Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 26-10-2020 and time 04:11:45 (Italy) in region 7 km N Courmayeur (AO)

A magnitude ML 1.4 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) 45.8550, 6.9670 at 9 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

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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 15 2087 8048
La Thuile AO 15 761 8809
Saint-Rhémy-en-Bosses AO 17 338 9147
Saint-Oyen AO 19 203 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
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.4 2020-10-26
03:11:45		 45.8552 6.967 9 2021-02-26
14:56:18		 Bollettino Sismico Italiano INGV 86933711
Reviewed
Rev100 		ML 1.6 2020-10-26
03:11:45		 45.8575 6.9798 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 ± 0.19
Latitude 45.8552 ± 0.0135
Longitude 6.9670 ± 0.0142
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86933711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1555
Semi-minor axis of confidence ellipse (meter) 1086
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 197
Circular confidence region, given by single value of horizontal uncertainty (meter) 1560.0
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 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.02518
Epicentral distance of station farthest from the epicenter (degree) 0.83367
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes 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

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 86933711
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-08 11:24:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CH.GIMEL.HHE. 2020-10-26T03:12:02.48 1.0 undecidable manual P 325 92.5407 50 0.79 17
GU.CIRO.HHZ. 2020-10-26T03:11:55.22 0.3 undecidable manual P 121 54.4011 50 -0.59 61
GU.LSD.HHZ. 2020-10-26T03:11:54.60 0.3 undecidable manual P 164 45.7209 50 0.12 70
CH.DIX.HHZ. 2020-10-26T03:11:53.74 0.3 undecidable manual P 54 42.2244 50 -0.19 69
GU.REMY.HHZ. 2020-10-26T03:11:51.65 0.3 undecidable manual S 97 14.7741 121 -0.09 74
IV.MRGE.HHZ. 2020-10-26T03:11:50.88 0.3 undecidable manual S 143 11.9769 127 -0.05 75
IV.MRGE.HHZ. 2020-10-26T03:11:49.04 0.1 positive manual P 143 11.9769 127 0.3 95
GU.REMY.HHZ. 2020-10-26T03:11:49.50 0.1 undecidable manual P 97 14.7741 121 0.29 95
GU.BLANC.HHZ. 2020-10-26T03:11:48.56 0.3 undecidable manual S 245 2.7972 163 -0.45 70
GU.BLANC.HHZ. 2020-10-26T03:11:47.75 0.1 undecidable manual P 245 2.7972 163 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHN. ML:2.0 0.001681619 0.1008 AML other m 2020-10-26T03:11:48.59
GU.BLANC.HHE. ML:2.0 0.0017914735 0.1808 AML other m 2020-10-26T03:11:48.61
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 0.00014731663000000001 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.HHN. ML:1.0 0.000027738054999999998 0.1392 AML other m 2020-10-26T03:12:00.43
GU.LSD.HHE. ML:1.5 0.00009910952000000001 0.2592 AML other m 2020-10-26T03:12:00.39
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download