Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 31-07-2020 and time 05:05:08 (UTC) in region 3 km NE Norcia (PG)

A magnitude ML 1.0 earthquake occured in region: 3 km NE Norcia (PG), on

  • 31-07-2020 05:05:08 (UTC)
  • 31-07-2020 07:05:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8090, 13.1270 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 3 4957 4957
Castelsantangelo sul Nera MC 10 281 5238
Preci PG 11 724 5962
Cascia PG 14 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 17 523 14173
Sellano PG 19 1079 15252
Poggiodomo PG 19 117 15369
Montemonaco AP 19 604 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
69 Km E of Perugia (166134 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
97 Km W of Pescara (121014 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
99 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 2020-07-31
05:05:08		 42.8092 13.127 10 2020-11-19
12:36:59		 Bollettino Sismico Italiano INGV 82558761
Reviewed
Rev100 		ML 1.0 2020-07-31
05:05:08		 42.808 13.1197 9 2020-07-31
05:11:33		 Sala Sismica INGV-Roma 81502161
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-31 05:05:08 ± 0.04
Latitude 42.8092 ± 0.0018
Longitude 13.1270 ± 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 82558761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 221
Semi-minor axis of confidence ellipse (meter) 132
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) 220.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 47
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.55398
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 81502161
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-31 05:11:33

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 82558761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-09-02 09:53:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VAGA.HHZ. 2020-07-31T05:05:37.66 3.0 undecidable manual Pn 0.72 0
IV.RSM2.HHZ. 2020-07-31T05:05:30.05 3.0 undecidable manual P -1.58 0
IV.EL6.EHZ. 2020-07-31T05:05:19.02 0.3 undecidable manual P 358 57.6978 50 0.13 69
IV.CSP1.EHZ. 2020-07-31T05:05:19.48 0.3 undecidable manual S 11 31.9458 50 -0.21 71
IV.FOSV.EHZ. 2020-07-31T05:05:19.40 0.3 undecidable manual P 331 61.494 50 -0.07 70
IV.CESI.HNZ. 2020-07-31T05:05:18.72 0.3 undecidable manual S 320 28.2495 50 0.03 74
IV.SMA1.EHZ. 2020-07-31T05:05:18.03 0.3 undecidable manual S 139 26.0517 111 -0.05 74
IV.LNSS.HHZ. 2020-07-31T05:05:17.23 0.3 undecidable manual S 197 23.9538 112 -0.16 73
IV.MOMA.HNZ. 2020-07-31T05:05:17.29 0.1 undecidable manual P 269 45.3213 50 0.31 91
IV.FDMO.HHZ. 2020-07-31T05:05:17.58 0.3 undecidable manual S 353 25.4523 111 -0.28 71
IV.ASSB.HHN. 2020-07-31T05:05:17.01 0.6 undecidable manual P 304 46.0206 50 -0.07 48
IV.MTRA.EHZ. 2020-07-31T05:05:16.90 0.3 undecidable manual S 105 22.6551 113 -0.09 74
IV.TERO.HHZ. 2020-07-31T05:05:16.64 0.3 undecidable manual P 118 44.0226 50 -0.14 71
IT.MTCL.HGZ. 2020-07-31T05:05:16.75 0.3 undecidable manual S 333 22.9548 113 -0.32 71
IV.GAVE.EHZ. 2020-07-31T05:05:16.96 0.3 undecidable manual S 236 22.9548 113 -0.11 74
IV.MF5.EHZ. 2020-07-31T05:05:15.17 0.6 undecidable manual P 54 33.5442 50 0.01 49
IV.MMO1.EHZ. 2020-07-31T05:05:15.77 0.3 undecidable manual S 58 19.0698 117 -0.08 75
IV.RM33.EHZ. 2020-07-31T05:05:15.18 0.3 undecidable manual P 168 34.0437 50 -0.06 73
IV.ARRO.EHZ. 2020-07-31T05:05:15.98 0.1 undecidable manual P 229 38.9277 50 -0.02 98
IV.FEMA.HNZ. 2020-07-31T05:05:15.50 0.3 undecidable manual S 340 18.0708 118 -0.04 76
IV.MC2.EHZ. 2020-07-31T05:05:14.26 0.3 undecidable manual S 24 12.3765 128 0.37 71
IV.CSP1.EHZ. 2020-07-31T05:05:14.91 0.3 undecidable manual P 11 31.9458 50 -0.01 74
IV.CESI.HNZ. 2020-07-31T05:05:14.34 0.3 undecidable manual P 320 28.2495 50 0 75
IV.SMA1.EHZ. 2020-07-31T05:05:14.10 0.3 undecidable manual P 139 26.0517 111 0.11 74
IT.MTCL.HGZ. 2020-07-31T05:05:13.42 0.3 undecidable manual P 333 22.9548 113 0.01 75
IV.GAVE.EHZ. 2020-07-31T05:05:13.44 0.3 undecidable manual P 236 22.9548 113 0.03 75
IV.LNSS.HHZ. 2020-07-31T05:05:13.66 0.3 undecidable manual P 197 23.9538 112 0.07 74
IV.FDMO.HHZ. 2020-07-31T05:05:13.52 0.6 undecidable manual P 353 25.4523 111 -0.34 47
IV.MTRA.EHZ. 2020-07-31T05:05:13.26 0.3 undecidable manual P 105 22.6551 113 -0.1 74
IV.FEMA.HNZ. 2020-07-31T05:05:12.93 0.3 undecidable manual P 340 18.0708 118 0.4 70
IV.MMO1.EHZ. 2020-07-31T05:05:12.76 0.3 undecidable manual P 58 19.0698 117 0.06 75
IV.MC2.EHZ. 2020-07-31T05:05:11.87 0.3 undecidable manual P 24 12.3765 128 0.3 72
IV.NRCA.HHZ. 2020-07-31T05:05:11.76 0.3 undecidable manual S 339 2.8971 164 -0.19 75
IV.NRCA.HHZ. 2020-07-31T05:05:10.66 0.1 undecidable manual P 339 2.8971 164 0.21 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.2 0.0000948 0.62 AML other m 2020-07-31T05:05:17.20
IV.GAVE.EHE. ML:1.2 0.00010494999999999999 0.16 AML other m 2020-07-31T05:05:17.85
IV.LNSS.HHN. ML:1.3 0.0001315 0.16 AML other m 2020-07-31T05:05:17.94
IV.FDMO.HHN. ML:1.0 0.00005255 0.36 AML other m 2020-07-31T05:05:17.97
IV.SMA1.EHN. ML:0.8 0.000038 1.16 AML other m 2020-07-31T05:05:18.66
IV.FDMO.HHE. ML:0.8 0.00003525 0.92 AML other m 2020-07-31T05:05:18.81
IV.LNSS.HHE. ML:1.3 0.0001225 0.54 AML other m 2020-07-31T05:05:18.16
IV.SMA1.EHE. ML:0.9 0.00004704999999999999 0.36 AML other m 2020-07-31T05:05:19.03
IV.RM33.EHN. ML:0.7 0.00002165 0.94 AML other m 2020-07-31T05:05:20.45
IV.RM33.EHE. ML:0.7 0.00002095 1.02 AML other m 2020-07-31T05:05:23.51
IV.TERO.HHN. ML:1.0 0.000029999999999999997 1.44 AML other m 2020-07-31T05:05:23.78
IV.TERO.HHE. ML:0.9 0.0000235 0.5 AML other m 2020-07-31T05:05:24.48
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