Earthquake with magnitude of ML 1.0 on date 23-01-2020 and time 20:50:52 (Italy) in region 11 km NE Courmayeur (AO)

A magnitude ML 1.0 earthquake occured in region: 11 km NE Courmayeur (AO), on

  • 23-01-2020 19:50:52 (UTC)
  • 23-01-2020 20:50:52 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.88, 7.05 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.

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 11 2807 2807
Saint-Rhémy-en-Bosses AO 12 338 3145
Morgex AO 13 2104 5249
Pré-Saint-Didier AO 13 1050 6299
Saint-Oyen AO 14 203 6502
La Salle AO 14 2087 8589
Etroubles AO 16 501 9090
Allein AO 19 229 9319
La Thuile AO 19 761 10080
Avise AO 20 305 10385
Saint-Nicolas AO 20 311 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
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 100 ML 1.0 2020-01-23
19:50:52
45.88 7.05 10 2020-01-23
19:59:13
Sala Sismica INGV-Roma 75777491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-01-23 19:50:52 ± 0.22
Latitude 45.88 ± 0.01
Longitude 7.05 ± 0.03
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 75777491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2117
Semi-minor axis of confidence ellipse (meter) 1316
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 272
Circular confidence region, given by single value of horizontal uncertainty (meter) 2120
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 162
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.43
Epicentral distance of station closest to the epicenter (degree) 0.08544
Epicentral distance of station farthest from the epicenter (degree) 0.41998
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 75777491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-01-23 19:59:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.LSD.HHZ. 2020-01-23T19:51:07.18 0.3 undecidable manual S 172 0.42 50 -0.45 65
CH.DIX.HHE. 2020-01-23T19:51:04.31 0.3 undecidable manual S 51 0.3229 50 -0.45 66
GU.LSD.HHZ. 2020-01-23T19:51:01.76 0.1 undecidable manual P 172 0.42 50 0.53 85
CH.DIX.HHE. 2020-01-23T19:50:59.89 0.3 undecidable manual P 51 0.3229 50 0.32 68
IV.MRGE.HHZ. 2020-01-23T19:50:57.76 0.1 undecidable manual S 175 0.1061 130 -0.07 100
GU.BLANC.HHZ. 2020-01-23T19:50:56.84 0.3 undecidable manual S 249 0.0854 136 -0.39 70
IV.MRGE.HHZ. 2020-01-23T19:50:55.95 1.0 undecidable manual P 175 0.1061 130 0.39 23
GU.BLANC.HHZ. 2020-01-23T19:50:55.42 0.1 undecidable manual P 249 0.0854 136 0.2 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHE. ML:1 0.000133 0.16 AML other m 2020-01-23T19:50:55.55
GU.BLANC.HHN. ML:1 0.0001205 0.08 AML other m 2020-01-23T19:50:55.79
IV.MRGE.HHN. ML:0.9 0.00010205 0.06 AML other m 2020-01-23T19:50:57.88
IV.MRGE.HHE. ML:1 0.0001295 0.12 AML other m 2020-01-23T19:50:57.92
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download