Earthquake with magnitude of ML 0.9 on date 20-09-2020 and time 18:30:50 (UTC) in region 4 km W Visso (MC)

A magnitude ML 0.9 earthquake occured in region: 4 km W Visso (MC), on

  • 20-09-2020 18:30:50 (UTC)
  • 20-09-2020 20:30:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.93, 13.04 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.

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
Sellano PG 10 1079 3499
Castelsantangelo sul Nera MC 10 281 3780
Fiordimonte MC 12 202 3982
Pieve Torina MC 13 1458 5440
Pievebovigliana MC 15 866 6306
Fiastra MC 15 559 6865
Acquacanina MC 16 121 6986
Cerreto di Spoleto PG 16 1075 8061
Norcia PG 16 4957 13018
Muccia MC 17 915 13933
Bolognola MC 17 142 14075
Serravalle di Chienti MC 17 1070 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 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)
86 Km SW of Ancona (100861 inhabitants)
95 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 0.9 2020-09-20
18:30:50
42.93 13.04 11 2020-09-20
18:40:13
Sala Sismica INGV-Roma 83075241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-20 18:30:50 ± 0.04
Latitude 42.93 ± 0.00
Longitude 13.04 ± 0.00
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 83075241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 275
Semi-minor axis of confidence ellipse (meter) 269
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 270
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 62
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 26
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
Epicentral distance of station farthest from the epicenter (degree) 0.36602
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 13
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 83075241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-20 18:40:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.APEC.HHZ. 2020-09-20T18:31:17.66 3.0 undecidable manual S -0.24 0
IV.MOMA.HNN. 2020-09-20T18:31:04.46 0.3 undecidable manual S 250 0.366 50 0.33 66
IV.ASSB.HHZ. 2020-09-20T18:31:02.10 0.3 undecidable manual S 292 0.2986 50 -0.01 72
IV.PF6.EHZ. 2020-09-20T18:31:00.32 0.3 undecidable manual S 29 0.2347 50 0.09 72
IV.GAVE.HNZ. 2020-09-20T18:31:00.80 0.3 undecidable manual S 204 0.2626 50 -0.26 69
IV.CSP1.EHZ. 2020-09-20T18:30:59.25 0.3 undecidable manual S 37 0.2005 50 0.04 73
IV.MMO1.EHZ. 2020-09-20T18:30:59.46 0.6 undecidable manual S 99 0.214 50 -0.16 47
IV.MOMA.HNN. 2020-09-20T18:30:58.53 1.0 undecidable manual P 250 0.366 50 0.04 24
IV.MML1.EHZ. 2020-09-20T18:30:58.55 0.3 undecidable manual S 345 0.1871 50 -0.27 70
IV.GAVE.HNZ. 2020-09-20T18:30:57.01 0.1 undecidable manual P 204 0.2626 50 0.29 91
IV.ASSB.HHZ. 2020-09-20T18:30:57.18 0.1 undecidable manual P 292 0.2986 50 -0.14 93
IV.NRCA.HHZ. 2020-09-20T18:30:56.17 0.3 undecidable manual S 151 0.1142 131 -0.4 69
IV.FDMO.HHZ. 2020-09-20T18:30:56.38 0.3 undecidable manual S 19 0.1097 132 -0.07 74
IV.CESI.HHZ. 2020-09-20T18:30:56.78 0.3 undecidable manual S 306 0.1214 129 -0.01 74
IV.PF6.EHZ. 2020-09-20T18:30:56.17 0.1 undecidable manual P 29 0.2347 50 -0.06 96
IV.MC2.EHZ. 2020-09-20T18:30:56.73 0.3 undecidable manual S 101 0.1124 131 0.19 72
IV.CSP1.EHZ. 2020-09-20T18:30:55.73 0.1 undecidable manual P 37 0.2005 50 0.08 96
IV.MMO1.EHZ. 2020-09-20T18:30:55.85 1.0 undecidable manual P 99 0.214 50 -0.03 24
IV.MML1.EHZ. 2020-09-20T18:30:55.16 0.6 undecidable manual P 345 0.1871 50 -0.26 47
IT.MTCL.HGZ. 2020-09-20T18:30:55.17 0.3 undecidable manual S 335 0.0674 146 -0.19 72
IV.MC2.EHZ. 2020-09-20T18:30:54.27 0.1 undecidable manual P 101 0.1124 131 0.17 96
IV.NRCA.HHZ. 2020-09-20T18:30:54.03 0.1 undecidable manual P 151 0.1142 131 -0.09 98
IV.FEMA.HNZ. 2020-09-20T18:30:54.68 0.3 undecidable manual S 16 0.0306 163 -0.06 75
IV.FDMO.HHZ. 2020-09-20T18:30:54.20 0.1 undecidable manual P 19 0.1097 132 0.15 97
IV.CESI.HHZ. 2020-09-20T18:30:54.36 0.1 undecidable manual P 306 0.1214 129 0.11 97
IT.MTCL.HGZ. 2020-09-20T18:30:53.45 0.1 undecidable manual P 335 0.0674 146 0.03 100
IV.FEMA.HNZ. 2020-09-20T18:30:53.22 0.1 undecidable manual P 16 0.0306 163 0.15 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:0.9 8.7330275E-5 0.0896 AML other m 2020-09-20T18:30:56.32
IV.NRCA.HHN. ML:0.9 8.462372E-5 0.0768 AML other m 2020-09-20T18:30:56.28
IV.NRCA.HHE. ML:0.7 5.6602135E-5 0.0896 AML other m 2020-09-20T18:30:57.09
IV.NRCA.HNE. ML:0.7 5.4492625E-5 0.1152 AML other m 2020-09-20T18:30:57.03
IV.FDMO.HHE. ML:0.8 5.77452E-5 0.128 AML other m 2020-09-20T18:30:57.04
IV.FDMO.HHN. ML:0.8 6.577969E-5 0.2048 AML other m 2020-09-20T18:30:56.55
IV.CESI.HNN. ML:1.3 0.000197445925 0.1152 AML other m 2020-09-20T18:30:57.07
IV.CESI.HNE. ML:1 0.000108186678 0.1024 AML other m 2020-09-20T18:30:56.86
IV.CESI.HHE. ML:1.1 0.00012400665 0.1024 AML other m 2020-09-20T18:30:56.90
IV.CESI.HHN. ML:1.2 0.0001822471 0.1024 AML other m 2020-09-20T18:30:57.07
IV.CSP1.EHN. ML:0.8 3.77431E-5 0.1536 AML other m 2020-09-20T18:31:00.88
IV.CSP1.EHE. ML:0.9 5.7368355E-5 0.256 AML other m 2020-09-20T18:30:59.93
IV.ASSB.HHN. ML:0.6 1.618954E-5 0.1024 AML other m 2020-09-20T18:31:03.31
IV.ASSB.HHE. ML:0.6 1.407764E-5 0.1792 AML other m 2020-09-20T18:31:02.56
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