Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 31-10-2020 and time 20:33:11 (UTC) in region 4 km SW Preci (PG)

A magnitude ML 1.8 earthquake occured in region: 4 km SW Preci (PG), on

  • 31-10-2020 20:33:11 (UTC)
  • 31-10-2020 21:33:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8540, 12.9980 at 11 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
Sellano PG 7 1079 1803
Cerreto di Spoleto PG 8 1075 2878
Norcia PG 10 4957 7835
Visso MC 11 1107 8942
Castelsantangelo sul Nera MC 14 281 9223
Vallo di Nera PG 14 364 9587
Cascia PG 15 3217 12804
Ussita MC 15 444 13248
Monte Cavallo MC 16 145 13393
Poggiodomo PG 17 117 13510
Campello sul Clitunno PG 18 2442 15952
Sant'Anatolia di Narco PG 19 564 16516

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km E of Foligno (57155 inhabitants)
43 Km NE of Terni (111501 inhabitants)
57 Km SE of Perugia (166134 inhabitants)
62 Km W of Teramo (54892 inhabitants)
65 Km NW of L'Aquila (69753 inhabitants)
88 Km NE of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
97 Km N of Guidonia Montecelio (88673 inhabitants)
100 Km N of Tivoli (56533 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 1.8 2020-10-31
20:33:11		 42.8535 12.9982 11 2021-02-26
14:56:15		 Bollettino Sismico Italiano INGV 86241511
Reviewed
Rev100 		ML 1.8 2020-10-31
20:33:11		 42.8535 12.9943 11 2020-10-31
20:39:42		 Sala Sismica INGV-Roma 84334201
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-31 20:33:11 ± 0.02
Latitude 42.8535 ± 0.0009
Longitude 12.9982 ± 0.0025
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86241511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 151
Semi-minor axis of confidence ellipse (meter) 132
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 92
Circular confidence region, given by single value of horizontal uncertainty (meter) 150.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 37
Number of associated phases, regardless of their use for origin computation 54
Number of defining phases 46
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.53600
Number of stations at which the event was observed 34
Number of stations from which data was used for origin computation 27
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 52
Type of magnitude ML
Reference to an origin 86241511
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-14 09:12:57

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 54
Type of magnitude ML
Reference to an origin 84334201
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-31 20:39:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATVO.HHZ. 2020-10-31T20:33:35.63 3.0 undecidable manual S 0.04 0
IV.ARVD.HHZ. 2020-10-31T20:33:34.40 3.0 undecidable manual S -0.1 0
IV.NARO.HHZ. 2020-10-31T20:33:27.02 3.0 undecidable manual P -0.35 0
IV.ATCC.EHZ. 2020-10-31T20:33:26.96 0.1 undecidable manual S 322 46.9197 50 0.49 85
IV.SNTG.HHZ. 2020-10-31T20:33:26.02 0.3 undecidable manual S 354 44.8218 50 0.11 70
IV.RM33.EHZ. 2020-10-31T20:33:25.34 0.6 undecidable manual S 155 42.1245 50 0.15 46
IV.FRON.EHZ. 2020-10-31T20:33:24.88 3.0 positive manual P -0.23 0
IV.ARVD.HHZ. 2020-10-31T20:33:24.05 3.0 negative manual P -0.21 0
IV.MGAB.HHZ. 2020-10-31T20:33:24.51 3.0 undecidable manual P 0.25 0
IV.ASSB.HHZ. 2020-10-31T20:33:23.08 0.1 undecidable manual S 307 34.6431 50 -0.13 94
IV.ARRO.EHZ. 2020-10-31T20:33:23.58 0.1 undecidable manual S 212 35.8419 50 0.05 96
IV.MOMA.HHZ. 2020-10-31T20:33:23.59 0.3 undecidable manual S 261 35.2425 50 0.22 69
IV.SSFR.HHZ. 2020-10-31T20:33:23.55 3.0 negative manual P 0.09 0
IV.GUMA.HHZ. 2020-10-31T20:33:23.67 0.3 undecidable manual S 50 35.8419 50 0.14 70
IV.ATFO.HHZ. 2020-10-31T20:33:23.51 3.0 negative manual P 0.14 0
IV.MURB.HHZ. 2020-10-31T20:33:22.14 0.3 undecidable manual P 320 59.496 50 0.09 68
IV.CSP1.EHZ. 2020-10-31T20:33:22.31 0.1 undecidable manual S 32 31.3464 50 -0.01 97
IV.EL6.EHZ. 2020-10-31T20:33:21.14 0.3 undecidable manual P 9 53.4021 50 0.01 70
IT.FOPC.HGZ. 2020-10-31T20:33:21.38 0.3 undecidable manual S 298 27.2505 50 0.16 71
IV.MMO1.EHZ. 2020-10-31T20:33:21.06 0.3 undecidable manual S 79 27.1506 50 -0.16 71
IV.LNSS.HHZ. 2020-10-31T20:33:21.29 0.3 undecidable manual S 173 28.0497 50 -0.15 71
IV.MML1.HNZ. 2020-10-31T20:33:21.78 0.3 undecidable manual S 356 28.9488 50 0.1 72
IV.TERO.HHZ. 2020-10-31T20:33:21.49 0.3 undecidable manual P 117 55.5999 50 0.04 69
IV.FOSV.EHZ. 2020-10-31T20:33:20.90 0.6 undecidable manual P 339 52.6029 50 -0.09 46
IV.ATCC.EHZ. 2020-10-31T20:33:20.19 0.1 undecidable manual P 322 46.9197 50 0.07 93
IV.CAMP.HHZ. 2020-10-31T20:33:20.29 0.6 undecidable manual P 136 48.618 50 -0.09 46
IV.GAVE.HNZ. 2020-10-31T20:33:19.18 0.1 undecidable manual S 205 19.7691 118 -0.05 98
IV.RM33.EHZ. 2020-10-31T20:33:19.26 0.3 undecidable manual P 155 42.1245 50 -0.12 70
IV.SNTG.HHZ. 2020-10-31T20:33:19.70 0.3 undecidable manual P 354 44.8218 50 -0.09 70
IV.SAP2.EHZ. 2020-10-31T20:33:19.35 0.6 undecidable manual P 50 42.2244 50 -0.05 47
IV.FDMO.HHZ. 2020-10-31T20:33:19.49 0.3 undecidable manual S 20 21.5673 50 -0.22 71
IV.CESX.HHZ. 2020-10-31T20:33:19.37 0.6 undecidable manual P 231 43.1235 50 -0.17 46
IV.GUMA.HHZ. 2020-10-31T20:33:18.42 0.3 undecidable manual P 50 35.8419 50 0 72
IV.ASSB.HHZ. 2020-10-31T20:33:18.06 0.1 undecidable manual P 307 34.6431 50 -0.17 94
IV.SMA1.EHZ. 2020-10-31T20:33:18.58 0.6 undecidable manual P 132 36.9297 50 0 48
IV.MC2.EHZ. 2020-10-31T20:33:18.54 0.1 undecidable manual S 67 16.7721 123 0.21 96
IV.ARRO.EHZ. 2020-10-31T20:33:18.39 0.1 undecidable manual P 212 35.8419 50 -0.02 96
IV.CESI.HHZ. 2020-10-31T20:33:18.67 0.1 undecidable manual S 336 18.4704 120 -0.15 97
IV.MOMA.HHZ. 2020-10-31T20:33:18.25 0.3 undecidable manual P 261 35.2425 50 -0.07 71
IV.CSP1.EHZ. 2020-10-31T20:33:17.69 0.1 undecidable manual P 32 31.3464 50 -0.03 97
IT.MTCL.HGZ. 2020-10-31T20:33:17.70 0.1 undecidable manual S 0 15.5733 125 -0.28 94
IT.FOPC.HGZ. 2020-10-31T20:33:17.07 0.3 undecidable manual P 298 27.2505 50 -0.01 73
IV.MMO1.EHZ. 2020-10-31T20:33:17.01 0.3 undecidable manual P 79 27.1506 50 -0.07 72
IV.FEMA.HNZ. 2020-10-31T20:33:17.18 0.3 undecidable manual S 19 12.7761 130 -0.02 75
IV.LNSS.HHZ. 2020-10-31T20:33:17.15 0.1 undecidable manual P 173 28.0497 50 -0.06 97
IV.MML1.HNZ. 2020-10-31T20:33:17.17 0.3 undecidable manual P 356 28.9488 50 -0.17 71
IV.NRCA.HNZ. 2020-10-31T20:33:16.50 0.1 undecidable manual S 103 9.6792 138 0.07 100
IV.FDMO.HHZ. 2020-10-31T20:33:16.13 0.1 undecidable manual P 20 21.5673 50 -0.08 97
IV.CESI.HHZ. 2020-10-31T20:33:15.72 0.1 undecidable manual P 336 18.4704 120 0.02 99
IV.GAVE.HNZ. 2020-10-31T20:33:15.98 0.1 undecidable manual P 205 19.7691 118 0.05 98
IT.MTCL.HGZ. 2020-10-31T20:33:15.21 0.1 undecidable manual P 0 15.5733 125 0 100
IV.MC2.EHZ. 2020-10-31T20:33:15.56 0.1 undecidable manual P 67 16.7721 123 0.15 97
IV.FEMA.HNZ. 2020-10-31T20:33:14.92 0.3 undecidable manual P 19 12.7761 130 0.16 73
IV.NRCA.HNZ. 2020-10-31T20:33:14.44 0.1 undecidable manual P 103 9.6792 138 0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:2.2 0.0019199999999999998 0.08 AML other m 2020-10-31T20:33:16.55
IV.NRCA.HHN. ML:2.2 0.002085 0.1 AML other m 2020-10-31T20:33:16.56
IV.NRCA.HNE. ML:2.1 0.001495 0.12 AML other m 2020-10-31T20:33:17.09
IV.NRCA.HHE. ML:2.1 0.0015750000000000002 0.12 AML other m 2020-10-31T20:33:17.03
IV.CESI.HHN. ML:2.5 0.0025499999999999997 0.12 AML other m 2020-10-31T20:33:18.88
IV.CESI.HHE. ML:2.1 0.001054 0.2 AML other m 2020-10-31T20:33:18.86
IV.GAVE.EHN. ML:1.9 0.0006265000000000001 0.58 AML other m 2020-10-31T20:33:19.36
IV.GAVE.EHE. ML:2.0 0.0007749999999999999 0.32 AML other m 2020-10-31T20:33:20.57
IV.LNSS.HHN. ML:2.1 0.000686 0.26 AML other m 2020-10-31T20:33:21.94
IV.LNSS.HHE. ML:2.0 0.000522 0.34 AML other m 2020-10-31T20:33:21.68
IV.CSP1.EHE. ML:2.2 0.000661 0.62 AML other m 2020-10-31T20:33:23.05
IV.ASSB.HHE. ML:2.0 0.000411 0.5 AML other m 2020-10-31T20:33:23.39
IV.ASSB.HHN. ML:1.8 0.00027350000000000003 0.26 AML other m 2020-10-31T20:33:23.44
IV.CSP1.EHN. ML:2.2 0.000689 0.16 AML other m 2020-10-31T20:33:23.58
IV.MOMA.HHN. ML:1.7 0.000189 0.86 AML other m 2020-10-31T20:33:24.49
IV.ARRO.EHN. ML:1.5 0.0001275 0.58 AML other m 2020-10-31T20:33:24.90
IV.MOMA.HHE. ML:1.8 0.00022649999999999998 0.18 AML other m 2020-10-31T20:33:24.66
IV.ARRO.EHE. ML:1.6 0.00013900000000000002 1.14 AML other m 2020-10-31T20:33:24.99
IV.SMA1.EHN. ML:1.8 0.0002665 0.36 AML other m 2020-10-31T20:33:25.21
IV.GUMA.HHN. ML:2.0 0.00041549999999999996 0.44 AML other m 2020-10-31T20:33:25.48
IV.RM33.EHN. ML:1.9 0.00026700000000000004 0.24 AML other m 2020-10-31T20:33:26.23
IV.SNTG.HHN. ML:1.7 0.00015400000000000003 0.14 AML other m 2020-10-31T20:33:26.54
IV.SAP2.EHN. ML:2.6 0.001365 0.14 AML other m 2020-10-31T20:33:26.80
IV.SAP2.EHE. ML:1.9 0.0002645 1.48 AML other m 2020-10-31T20:33:26.82
IV.SNTG.HHE. ML:1.6 0.000132 0.64 AML other m 2020-10-31T20:33:26.60
IV.SMA1.EHE. ML:1.8 0.0002635 1.52 AML other m 2020-10-31T20:33:27.11
IV.ATCC.EHE. ML:2.0 0.00025550000000000003 0.1 AML other m 2020-10-31T20:33:27.17
IV.GUMA.HHE. ML:2.1 0.0005269999999999999 0.34 AML other m 2020-10-31T20:33:27.27
IV.ATCC.EHN. ML:2.0 0.000262 0.28 AML other m 2020-10-31T20:33:27.42
IV.CESX.HHE. ML:1.6 0.000131 0.88 AML other m 2020-10-31T20:33:27.44
IV.CESX.HHN. ML:1.8 0.000194 1.58 AML other m 2020-10-31T20:33:27.90
IV.RM33.EHE. ML:1.8 0.00017999999999999998 0.24 AML other m 2020-10-31T20:33:28.33
IV.FOSV.EHE. ML:1.4 0.000054600000000000006 0.72 AML other m 2020-10-31T20:33:29.59
IV.TERO.HHN. ML:1.6 0.0000887 1.48 AML other m 2020-10-31T20:33:30.02
IV.FOSV.EHN. ML:1.5 0.00007175000000000001 0.44 AML other m 2020-10-31T20:33:30.56
IV.EL6.EHE. ML:2.0 0.00024249999999999999 0.18 AML other m 2020-10-31T20:33:30.70
IV.EL6.EHN. ML:1.9 0.0001835 1.26 AML other m 2020-10-31T20:33:30.26
IV.TERO.HHE. ML:1.4 0.00005665 1.24 AML other m 2020-10-31T20:33:31.96
IV.MURB.HHE. ML:2.1 0.00024249999999999999 1.24 AML other m 2020-10-31T20:33:32.18
IV.ATFO.HHE. ML:1.6 0.00007240000000000001 0.28 AML other m 2020-10-31T20:33:33.26
IV.ATFO.HHN. ML:1.7 0.00008305 1.52 AML other m 2020-10-31T20:33:34.82
IV.MURB.HHN. ML:2.1 0.00028349999999999995 0.26 AML other m 2020-10-31T20:33:34.35
IV.SSFR.HHN. ML:1.8 0.0001105 0.3 AML other m 2020-10-31T20:33:34.60
IV.ARVD.HHN. ML:1.4 0.0000454 1.06 AML other m 2020-10-31T20:33:35.09
IV.ARVD.HHE. ML:1.6 0.00006565 0.6 AML other m 2020-10-31T20:33:35.24
IV.SSFR.HHE. ML:1.9 0.00013700000000000002 0.84 AML other m 2020-10-31T20:33:35.61
IV.FRON.EHE. ML:1.5 0.000043700000000000005 1.52 AML other m 2020-10-31T20:33:36.94
IV.FRON.EHN. ML:1.5 0.000045650000000000005 1.84 AML other m 2020-10-31T20:33:37.05
IV.ATVO.HHN. ML:1.3 0.000027950000000000002 1.48 AML other m 2020-10-31T20:33:37.86
IV.ATVO.HHE. ML:1.3 0.00002955 0.4 AML other m 2020-10-31T20:33:38.69
IV.MGAB.HHN. ML:1.4 0.000044200000000000004 0.38 AML other m 2020-10-31T20:33:38.71
IV.MGAB.HHE. ML:1.4 0.000039599999999999994 0.42 AML other m 2020-10-31T20:33:38.94
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