Earthquake with magnitude of ML 1.4 on date 23-01-2021 and time 18:18:29 (Italy) in region 13 km NW Saint Rhémy en Bosses (AO)

A magnitude ML 1.4 earthquake occured in region: 13 km NW Saint Rhémy en Bosses (AO), on

  • 23-01-2021 17:18:29 (UTC)
  • 23-01-2021 18:18:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.9, 7.06 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
Saint-Rhémy-en-Bosses AO 13 338 338
Courmayeur AO 14 2807 3145
Saint-Oyen AO 14 203 3348
Morgex AO 16 2104 5452
Etroubles AO 16 501 5953
Pré-Saint-Didier AO 16 1050 7003
La Salle AO 17 2087 9090
Allein AO 19 229 9319

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
Reviewed
Rev100
ML 1.4 2021-01-23
17:18:29
45.9 7.06 11 2021-01-23
17:27:11
Sala Sismica INGV-Roma 86503031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-23 17:18:29 ± 0.22
Latitude 45.90 ± 0.01
Longitude 7.06 ± 0.03
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 86503031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1946
Semi-minor axis of confidence ellipse (meter) 1202
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 277
Circular confidence region, given by single value of horizontal uncertainty (meter) 1950
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 175
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.41
Epicentral distance of station closest to the epicenter (degree) 0.10432
Epicentral distance of station farthest from the epicenter (degree) 0.61514
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:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 86503031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-23 17:27:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.LSD.HHE. 2021-01-23T17:18:44.23 0.1 undecidable manual S 173 0.4434 50 -0.38 88
GU.CIRO.HHZ. 2021-01-23T17:18:44.85 0.1 undecidable manual S 130 0.4623 50 -0.33 89
GU.TRAV.HHE. 2021-01-23T17:18:41.53 0.1 undecidable manual P 129 0.6151 50 0.57 81
CH.DIX.HHZ. 2021-01-23T17:18:39.92 0.1 undecidable manual S 53 0.3004 50 -0.47 89
GU.CIRO.HHZ. 2021-01-23T17:18:38.82 0.1 undecidable manual P 130 0.4623 50 0.48 86
GU.LSD.HHE. 2021-01-23T17:18:38.38 0.1 undecidable manual P 173 0.4434 50 0.36 89
CH.DIX.HHZ. 2021-01-23T17:18:35.74 1.0 positive manual P 53 0.3004 50 0.16 24
IV.MRGE.HHZ. 2021-01-23T17:18:35.07 0.1 undecidable manual S 180 0.1304 127 -0.24 97
GU.BLANC.HHZ. 2021-01-23T17:18:34.17 0.3 undecidable manual S 238 0.1043 133 -0.39 71
GU.BLANC.HHZ. 2021-01-23T17:18:32.32 0.1 positive manual P 238 0.1043 133 0.11 100
IV.MRGE.HHZ. 2021-01-23T17:18:32.87 0.1 negative manual P 180 0.1304 127 0.22 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BLANC.HHN. ML:1.2 0.000177 0.76 AML other m 2021-01-23T17:18:34.14
GU.BLANC.HHE. ML:1.4 0.0002755 0.18 AML other m 2021-01-23T17:18:34.46
IV.MRGE.HHN. ML:1.6 0.000366 0.32 AML other m 2021-01-23T17:18:35.37
IV.MRGE.HHE. ML:1.6 0.0003635 0.06 AML other m 2021-01-23T17:18:35.34
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