 2021-08-08T22:31:30.60
IV.LNSS.HHN. ML:2.0 0.0007099999999999999 0.14 AML other m 2021-08-08T22:31:30.64
IV.FDMO.HHN. ML:1.6 0.00020840629999999998 0.1664 AML other m 2021-08-08T22:31:30.78
IV.CESI.HHN. ML:1.3 0.0001141899 0.1664 AML other m 2021-08-08T22:31:32.36
IV.MTRA.EHN. ML:1.4 0.00016316895 0.0256 AML other m 2021-08-08T22:31:30.38
IV.CESI.HHE. ML:1.1 0.00006462804 0.1152 AML other m 2021-08-08T22:31:32.16
IV.MTRA.EHE. ML:1.4 0.00014919895 0.1152 AML other m 2021-08-08T22:31:30.43
IV.CSP1.EHE. ML:1.7 0.000229400455 0.1536 AML other m 2021-08-08T22:31:33.08
IV.CSP1.EHN. ML:1.7 0.0002261571 0.1792 AML other m 2021-08-08T22:31:32.76
IV.RM33.EHE. ML:1.4 0.000122 0.18 AML other m 2021-08-08T22:31:33.48
IV.RM33.EHN. ML:1.4 0.00009562256499999999 0.064 AML other m 2021-08-08T22:31:33.65
IV.MML1.EHE. ML:1.3 0.0000748 0.14 AML other m 2021-08-08T22:31:33.99
IV.GUMA.HHN. ML:1.7 0.0002133797 0.1664 AML other m 2021-08-08T22:31:34.09
IV.MML1.EHN. ML:1.2 0.00006364445000000001 0.1536 AML other m 2021-08-08T22:31:33.61
IV.SMA1.EHE. ML:1.4 0.00014019075 0.1664 AML other m 2021-08-08T22:31:32.08
IV.SMA1.EHN. ML:1.3 0.00011697742999999999 0.128 AML other m 2021-08-08T22:31:32.56
IV.MOMA.HHN. ML:1.3 0.00006379999999999999 0.18 AML other m 2021-08-08T22:31:36.56
IV.MOMA.HHE. ML:1.4 0.00006780708 0.192 AML other m 2021-08-08T22:31:36.79
IV.ASSB.HHN. ML:1.3 0.00005715000000000001 0.14 AML other m 2021-08-08T22:31:37.90
IV.GUMA.HHE. ML:1.6 0.00017964514999999998 0.2176 AML other m 2021-08-08T22:31:35.85
IV.CESX.HHE. ML:1.2 0.000048049999999999996 0.62 AML other m 2021-08-08T22:31:38.59
IV.CESX.HHN. ML:1.4 0.0000628 0.34 AML other m 2021-08-08T22:31:38.73
IV.MNTT.EHN. ML:0.0 0.00026360935 0.256 AML other m 2021-08-08T22:31:39.42
IV.ASSB.HHE. ML:1.1 0.00003605329 0.2304 AML other m 2021-08-08T22:31:37.87
IV.FIAM.HHE. ML:0.9 0.0000165 0.2 AML other m 2021-08-08T22:31:40.67
IV.FIAM.HHN. ML:0.9 0.000013817204999999999 0.2176 AML other m 2021-08-08T22:31:41.12
IV.MNTT.EHE. ML:0.0 0.00042831635 0.1408 AML other m 2021-08-08T22:31:41.52
IV.LNSS.HNN. ML:2.0 0.0006463483 0.1408 AML other m 2021-08-08T22:31:30.64
IV.LNSS.HNE. ML:1.9 0.0005436220499999999 0.128 AML other m 2021-08-08T22:31:30.72
IV.MTRA.HNE. ML:1.4 0.00014458195000000002 0.1408 AML other m 2021-08-08T22:31:30.49
IV.MTRA.HNN. ML:1.4 0.00014602015 0.1536 AML other m 2021-08-08T22:31:30.37
IV.CESI.HNE. ML:1.1 0.00006117810499999999 0.1152 AML other m 2021-08-08T22:31:32.15
IV.CESI.HNN. ML:1.3 0.000093536775 0.1536 AML other m 2021-08-08T22:31:32.44
IV.RM33.HNN. ML:1.4 0.000108613775 0.0768 AML other m 2021-08-08T22:31:33.65
IV.RM33.HNE. ML:1.6 0.0001557105 0.1792 AML other m 2021-08-08T22:31:33.47
IV.GUMA.HNE. ML:1.7 0.0001933869 0.1536 AML other m 2021-08-08T22:31:34.09
IV.GUMA.HNN. ML:1.8 0.00026089820000000004 0.2432 AML other m 2021-08-08T22:31:35.16
IV.MML1.HNN. ML:1.2 0.00006286285999999999 0.1792 AML other m 2021-08-08T22:31:34.36
IV.MML1.HNE. ML:1.2 0.00006905193 0.1408 AML other m 2021-08-08T22:31:33.97
IV.MF5.EHE. ML:1.5 0.00012151099 0.2048 AML other m 2021-08-08T22:31:34.42
IV.MF5.EHN. ML:1.4 0.00011021053 0.2048 AML other m 2021-08-08T22:31:34.53
IV.TERO.HNE. ML:1.3 0.00005316087 0.064 AML other m 2021-08-08T22:31:37.47
IV.TERO.HNN. ML:1.3 0.000059734294999999995 0.0896 AML other m 2021-08-08T22:31:37.34
IV.TERO.HHN. ML:1.3 0.00006239435 0.0768 AML other m 2021-08-08T22:31:38.84
IV.ATCC.EHN. ML:1.0 0.000026476395 0.2048 AML other m 2021-08-08T22:31:43.58
IV.ATCC.EHE. ML:1.2 0.000033211349500000004 0.1792 AML other m 2021-08-08T22:31:41.20
IV.CING.HHN. ML:1.2 0.00002885392 0.2432 AML other m 2021-08-08T22:31:45.34
IV.CING.HHE. ML:1.3 0.000035614765 0.2048 AML other m 2021-08-08T22:31:42.85
IV.ARVD.HHN. ML:0.8 0.000009294948999999999 0.1408 AML other m 2021-08-08T22:31:47.05
IV.ARVD.HHE. ML:1.2 0.00001831488 0.192 AML other m 2021-08-08T22:31:47.53
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