Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 31-08-2021 and time 19:56:13 (Italy) in region 5 km SW Preci (PG)

A magnitude ML 1.7 earthquake occured in region: 5 km SW Preci (PG), on

  • 31-08-2021 17:56:13 (UTC)
  • 31-08-2021 19:56:13 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8370, 13.0220 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
Preci PG 5 724 724
Norcia PG 8 4957 5681
Cerreto di Spoleto PG 9 1075 6756
Sellano PG 10 1079 7835
Visso MC 12 1107 8942
Castelsantangelo sul Nera MC 13 281 9223
Cascia PG 13 3217 12440
Vallo di Nera PG 15 364 12804
Ussita MC 15 444 13248
Poggiodomo PG 16 117 13365
Monte Cavallo MC 18 145 13510
Sant'Anatolia di Narco PG 19 564 14074
Campello sul Clitunno PG 20 2442 16516

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km E of Foligno (57155 inhabitants)
43 Km NE of Terni (111501 inhabitants)
59 Km W of Teramo (54892 inhabitants)
60 Km SE of Perugia (166134 inhabitants)
62 Km NW of L'Aquila (69753 inhabitants)
88 Km NE of Viterbo (67173 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
96 Km N of Guidonia Montecelio (88673 inhabitants)
99 Km N of Tivoli (56533 inhabitants)
99 Km W of Montesilvano (53738 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 2021-08-31
17:56:13		 42.8372 13.0215 10 2021-12-29
11:12:52		 Bollettino Sismico Italiano INGV 97694101
Reviewed
Rev100 		ML 1.8 2021-08-31
17:56:13		 42.8373 13.0198 10 2021-08-31
18:04:08		 Sala Sismica INGV-Roma 94883921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-31 17:56:13 ± 0.04
Latitude 42.8372 ± 0.0018
Longitude 13.0215 ± 0.0025
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 97694101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 203
Semi-minor axis of confidence ellipse (meter) 186
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 291
Circular confidence region, given by single value of horizontal uncertainty (meter) 200.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 36
Number of associated phases, regardless of their use for origin computation 63
Number of defining phases 61
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.82378
Number of stations at which the event was observed 39
Number of stations from which data was used for origin computation 37
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.1
Num. used stations 18
Type of magnitude ML
Reference to an origin 97694101
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-22 17:14:23

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 94883921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-31 18:04:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIUL.HHZ. 2021-08-31T17:56:53.27 3.0 undecidable manual S -0.52 0
IV.VIVA.HHZ. 2021-08-31T17:56:35.58 3.0 positive manual P 2.18 0
IV.EL6.EHZ. 2021-08-31T17:56:31.22 0.3 undecidable manual S 7 55.0005 50 0.36 66
IV.TERO.HHZ. 2021-08-31T17:56:30.13 0.6 undecidable manual S 116 53.1024 50 -0.23 45
IV.ATCC.HNN. 2021-08-31T17:56:29.79 0.3 undecidable manual S 321 49.5171 50 0.4 66
IV.T0110.HHZ. 2021-08-31T17:56:29.39 1.0 undecidable manual P 137 91.4418 50 0.25 21
IV.VCEL.EHZ. 2021-08-31T17:56:28.18 0.6 undecidable manual P 126 82.9503 50 0.34 42
IV.CESX.HHZ. 2021-08-31T17:56:27.73 0.6 undecidable manual S 235 43.623 50 -0.09 47
IV.SAP2.EHE. 2021-08-31T17:56:27.81 1.0 undecidable manual S 47 42.0246 50 0.4 22
IV.RM33.EHZ. 2021-08-31T17:56:26.87 0.3 undecidable manual S 157 39.627 50 0.1 71
IV.ATSC.EHE. 2021-08-31T17:56:26.10 0.3 undecidable manual P 337 70.4739 50 0.18 66
IV.MGAB.HHZ. 2021-08-31T17:56:26.77 1.0 undecidable manual P 277 74.37 50 0.25 22
IV.SSFR.HHN. 2021-08-31T17:56:26.36 0.6 undecidable manual P 344 69.1752 50 0.64 39
IV.MOMA.HHZ. 2021-08-31T17:56:26.44 0.3 undecidable manual S 264 36.9297 50 0.4 67
IV.PF6.EHE. 2021-08-31T17:56:25.41 0.3 undecidable manual S 23 36.1416 50 -0.43 67
IV.MURB.HHZ. 2021-08-31T17:56:25.06 1.0 undecidable manual P 320 62.0934 50 0.44 21
IV.ARRO.EHZ. 2021-08-31T17:56:25.35 0.3 undecidable manual S 216 35.4423 50 -0.29 69
IV.ASSB.HHZ. 2021-08-31T17:56:25.99 0.3 undecidable manual S 308 37.2294 50 -0.14 71
IV.SMA1.EHZ. 2021-08-31T17:56:25.36 0.6 undecidable manual S 132 34.3434 50 0.01 49
IV.T1299.EHE. 2021-08-31T17:56:24.85 0.3 undecidable manual S 137 30.9468 50 0.4 68
IV.OFFI.HHE. 2021-08-31T17:56:24.46 1.0 undecidable manual P 78 55.1004 50 0.92 18
IV.CSP1.EHZ. 2021-08-31T17:56:24.50 0.3 undecidable manual S 28 31.9458 50 -0.21 71
IV.MTRA.EHZ. 2021-08-31T17:56:24.64 0.6 undecidable manual S 106 31.8459 50 -0.04 49
IV.GIGS.HHN. 2021-08-31T17:56:24.49 0.6 undecidable manual P 133 61.9935 50 -0.12 46
IV.MML1.EHZ. 2021-08-31T17:56:24.47 0.6 undecidable manual S 353 30.9468 50 0.03 49
IV.CING.HNZ. 2021-08-31T17:56:24.92 0.6 undecidable manual P 13 61.3941 50 0.41 43
IV.EL6.EHZ. 2021-08-31T17:56:23.45 0.6 undecidable manual P 7 55.0005 50 -0.08 46
IV.TERO.HHZ. 2021-08-31T17:56:23.02 0.3 negative manual P 116 53.1024 50 -0.22 68
IV.LNSS.HHZ. 2021-08-31T17:56:22.86 0.6 undecidable manual S 177 26.0517 50 -0.28 47
IV.ATCC.HNN. 2021-08-31T17:56:22.58 0.1 undecidable manual P 321 49.5171 50 -0.1 93
IV.MMO1.EHZ. 2021-08-31T17:56:22.75 0.6 undecidable manual S 74 25.752 50 -0.31 47
IV.CESI.HHZ. 2021-08-31T17:56:21.37 0.6 undecidable manual S 333 20.868 116 -0.2 48
IV.CESX.HHZ. 2021-08-31T17:56:21.56 0.6 positive manual P 235 43.623 50 -0.21 46
IV.FDMO.HHZ. 2021-08-31T17:56:21.99 0.6 undecidable manual S 14 22.755 114 -0.17 48
IV.MF5.EHZ. 2021-08-31T17:56:21.41 0.1 undecidable manual P 65 39.3273 50 0.29 92
IV.SAP2.EHE. 2021-08-31T17:56:21.91 1.0 undecidable manual P 47 42.0246 50 0.37 22
IV.GAVE.EHZ. 2021-08-31T17:56:20.95 0.6 undecidable manual S 213 19.1697 118 -0.08 50
IV.ASSB.HHZ. 2021-08-31T17:56:20.56 0.1 positive manual P 308 37.2294 50 -0.24 93
IT.GNU.HGE. 2021-08-31T17:56:20.85 0.6 undecidable manual P 264 36.9297 50 0.11 48
IV.SMA1.EHZ. 2021-08-31T17:56:20.24 0.6 positive manual P 132 34.3434 50 -0.11 48
IV.MOMA.HHZ. 2021-08-31T17:56:20.69 0.1 positive manual P 264 36.9297 50 -0.05 97
IV.MC2.EHZ. 2021-08-31T17:56:20.18 0.6 undecidable manual S 59 15.873 122 0.12 49
IV.PF6.EHE. 2021-08-31T17:56:20.39 0.1 undecidable manual P 23 36.1416 50 -0.24 93
IV.RM33.EHZ. 2021-08-31T17:56:20.96 1.0 undecidable manual P 157 39.627 50 -0.21 23
IV.GUMA.HHZ. 2021-08-31T17:56:20.65 1.0 undecidable manual P 45 35.742 50 0.09 24
IT.MTCL.HGZ. 2021-08-31T17:56:20.12 0.3 undecidable manual S 354 17.4714 120 -0.4 70
IV.ARRO.EHZ. 2021-08-31T17:56:20.43 0.3 positive manual P 216 35.4423 50 -0.09 72
IV.MTRA.EHZ. 2021-08-31T17:56:19.85 0.1 negative manual P 106 31.8459 50 -0.11 96
IT.FOPC.HGZ. 2021-08-31T17:56:19.65 1.0 undecidable manual P 300 29.748 50 0.01 25
IV.FEMA.HNZ. 2021-08-31T17:56:19.58 0.6 undecidable manual S 9 14.0748 126 0.06 50
IV.MML1.EHZ. 2021-08-31T17:56:19.67 1.0 positive manual P 353 30.9468 50 -0.15 24
IV.T1299.EHE. 2021-08-31T17:56:19.80 0.1 undecidable manual P 137 30.9468 50 -0.03 98
IV.CSP1.EHZ. 2021-08-31T17:56:19.83 0.1 positive manual P 28 31.9458 50 -0.15 96
IV.MMO1.EHZ. 2021-08-31T17:56:18.87 0.1 positive manual P 74 25.752 50 -0.16 96
IV.LNSS.HHZ. 2021-08-31T17:56:18.97 0.1 undecidable manual P 177 26.0517 50 -0.1 97
IV.CESI.HHZ. 2021-08-31T17:56:18.19 0.3 undecidable manual P 333 20.868 116 0.03 75
IV.FDMO.HHZ. 2021-08-31T17:56:18.42 0.1 positive manual P 14 22.755 114 -0.08 98
IV.NRCA.HNZ. 2021-08-31T17:56:17.84 0.6 undecidable manual S 93 7.5813 143 -0.06 51
IT.MTCL.HGZ. 2021-08-31T17:56:17.51 0.1 undecidable manual P 354 17.4714 120 -0.05 100
IV.GAVE.EHZ. 2021-08-31T17:56:17.97 0.1 positive manual P 213 19.1697 118 0.12 98
IV.FEMA.HNZ. 2021-08-31T17:56:17.15 0.1 undecidable manual P 9 14.0748 126 0.17 98
IV.MC2.EHZ. 2021-08-31T17:56:17.48 0.1 positive manual P 59 15.873 122 0.19 97
IV.NRCA.HNZ. 2021-08-31T17:56:16.21 0.1 undecidable manual P 93 7.5813 143 0.16 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.7 0.00020150000000000002 0.18 AML other m 2021-08-31T17:56:26.96
IV.ARRO.EHN. ML:1.7 0.000201 1.84 AML other m 2021-08-31T17:56:26.01
IV.MOMA.HHN. ML:1.6 0.00013350000000000002 1.1 AML other m 2021-08-31T17:56:27.59
IV.ASSB.HHE. ML:1.6 0.000165 1.22 AML other m 2021-08-31T17:56:27.16
IV.ARRO.EHE. ML:1.6 0.0001715 0.14 AML other m 2021-08-31T17:56:27.23
IV.MOMA.HHE. ML:2.0 0.0003725 0.22 AML other m 2021-08-31T17:56:27.58
IV.ASSB.HHN. ML:1.6 0.0001635 1.24 AML other m 2021-08-31T17:56:27.15
IV.MF5.EHE. ML:1.7 0.0001885 1.04 AML other m 2021-08-31T17:56:28.73
IV.MF5.EHN. ML:1.6 0.0001505 0.3 AML other m 2021-08-31T17:56:28.07
IV.SMA1.EHN. ML:1.7 0.0002185 0.7 AML other m 2021-08-31T17:56:29.17
IV.CESX.HHN. ML:1.7 0.0001525 0.42 AML other m 2021-08-31T17:56:29.70
IV.CESX.HHE. ML:1.6 0.0001285 0.74 AML other m 2021-08-31T17:56:30.22
IV.MGAB.HHN. ML:1.8 0.00009389999999999999 0.24 AML other m 2021-08-31T17:56:41.36
IV.VCEL.EHN. ML:1.8 0.0000864 0.64 AML other m 2021-08-31T17:56:41.47
IV.MGAB.HHE. ML:1.6 0.00005785 0.68 AML other m 2021-08-31T17:56:41.59
IV.VCEL.EHE. ML:1.7 0.00006835 0.46 AML other m 2021-08-31T17:56:43.08
IV.T0110.HHE. ML:1.6 0.00004825 0.4 AML other m 2021-08-31T17:56:43.15
IV.T0110.HHN. ML:1.6 0.0000452 1.08 AML other m 2021-08-31T17:56:48.89
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