Earthquake with magnitude of ML 1.1 on date 17-01-2021 and time 20:25:32 (Italy) in region V3 Monte Bianco (ITALIA, FRANCIA, SVIZZERA)

A magnitude ML 1.1 earthquake occured in region: V3 Monte Bianco (ITALIA, FRANCIA, SVIZZERA), on

  • 17-01-2021 19:25:32 (UTC)
  • 17-01-2021 20:25:32 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.99, 6.94 at 10 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 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
ML 1.1 2021-01-17
45.99 6.94 11 2021-01-17
Sala Sismica INGV-Roma 86335801
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-01-17 19:25:32 ± 0.32
Latitude 45.99 ± 0.01
Longitude 6.94 ± 0.02
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86335801


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1722
Semi-minor axis of confidence ellipse (meter) 901
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 130
Circular confidence region, given by single value of horizontal uncertainty (meter) 1720
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 254
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.14839
Epicentral distance of station farthest from the epicenter (degree) 0.55038
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information


Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 86335801
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-17 19:33:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.LSD.HHZ. 2021-01-17T19:25:51.42 0.6 undecidable manual S 166 0.5504 50 -0.18 48
CH.DIX.HHZ. 2021-01-17T19:25:44.90 0.6 undecidable manual S 75 0.3372 50 -0.38 51
GU.LSD.HHZ. 2021-01-17T19:25:43.96 0.1 undecidable manual P 166 0.5504 50 0.35 99
GU.REMY.HHZ. 2021-01-17T19:25:42.09 0.6 undecidable manual S 136 0.2167 50 0.38 44
IV.MRGE.HHZ. 2021-01-17T19:25:42.33 0.6 undecidable manual S 159 0.2392 50 -0.04 54
GU.BLANC.HHZ. 2021-01-17T19:25:39.18 0.6 undecidable manual S 181 0.1484 122 -0.31 54
CH.DIX.HHZ. 2021-01-17T19:25:39.92 0.6 positive manual P 75 0.3372 50 -0.04 54
IV.MRGE.HHZ. 2021-01-17T19:25:38.28 0.6 negative manual P 159 0.2392 50 0 55
GU.REMY.HHZ. 2021-01-17T19:25:38.17 0.1 negative manual P 136 0.2167 50 0.26 100
GU.BLANC.HHZ. 2021-01-17T19:25:36.49 0.6 positive manual P 181 0.1484 122 -0.13 55
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHN. ML:1.1 0.00011695 0.22 AML other m 2021-01-17T19:25:39.67
GU.BLANC.HHE. ML:1.1 0.0001195 0.26 AML other m 2021-01-17T19:25:39.81
IV.MRGE.HHN. ML:1.2 8.8E-5 0.26 AML other m 2021-01-17T19:25:42.61
IV.MRGE.HHE. ML:1.1 7.735E-5 1.3 AML other m 2021-01-17T19:25:43.70
GU.REMY.HHE. ML:0.8 3.5727175E-5 0.2944 AML other m 2021-01-17T19:25:42.27
GU.REMY.HHN. ML:0.7 3.0199615E-5 0.2304 AML other m 2021-01-17T19:25:42.74
CH.DIX.HHE. ML:1.5 0.000108212375 0.064 AML other m 2021-01-17T19:25:45.33
CH.DIX.HHN. ML:2.1 0.00045199425 0.1664 AML other m 2021-01-17T19:25:45.34
GU.LSD.HHE. ML:1 2.15657945E-5 0.128 AML other m 2021-01-17T19:25:51.58
GU.LSD.HHN. ML:0.7 1.1318636E-5 0.0768 AML other m 2021-01-17T19:25:52.81
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