Earthquake with magnitude of ML 1.2 on date 20-12-2020 and time 22:35:00 (UTC) in region 7 km W Valtournenche (AO)

A magnitude ML 1.2 earthquake occured in region: 7 km W Valtournenche (AO), on

  • 20-12-2020 22:35:00 (UTC)
  • 20-12-2020 23:35:00 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.869, 7.536 at 8 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
Valtournenche AO 7 2277 2277
Chamois AO 7 97 2374
Torgnon AO 8 558 2932
Antey-Saint-André AO 8 602 3534
Bionaz AO 9 236 3770
La Magdeleine AO 9 109 3879
Verrayes AO 12 1302 5181
Oyace AO 12 219 5400
Saint-Denis AO 13 378 5778
Ayas AO 13 1401 7179
Chambave AO 14 931 8110
Châtillon AO 15 4772 12882
Fénis AO 15 1813 14695
Pontey AO 15 817 15512
Nus AO 15 2984 18496
Saint-Vincent AO 16 4660 23156
Saint-Marcel AO 17 1362 24518
Valpelline AO 17 657 25175
Quart AO 17 4039 29214
Ollomont AO 18 157 29371
Doues AO 19 510 29881
Brissogne AO 19 1008 30889
Saint-Christophe AO 19 3432 34321
Brusson AO 20 897 35218
Roisan AO 20 1036 36254

Municipalities with at least 50000 inhabitants

An earthquake occurred to
89 Km N of Torino (890529 inhabitants)
97 Km W of Novara (104380 inhabitants)
97 Km N of Moncalieri (57294 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 1.2 2020-12-20
22:35:00
45.8692 7.5363 8 2020-12-20
22:39:49
Sala Sismica INGV-Roma 85588451
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-20 22:35:00 ± 0.11
Latitude 45.8692 ± 0.0063
Longitude 7.5363 ± 0.0077
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85588451

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 628
Semi-minor axis of confidence ellipse (meter) 418
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 225
Circular confidence region, given by single value of horizontal uncertainty (meter) 630
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.22843
Epicentral distance of station farthest from the epicenter (degree) 0.49643
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 85588451
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-20 22:39:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.LSD.HHZ. 2020-12-20T22:35:17.88 0.6 undecidable manual S 215 0.4964 50 -0.61 42
GU.TRAV.HHZ. 2020-12-20T22:35:14.68 0.3 undecidable manual S 157 0.3858 50 -0.53 67
GU.LSD.HHZ. 2020-12-20T22:35:11.27 0.3 undecidable manual P 215 0.4964 50 0.34 68
GU.CIRO.HHZ. 2020-12-20T22:35:11.14 0.3 undecidable manual S 175 0.268 105 -0.16 74
GU.BLANC.HHE. 2020-12-20T22:35:10.09 0.6 undecidable manual P 267 0.42 50 0.46 45
GU.REMY.HHZ. 2020-12-20T22:35:10.89 0.3 undecidable manual S 263 0.2662 105 -0.34 72
GU.SATI.HHZ. 2020-12-20T22:35:09.65 0.3 undecidable manual S 88 0.2311 107 -0.29 73
CH.DIX.HHZ. 2020-12-20T22:35:09.25 0.3 undecidable manual S 337 0.2284 107 -0.59 67
GU.TRAV.HHZ. 2020-12-20T22:35:09.42 0.6 undecidable manual P 157 0.3858 50 0.38 46
IV.MRGE.HHZ. 2020-12-20T22:35:08.65 0.6 negative manual P 253 0.3453 50 0.29 47
CH.MMK.HHE. 2020-12-20T22:35:08.35 0.1 undecidable manual P 58 0.348 50 -0.05 100
GU.CIRO.HHZ. 2020-12-20T22:35:07.36 1.0 positive manual P 175 0.268 105 0.58 22
GU.REMY.HHZ. 2020-12-20T22:35:07.11 0.3 undecidable manual P 263 0.2662 105 0.37 71
CH.DIX.HHZ. 2020-12-20T22:35:06.09 0.1 positive manual P 337 0.2284 107 0.15 100
GU.SATI.HHZ. 2020-12-20T22:35:06.35 0.1 positive manual P 88 0.2311 107 0.35 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
CH.DIX.HHN. ML:1.4 0.000166 0.42 AML other m 2020-12-20T22:35:09.70
GU.SATI.HHE. ML:0.9 4.38E-5 0.1 AML other m 2020-12-20T22:35:09.80
CH.DIX.HHE. ML:1.4 0.0001525 1.36 AML other m 2020-12-20T22:35:09.23
GU.SATI.HHN. ML:0.8 3.43E-5 0.3 AML other m 2020-12-20T22:35:10.08
GU.TRAV.HHE. ML:1.2 4.96E-5 1.36 AML other m 2020-12-20T22:35:15.81
GU.TRAV.HHN. ML:1.3 6.76E-5 0.1 AML other m 2020-12-20T22:35:15.23
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