Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 30-12-2020 and time 16:24:41 (UTC) in region 9 km NE Courmayeur (AO)

A magnitude ML 1.3 earthquake occured in region: 9 km NE Courmayeur (AO), on

  • 30-12-2020 16:24:41 (UTC)
  • 30-12-2020 17:24:41 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.8620, 7.0370 at 11 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 9 2807 2807
Pré-Saint-Didier AO 12 1050 3857
Morgex AO 12 2104 5961
Saint-Rhémy-en-Bosses AO 12 338 6299
La Salle AO 13 2087 8386
Saint-Oyen AO 14 203 8589
Etroubles AO 16 501 9090
La Thuile AO 17 761 9851
Avise AO 19 305 10156
Allein AO 19 229 10385
Saint-Nicolas AO 19 311 10696

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 1.3 2020-12-30
16:24:41		 45.8625 7.0372 11 2020-12-30
16:30:50		 Sala Sismica INGV-Roma 85883671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-30 16:24:41 ± 0.22
Latitude 45.8625 ± 0.0099
Longitude 7.0372 ± 0.0168
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85883671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1412
Semi-minor axis of confidence ellipse (meter) 980
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 296
Circular confidence region, given by single value of horizontal uncertainty (meter) 1410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 154
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) 0.07374
Epicentral distance of station farthest from the epicenter (degree) 0.60614
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 85883671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-30 16:30:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.SATI.HHZ. 2020-12-30T16:25:00.28 0.1 undecidable manual S 88 64.1913 50 -0.37 84
GU.CIRO.HHZ. 2020-12-30T16:24:56.76 0.1 undecidable manual S 125 50.2164 50 -0.16 90
GU.LSD.HHZ. 2020-12-30T16:24:55.18 0.1 undecidable manual S 170 45.3213 50 -0.43 86
GU.TRAV.HHZ. 2020-12-30T16:24:53.46 0.1 undecidable manual P 125 67.2771 50 0.62 78
GU.SATI.HHZ. 2020-12-30T16:24:52.83 0.3 undecidable manual P 88 64.1913 50 0.47 62
CH.DIX.HHZ. 2020-12-30T16:24:52.90 0.1 undecidable manual S 50 37.4292 50 -0.6 83
GU.CIRO.HHZ. 2020-12-30T16:24:50.73 0.1 undecidable manual P 125 50.2164 50 0.52 83
GU.LSD.HHZ. 2020-12-30T16:24:49.86 0.3 negative manual P 170 45.3213 50 0.41 65
CH.DIX.HHZ. 2020-12-30T16:24:48.37 0.1 undecidable manual P 50 37.4292 50 0.14 93
GU.REMY.HHZ. 2020-12-30T16:24:46.11 0.1 undecidable manual S 107 9.5793 139 -0.01 100
IV.MRGE.HHZ. 2020-12-30T16:24:45.93 0.1 undecidable manual S 170 10.4784 137 -0.39 92
IV.MRGE.HHZ. 2020-12-30T16:24:44.12 0.1 undecidable manual P 170 10.4784 137 0.04 99
GU.REMY.HHZ. 2020-12-30T16:24:44.27 0.1 undecidable manual P 107 9.5793 139 0.3 94
GU.BLANC.HHZ. 2020-12-30T16:24:43.54 0.1 undecidable manual P 256 8.1807 143 -0.26 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHN. ML:1.4 0.0003635 0.08 AML other m 2020-12-30T16:24:43.70
GU.BLANC.HHE. ML:1.5 0.00041299999999999996 0.22 AML other m 2020-12-30T16:24:43.82
IV.MRGE.HHE. ML:1.6 0.00047599999999999997 1.8 AML other m 2020-12-30T16:24:45.09
IV.MRGE.HHN. ML:1.7 0.0006135 0.08 AML other m 2020-12-30T16:24:46.06
GU.REMY.HHN. ML:1.4 0.00031633379500000004 0.1024 AML other m 2020-12-30T16:24:46.24
GU.REMY.HHE. ML:1.4 0.00027049999999999996 0.66 AML other m 2020-12-30T16:24:46.24
CH.DIX.HHE. ML:1.6 0.00012871343 0.1792 AML other m 2020-12-30T16:24:53.49
CH.DIX.HHN. ML:1.3 0.00007191307999999999 0.1408 AML other m 2020-12-30T16:24:53.20
GU.LSD.HHE. ML:0.9 0.00002446481 0.0896 AML other m 2020-12-30T16:24:55.29
GU.LSD.HHN. ML:0.8 0.00001780738 0.1664 AML other m 2020-12-30T16:24:56.86
GU.CIRO.HHN. ML:0.9 0.000019936545 0.1664 AML other m 2020-12-30T16:24:57.06
GU.TRAV.HHN. ML:1.2 0.000023316885000000003 0.0768 AML other m 2020-12-30T16:25:05.24
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