Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 16-07-2021 and time 01:02:18 (Italy) in region 9 km NW Valtournenche (AO)

A magnitude ML 1.6 earthquake occured in region: 9 km NW Valtournenche (AO), on

  • 15-07-2021 23:02:18 (UTC)
  • 16-07-2021 01:02:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.9310, 7.5380 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
Valtournenche AO 9 2277 2277
Bionaz AO 11 236 2513
Chamois AO 12 97 2610
Torgnon AO 15 558 3168
Antey-Saint-André AO 15 602 3770
La Magdeleine AO 15 109 3879
Oyace AO 15 219 4098
Ayas AO 17 1401 5499
Verrayes AO 19 1302 6801
Ollomont AO 20 157 6958
Valpelline AO 20 657 7615
Saint-Denis AO 20 378 7993

Municipalities with at least 50000 inhabitants

An earthquake occurred to
96 Km N of Torino (890529 inhabitants)
100 Km NW of Novara (104380 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 1.6 2021-07-15
23:02:18		 45.9308 7.5378 10 2021-12-29
11:12:33		 Bollettino Sismico Italiano INGV 95987561
Reviewed
Rev100 		ML 1.8 2021-07-15
23:02:18		 45.9523 7.5113 10 2021-07-15
23:10:10		 Sala Sismica INGV-Roma 92800491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-15 23:02:18 ± 0.19
Latitude 45.9308 ± 0.0126
Longitude 7.5378 ± 0.0181
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95987561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1670
Semi-minor axis of confidence ellipse (meter) 1020
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 317
Circular confidence region, given by single value of horizontal uncertainty (meter) 1670.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.48
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.12055
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 95987561
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-08 17:09:57

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 92800491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-15 23:10:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NARO.HHZ. 2021-07-15T23:03:38.72 3.0 undecidable manual Pg 13.08 0
IV.ZONE.HHZ. 2021-07-15T23:03:17.54 3.0 undecidable manual Sn -0.16 0
IV.FIR.HHZ. 2021-07-15T23:03:10.21 3.0 undecidable manual Pn -3.57 0
IV.VARE.HHZ. 2021-07-15T23:02:47.01 0.6 undecidable manual S 94 95.3379 50 0.11 44
GU.RSP.HHZ. 2021-07-15T23:02:45.92 0.6 undecidable manual S 194 89.3439 50 0.63 39
GU.BHB.HHZ. 2021-07-15T23:02:39.71 0.3 undecidable manual P 190 123.3876 50 0.4 59
CH.BNALP.HHE. 2021-07-15T23:02:39.53 0.3 undecidable manual P 33 124.3866 50 0.07 63
CH.GIMEL.HHZ. 2021-07-15T23:02:39.88 0.3 undecidable manual P 305 118.3926 50 1.35 40
MN.BNI.HHZ. 2021-07-15T23:02:39.12 0.3 undecidable manual P 215 118.1928 50 0.61 56
IV.MONC.HHZ. 2021-07-15T23:02:38.26 0.6 undecidable manual P 162 99.7224 50 2.59 9
CH.MUGIO.HHZ. 2021-07-15T23:02:38.73 0.3 undecidable manual P 90 115.995 50 0.55 58
GU.LSD.HHZ. 2021-07-15T23:02:37.10 0.6 undecidable manual S 211 60.8946 50 -0.59 42
CH.FUSIO.HHZ. 2021-07-15T23:02:36.47 0.3 undecidable manual P 56 104.118 50 0.12 65
IV.VARE.HHZ. 2021-07-15T23:02:35.56 0.3 undecidable manual P 94 95.3379 50 0.57 60
GU.TRAV.HHZ. 2021-07-15T23:02:34.40 0.6 undecidable manual S 161 49.1175 50 -0.16 48
GU.RSP.HHZ. 2021-07-15T23:02:34.48 0.3 undecidable manual P 194 89.3439 50 0.41 63
IV.MRGE.HHZ. 2021-07-15T23:02:31.14 0.6 undecidable manual S 244 40.9257 50 -1.22 33
GU.CIRO.HHZ. 2021-07-15T23:02:30.56 0.6 undecidable manual S 176 36.5412 50 -0.63 43
GU.LSD.HHZ. 2021-07-15T23:02:29.67 0.1 undecidable manual P 211 60.8946 50 -0.01 97
CH.MMK.HHZ. 2021-07-15T23:02:29.42 0.6 undecidable manual S 68 35.4423 50 -1.47 29
GU.TRAV.HHZ. 2021-07-15T23:02:27.88 0.1 positive manual P 161 49.1175 50 0.01 99
IV.MRGE.HHZ. 2021-07-15T23:02:26.02 0.1 negative manual P 244 40.9257 50 -0.58 88
GU.CIRO.HHZ. 2021-07-15T23:02:25.85 0.1 undecidable manual P 176 36.5412 50 -0.08 100
CH.MMK.HHZ. 2021-07-15T23:02:24.93 0.1 negative manual P 68 35.4423 50 -0.82 80
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
CH.MMK.HHN. ML:0.9 0.000027545155000000002 0.4352 AML other m 2021-07-15T23:02:30.60
CH.MMK.HHE. ML:0.7 0.000020232485000000002 0.5504 AML other m 2021-07-15T23:02:30.73
GU.CIRO.HHN. ML:1.2 0.00006432445000000001 0.2944 AML other m 2021-07-15T23:02:31.07
GU.CIRO.HHE. ML:1.5 0.0001215 0.5 AML other m 2021-07-15T23:02:31.59
IV.MRGE.HHN. ML:1.8 0.00020014851 0.2816 AML other m 2021-07-15T23:02:31.66
IV.MRGE.HHE. ML:1.7 0.00018448452999999997 0.384 AML other m 2021-07-15T23:02:31.82
GU.TRAV.HHN. ML:2.0 0.000248 0.16 AML other m 2021-07-15T23:02:34.95
GU.TRAV.HHE. ML:2.0 0.0002384694 0.2176 AML other m 2021-07-15T23:02:34.87
GU.LSD.HHN. ML:1.7 0.00009465166 0.2048 AML other m 2021-07-15T23:02:38.43
GU.LSD.HHE. ML:1.6 0.00007295467 0.1408 AML other m 2021-07-15T23:02:38.42
GU.RSP.HHN. ML:1.7 0.0000667417 0.4992 AML other m 2021-07-15T23:02:46.39
GU.RSP.HHE. ML:1.7 0.0000642824 0.2688 AML other m 2021-07-15T23:02:46.39
IV.VARE.HHN. ML:1.8 0.000076594075 0.3456 AML other m 2021-07-15T23:02:47.44
IV.VARE.HHE. ML:1.6 0.000044919715 0.7808 AML other m 2021-07-15T23:02:48.03
CH.MUGIO.HHN. ML:1.6 0.000030236275 0.256 AML other m 2021-07-15T23:02:53.89
MN.BNI.HHN. ML:1.3 0.00001546179 2.2016 AML other m 2021-07-15T23:02:53.91
CH.MUGIO.HHE. ML:1.5 0.00002271008 0.384 AML other m 2021-07-15T23:02:53.92
GU.BHB.HHE. ML:1.6 0.00002779709 0.3072 AML other m 2021-07-15T23:02:55.58
GU.BHB.HHN. ML:1.6 0.00002943407 1.1392 AML other m 2021-07-15T23:02:55.94
IV.ZONE.HHE. ML:1.9 0.000023295420000000002 0.8192 AML other m 2021-07-15T23:03:18.57
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