Earthquake with magnitude of ML 1.0 on date 17-10-2021 and time 18:24:49 (Italy) in region Confine Italia Francia (FRANCIA)

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

  • 17-10-2021 16:24:49 (UTC)
  • 17-10-2021 18:24:49 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.825, 6.863 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
Sauze di Cesana TO 13 244 244
Sestriere TO 15 929 1173
Cesana Torinese TO 15 967 2140
Claviere TO 16 214 2354
Prali TO 17 246 2600
Salza di Pinerolo TO 20 75 2675

Municipalities with at least 50000 inhabitants

An earthquake occurred to
68 Km W of Moncalieri (57294 inhabitants)
70 Km W of Torino (890529 inhabitants)
73 Km NW of Cuneo (56081 inhabitants)
Recent and historical seismicity
Seismic hazard
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 1.0 2021-10-17
44.8253 6.8633 9 2021-10-17
Sala Sismica INGV-Roma 96690831
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-10-17 16:24:49 ± 0.19
Latitude 44.8253 ± 0.0072
Longitude 6.8633 ± 0.0139
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 96690831


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1179
Semi-minor axis of confidence ellipse (meter) 358
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 63
Circular confidence region, given by single value of horizontal uncertainty (meter) 1180
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 179
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) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.2617
Epicentral distance of station farthest from the epicenter (degree) 0.6673
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 12
Type of magnitude ML
Reference to an origin 96690831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-17 16:30:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.LSD.HHZ. 2021-10-17T16:25:12.27 0.3 undecidable manual S 17 0.6619 50 -0.13 71
GU.STV.HHZ. 2021-10-17T16:25:12.39 0.3 undecidable manual S 150 0.6673 50 -0.17 70
GU.RSP.HHZ. 2021-10-17T16:25:05.24 0.3 undecidable manual S 41 0.4299 50 -0.28 72
GU.PZZ.HHZ. 2021-10-17T16:25:03.10 0.3 undecidable manual S 151 0.366 50 -0.52 69
GU.STV.HHZ. 2021-10-17T16:25:03.27 0.1 undecidable manual P 150 0.6673 50 0.34 90
GU.LSD.HHZ. 2021-10-17T16:25:03.14 0.1 undecidable manual P 17 0.6619 50 0.3 91
MN.BNI.HHZ. 2021-10-17T16:25:00.09 0.3 undecidable manual S 330 0.2617 107 -0.21 75
GU.BHB.HHZ. 2021-10-17T16:25:00.61 0.3 undecidable manual S 88 0.2833 105 -0.5 71
GU.RSP.HHZ. 2021-10-17T16:24:59.33 0.1 undecidable manual P 41 0.4299 50 0.46 92
GU.PZZ.HHZ. 2021-10-17T16:24:57.86 0.3 undecidable manual P 151 0.366 50 0.08 76
GU.BHB.HHZ. 2021-10-17T16:24:56.83 0.1 positive manual P 88 0.2833 105 0.5 94
MN.BNI.HHZ. 2021-10-17T16:24:55.62 0.1 undecidable manual P 330 0.2617 107 -0.24 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
MN.BNI.HHE. ML:0.6 2.025E-5 0.92 AML other m 2021-10-17T16:25:00.83
MN.BNI.HHN. ML:0.6 1.805E-5 0.32 AML other m 2021-10-17T16:25:01.21
GU.BHB.HHE. ML:0.7 2.535E-5 0.08 AML other m 2021-10-17T16:25:01.70
GU.BHB.HHN. ML:0.7 2.52E-5 0.18 AML other m 2021-10-17T16:25:01.73
GU.PZZ.HHN. ML:1.7 0.000183 0.16 AML other m 2021-10-17T16:25:03.67
GU.PZZ.HHE. ML:1.6 0.0001325 0.5 AML other m 2021-10-17T16:25:04.48
GU.RSP.HHN. ML:1.3 5.465E-5 1.74 AML other m 2021-10-17T16:25:06.08
GU.RSP.HHE. ML:1.2 4.855E-5 0.6 AML other m 2021-10-17T16:25:06.86
GU.LSD.HHE. ML:1.3 2.96E-5 0.18 AML other m 2021-10-17T16:25:13.35
GU.LSD.HHN. ML:0.8 1.1515E-5 1.58 AML other m 2021-10-17T16:25:14.08
GU.STV.HHE. ML:1 1.305E-5 0.5 AML other m 2021-10-17T16:25:14.21
GU.STV.HHN. ML:1 1.255E-5 0.6 AML other m 2021-10-17T16:25:15.62
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download