Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 15-09-2020 and time 17:59:24 (Italy) in region 7 km N Courmayeur (AO)

A magnitude ML 1.0 earthquake occured in region: 7 km N Courmayeur (AO), on

  • 15-09-2020 15:59:24 (UTC)
  • 15-09-2020 17:59:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.8580, 6.9840 at 11 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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
Etroubles AO 20 501 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
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.0 2020-09-15
15:59:24		 45.8577 6.9838 11 2021-02-26
14:55:58		 Bollettino Sismico Italiano INGV 83752011
Reviewed
Rev100 		ML 1.1 2020-09-15
15:59:24		 45.8462 6.9738 10 2020-09-15
16:11:21		 Sala Sismica INGV-Roma 82932521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-15 15:59:24 ± 0.12
Latitude 45.8577 ± 0.0063
Longitude 6.9838 ± 0.0103
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83752011

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 776
Semi-minor axis of confidence ellipse (meter) 709
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 246
Circular confidence region, given by single value of horizontal uncertainty (meter) 780.0
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 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.03687
Epicentral distance of station farthest from the epicenter (degree) 0.83907
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 83752011
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-10-13 10:15:38

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 11
Type of magnitude ML
Reference to an origin 82932521
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-15 16:11:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.TRAV.HHZ. 2020-09-15T15:59:45.42 0.3 undecidable manual S 123 70.4739 50 -0.22 64
GU.CIRO.HHZ. 2020-09-15T15:59:40.88 0.3 undecidable manual S 122 53.4021 50 -0.21 66
CH.GIMEL.HHZ. 2020-09-15T15:59:40.39 0.6 undecidable manual P 324 93.1401 50 0.29 40
GU.LSD.HHZ. 2020-09-15T15:59:38.89 0.3 undecidable manual S 165 45.7209 50 -0.14 68
GU.RSP.HHE. 2020-09-15T15:59:38.18 0.6 undecidable manual P 164 81.6516 50 -0.16 42
CH.DIX.HHE. 2020-09-15T15:59:37.32 0.3 undecidable manual S 53 41.0256 50 -0.45 64
GU.SATI.HHZ. 2020-09-15T15:59:36.47 1.0 undecidable manual P 88 68.376 50 0.18 22
GU.TRAV.HHZ. 2020-09-15T15:59:36.81 1.0 undecidable manual P 123 70.4739 50 0.2 21
GU.CIRO.HHZ. 2020-09-15T15:59:34.04 0.6 undecidable manual P 122 53.4021 50 0.05 45
GU.LSD.HHZ. 2020-09-15T15:59:33.20 0.3 undecidable manual P 165 45.7209 50 0.41 64
CH.DIX.HHE. 2020-09-15T15:59:32.27 0.3 undecidable manual P 53 41.0256 50 0.2 68
GU.REMY.HHZ. 2020-09-15T15:59:30.20 0.3 undecidable manual S 99 13.4754 128 -0.05 73
IV.MRGE.HHZ. 2020-09-15T15:59:29.61 0.1 undecidable manual S 148 11.3775 133 -0.08 97
GU.REMY.HHZ. 2020-09-15T15:59:28.07 0.1 undecidable manual P 99 13.4754 128 0.35 92
IV.MRGE.HHZ. 2020-09-15T15:59:27.74 0.1 undecidable manual P 148 11.3775 133 0.34 92
GU.BLANC.HHZ. 2020-09-15T15:59:27.58 0.3 undecidable manual S 249 4.0959 159 -0.65 64
GU.BLANC.HHZ. 2020-09-15T15:59:26.57 0.1 undecidable manual P 249 4.0959 159 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MRGE.HHE. ML:1.5 0.0003349424 0.0768 AML other m 2020-09-15T15:59:29.80
IV.MRGE.HHN. ML:1.5 0.00033867144999999996 0.0896 AML other m 2020-09-15T15:59:29.76
GU.REMY.HHE. ML:1.1 0.00011443078000000001 0.2176 AML other m 2020-09-15T15:59:30.32
GU.REMY.HHN. ML:1.1 0.000133788345 0.1152 AML other m 2020-09-15T15:59:30.37
GU.LSD.HHN. ML:0.7 0.000015512125000000002 1.8976 AML other m 2020-09-15T15:59:38.99
GU.LSD.HHE. ML:1.1 0.000035230215 1.872 AML other m 2020-09-15T15:59:39.00
GU.CIRO.HHE. ML:0.6 0.000011146608000000001 0.0896 AML other m 2020-09-15T15:59:41.10
GU.CIRO.HHN. ML:0.8 0.00001385004 0.1152 AML other m 2020-09-15T15:59:41.06
GU.TRAV.HHN. ML:1.0 0.000014960058499999999 0.192 AML other m 2020-09-15T15:59:46.48
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