Earthquake with magnitude of ML 1.6 on date 26-10-2020 and time 04:11:45 (Italy) in region 7 km N Courmayeur (AO)

A magnitude ML 1.6 earthquake occured in region: 7 km N Courmayeur (AO), on

  • 26-10-2020 03:11:45 (UTC)
  • 26-10-2020 04:11:45 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.86, 6.98 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 7 2807 2807
Pré-Saint-Didier AO 10 1050 3857
Morgex AO 12 2104 5961
La Salle AO 14 2087 8048
La Thuile AO 16 761 8809
Saint-Rhémy-en-Bosses AO 16 338 9147
Saint-Oyen AO 18 203 9350

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
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
Reviewed
Rev100
ML 1.6 2020-10-26
03:11:45
45.86 6.98 10 2020-10-26
03:17:46
Sala Sismica INGV-Roma 84138931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-26 03:11:45 ± 0.15
Latitude 45.86 ± 0.01
Longitude 6.98 ± 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 84138931

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1163
Semi-minor axis of confidence ellipse (meter) 968
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 234
Circular confidence region, given by single value of horizontal uncertainty (meter) 1160
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 89
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
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) 0.03417
Epicentral distance of station farthest from the epicenter (degree) 0.83727
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 84138931
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-26 03:17:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.CIRO.HHZ. 2020-10-26T03:12:02.44 0.1 undecidable manual S 122 0.4838 50 -0.16 90
CH.GIMEL.HHE. 2020-10-26T03:12:02.00 0.1 undecidable manual P 324 0.8373 50 0.52 77
GU.LSD.HHZ. 2020-10-26T03:12:00.31 0.6 undecidable manual S 165 0.4119 50 -0.18 45
CH.DIX.HHZ. 2020-10-26T03:11:58.75 0.3 undecidable manual S 53 0.3714 50 -0.53 63
GU.CIRO.HHZ. 2020-10-26T03:11:55.24 0.1 undecidable manual P 122 0.4838 50 -0.19 89
GU.LSD.HHZ. 2020-10-26T03:11:54.38 0.1 undecidable manual P 165 0.4119 50 0.17 91
CH.DIX.HHZ. 2020-10-26T03:11:53.51 0.1 undecidable manual P 53 0.3714 50 0 95
IV.MRGE.HHZ. 2020-10-26T03:11:51.03 0.6 undecidable manual S 147 0.1043 131 0.03 50
GU.REMY.HHZ. 2020-10-26T03:11:51.70 0.6 undecidable manual S 99 0.1241 127 0.1 49
IV.MRGE.HHZ. 2020-10-26T03:11:49.04 0.1 positive manual P 147 0.1043 131 0.31 94
GU.REMY.HHZ. 2020-10-26T03:11:49.52 0.1 positive manual P 99 0.1241 127 0.44 91
GU.BLANC.HHZ. 2020-10-26T03:11:48.56 0.3 undecidable manual S 248 0.0342 159 -0.87 59
GU.BLANC.HHZ. 2020-10-26T03:11:47.77 0.1 negative manual P 248 0.0342 159 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHE. ML:2 0.0017914735 0.1808 AML other m 2020-10-26T03:11:48.61
GU.BLANC.HHN. ML:2 0.001681619 0.1008 AML other m 2020-10-26T03:11:48.59
IV.MRGE.HHE. ML:1.7 0.00057222025 0.0608 AML other m 2020-10-26T03:11:51.07
IV.MRGE.HHN. ML:1.8 0.00077515545 0.0992 AML other m 2020-10-26T03:11:51.08
GU.REMY.HHE. ML:1.2 0.00014731663 0.36 AML other m 2020-10-26T03:11:52.25
GU.REMY.HHN. ML:1.2 0.00016348815 0.3792 AML other m 2020-10-26T03:11:52.81
GU.LSD.HHE. ML:1.5 9.910952E-5 0.2592 AML other m 2020-10-26T03:12:00.39
GU.LSD.HHN. ML:1 2.7738055E-5 0.1392 AML other m 2020-10-26T03:12:00.43
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