Sala Sismica

Earthquake with magnitude of ML 1.0 on date 20-08-2018 and time 06:37:31 (Italy) in region Confine Italia Francia (FRANCIA)

A magnitude ML 1.0 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 20-08-2018 04:37:31 (UTC)
  • 20-08-2018 06:37:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.82, 6.8 at 13 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
Claviere TO 13 214 214
Sauze di Cesana TO 14 244 458
Cesana Torinese TO 14 967 1425
Sestriere TO 16 929 2354

Municipalities with at least 50000 inhabitants

An earthquake occurred to
73 Km W of Moncalieri (57294 inhabitants)
75 Km W of Torino (890529 inhabitants)
76 Km NW of Cuneo (56081 inhabitants)
Recent and historical Seismicity
Seismic hazard
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 ( 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 1.0 2018-08-20
44.82 6.8 13 2018-08-20
Sala Sismica INGV-Roma 59986841
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2018-08-20 04:37:31 ± 0.14
Latitude 44.82 ± 0.01
Longitude 6.80 ± 0.01
Depth (km) 13 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 59986841


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 971
Semi-minor axis of confidence ellipse (meter) 758
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 236
Circular confidence region, given by single value of horizontal uncertainty (meter) 970
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.09623
Epicentral distance of station farthest from the epicenter (degree) 0.6574
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information


Field Value
Value 1
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 59986841
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-08-20 04:45:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
RD.ORIF.BHE. 2018-08-20T04:37:53.24 0.3 undecidable manual S 279 0.6574 92 -0.66 59
GU.RSP.HHZ. 2018-08-20T04:37:48.14 0.3 undecidable manual S 45 0.4623 93 0.04 72
GU.PZZ.HHZ. 2018-08-20T04:37:45.60 0.3 undecidable manual S 145 0.3894 94 -0.35 70
RD.ORIF.BHE. 2018-08-20T04:37:45.18 0.1 undecidable manual P 279 0.6574 92 0.56 81
GU.BHB.HHZ. 2018-08-20T04:37:43.81 0.6 undecidable manual S 88 0.3292 96 -0.37 46
MN.BNI.HHZ. 2018-08-20T04:37:41.20 0.3 undecidable manual S 339 0.2428 99 -0.45 68
GU.RSP.HHZ. 2018-08-20T04:37:41.63 0.1 undecidable manual P 45 0.4623 93 0.36 90
GU.PZZ.HHZ. 2018-08-20T04:37:40.00 0.1 negative manual P 145 0.3894 94 -0.03 98
GU.BHB.HHZ. 2018-08-20T04:37:39.12 0.1 positive manual P 88 0.3292 96 0.11 97
GU.RRL.HHZ. 2018-08-20T04:37:37.48 0.3 undecidable manual S 356 0.0962 130 -0.15 74
MN.BNI.HHZ. 2018-08-20T04:37:37.75 0.6 negative manual P 339 0.2428 99 0.2 49
GU.RRL.HHZ. 2018-08-20T04:37:35.44 0.1 undecidable manual P 356 0.0962 130 0.22 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
MN.BNI.HHE. ML:0.8 3.38E-5 0.22 AML other m 2018-08-20T04:37:41.39
MN.BNI.HHN. ML:0.7 2.25E-5 1.16 AML other m 2018-08-20T04:37:42.91
GU.BHB.HHN. ML:1 3.72E-5 0.1 AML other m 2018-08-20T04:37:44.56
GU.BHB.HHE. ML:0.8 2.705E-5 0.14 AML other m 2018-08-20T04:37:44.67
GU.PZZ.HHN. ML:1.4 8.27E-5 0.78 AML other m 2018-08-20T04:37:46.11
GU.PZZ.HHE. ML:1.4 8.165E-5 0.8 AML other m 2018-08-20T04:37:46.21
GU.RSP.HHN. ML:1 2.43E-5 0.12 AML other m 2018-08-20T04:37:48.43
GU.RSP.HHE. ML:1 2.385E-5 0.84 AML other m 2018-08-20T04:37:49.23
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download