Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 18-02-2021 and time 05:10:04 (Italy) in region 5 km W Avise (AO)

A magnitude ML 1.8 earthquake occured in region: 5 km W Avise (AO), on

  • 18-02-2021 04:10:04 (UTC)
  • 18-02-2021 05:10:04 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.6980, 7.0790 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
Avise AO 5 305 305
La Salle AO 6 2087 2392
Arvier AO 7 873 3265
Saint-Nicolas AO 7 311 3576
Morgex AO 7 2104 5680
Valgrisenche AO 8 196 5876
Rhêmes-Saint-Georges AO 8 194 6070
Introd AO 9 658 6728
Villeneuve AO 10 1289 8017
Pré-Saint-Didier AO 10 1050 9067
La Thuile AO 10 761 9828
Saint-Pierre AO 12 3165 12993
Aymavilles AO 13 2086 15079
Courmayeur AO 13 2807 17886
Sarre AO 14 4927 22813
Rhêmes-Notre-Dame AO 15 89 22902
Jovençan AO 15 736 23638
Valsavarenche AO 16 161 23799
Saint-Rhémy-en-Bosses AO 16 338 24137
Gressan AO 17 3387 27524
Saint-Oyen AO 18 203 27727
Etroubles AO 18 501 28228
Gignod AO 19 1710 29938
Aosta AO 19 34390 64328
Charvensod AO 19 2468 66796
Allein AO 20 229 67025

Municipalities with at least 50000 inhabitants

An earthquake occurred to
84 Km NW of Torino (890529 inhabitants)
91 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 1.8 2021-02-18
04:10:04		 45.6985 7.0793 9 2021-07-12
16:55:01		 Bollettino Sismico Italiano INGV 87942291
Reviewed
Rev100 		ML 2.0 2021-02-18
04:10:04		 45.6953 7.0828 9 2021-02-18
04:43:09		 Sala Sismica INGV-Roma 87265731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-18 04:10:04 ± 0.13
Latitude 45.6985 ± 0.0081
Longitude 7.0793 ± 0.0142
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 87942291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1110
Semi-minor axis of confidence ellipse (meter) 792
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 314
Circular confidence region, given by single value of horizontal uncertainty (meter) 1110.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.87234
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:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 14
Type of magnitude ML
Reference to an origin 87942291
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-09 11:27:14

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 87265731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-18 04:43:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
RD.ORIF.BHZ. 2021-02-18T04:10:41.11 0.6 undecidable manual S 0.09 39
GU.BHB.HHZ. 2021-02-18T04:10:32.67 0.3 undecidable manual S 171 96.8253 50 -0.1 63
GU.RRL.HHE. 2021-02-18T04:10:30.18 0.6 undecidable manual S 195 89.1441 50 -0.55 38
CH.MMK.HHN. 2021-02-18T04:10:27.31 0.3 undecidable manual S 60 78.6657 50 -0.63 57
MN.BNI.HHZ. 2021-02-18T04:10:26.48 0.3 undecidable manual S 204 78.2661 50 -1.34 41
RD.ORIF.BHZ. 2021-02-18T04:10:25.92 1.0 positive manual P 0.51 18
CH.GIMEL.HHE. 2021-02-18T04:10:24.09 0.1 undecidable manual P 1.02 60
GU.TRAV.HHE. 2021-02-18T04:10:22.03 0.3 undecidable manual S 112 55.6998 50 0.23 66
GU.RSP.HHE. 2021-02-18T04:10:22.99 0.6 undecidable manual S 167 62.6928 50 -0.69 38
GU.BHB.HHZ. 2021-02-18T04:10:21.26 0.1 undecidable manual P 171 96.8253 50 0.62 73
GU.RRL.HHE. 2021-02-18T04:10:19.71 0.1 undecidable manual P 195 89.1441 50 0.25 82
CH.DIX.HHN. 2021-02-18T04:10:19.52 0.6 undecidable manual S 31 49.3173 50 -0.59 41
CH.MMK.HHN. 2021-02-18T04:10:18.05 0.1 undecidable manual P 60 78.6657 50 0.2 85
MN.BNI.HHZ. 2021-02-18T04:10:17.74 0.1 undecidable manual P 204 78.2661 50 -0.04 88
GU.CIRO.HHZ. 2021-02-18T04:10:16.94 0.3 undecidable manual S 106 39.4272 50 -0.5 64
GU.RSP.HHE. 2021-02-18T04:10:15.54 0.1 positive manual P 167 62.6928 50 0.15 88
GU.TRAV.HHE. 2021-02-18T04:10:14.74 0.1 positive manual P 112 55.6998 50 0.43 84
CH.DIX.HHN. 2021-02-18T04:10:13.47 0.1 undecidable manual P 31 49.3173 50 0.14 91
GU.CIRO.HHZ. 2021-02-18T04:10:11.97 0.1 positive manual P 106 39.4272 50 0.18 92
GU.BLANC.HHN. 2021-02-18T04:10:10.95 0.6 undecidable manual S 325 19.6692 115 -0.67 42
IV.MRGE.HHZ. 2021-02-18T04:10:08.11 0.1 undecidable manual S 350 7.9809 139 -0.2 96
GU.BLANC.HHN. 2021-02-18T04:10:08.32 0.1 positive manual P 325 19.6692 115 -0.1 96
IV.MRGE.HHZ. 2021-02-18T04:10:06.53 0.1 positive manual P 350 7.9809 139 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MRGE.HHE. ML:2.4 0.003485 0.16 AML other m 2021-02-18T04:10:08.23
IV.MRGE.HHN. ML:2.5 0.004455 0.16 AML other m 2021-02-18T04:10:08.43
GU.BLANC.HHN. ML:1.8 0.0005355000000000001 1.32 AML other m 2021-02-18T04:10:11.87
GU.BLANC.HHE. ML:1.9 0.00059 0.74 AML other m 2021-02-18T04:10:11.98
GU.CIRO.HHN. ML:1.5 0.0001152 1.3 AML other m 2021-02-18T04:10:16.98
GU.CIRO.HHE. ML:1.4 0.0001013 1.04 AML other m 2021-02-18T04:10:17.30
CH.DIX.HHN. ML:2.3 0.0005885 0.14 AML other m 2021-02-18T04:10:20.31
CH.DIX.HHE. ML:2.4 0.000708 0.14 AML other m 2021-02-18T04:10:20.31
GU.BHB.HHN. ML:1.9 0.00007815 0.9 AML other m 2021-02-18T04:10:34.54
GU.BHB.HHE. ML:1.9 0.0000748 0.22 AML other m 2021-02-18T04:10:34.70
MN.BNI.HHE. ML:1.4 0.000040999785000000006 0.9408 AML other m 2021-02-18T04:10:26.98
MN.BNI.HNN. ML:1.4 0.000038784536500000004 0.3808 AML other m 2021-02-18T04:10:27.51
MN.BNI.HNE. ML:1.6 0.00005100917 0.1408 AML other m 2021-02-18T04:10:26.99
MN.BNI.HHN. ML:1.0 0.000015562785 1.9392 AML other m 2021-02-18T04:10:27.07
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
Waveforms Seismic signals in miniseed + resp format Download