Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 21-09-2020 and time 04:56:36 (UTC) in region 5 km N Valgrisenche (AO)

A magnitude ML 1.4 earthquake occured in region: 5 km N Valgrisenche (AO), on

  • 21-09-2020 04:56:36 (UTC)
  • 21-09-2020 06:56:36 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.6720, 7.0800 at 9 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 5 196 196
Rhêmes-Saint-Georges AO 6 194 390
Avise AO 6 305 695
Arvier AO 8 873 1568
La Salle AO 8 2087 3655
Saint-Nicolas AO 9 311 3966
Introd AO 9 658 4624
Morgex AO 10 2104 6728
Villeneuve AO 11 1289 8017
La Thuile AO 11 761 8778
Rhêmes-Notre-Dame AO 12 89 8867
Saint-Pierre AO 12 3165 12032
Pré-Saint-Didier AO 13 1050 13082
Aymavilles AO 13 2086 15168
Valsavarenche AO 13 161 15329
Sarre AO 15 4927 20256
Courmayeur AO 16 2807 23063
Jovençan AO 16 736 23799
Gressan AO 17 3387 27186
Saint-Rhémy-en-Bosses AO 19 338 27524
Charvensod AO 20 2468 29992
Saint-Oyen AO 20 203 30195

Municipalities with at least 50000 inhabitants

An earthquake occurred to
81 Km NW of Torino (890529 inhabitants)
88 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 1.4 2020-09-21
04:56:36		 45.6725 7.0802 9 2021-02-26
14:55:55		 Bollettino Sismico Italiano INGV 83131861
Reviewed
Rev100 		ML 1.4 2020-09-21
04:56:36		 45.672 7.1017 9 2020-09-21
05:02:15		 Sala Sismica INGV-Roma 83089511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-21 04:56:36 ± 0.12
Latitude 45.6725 ± 0.0063
Longitude 7.0802 ± 0.0154
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83131861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1132
Semi-minor axis of confidence ellipse (meter) 638
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 283
Circular confidence region, given by single value of horizontal uncertainty (meter) 1130.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.09803
Epicentral distance of station farthest from the epicenter (degree) 1.13135
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 83131861
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-12-15 13:26:47

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 83089511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-21 05:02:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.RRL.HHE. 2020-09-21T04:57:01.51 0.3 undecidable manual S 195 86.3469 50 -0.83 53
RD.ORIF.BHE. 2020-09-21T04:56:57.71 0.6 undecidable manual P 229 125.5743 50 0.28 39
GU.BHB.HHZ. 2020-09-21T04:56:53.17 0.3 undecidable manual P 171 93.9393 50 0.61 57
GU.TRAV.HHZ. 2020-09-21T04:56:53.56 0.3 undecidable manual S 109 54.7008 50 -0.32 66
CH.DIX.HHZ. 2020-09-21T04:56:52.35 0.3 undecidable manual S 29 51.8037 50 -0.76 58
GU.RRL.HHE. 2020-09-21T04:56:51.59 0.3 undecidable manual P 195 86.3469 50 0.19 64
GU.CIRO.HHZ. 2020-09-21T04:56:48.93 0.3 undecidable manual S 102 38.628 50 -0.67 62
GU.SATI.HHZ. 2020-09-21T04:56:48.49 0.1 undecidable manual P 69 64.9905 50 0.39 86
GU.TRAV.HHZ. 2020-09-21T04:56:47.08 0.3 undecidable manual P 109 54.7008 50 0.57 62
GU.RSP.HHZ. 2020-09-21T04:56:47.47 0.1 undecidable manual P 166 59.8956 50 0.15 91
CH.DIX.HHZ. 2020-09-21T04:56:46.38 0.1 positive manual P 29 51.8037 50 0.31 89
GU.CIRO.HHZ. 2020-09-21T04:56:44.21 0.1 undecidable manual P 102 38.628 50 0.17 94
GU.LSD.HHZ. 2020-09-21T04:56:44.68 0.3 undecidable manual S 170 23.9538 111 -0.71 62
GU.REMY.HHZ. 2020-09-21T04:56:43.76 0.1 undecidable manual S 18 19.2696 116 -0.12 98
GU.BLANC.HHZ. 2020-09-21T04:56:43.94 0.6 undecidable manual S 329 22.1556 113 -0.86 39
IV.MRGE.HHZ. 2020-09-21T04:56:41.23 0.1 undecidable manual S 352 10.878 131 -0.21 98
GU.LSD.HHZ. 2020-09-21T04:56:41.80 0.1 undecidable manual P 170 23.9538 111 0.19 96
GU.REMY.HHZ. 2020-09-21T04:56:41.16 0.1 undecidable manual P 18 19.2696 116 0.42 92
GU.BLANC.HHZ. 2020-09-21T04:56:41.29 0.1 undecidable manual P 329 22.1556 113 0.02 100
IV.MRGE.HHZ. 2020-09-21T04:56:39.50 0.1 undecidable manual P 352 10.878 131 0.17 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MRGE.HHE. ML:1.9 0.0009455 0.48 AML other m 2020-09-21T04:56:41.47
IV.MRGE.HHN. ML:2.0 0.001385 0.06 AML other m 2020-09-21T04:56:41.48
GU.REMY.HHE. ML:1.5 0.00022299999999999997 1.44 AML other m 2020-09-21T04:56:43.89
GU.REMY.HHN. ML:1.5 0.000268 1.76 AML other m 2020-09-21T04:56:43.93
GU.LSD.HHE. ML:1.5 0.000186 0.08 AML other m 2020-09-21T04:56:44.83
GU.LSD.HHN. ML:1.5 0.000187 0.26 AML other m 2020-09-21T04:56:45.31
GU.CIRO.HHE. ML:0.9 0.000029749999999999998 1.32 AML other m 2020-09-21T04:56:49.05
GU.CIRO.HHN. ML:1.3 0.00006870000000000002 0.2 AML other m 2020-09-21T04:56:49.16
CH.DIX.HHE. ML:1.8 0.00013824999999999997 0.82 AML other m 2020-09-21T04:56:52.92
CH.DIX.HHN. ML:1.7 0.000124 0.3 AML other m 2020-09-21T04:56:53.17
GU.TRAV.HHE. ML:1.4 0.000052699999999999993 0.2 AML other m 2020-09-21T04:56:54.22
GU.TRAV.HHN. ML:1.5 0.00007335 0.24 AML other m 2020-09-21T04:56:54.35
GU.RSP.HHN. ML:1.2 0.0000321 1.4 AML other m 2020-09-21T04:56:55.72
GU.RSP.HHE. ML:1.2 0.00002965 0.42 AML other m 2020-09-21T04:56:56.63
GU.SATI.HHN. ML:1.0 0.00001855 0.58 AML other m 2020-09-21T04:56:57.21
GU.SATI.HHE. ML:1.0 0.000019799999999999997 1.9 AML other m 2020-09-21T04:56:59.00
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