INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 0.9 on date 20-04-2018 and time 16:56:28 (Italy) in region 2 km W Visso (MC)

A magnitude ML 0.9 earthquake occured in region: 2 km W Visso (MC), on

  • 20-04-2018 14:56:28 (UTC)
  • 20-04-2018 16:56:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.94, 13.06 at 9 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 2 1107 1107
Ussita MC 6 444 1551
Preci PG 7 724 2275
Monte Cavallo MC 8 145 2420
Castelsantangelo sul Nera MC 9 281 2701
Fiordimonte MC 11 202 2903
Pieve Torina MC 12 1458 4361
Sellano PG 12 1079 5440
Fiastra MC 14 559 5999
Acquacanina MC 14 121 6120
Pievebovigliana MC 14 866 6986
Bolognola MC 15 142 7128
Muccia MC 16 915 8043
Norcia PG 16 4957 13000
Serravalle di Chienti MC 18 1070 14070
Cerreto di Spoleto PG 18 1075 15145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km E of Foligno (57155 inhabitants)
54 Km NE of Terni (111501 inhabitants)
58 Km E of Perugia (166134 inhabitants)
61 Km NW of Teramo (54892 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
84 Km SW of Ancona (100861 inhabitants)
97 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
Rev 100 ML 0.9 2018-04-20
14:56:28
42.94 13.06 9 2018-04-20
15:02:37
Sala Sismica INGV-Roma 55874751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-04-20 14:56:28 ± 0.08
Latitude 42.94 ± 0.00
Longitude 13.06 ± 0.00
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 55874751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 180
Semi-minor axis of confidence ellipse (meter) 32
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 79
Circular confidence region, given by single value of horizontal uncertainty (meter) 180
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.22213
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 55874751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-04-20 15:02:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
SI.LUSI.HHZ. 2018-04-20T14:58:07.28 3.0 undecidable manual Sg 14.71 0
GU.RORO.HHZ. 2018-04-20T14:58:00.75 3.0 undecidable manual Sn 12.31 0
AC.VLO.HHZ. 2018-04-20T14:57:53.84 3.0 undecidable manual Pg 22.030001 0
RD.PGF.BHZ. 2018-04-20T14:57:43.52 3.0 undecidable manual Sg 20.940001 0
IV.NDIM.HHZ. 2018-04-20T14:57:33.80 3.0 undecidable manual Sn 4.37 0
IV.PLLN.EHZ. 2018-04-20T14:57:28.89 3.0 positive manual Pn 12.8 0
IV.EUCT.HNZ. 2018-04-20T14:57:18.72 3.0 positive manual Pn 12.54 0
IV.SGG.HHZ. 2018-04-20T14:57:06.29 3.0 undecidable manual Sn 0.05 0
IV.LAV9.HNZ. 2018-04-20T14:56:46.97 3.0 undecidable manual Sn -0.83 0
IV.T1214.EHZ. 2018-04-20T14:56:37.10 0.1 undecidable manual S 149 0.2077 111 -0.17 95
IV.PF6.EHZ. 2018-04-20T14:56:37.68 0.1 undecidable manual S 26 0.2221 110 -0.12 95
IV.PP3.EHZ. 2018-04-20T14:56:37.31 3.0 positive manual P -0.26 0
IV.T1220.EHZ. 2018-04-20T14:56:36.14 0.1 undecidable manual S 7 0.1736 115 0.08 97
IV.MMO1.EHZ. 2018-04-20T14:56:36.94 0.1 undecidable manual S 101 0.1979 112 0.03 98
IV.T1221.EHZ. 2018-04-20T14:56:36.00 0.1 undecidable manual S 244 0.1754 114 -0.11 97
IV.CSP1.EHZ. 2018-04-20T14:56:36.40 0.3 undecidable manual S 34 0.1862 113 -0.11 72
IV.COR1.EHZ. 2018-04-20T14:56:36.02 3.0 undecidable manual Pn -1.56 0
IV.CESI.HHZ. 2018-04-20T14:56:34.67 0.1 undecidable manual S 300 0.1331 121 -0.01 99
IV.NRCA.HHZ. 2018-04-20T14:56:34.02 0.1 undecidable manual S 160 0.1106 126 0.06 99
IV.T1219.EHZ. 2018-04-20T14:56:34.31 0.1 undecidable manual S 341 0.125 122 -0.11 97
IV.CSP1.EHZ. 2018-04-20T14:56:33.22 0.1 undecidable manual P 34 0.1862 113 0.01 98
IV.FDMO.HHZ. 2018-04-20T14:56:33.65 0.1 undecidable manual S 11 0.1007 128 0 100
IV.T1214.EHZ. 2018-04-20T14:56:33.51 0.1 undecidable manual P 149 0.2077 111 -0.14 95
IV.PF6.EHZ. 2018-04-20T14:56:33.85 0.1 undecidable manual P 26 0.2221 110 -0.1 96
IV.MMO1.EHZ. 2018-04-20T14:56:33.57 0.1 undecidable manual P 101 0.1979 112 0.13 96
IV.TERO.HHZ. 2018-04-20T14:56:33.82 3.0 undecidable manual Pg 0.61 0
IV.T1219.EHZ. 2018-04-20T14:56:32.02 0.1 undecidable manual P 341 0.125 122 0.02 99
IV.CESI.HHZ. 2018-04-20T14:56:32.28 0.1 undecidable manual P 300 0.1331 121 0.13 97
IV.T1220.EHZ. 2018-04-20T14:56:32.92 0.1 undecidable manual P 7 0.1736 115 -0.03 98
IV.T1221.EHZ. 2018-04-20T14:56:32.99 0.1 undecidable manual P 244 0.1754 114 0.01 98
IV.RM33.EHZ. 2018-04-20T14:56:31.49 3.0 undecidable manual Pn 0.65 0
IV.FDMO.HHZ. 2018-04-20T14:56:31.75 0.1 undecidable manual P 11 0.1007 128 0.19 96
IV.NRCA.HHZ. 2018-04-20T14:56:31.89 0.1 undecidable manual P 160 0.1106 126 0.16 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHN. ML:1.1 3.65E-5 0.54 AML other m 2018-04-20T14:56:33.74
IV.RM33.EHE. ML:1 2.79E-5 0.1 AML other m 2018-04-20T14:56:33.80
IV.FDMO.HHN. ML:0.7 6.105E-5 1.14 AML other m 2018-04-20T14:56:33.92
IV.FDMO.HHE. ML:0.9 0.00011135 0.12 AML other m 2018-04-20T14:56:34.07
IV.NRCA.HHN. ML:1.2 0.0001855 0.14 AML other m 2018-04-20T14:56:34.19
IV.CESI.HHE. ML:0.6 4.475E-5 0.1 AML other m 2018-04-20T14:56:34.81
IV.CESI.HHN. ML:0.8 5.825E-5 1.92 AML other m 2018-04-20T14:56:35.98
IV.NRCA.HHE. ML:1 0.0001041 0.14 AML other m 2018-04-20T14:56:35.60
IV.COR1.HNE. ML:5.4 0.4 0.4 AML other m 2018-04-20T14:57:31.66
IV.COR1.HNN. ML:5.2 0.225 0.4 AML other m 2018-04-20T14:57:31.67
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