Earthquake with magnitude of ML 0.8 on date 20-09-2019 and time 00:40:48 (Italy) in region 10 km NE Courmayeur (AO)

A magnitude ML 0.8 earthquake occured in region: 10 km NE Courmayeur (AO), on

  • 19-09-2019 22:40:48 (UTC)
  • 20-09-2019 00:40:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.88, 7.02 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Courmayeur AO 10 2807 2807
Pré-Saint-Didier AO 13 1050 3857
Morgex AO 13 2104 5961
Saint-Rhémy-en-Bosses AO 14 338 6299
La Salle AO 15 2087 8386
Saint-Oyen AO 16 203 8589
Etroubles AO 18 501 9090
La Thuile AO 18 761 9851

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
Rev 100 ML 0.8 2019-09-19
45.88 7.02 10 2019-09-19
Sala Sismica INGV-Roma 72571911
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2019-09-19 22:40:48 ± 0.2
Latitude 45.88 ± 0.02
Longitude 7.02 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 72571911


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1686
Semi-minor axis of confidence ellipse (meter) 1141
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 182
Circular confidence region, given by single value of horizontal uncertainty (meter) 1690
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 170
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.06925
Epicentral distance of station farthest from the epicenter (degree) 0.42358
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 0.8
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 72571911
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-09-19 22:49:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
CH.DIX.HHE. 2019-09-19T22:41:01.08 0.1 undecidable manual S 53 0.3372 50 -0.4 89
GU.LSD.HHZ. 2019-09-19T22:40:58.04 0.6 negative manual P 169 0.4236 50 0.4 44
CH.DIX.HHE. 2019-09-19T22:40:56.35 0.6 undecidable manual P 53 0.3372 50 0.19 46
GU.REMY.HHZ. 2019-09-19T22:40:54.26 0.1 undecidable manual S 112 0.1007 133 0.05 100
IV.MRGE.HHZ. 2019-09-19T22:40:54.02 0.1 undecidable manual S 166 0.1097 131 -0.43 92
GU.BLANC.HHZ. 2019-09-19T22:40:53.06 0.3 undecidable manual S 243 0.0692 144 -0.31 71
IV.MRGE.HHZ. 2019-09-19T22:40:52.22 0.6 undecidable manual P 166 0.1097 131 0.12 49
GU.REMY.HHZ. 2019-09-19T22:40:52.39 0.1 positive manual P 112 0.1007 133 0.43 92
GU.BLANC.HHZ. 2019-09-19T22:40:51.70 0.1 positive manual P 243 0.0692 144 0.22 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHE. ML:0.7 6.8529495E-5 0.128 AML other m 2019-09-19T22:40:53.48
GU.BLANC.HHN. ML:0.6 5.395605E-5 0.1024 AML other m 2019-09-19T22:40:53.23
IV.MRGE.HHE. ML:0.9 9.396846E-5 0.0896 AML other m 2019-09-19T22:40:54.24
IV.MRGE.HHN. ML:1.1 0.00012393765 0.0768 AML other m 2019-09-19T22:40:54.17
GU.REMY.HHE. ML:0.7 5.617189E-5 0.1792 AML other m 2019-09-19T22:40:54.56
GU.REMY.HHN. ML:0.9 8.538728E-5 0.0768 AML other m 2019-09-19T22:40:54.33
GU.LSD.HHE. ML:0 6.308289E-8 0.32 AML other m 2019-09-19T22:41:01.37
GU.LSD.HHN. ML:0.2 5.01358E-6 0.064 AML other m 2019-09-19T22:41:04.16
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