Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 15-09-2020 and time 16:03:04 (UTC) in region 8 km N Courmayeur (AO)

A magnitude ML 1.0 earthquake occured in region: 8 km N Courmayeur (AO), on

  • 15-09-2020 16:03:04 (UTC)
  • 15-09-2020 18:03:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.8610, 6.9640 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.

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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 8 2807 2807
Pré-Saint-Didier AO 11 1050 3857
Morgex AO 13 2104 5961
La Salle AO 15 2087 8048
La Thuile AO 16 761 8809
Saint-Rhémy-en-Bosses AO 18 338 9147
Saint-Oyen AO 20 203 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 1.0 2020-09-15
16:03:04		 45.8613 6.9637 11 2021-02-26
14:55:58		 Bollettino Sismico Italiano INGV 83753371
Reviewed
Rev100 		ML 1.3 2020-09-15
16:03:04		 45.8577 6.9738 10 2020-09-15
16:10:03		 Sala Sismica INGV-Roma 82932471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-15 16:03:04 ± 0.13
Latitude 45.8613 ± 0.0072
Longitude 6.9637 ± 0.0103
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83753371

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 830
Semi-minor axis of confidence ellipse (meter) 824
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 276
Circular confidence region, given by single value of horizontal uncertainty (meter) 830.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.02698
Epicentral distance of station farthest from the epicenter (degree) 1.21139
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 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 83753371
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-10-13 11:51:25

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 82932471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-15 16:10:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
RD.ORIF.BHE. 2020-09-15T16:03:27.32 0.6 undecidable manual P 219 134.4654 50 0.41 37
GU.CIRO.HHZ. 2020-09-15T16:03:21.52 0.3 undecidable manual S 121 55.0005 50 -0.43 65
CH.GIMEL.HHZ. 2020-09-15T16:03:20.05 0.6 undecidable manual P 325 91.8414 50 -0.29 41
GU.LSD.HHZ. 2020-09-15T16:03:19.38 0.3 undecidable manual S 163 46.5201 50 -0.31 67
CH.DIX.HHZ. 2020-09-15T16:03:18.29 0.3 undecidable manual S 55 42.0246 50 -0.2 69
GU.TRAV.HHZ. 2020-09-15T16:03:17.73 0.3 undecidable manual P 122 71.9724 50 0.44 62
GU.SATI.HHZ. 2020-09-15T16:03:17.17 0.3 undecidable manual P 88 69.8745 50 0.21 66
GU.CIRO.HHZ. 2020-09-15T16:03:14.84 0.3 undecidable manual P 121 55.0005 50 0.18 68
GU.LSD.HHZ. 2020-09-15T16:03:13.49 0.3 undecidable manual P 163 46.5201 50 0.13 70
CH.DIX.HHZ. 2020-09-15T16:03:12.45 0.3 undecidable manual P 55 42.0246 50 -0.21 69
GU.REMY.HHZ. 2020-09-15T16:03:11.04 0.3 undecidable manual S 100 15.1737 125 -0.06 75
IV.MRGE.HHZ. 2020-09-15T16:03:10.17 0.3 undecidable manual S 143 12.6762 130 -0.24 72
IV.MRGE.HHZ. 2020-09-15T16:03:08.31 0.3 positive manual P 143 12.6762 130 0.31 71
GU.REMY.HHZ. 2020-09-15T16:03:08.77 0.1 positive manual P 100 15.1737 125 0.37 94
GU.BLANC.HHE. 2020-09-15T16:03:07.96 0.3 undecidable manual S 231 2.997 164 -0.54 69
GU.BLANC.HHE. 2020-09-15T16:03:07.05 0.1 undecidable manual P 231 2.997 164 0.16 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.REMY.HHE. ML:1.1 0.000117 0.54 AML other m 2020-09-15T16:03:11.31
GU.REMY.HHN. ML:1.2 0.0001475 0.68 AML other m 2020-09-15T16:03:11.44
GU.LSD.HHN. ML:1.0 0.00002825 0.1 AML other m 2020-09-15T16:03:19.43
GU.LSD.HHE. ML:1.3 0.0000533 0.14 AML other m 2020-09-15T16:03:19.43
CH.DIX.HHN. ML:0.9 0.000026663179999999998 1.3824 AML other m 2020-09-15T16:03:18.34
CH.DIX.HHE. ML:1.1 0.000042850239999999994 3.0208 AML other m 2020-09-15T16:03:17.50
GU.CIRO.HHE. ML:0.6 0.0000084558655 1.7408 AML other m 2020-09-15T16:03:22.37
GU.CIRO.HHN. ML:0.9 0.000018630045000000003 0.9088 AML other m 2020-09-15T16:03:22.17
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