Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 20-01-2021 and time 08:21:43 (Italy) in region Confine Italia Francia (FRANCIA)

A magnitude ML 1.9 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 20-01-2021 07:21:43 (UTC)
  • 20-01-2021 08:21:43 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.5950, 6.9540 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Valgrisenche AO 10 196 196
Rhêmes-Notre-Dame AO 13 89 285
La Thuile AO 14 761 1046
Rhêmes-Saint-Georges AO 17 194 1240
Pré-Saint-Didier AO 19 1050 2290
Morgex AO 19 2104 4394
La Salle AO 19 2087 6481
Avise AO 19 305 6786
Valsavarenche AO 20 161 6947

Municipalities with at least 50000 inhabitants

An earthquake occurred to
81 Km NW of Torino (890529 inhabitants)
87 Km NW of Moncalieri (57294 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
Bulletin
Rev1000 		ML 1.9 2021-01-20
07:21:43		 45.5947 6.9542 10 2021-07-12
16:54:56		 Bollettino Sismico Italiano INGV 86740491
Reviewed
Rev100 		ML 1.9 2021-01-20
07:21:43		 45.5942 6.9318 10 2021-01-20
07:28:24		 Sala Sismica INGV-Roma 86392171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-20 07:21:43 ± 0.15
Latitude 45.5947 ± 0.0045
Longitude 6.9542 ± 0.0129
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86740491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 971
Semi-minor axis of confidence ellipse (meter) 329
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 98
Circular confidence region, given by single value of horizontal uncertainty (meter) 970.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.18436
Epicentral distance of station farthest from the epicenter (degree) 1.40294
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 86740491
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-31 16:55:50

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 86392171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-20 07:28:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.ENR.HHZ. 2021-01-20T07:22:09.06 0.3 undecidable manual P 166 155.7219 50 -0.12 56
GU.RRL.HHZ. 2021-01-20T07:22:06.31 0.3 undecidable manual S 190 75.8685 50 -0.23 65
CH.GIMEL.HHZ. 2021-01-20T07:22:04.06 0.1 undecidable manual P 333 116.8941 50 0.88 65
GU.PZZ.HHZ. 2021-01-20T07:22:04.14 0.3 undecidable manual P 174 121.3896 50 0.26 59
RD.ORIF.BHZ. 2021-01-20T07:22:03.16 0.6 undecidable manual P 229 112.4985 50 0.64 36
CH.DIX.HHZ. 2021-01-20T07:22:03.30 0.6 undecidable manual S 33 64.2912 50 -0.15 45
MN.BNI.HHZ. 2021-01-20T07:22:02.50 0.6 undecidable manual S 200 63.9915 50 -0.87 36
GU.BHB.HHZ. 2021-01-20T07:21:59.07 0.3 undecidable manual P 164 87.6456 50 0.4 61
CH.MMK.HHN. 2021-01-20T07:21:59.67 0.6 undecidable manual P 57 93.0402 50 0.16 42
GU.CIRO.HHZ. 2021-01-20T07:21:58.70 0.3 undecidable manual S 89 47.619 50 -0.32 67
GU.SATI.HHZ. 2021-01-20T07:21:57.45 0.6 undecidable manual P 66 77.367 50 0.36 42
GU.RRL.HHZ. 2021-01-20T07:21:56.77 0.1 undecidable manual P 190 75.8685 50 -0.09 89
GU.TRAV.HHZ. 2021-01-20T07:21:55.43 0.3 undecidable manual P 98 62.1933 50 0.67 59
CH.DIX.HHZ. 2021-01-20T07:21:55.41 0.1 undecidable manual P 33 64.2912 50 0.33 87
GU.REMY.HHZ. 2021-01-20T07:21:54.20 0.3 undecidable manual S 30 31.1466 50 -0.43 68
MN.BNI.HHZ. 2021-01-20T07:21:54.57 0.1 undecidable manual P 200 63.9915 50 -0.46 84
GU.BLANC.HHZ. 2021-01-20T07:21:53.10 0.3 undecidable manual S 357 27.75 50 -0.61 64
GU.CIRO.HHZ. 2021-01-20T07:21:52.88 0.1 undecidable manual P 89 47.619 50 0.36 89
IV.MRGE.HHZ. 2021-01-20T07:21:51.30 0.3 undecidable manual S 23 21.0678 116 -0.46 68
GU.LSD.HHZ. 2021-01-20T07:21:51.20 0.3 undecidable manual S 137 20.4684 116 -0.36 70
GU.REMY.HHZ. 2021-01-20T07:21:50.14 0.1 undecidable manual P 30 31.1466 50 0.16 95
GU.BLANC.HHZ. 2021-01-20T07:21:49.28 0.1 undecidable manual P 357 27.75 50 -0.17 96
IV.MRGE.HHZ. 2021-01-20T07:21:48.34 0.1 positive manual P 23 21.0678 116 0.02 100
GU.LSD.HHZ. 2021-01-20T07:21:48.35 0.3 undecidable manual P 137 20.4684 116 0.14 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.LSD.HHN. ML:2.1 0.0009730000000000001 0.08 AML other m 2021-01-20T07:21:51.33
GU.LSD.HHE. ML:2.2 0.0011099999999999999 0.3 AML other m 2021-01-20T07:21:51.45
IV.MRGE.HHN. ML:2.1 0.0008205 0.72 AML other m 2021-01-20T07:21:52.60
IV.MRGE.HHE. ML:1.9 0.0006295 0.2 AML other m 2021-01-20T07:21:52.41
GU.BLANC.HHE. ML:2.0 0.0005655 0.36 AML other m 2021-01-20T07:21:53.65
GU.BLANC.HHN. ML:1.9 0.0004445 1.48 AML other m 2021-01-20T07:21:54.09
GU.REMY.HHE. ML:1.8 0.000307 1.84 AML other m 2021-01-20T07:21:56.00
GU.REMY.HHN. ML:1.7 0.00023999999999999998 0.3 AML other m 2021-01-20T07:21:56.87
GU.CIRO.HHE. ML:1.4 0.00006840000000000001 1.52 AML other m 2021-01-20T07:21:59.01
GU.CIRO.HHN. ML:1.7 0.0001325 0.86 AML other m 2021-01-20T07:21:59.82
MN.BNI.HHN. ML:1.6 0.00007915 0.12 AML other m 2021-01-20T07:22:02.76
MN.BNI.HHE. ML:1.5 0.000053500000000000006 1.66 AML other m 2021-01-20T07:22:02.83
GU.TRAV.HHE. ML:1.8 0.00013000000000000002 0.74 AML other m 2021-01-20T07:22:03.85
GU.TRAV.HHN. ML:1.9 0.0001445 0.44 AML other m 2021-01-20T07:22:04.44
CH.DIX.HHE. ML:2.2 0.0003345 0.28 AML other m 2021-01-20T07:22:04.43
CH.DIX.HHN. ML:2.2 0.0002655 0.4 AML other m 2021-01-20T07:22:05.28
GU.RRL.HHN. ML:1.8 0.00008575 0.52 AML other m 2021-01-20T07:22:06.32
GU.RRL.HHE. ML:1.8 0.0001008 1.18 AML other m 2021-01-20T07:22:06.33
GU.BHB.HHN. ML:1.9 0.0001001 0.12 AML other m 2021-01-20T07:22:10.11
GU.SATI.HHN. ML:1.5 0.0000524 1.16 AML other m 2021-01-20T07:22:11.31
GU.SATI.HHE. ML:1.5 0.00004910000000000001 0.7 AML other m 2021-01-20T07:22:11.67
GU.BHB.HHE. ML:1.8 0.0000746 1.52 AML other m 2021-01-20T07:22:12.16
GU.PZZ.HHE. ML:2.2 0.0001146 1.76 AML other m 2021-01-20T07:22:21.04
GU.PZZ.HHN. ML:2.1 0.00009065000000000001 0.84 AML other m 2021-01-20T07:22:23.36
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