Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 26-09-2023 and time 22:56:53 (Italy) in region V3 Monte Bianco (ITALIA, FRANCIA, SVIZZERA)

A magnitude ML 1.4 earthquake occured in region: V3 Monte Bianco (ITALIA, FRANCIA, SVIZZERA), on

  • 26-09-2023 20:56:53 (UTC)
  • 26-09-2023 22:56:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.8920, 7.0880 at 11 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 11 338 338
Saint-Oyen AO 12 203 541
Etroubles AO 14 501 1042
Courmayeur AO 14 2807 3849
Morgex AO 16 2104 5953
La Salle AO 16 2087 8040
Pré-Saint-Didier AO 16 1050 9090
Allein AO 17 229 9319
Ollomont AO 18 157 9476
Doues AO 19 510 9986

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 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 1.4 2023-09-26
20:56:53		 45.8925 7.0882 11 2023-09-26
21:01:20		 Sala Sismica INGV-Roma 121497131
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-26 20:56:53 ± 0.22
Latitude 45.8925 ± 0.0108
Longitude 7.0882 ± 0.0220
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121497131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1818
Semi-minor axis of confidence ellipse (meter) 907
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 116
Circular confidence region, given by single value of horizontal uncertainty (meter) 1820.0
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 16
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.85705
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 121497131
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-26 21:01:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.PZZ.HHZ. 2023-09-26T20:57:20.90 3.0 negative manual P 0.57 0
GU.RSP.HHZ. 2023-09-26T20:57:18.12 3.0 undecidable manual S -3.44 0
GU.BHB.HHZ. 2023-09-26T20:57:14.66 3.0 negative manual P -0.72 0
CH.GIMEL.HHE. 2023-09-26T20:57:10.21 0.6 undecidable manual P 319 95.1381 50 0.31 41
GU.LSD.HHZ. 2023-09-26T20:57:08.79 0.3 undecidable manual S 176 48.1185 50 -0.36 67
GU.TRAV.HHZ. 2023-09-26T20:57:06.08 0.6 negative manual P 129 66.1893 50 0.63 40
CH.MMK.HHE. 2023-09-26T20:57:06.09 0.6 undecidable manual P 75 69.7746 50 0.09 45
CH.DIX.HHZ. 2023-09-26T20:57:04.18 0.3 undecidable manual S 50 32.2455 50 -0.73 61
GU.SATI.HHZ. 2023-09-26T20:57:04.55 0.6 positive manual P 92 60.2952 50 0.01 47
GU.CIRO.HHZ. 2023-09-26T20:57:03.22 0.6 positive manual P 131 49.2174 50 0.39 44
GU.LSD.HHZ. 2023-09-26T20:57:03.04 0.1 positive manual P 176 48.1185 50 0.37 89
CH.DIX.HHZ. 2023-09-26T20:57:00.09 0.6 negative manual P 50 32.2455 50 -0.13 48
IV.MRGE.HHZ. 2023-09-26T20:56:59.46 0.1 undecidable manual S 189 13.7751 129 -0.48 92
GU.REMY.HHZ. 2023-09-26T20:56:58.68 0.3 undecidable manual S 139 8.0808 144 0.13 75
IV.MRGE.HHZ. 2023-09-26T20:56:57.25 0.1 positive manual P 189 13.7751 129 -0.1 100
GU.REMY.HHZ. 2023-09-26T20:56:56.81 0.1 undecidable manual P 139 8.0808 144 0.26 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MRGE.HHN. ML:1.8 0.0005899999999999999 0.06 AML other m 2023-09-26T20:56:59.71
IV.MRGE.HHE. ML:2.1 0.001155 0.36 AML other m 2023-09-26T20:56:59.73
GU.LSD.HHE. ML:1.7 0.00014500000000000003 1.86 AML other m 2023-09-26T20:57:09.02
GU.LSD.HHN. ML:1.4 0.0000671 0.46 AML other m 2023-09-26T20:57:09.28
GU.CIRO.HHE. ML:1.0 0.00002815 0.5 AML other m 2023-09-26T20:57:09.47
GU.CIRO.HHN. ML:1.2 0.00004405 1.48 AML other m 2023-09-26T20:57:10.88
GU.SATI.HHN. ML:1.5 0.00005835 0.76 AML other m 2023-09-26T20:57:13.04
GU.SATI.HHE. ML:1.6 0.0000745 0.54 AML other m 2023-09-26T20:57:14.01
GU.RSP.HHN. ML:1.2 0.0000196 0.22 AML other m 2023-09-26T20:57:21.18
GU.RSP.HHE. ML:1.2 0.0000197 0.2 AML other m 2023-09-26T20:57:21.08
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