Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 24-12-2020 and time 14:31:15 (Italy) in region 6 km W Visso (MC)

A magnitude ML 1.1 earthquake occured in region: 6 km W Visso (MC), on

  • 24-12-2020 13:31:15 (UTC)
  • 24-12-2020 14:31:15 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9430, 13.0200 at 11 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 6 1107 1107
Monte Cavallo MC 6 145 1252
Preci PG 7 724 1976
Sellano PG 10 1079 3055
Ussita MC 10 444 3499
Pieve Torina MC 12 1458 4957
Fiordimonte MC 12 202 5159
Castelsantangelo sul Nera MC 12 281 5440
Pievebovigliana MC 14 866 6306
Fiastra MC 15 559 6865
Serravalle di Chienti MC 15 1070 7935
Muccia MC 16 915 8850
Acquacanina MC 16 121 8971
Cerreto di Spoleto PG 16 1075 10046
Norcia PG 18 4957 15003
Bolognola MC 18 142 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Foligno (57155 inhabitants)
52 Km NE of Terni (111501 inhabitants)
55 Km E of Perugia (166134 inhabitants)
64 Km W of Teramo (54892 inhabitants)
73 Km NW of L'Aquila (69753 inhabitants)
85 Km SW of Ancona (100861 inhabitants)
95 Km NE of Viterbo (67173 inhabitants)
100 Km S of Fano (60888 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 2020-12-24
13:31:15		 42.9428 13.02 11 2020-12-24
13:37:20		 Sala Sismica INGV-Roma 85675911
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-24 13:31:15 ± 0.05
Latitude 42.9428 ± 0.0036
Longitude 13.0200 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85675911

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 408
Semi-minor axis of confidence ellipse (meter) 240
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 209
Circular confidence region, given by single value of horizontal uncertainty (meter) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 143
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.28239
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 85675911
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-24 13:37:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.T0110.HHZ. 2020-12-24T13:31:46.95 3.0 undecidable manual S 0.15 0
IT.NARO.HHZ. 2020-12-24T13:31:32.10 3.0 undecidable manual S 0
IT.NARO.HHZ. 2020-12-24T13:31:29.24 3.0 undecidable manual P 0
IV.ASSB.HHZ. 2020-12-24T13:31:25.94 0.6 undecidable manual S 291 31.3464 50 0 48
IV.MMO1.EHZ. 2020-12-24T13:31:24.13 0.6 undecidable manual S 101 25.3524 50 -0.22 46
IV.CSP1.EHZ. 2020-12-24T13:31:23.66 0.6 undecidable manual S 42 22.2555 50 0.13 47
IV.MC2.EHZ. 2020-12-24T13:31:21.57 0.6 undecidable manual S 104 14.1747 128 0.26 47
IV.ASSB.HHZ. 2020-12-24T13:31:21.27 0.3 negative manual P 291 31.3464 50 -0.09 71
IV.NRCA.HHZ. 2020-12-24T13:31:21.24 0.6 undecidable manual S 148 14.3745 127 -0.12 48
IV.FDMO.HHZ. 2020-12-24T13:31:20.47 0.6 undecidable manual S 28 11.6772 133 -0.19 48
IV.CESI.HHZ. 2020-12-24T13:31:20.67 0.6 undecidable manual S 306 11.5773 133 0.04 49
IV.CSP1.EHZ. 2020-12-24T13:31:20.03 0.1 undecidable manual P 42 22.2555 50 0.07 96
IV.MMO1.EHZ. 2020-12-24T13:31:20.37 0.3 positive manual P 101 25.3524 50 -0.07 72
IT.MTCL.HGZ. 2020-12-24T13:31:19.11 0.6 undecidable manual S 343 5.8941 152 -0.3 47
IV.NRCA.HHZ. 2020-12-24T13:31:18.72 0.3 positive manual P 148 14.3745 127 0.01 74
IV.MC2.EHZ. 2020-12-24T13:31:18.92 1.0 positive manual P 104 14.1747 128 0.24 24
IV.FDMO.HHZ. 2020-12-24T13:31:18.32 0.6 positive manual P 28 11.6772 133 0.01 50
IV.CESI.HHZ. 2020-12-24T13:31:18.45 0.1 negative manual P 306 11.5773 133 0.16 96
IT.MTCL.HGZ. 2020-12-24T13:31:17.60 0.1 undecidable manual P 343 5.8941 152 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:1.0 0.00010180000000000001 0.76 AML other m 2020-12-24T13:31:20.34
IV.FDMO.HHN. ML:1.1 0.000129 0.54 AML other m 2020-12-24T13:31:20.72
IV.CESI.HHE. ML:1.3 0.00023950000000000002 0.18 AML other m 2020-12-24T13:31:20.84
IV.CESI.HHN. ML:1.4 0.000254 0.2 AML other m 2020-12-24T13:31:21.14
IV.NRCA.HHE. ML:1.0 0.0000895 0.94 AML other m 2020-12-24T13:31:21.48
IV.NRCA.HHN. ML:1.1 0.0001085 0.08 AML other m 2020-12-24T13:31:21.61
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