Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 15-09-2020 and time 11:32:00 (UTC) in region 7 km N Courmayeur (AO)

A magnitude ML 1.3 earthquake occured in region: 7 km N Courmayeur (AO), on

  • 15-09-2020 11:32:00 (UTC)
  • 15-09-2020 13:32:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.8520, 6.9810 at 10 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 11 2104 5961
La Salle AO 14 2087 8048
La Thuile AO 15 761 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 1.3 2020-09-15
11:32:00		 45.8525 6.9813 10 2021-02-26
14:55:58		 Bollettino Sismico Italiano INGV 83644901
Reviewed
Rev100 		ML 1.3 2020-09-15
11:32:00		 45.8557 6.9817 10 2020-09-15
11:39:24		 Sala Sismica INGV-Roma 82927241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-15 11:32:00 ± 0.14
Latitude 45.8525 ± 0.0072
Longitude 6.9813 ± 0.0103
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83644901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 856
Semi-minor axis of confidence ellipse (meter) 817
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 244
Circular confidence region, given by single value of horizontal uncertainty (meter) 860.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.84177
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 82927241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-15 11:39:24

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 83644901
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-10-09 12:36:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
MN.BNI.HHZ. 2020-09-15T11:32:27.67 3.0 undecidable manual S -0.16 0
GU.TRAV.HHZ. 2020-09-15T11:32:21.18 0.3 undecidable manual S 122 70.2741 50 -0.41 62
GU.SATI.HHZ. 2020-09-15T11:32:21.46 0.3 undecidable manual S 88 68.5758 50 0.33 63
CH.GIMEL.HHZ. 2020-09-15T11:32:16.42 0.6 undecidable manual P 324 93.4398 50 0.32 40
GU.CIRO.HHZ. 2020-09-15T11:32:16.62 0.3 undecidable manual S 121 53.3022 50 -0.42 63
GU.RSP.HNN. 2020-09-15T11:32:14.40 0.6 undecidable manual P 164 81.1521 50 0.18 42
GU.LSD.HHZ. 2020-09-15T11:32:14.61 0.3 undecidable manual S 165 45.2214 50 -0.27 66
CH.DIX.HHZ. 2020-09-15T11:32:13.18 0.3 undecidable manual S 52 41.4252 50 -0.71 59
GU.SATI.HHZ. 2020-09-15T11:32:12.38 0.6 undecidable manual P 88 68.5758 50 0.11 44
GU.TRAV.HHZ. 2020-09-15T11:32:12.75 0.6 undecidable manual P 122 70.2741 50 0.21 43
GU.CIRO.HHZ. 2020-09-15T11:32:10.21 0.3 undecidable manual P 121 53.3022 50 0.3 65
GU.LSD.HHZ. 2020-09-15T11:32:09.00 0.3 undecidable manual P 165 45.2214 50 0.33 66
CH.DIX.HHZ. 2020-09-15T11:32:08.33 0.3 undecidable manual P 52 41.4252 50 0.23 68
GU.REMY.HHZ. 2020-09-15T11:32:06.03 0.3 undecidable manual S 97 13.6752 127 -0.06 73
IV.MRGE.HHZ. 2020-09-15T11:32:05.40 0.1 undecidable manual S 146 11.0778 133 0 99
IV.MRGE.HHZ. 2020-09-15T11:32:03.52 0.3 undecidable manual P 146 11.0778 133 0.33 70
GU.REMY.HHZ. 2020-09-15T11:32:03.89 0.1 positive manual P 97 13.6752 127 0.3 93
GU.BLANC.HHZ. 2020-09-15T11:32:03.33 0.3 undecidable manual S 256 3.7962 160 -0.63 65
GU.BLANC.HHZ. 2020-09-15T11:32:02.32 0.1 undecidable manual P 256 3.7962 160 -0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHN. ML:1.6 0.0007484999999999999 0.28 AML other m 2020-09-15T11:32:03.34
GU.BLANC.HHE. ML:1.6 0.0006485000000000001 0.44 AML other m 2020-09-15T11:32:03.67
IV.MRGE.HHE. ML:1.4 0.0003075 0.08 AML other m 2020-09-15T11:32:05.56
IV.MRGE.HHN. ML:1.5 0.000356 0.24 AML other m 2020-09-15T11:32:05.53
GU.REMY.HHE. ML:1.0 0.0001123 0.58 AML other m 2020-09-15T11:32:06.09
GU.REMY.HHN. ML:1.2 0.0001505 0.46 AML other m 2020-09-15T11:32:06.16
CH.DIX.HHN. ML:1.2 0.0000484 0.4 AML other m 2020-09-15T11:32:14.39
CH.DIX.HHE. ML:1.2 0.00005715 0.44 AML other m 2020-09-15T11:32:18.66
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