Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 20-12-2023 and time 17:20:54 (UTC) in region Confine Italia Francia (FRANCIA)

A magnitude ML 1.0 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 20-12-2023 17:20:54 (UTC)
  • 20-12-2023 18:20:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1260, 7.4310 at 10 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
Entracque CN 13 774 774
Limone Piemonte CN 14 1485 2259
Vernante CN 16 1178 3437
Roaschia CN 16 107 3544
Valdieri CN 17 935 4479
Robilante CN 20 2306 6785

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Cuneo (56081 inhabitants)
44 Km NW of Sanremo (54807 inhabitants)
86 Km W of Savona (61345 inhabitants)
99 Km S 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 1.0 2023-12-20
17:20:54		 44.1263 7.4313 10 2023-12-20
17:27:07		 Sala Sismica INGV-Roma 124165431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-20 17:20:54 ± 0.13
Latitude 44.1263 ± 0.0081
Longitude 7.4313 ± 0.0138
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 124165431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1270
Semi-minor axis of confidence ellipse (meter) 391
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 237
Circular confidence region, given by single value of horizontal uncertainty (meter) 1270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 163
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.10342
Epicentral distance of station farthest from the epicenter (degree) 0.89842
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 124165431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-20 17:27:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.PCP.HHZ. 2023-12-20T17:21:11.63 1.0 undecidable manual P 62 99.7224 50 0.74 18
GU.PZZ.HHE. 2023-12-20T17:21:09.12 0.6 undecidable manual S 329 49.0176 50 -0.61 43
GU.BHB.HHE. 2023-12-20T17:21:08.05 0.3 undecidable manual P 350 79.7646 50 0.22 67
GU.IMI.HHZ. 2023-12-20T17:21:07.80 0.6 undecidable manual S 123 43.9227 50 -0.57 44
GU.CANO.HHZ. 2023-12-20T17:21:05.96 0.6 positive manual P 82 64.7907 50 0.45 44
GU.GBOS.HHZ. 2023-12-20T17:21:05.42 0.6 undecidable manual S 68 34.9428 50 -0.54 45
GU.RORO.HHZ. 2023-12-20T17:21:03.48 0.3 negative manual P 92 50.616 50 0.15 72
GU.PZZ.HHE. 2023-12-20T17:21:03.17 0.1 undecidable manual P 329 49.0176 50 0.08 98
GU.IMI.HHZ. 2023-12-20T17:21:02.38 0.3 positive manual P 123 43.9227 50 0.08 74
GU.BURY.HHZ. 2023-12-20T17:21:01.70 0.3 undecidable manual P 165 39.4272 50 0.09 74
GU.GBOS.HHZ. 2023-12-20T17:21:01.01 0.1 undecidable manual P 68 34.9428 50 0.1 100
FR.SAOF.HHZ. 2023-12-20T17:21:00.92 0.6 undecidable manual S 148 18.3705 119 -0.39 48
GU.STV.HHZ. 2023-12-20T17:21:00.08 0.6 undecidable manual S 328 15.5733 123 -0.42 48
GU.ENR.HHZ. 2023-12-20T17:20:59.05 0.6 undecidable manual S 355 11.4774 132 -0.31 50
FR.SAOF.HHZ. 2023-12-20T17:20:58.34 1.0 undecidable manual P 148 18.3705 119 0.11 26
GU.STV.HHZ. 2023-12-20T17:20:57.79 1.0 undecidable manual P 328 15.5733 123 0.03 26
GU.ENR.HHZ. 2023-12-20T17:20:57.48 0.1 undecidable manual P 355 11.4774 132 0.38 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
FR.SAOF.HHE.00 ML:0.9 0.000061370785 0.064 AML other m 2023-12-20T17:21:01.21
FR.SAOF.HHN.00 ML:1.0 0.000074761175 0.0512 AML other m 2023-12-20T17:21:01.75
GU.GBOS.HHN. ML:1.0 0.00004291647499999999 0.1792 AML other m 2023-12-20T17:21:05.72
GU.GBOS.HHE. ML:0.8 0.000024485475 0.1024 AML other m 2023-12-20T17:21:06.00
GU.IMI.HHN. ML:1.3 0.000059281915 0.1664 AML other m 2023-12-20T17:21:08.89
GU.IMI.HHE. ML:1.1 0.000037287815 0.064 AML other m 2023-12-20T17:21:08.72
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