Earthquake with magnitude of ML 1.2 on date 18-08-2023 and time 05:31:46 (UTC) in region 4 km N Avise (AO)

A magnitude ML 1.2 earthquake occured in region: 4 km N Avise (AO), on

  • 18-08-2023 05:31:46 (UTC)
  • 18-08-2023 07:31:46 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 45.7450, 7.1360 at 7 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.

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 4 305 305
Saint-Nicolas AO 4 311 616
La Salle AO 5 2087 2703
Arvier AO 5 873 3576
Introd AO 7 658 4234
Villeneuve AO 7 1289 5523
Morgex AO 8 2104 7627
Saint-Pierre AO 8 3165 10792
Aymavilles AO 10 2086 12878
Saint-Rhémy-en-Bosses AO 10 338 13216
Sarre AO 10 4927 18143
Rhêmes-Saint-Georges AO 10 194 18337
Saint-Oyen AO 11 203 18540
Jovençan AO 11 736 19276
Etroubles AO 11 501 19777
Pré-Saint-Didier AO 12 1050 20827
Gressan AO 12 3387 24214
Gignod AO 13 1710 25924
Allein AO 13 229 26153
Courmayeur AO 14 2807 28960
Valgrisenche AO 14 196 29156
Roisan AO 14 1036 30192
Aosta AO 14 34390 64582
La Thuile AO 15 761 65343
Charvensod AO 15 2468 67811
Doues AO 16 510 68321
Saint-Christophe AO 17 3432 71753
Pollein AO 17 1569 73322
Valpelline AO 18 657 73979
Valsavarenche AO 18 161 74140
Ollomont AO 18 157 74297
Rhêmes-Notre-Dame AO 19 89 74386

Municipalities with at least 50000 inhabitants

An earthquake occurred to
86 Km NW of Torino (890529 inhabitants)
93 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
Reviewed
Rev100
ML 1.2 2023-08-18
05:31:46
45.7447 7.1358 7 2023-08-18
05:42:06
Sala Sismica INGV-Roma 120244451
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-08-18 05:31:46 ± 0.21
Latitude 45.7447 ± 0.0108
Longitude 7.1358 ± 0.0206
Depth (km) 7 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 120244451

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1665
Semi-minor axis of confidence ellipse (meter) 971
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 245
Circular confidence region, given by single value of horizontal uncertainty (meter) 1660.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 116
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.49
Epicentral distance of station closest to the epicenter (degree) 0.05756
Epicentral distance of station farthest from the epicenter (degree) 0.48563
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
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 120244451
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-18 05:42:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.TRAV.HHZ. 2023-08-18T05:32:04.29 0.1 undecidable manual S 118 53.9016 50 -0.27 93
CH.DIX.HHZ. 2023-08-18T05:32:01.28 0.1 undecidable manual S 29 42.7239 50 -0.3 94
GU.CIRO.HHZ. 2023-08-18T05:31:59.65 0.1 undecidable manual S 115 37.0296 101 -0.3 95
GU.LSD.HHZ. 2023-08-18T05:31:57.57 0.1 undecidable manual S 180 31.6461 103 -0.54 91
GU.TRAV.HHZ. 2023-08-18T05:31:57.79 0.6 undecidable manual P 118 53.9016 50 0.71 41
CH.DIX.HHZ. 2023-08-18T05:31:55.67 1.0 positive manual P 29 42.7239 50 0.32 23
GU.CIRO.HHZ. 2023-08-18T05:31:55.01 0.1 positive manual P 115 37.0296 101 0.59 88
GU.LSD.HHZ. 2023-08-18T05:31:53.89 0.1 undecidable manual P 180 31.6461 103 0.54 91
IV.MRGE.HHZ. 2023-08-18T05:31:49.80 0.1 undecidable manual S 296 6.3936 138 -0.41 98
IV.MRGE.HHZ. 2023-08-18T05:31:49.11 0.1 undecidable manual P 296 6.3936 138 0.32 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.LSD.HHE. ML:1.4 0.0001065 0.18 AML other m 2023-08-18T05:31:57.61
GU.LSD.HHN. ML:1.1 0.000054199999999999996 1.68 AML other m 2023-08-18T05:31:57.12
GU.CIRO.HHN. ML:1.2 0.000056999999999999996 0.16 AML other m 2023-08-18T05:31:59.77
GU.CIRO.HHE. ML:0.8 0.000024500000000000003 0.16 AML other m 2023-08-18T05:31:59.69
CH.DIX.HHE. ML:1.5 0.00010894999999999999 0.24 AML other m 2023-08-18T05:32:01.38
CH.DIX.HHN. ML:1.4 0.00008385 1.42 AML other m 2023-08-18T05:32:02.98
GU.TRAV.HHE. ML:1.1 0.000028499999999999998 0.22 AML other m 2023-08-18T05:32:05.17
GU.TRAV.HHN. ML:1.2 0.00004015 0.9 AML other m 2023-08-18T05:32:05.07
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