Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 15-08-2021 and time 20:55:07 (Italy) in region 9 km NW Saint Rhémy en Bosses (AO)

A magnitude ML 1.2 earthquake occured in region: 9 km NW Saint Rhémy en Bosses (AO), on

  • 15-08-2021 18:55:07 (UTC)
  • 15-08-2021 20:55:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.8660, 7.0860 at 9 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.

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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
Saint-Rhémy-en-Bosses AO 9 338 338
Saint-Oyen AO 11 203 541
Courmayeur AO 12 2807 3348
Etroubles AO 13 501 3849
Morgex AO 13 2104 5953
La Salle AO 13 2087 8040
Pré-Saint-Didier AO 14 1050 9090
Allein AO 16 229 9319
Ollomont AO 18 157 9476
Saint-Nicolas AO 18 311 9787
Doues AO 18 510 10297
Avise AO 18 305 10602
Gignod AO 19 1710 12312
Arvier AO 19 873 13185
Valpelline AO 19 657 13842
La Thuile AO 20 761 14603
Roisan AO 20 1036 15639

Municipalities with at least 50000 inhabitants

An earthquake occurred to
100 Km NW of Torino (890529 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
Reviewed
Rev100 		ML 1.2 2021-08-15
18:55:07		 45.8658 7.0862 9 2021-08-15
19:24:12		 Sala Sismica INGV-Roma 94216461
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-15 18:55:07 ± 0.23
Latitude 45.8658 ± 0.0099
Longitude 7.0862 ± 0.0310
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94216461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2394
Semi-minor axis of confidence ellipse (meter) 832
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 277
Circular confidence region, given by single value of horizontal uncertainty (meter) 2390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 130
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.44
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.87594
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 94216461
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-15 19:24:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EUCT.HNZ. 2021-08-15T18:56:03.26 3.0 undecidable manual Sg 0.23 0
GU.ENR.HHZ. 2021-08-15T18:55:59.63 3.0 undecidable manual S -1.16 0
MN.BNI.HHZ. 2021-08-15T18:55:37.11 3.0 undecidable manual S 0.21 0
GU.RSP.HHE. 2021-08-15T18:55:32.39 0.1 undecidable manual S 170 80.8635 50 0.26 85
CH.GIMEL.HHE. 2021-08-15T18:55:24.35 0.1 undecidable manual P 320 97.2249 50 0.04 86
GU.RSP.HHE. 2021-08-15T18:55:22.66 0.3 undecidable manual P 170 80.8635 50 0.88 52
GU.LSD.HHZ. 2021-08-15T18:55:21.89 0.1 undecidable manual S 175 45.2214 50 -0.74 78
GU.TRAV.HHZ. 2021-08-15T18:55:20.01 0.6 undecidable manual P 127 64.491 50 0.75 37
CH.DIX.HHZ. 2021-08-15T18:55:19.44 0.3 undecidable manual S 46 34.3434 50 -0.3 69
GU.LSD.HHZ. 2021-08-15T18:55:16.31 0.3 undecidable manual P 175 45.2214 50 0.02 71
CH.DIX.HHZ. 2021-08-15T18:55:14.53 0.1 undecidable manual P 46 34.3434 50 -0.09 96
IV.MRGE.HHZ. 2021-08-15T18:55:12.30 0.1 undecidable manual S 190 10.878 129 -0.2 97
IV.MRGE.HHZ. 2021-08-15T18:55:10.50 0.1 positive manual P 190 10.878 129 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MRGE.HHE. ML:1.3 0.00025 0.1 AML other m 2021-08-15T18:55:12.61
IV.MRGE.HHN. ML:1.5 0.00039600000000000003 0.42 AML other m 2021-08-15T18:55:12.54
CH.DIX.HHE. ML:1.2 0.00007255 0.74 AML other m 2021-08-15T18:55:20.46
CH.DIX.HHN. ML:1.2 0.00006429999999999999 0.5 AML other m 2021-08-15T18:55:20.46
GU.LSD.HHN. ML:1.1 0.000034149999999999997 0.8 AML other m 2021-08-15T18:55:22.58
GU.LSD.HHE. ML:1.3 0.0000599 0.16 AML other m 2021-08-15T18:55:22.20
GU.TRAV.HHE. ML:0.9 0.000017123970000000002 0.1408 AML other m 2021-08-15T18:55:29.47
GU.TRAV.HHN. ML:0.9 0.000015079075 0.256 AML other m 2021-08-15T18:55:33.84
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