Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 17-01-2021 and time 13:42:59 (UTC) in region 4 km W Visso (MC)

A magnitude ML 1.0 earthquake occured in region: 4 km W Visso (MC), on

  • 17-01-2021 13:42:59 (UTC)
  • 17-01-2021 14:42:59 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.93, 13.04 at 2 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
Visso MC 4 1107 1107
Preci PG 6 724 1831
Monte Cavallo MC 8 145 1976
Ussita MC 8 444 2420
Castelsantangelo sul Nera MC 10 281 2701
Sellano PG 10 1079 3780
Fiordimonte MC 12 202 3982
Pieve Torina MC 13 1458 5440
Pievebovigliana MC 15 866 6306
Fiastra MC 15 559 6865
Acquacanina MC 15 121 6986
Norcia PG 16 4957 11943
Cerreto di Spoleto PG 16 1075 13018
Bolognola MC 17 142 13160
Muccia MC 17 915 14075
Serravalle di Chienti MC 17 1070 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km E of Foligno (57155 inhabitants)
52 Km NE of Terni (111501 inhabitants)
56 Km E of Perugia (166134 inhabitants)
62 Km W of Teramo (54892 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
85 Km SW of Ancona (100861 inhabitants)
96 Km NE of Viterbo (67173 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.0 2021-01-17
13:42:59		 42.93 13.04 2 2021-01-17
13:55:43		 Sala Sismica INGV-Roma 86331291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-17 13:42:59 ± 0.11
Latitude 42.93 ± 0.00
Longitude 13.04 ± 0.00
Depth (km) 2 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86331291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 450
Semi-minor axis of confidence ellipse (meter) 155
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 226
Circular confidence region, given by single value of horizontal uncertainty (meter) 450
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 154
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.02968
Epicentral distance of station farthest from the epicenter (degree) 0.31117
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 86331291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-17 13:55:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MF5.EHZ. 2021-01-17T13:43:11.44 0.6 undecidable manual S 80 0.3112 93 0.42 44
IV.GUMA.HHZ. 2021-01-17T13:43:09.10 0.3 undecidable manual S 59 0.2509 94 0.39 67
IV.CSP1.EHZ. 2021-01-17T13:43:06.53 0.3 undecidable manual S 37 0.1988 95 -0.17 71
IV.MMO1.EHZ. 2021-01-17T13:43:06.72 0.6 undecidable manual S 99 0.2113 95 -0.49 44
IV.MF5.EHZ. 2021-01-17T13:43:05.65 1.0 positive manual P 80 0.3112 93 -0.3 23
IV.CESI.HHZ. 2021-01-17T13:43:04.20 0.6 undecidable manual S 306 0.1232 99 0.39 46
IV.GUMA.HHZ. 2021-01-17T13:43:04.66 0.1 undecidable manual P 59 0.2509 94 0.05 97
IV.MC2.EHZ. 2021-01-17T13:43:03.63 0.6 undecidable manual S 101 0.1106 100 0.29 47
IV.MMO1.EHZ. 2021-01-17T13:43:03.44 0.6 undecidable manual P 99 0.2113 95 -0.31 46
IV.FDMO.HHZ. 2021-01-17T13:43:03.21 0.6 undecidable manual S 18 0.1088 100 -0.05 50
IV.NRCA.HHZ. 2021-01-17T13:43:03.71 0.6 undecidable manual S 152 0.1133 99 0.27 47
IV.CSP1.EHZ. 2021-01-17T13:43:03.24 1.0 undecidable manual P 37 0.1988 95 -0.22 24
IV.NRCA.HHZ. 2021-01-17T13:43:01.48 0.1 undecidable manual P 152 0.1133 99 -0.09 98
IV.MC2.EHZ. 2021-01-17T13:43:01.60 0.6 positive manual P 101 0.1106 100 0.09 49
IT.MTCL.HGZ. 2021-01-17T13:43:01.95 0.3 undecidable manual S 333 0.0674 106 0.22 73
IV.CESI.HHZ. 2021-01-17T13:43:01.64 0.6 undecidable manual P 306 0.1232 99 -0.15 49
IV.FDMO.HHZ. 2021-01-17T13:43:01.28 0.6 undecidable manual P 18 0.1088 100 -0.19 48
IV.FEMA.HNZ. 2021-01-17T13:43:00.28 0.3 undecidable manual S 12 0.0297 123 -0.09 75
IT.MTCL.HGZ. 2021-01-17T13:43:00.49 0.1 undecidable manual P 333 0.0674 106 -0.1 99
IV.FEMA.HNZ. 2021-01-17T13:42:59.71 0.1 undecidable manual P 12 0.0297 123 -0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:0.9 0.0001278 0.2 AML other m 2021-01-17T13:43:03.53
IV.NRCA.HHE. ML:1 0.0001505 0.12 AML other m 2021-01-17T13:43:04.19
IV.NRCA.HHN. ML:1.3 0.000262 0.1 AML other m 2021-01-17T13:43:04.27
IV.CESI.HHN. ML:0.8 9.14E-5 0.4 AML other m 2021-01-17T13:43:04.88
IV.FDMO.HHE. ML:0.6 6.465E-5 1.32 AML other m 2021-01-17T13:43:06.08
IV.CESI.HHE. ML:0.8 8.065E-5 1.58 AML other m 2021-01-17T13:43:08.10
IV.CESI.HNE. ML:1 0.000117975555 0.8064 AML other m 2021-01-17T13:43:03.72
IV.CESI.HNN. ML:1.1 0.0001647329 0.6528 AML other m 2021-01-17T13:43:10.16
IV.CSP1.EHE. ML:1 7.552944E-5 0.3648 AML other m 2021-01-17T13:43:07.97
IV.CSP1.EHN. ML:1.2 0.00011257743 0.4224 AML other m 2021-01-17T13:43:08.54
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download