Earthquake with magnitude of ML 0.9 on date 30-12-2020 and time 15:11:43 (Italy) in region 9 km NE Courmayeur (AO)

A magnitude ML 0.9 earthquake occured in region: 9 km NE Courmayeur (AO), on

  • 30-12-2020 14:11:43 (UTC)
  • 30-12-2020 15:11:43 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.862, 7.033 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.

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 11 1050 3857
Morgex AO 12 2104 5961
Saint-Rhémy-en-Bosses AO 12 338 6299
La Salle AO 13 2087 8386
Saint-Oyen AO 15 203 8589
Etroubles AO 16 501 9090
La Thuile AO 17 761 9851
Avise AO 19 305 10156
Saint-Nicolas AO 19 311 10467
Allein AO 19 229 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
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.9 2020-12-30
14:11:43
45.8617 7.0333 11 2020-12-30
14:17:04
Sala Sismica INGV-Roma 85882171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-30 14:11:43 ± 0.22
Latitude 45.8617 ± 0.0099
Longitude 7.0333 ± 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 85882171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1370
Semi-minor axis of confidence ellipse (meter) 1030
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 298
Circular confidence region, given by single value of horizontal uncertainty (meter) 1370
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 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.07105
Epicentral distance of station farthest from the epicenter (degree) 0.60794
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 85882171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-30 14:17:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.CIRO.HHZ. 2020-12-30T14:11:59.06 0.1 undecidable manual S 125 0.4542 50 -0.19 90
GU.LSD.HHZ. 2020-12-30T14:11:57.51 0.1 undecidable manual S 170 0.4083 50 -0.36 88
CH.DIX.HHZ. 2020-12-30T14:11:55.23 0.3 undecidable manual S 50 0.3399 50 -0.61 62
GU.TRAV.HHE. 2020-12-30T14:11:55.75 0.6 undecidable manual P 125 0.6079 50 0.61 39
GU.CIRO.HHZ. 2020-12-30T14:11:53.02 0.3 undecidable manual P 125 0.4542 50 0.51 63
GU.LSD.HHZ. 2020-12-30T14:11:52.18 0.1 undecidable manual P 170 0.4083 50 0.46 86
CH.DIX.HHZ. 2020-12-30T14:11:50.64 0.6 undecidable manual P 50 0.3399 50 0.09 47
IV.MRGE.HHZ. 2020-12-30T14:11:48.20 0.1 undecidable manual S 168 0.0935 137 -0.37 93
GU.REMY.HHZ. 2020-12-30T14:11:48.43 0.1 undecidable manual S 106 0.089 138 -0.01 100
IV.MRGE.HHZ. 2020-12-30T14:11:46.45 0.1 positive manual P 168 0.0935 137 0.1 98
GU.REMY.HHZ. 2020-12-30T14:11:46.59 0.1 undecidable manual P 106 0.089 138 0.32 94
GU.BLANC.HHZ. 2020-12-30T14:11:45.84 0.1 positive manual P 256 0.071 144 -0.19 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHN. ML:0.9 0.00010375 1.92 AML other m 2020-12-30T14:11:45.00
GU.BLANC.HHE. ML:0.8 9.5820855E-5 0.0768 AML other m 2020-12-30T14:11:46.12
IV.MRGE.HHE. ML:1 0.00012835 0.06 AML other m 2020-12-30T14:11:48.40
IV.MRGE.HHN. ML:1.1 0.0001605 0.06 AML other m 2020-12-30T14:11:48.41
GU.REMY.HHN. ML:0.7 6.5886275E-5 0.096 AML other m 2020-12-30T14:11:48.56
GU.REMY.HHE. ML:0.7 6.145E-5 0.64 AML other m 2020-12-30T14:11:48.57
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