Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 07-01-2021 and time 11:07:58 (UTC) in region 6 km NE Courmayeur (AO)

A magnitude ML 1.1 earthquake occured in region: 6 km NE Courmayeur (AO), on

  • 07-01-2021 11:07:58 (UTC)
  • 07-01-2021 12:07:58 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.8460, 7.0120 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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 9 1050 3857
Morgex AO 10 2104 5961
La Salle AO 12 2087 8048
Saint-Rhémy-en-Bosses AO 14 338 8386
La Thuile AO 15 761 9147
Saint-Oyen AO 16 203 9350
Etroubles AO 18 501 9851
Avise AO 18 305 10156
Saint-Nicolas AO 19 311 10467
Arvier AO 20 873 11340

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
Reviewed
Rev100 		ML 1.1 2021-01-07
11:07:58		 45.8458 7.0115 10 2021-01-07
11:16:12		 Sala Sismica INGV-Roma 86071791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-07 11:07:58 ± 0.19
Latitude 45.8458 ± 0.0126
Longitude 7.0115 ± 0.0116
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86071791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1393
Semi-minor axis of confidence ellipse (meter) 836
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 2
Circular confidence region, given by single value of horizontal uncertainty (meter) 1390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 185
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.05396
Epicentral distance of station farthest from the epicenter (degree) 0.61154
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 86071791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-07 11:16:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.TRAV.HHZ. 2021-01-07T11:08:19.10 0.6 undecidable manual S 123 67.8765 50 -0.38 42
GU.CIRO.HHZ. 2021-01-07T11:08:14.49 0.6 undecidable manual S 122 50.9157 50 -0.44 43
GU.LSD.HHZ. 2021-01-07T11:08:12.60 0.3 undecidable manual S 167 43.9227 50 -0.46 65
GU.TRAV.HHZ. 2021-01-07T11:08:10.92 0.1 undecidable manual P 123 67.8765 50 0.28 86
GU.CIRO.HHZ. 2021-01-07T11:08:08.08 0.3 undecidable manual P 122 50.9157 50 0.06 70
GU.LSD.HHZ. 2021-01-07T11:08:07.33 0.1 undecidable manual P 167 43.9227 50 0.39 88
IV.MRGE.HHZ. 2021-01-07T11:08:03.30 0.1 undecidable manual S 156 9.2796 136 0.08 100
GU.REMY.HHZ. 2021-01-07T11:08:03.50 0.1 undecidable manual S 94 11.2776 131 -0.22 97
GU.BLANC.HHZ. 2021-01-07T11:08:02.10 0.1 undecidable manual S 269 5.994 148 -0.42 94
GU.REMY.HHZ. 2021-01-07T11:08:01.66 0.1 undecidable manual P 94 11.2776 131 0.12 99
IV.MRGE.HHZ. 2021-01-07T11:08:01.58 0.1 undecidable manual P 156 9.2796 136 0.32 95
GU.BLANC.HHZ. 2021-01-07T11:08:00.97 0.1 undecidable manual P 269 5.994 148 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHE. ML:0.9 0.000141 0.34 AML other m 2021-01-07T11:08:02.69
GU.BLANC.HHN. ML:1.0 0.00016599999999999997 0.4 AML other m 2021-01-07T11:08:02.74
IV.MRGE.HHE. ML:1.2 0.00021600000000000002 0.22 AML other m 2021-01-07T11:08:03.54
IV.MRGE.HHN. ML:1.2 0.00022999999999999998 0.08 AML other m 2021-01-07T11:08:03.50
GU.REMY.HHN. ML:1.2 0.00020150000000000002 0.46 AML other m 2021-01-07T11:08:03.65
GU.REMY.HHE. ML:0.9 0.00009090000000000001 0.64 AML other m 2021-01-07T11:08:03.98
GU.TRAV.HHN. ML:1.1 0.000020850000000000002 0.52 AML other m 2021-01-07T11:08:21.78
GU.TRAV.HHE. ML:1.1 0.00002045 1.64 AML other m 2021-01-07T11:08:38.91
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