Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 04-09-2020 and time 21:30:59 (Italy) in region 7 km NE Courmayeur (AO)

A magnitude ML 0.8 earthquake occured in region: 7 km NE Courmayeur (AO), on

  • 04-09-2020 19:30:59 (UTC)
  • 04-09-2020 21:30:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.8510, 7.0020 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 13 2087 8048
Saint-Rhémy-en-Bosses AO 14 338 8386
La Thuile AO 15 761 9147
Saint-Oyen AO 17 203 9350
Etroubles AO 18 501 9851
Avise AO 19 305 10156
Saint-Nicolas AO 20 311 10467

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 0.8 2020-09-04
19:30:59		 45.8508 7.0022 10 2021-02-26
14:56:07		 Bollettino Sismico Italiano INGV 84964001
Reviewed
Rev100 		ML 0.5 2020-09-04
19:31:00		 45.8098 7.005 7 2020-09-04
19:42:27		 Sala Sismica INGV-Roma 82625411
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-04 19:30:59 ± 0.21
Latitude 45.8508 ± 0.0117
Longitude 7.0022 ± 0.0168
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 84964001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1310
Semi-minor axis of confidence ellipse (meter) 1255
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 305
Circular confidence region, given by single value of horizontal uncertainty (meter) 1310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 149
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.04766
Epicentral distance of station farthest from the epicenter (degree) 0.72575
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:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 7
Type of magnitude ML
Reference to an origin 84964001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-23 11:10:23

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 3
Type of magnitude ML
Reference to an origin 82625411
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-04 19:42:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.RSP.HHE. 2020-09-04T19:31:23.59 0.6 undecidable manual S 165 80.5638 50 -0.11 43
GU.CIRO.HHE. 2020-09-04T19:31:15.25 0.6 undecidable manual S 122 51.8037 50 -0.77 38
GU.RSP.HHE. 2020-09-04T19:31:14.16 0.3 undecidable manual P 165 80.5638 50 0.72 54
GU.LSD.HHZ. 2020-09-04T19:31:13.40 0.6 undecidable manual S 167 44.622 50 -0.7 39
CH.DIX.HHZ. 2020-09-04T19:31:11.76 0.6 undecidable manual S 51 40.3263 50 -1.2 31
GU.CIRO.HHE. 2020-09-04T19:31:09.35 0.3 undecidable manual P 122 51.8037 50 0.35 65
GU.LSD.HHZ. 2020-09-04T19:31:08.09 0.3 undecidable manual P 167 44.622 50 0.2 68
CH.DIX.HHZ. 2020-09-04T19:31:07.78 0.3 undecidable manual P 51 40.3263 50 0.55 63
IV.MRGE.HHZ. 2020-09-04T19:31:04.14 0.3 undecidable manual S 153 10.0788 134 -0.1 74
GU.REMY.HHZ. 2020-09-04T19:31:04.64 0.6 undecidable manual S 97 11.9769 129 -0.1 49
GU.REMY.HHZ. 2020-09-04T19:31:02.71 0.1 undecidable manual P 97 11.9769 129 0.22 95
GU.BLANC.HHZ. 2020-09-04T19:31:02.80 0.3 undecidable manual S 262 5.2947 151 -0.42 69
IV.MRGE.HHZ. 2020-09-04T19:31:02.34 0.1 undecidable manual P 153 10.0788 134 0.15 97
GU.BLANC.HHZ. 2020-09-04T19:31:01.56 0.1 undecidable manual P 262 5.2947 151 -0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHN. ML:1.0 0.00018592815000000002 0.0768 AML other m 2020-09-04T19:31:01.72
GU.BLANC.HHE. ML:1.0 0.0001716356 0.0768 AML other m 2020-09-04T19:31:01.69
IV.MRGE.HHN. ML:0.6 0.000056975335 0.0896 AML other m 2020-09-04T19:31:02.53
IV.MRGE.HHE. ML:1.0 0.00014513535 0.1792 AML other m 2020-09-04T19:31:04.28
GU.REMY.HHE. ML:0.6 0.000049966684999999996 0.1024 AML other m 2020-09-04T19:31:04.76
GU.REMY.HHN. ML:0.6 0.000050444694999999995 0.4224 AML other m 2020-09-04T19:31:06.52
GU.LSD.HHN. ML:0.2 0.000004597585499999999 0.064 AML other m 2020-09-04T19:31:14.18
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