Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 31-10-2020 and time 21:05:04 (Italy) in region 4 km N Preci (PG)

A magnitude ML 1.1 earthquake occured in region: 4 km N Preci (PG), on

  • 31-10-2020 20:05:04 (UTC)
  • 31-10-2020 21:05:04 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9170, 13.0380 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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 4 724 724
Visso MC 5 1107 1831
Ussita MC 9 444 2275
Monte Cavallo MC 9 145 2420
Sellano PG 9 1079 3499
Castelsantangelo sul Nera MC 10 281 3780
Fiordimonte MC 14 202 3982
Pieve Torina MC 14 1458 5440
Norcia PG 15 4957 10397
Cerreto di Spoleto PG 15 1075 11472
Fiastra MC 17 559 12031
Pievebovigliana MC 17 866 12897
Acquacanina MC 17 121 13018
Bolognola MC 18 142 13160
Muccia MC 19 915 14075
Serravalle di Chienti MC 19 1070 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km E of Foligno (57155 inhabitants)
51 Km NE of Terni (111501 inhabitants)
57 Km E of Perugia (166134 inhabitants)
62 Km W of Teramo (54892 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
87 Km SW of Ancona (100861 inhabitants)
94 Km NE of Viterbo (67173 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
Reviewed
Rev100 		ML 1.1 2020-10-31
20:05:04		 42.917 13.0378 10 2020-10-31
20:20:04		 Sala Sismica INGV-Roma 84333321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-31 20:05:04 ± 0.07
Latitude 42.9170 ± 0.0045
Longitude 13.0378 ± 0.0061
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84333321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 553
Semi-minor axis of confidence ellipse (meter) 401
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 36
Circular confidence region, given by single value of horizontal uncertainty (meter) 550.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 89
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.04587
Epicentral distance of station farthest from the epicenter (degree) 0.41459
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 84333321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-31 20:20:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MF5.EHZ. 2020-10-31T20:05:17.30 0.3 undecidable manual S 77 35.1426 50 0.62 63
IV.ASSB.HHZ. 2020-10-31T20:05:16.00 0.6 undecidable manual S 294 33.744 50 -0.32 46
IV.GAVE.EHZ. 2020-10-31T20:05:14.72 0.3 undecidable manual S 205 27.5502 50 0.07 73
IV.MMO1.EHZ. 2020-10-31T20:05:12.90 0.3 undecidable manual S 95 23.5542 113 -0.57 66
IV.EL6.EHZ. 2020-10-31T20:05:12.96 0.3 undecidable manual P 6 46.0206 50 -0.29 68
IV.ASSB.HHZ. 2020-10-31T20:05:11.09 0.3 undecidable manual P 294 33.744 50 -0.27 70
IV.MF5.EHZ. 2020-10-31T20:05:11.66 0.3 undecidable manual P 77 35.1426 50 0.08 72
IV.CESI.HHZ. 2020-10-31T20:05:10.93 0.3 undecidable manual S 312 14.5743 124 0.21 73
IV.GAVE.EHZ. 2020-10-31T20:05:10.34 0.6 positive manual P 205 27.5502 50 -0.06 49
IV.MC2.EHZ. 2020-10-31T20:05:10.29 0.3 undecidable manual S 93 12.2766 129 0.21 73
IV.FDMO.HHZ. 2020-10-31T20:05:10.28 0.3 undecidable manual S 17 13.875 126 -0.23 73
IT.MTCL.HGZ. 2020-10-31T20:05:09.13 0.3 undecidable manual S 340 9.0798 138 -0.14 75
IV.NRCA.HHZ. 2020-10-31T20:05:09.62 0.3 undecidable manual S 146 11.1777 132 -0.16 74
IV.MMO1.EHZ. 2020-10-31T20:05:09.35 0.3 undecidable manual P 95 23.5542 113 -0.37 69
IV.FDMO.HHZ. 2020-10-31T20:05:08.04 0.6 undecidable manual P 17 13.875 126 0.03 50
IV.CESI.HHZ. 2020-10-31T20:05:08.36 0.3 positive manual P 312 14.5743 124 0.23 72
IV.MC2.EHZ. 2020-10-31T20:05:08.02 0.3 undecidable manual P 93 12.2766 129 0.26 72
IT.MTCL.HGZ. 2020-10-31T20:05:07.41 0.1 undecidable manual P 340 9.0798 138 0.11 100
IV.FEMA.HNZ. 2020-10-31T20:05:07.07 0.1 undecidable manual P 11 5.0949 153 0.24 98
IV.NRCA.HHZ. 2020-10-31T20:05:07.68 0.1 positive manual P 146 11.1777 132 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.4 0.00026900000000000003 0.16 AML other m 2020-10-31T20:05:09.91
IV.NRCA.HHE. ML:1.2 0.00020400000000000003 0.12 AML other m 2020-10-31T20:05:09.87
IV.FDMO.HHE. ML:1.2 0.00014549999999999999 0.18 AML other m 2020-10-31T20:05:10.81
IV.FDMO.HHN. ML:1.1 0.00014050000000000003 0.14 AML other m 2020-10-31T20:05:10.87
IV.CESI.HHN. ML:1.2 0.000153 0.12 AML other m 2020-10-31T20:05:11.19
IV.CESI.HHE. ML:0.9 0.00008435 0.32 AML other m 2020-10-31T20:05:11.19
IV.GAVE.EHN. ML:0.9 0.000042735 0.2 AML other m 2020-10-31T20:05:15.16
IV.GAVE.EHE. ML:1.0 0.00005769999999999999 0.16 AML other m 2020-10-31T20:05:15.44
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