Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 18-04-2021 and time 00:28:59 (Italy) in region Confine Italia Francia (FRANCIA)

A magnitude ML 1.4 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 17-04-2021 22:28:59 (UTC)
  • 18-04-2021 00:28:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.9810, 7.2990 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km W of Sanremo (54807 inhabitants)
50 Km SW of Cuneo (56081 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 2021-04-17
22:28:59		 43.9807 7.2992 11 2021-04-17
22:36:36		 Sala Sismica INGV-Roma 89191351
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-17 22:28:59 ± 0.24
Latitude 43.9807 ± 0.0090
Longitude 7.2992 ± 0.0137
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 89191351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1284
Semi-minor axis of confidence ellipse (meter) 393
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 229
Circular confidence region, given by single value of horizontal uncertainty (meter) 1280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 202
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.00724
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 89191351
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-17 22:36:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MILN.HNZ. 2021-04-17T22:29:37.56 3.0 undecidable manual Pg 4.22 0
GU.BHB.HHZ. 2021-04-17T22:29:27.55 0.6 undecidable manual S 358 94.8384 50 -0.19 57
IV.QLNO.HHZ. 2021-04-17T22:29:27.18 0.6 undecidable manual S 65 91.6416 50 0.31 56
GU.CANO.HHZ. 2021-04-17T22:29:23.71 0.6 undecidable manual S 71 78.8655 50 0.24 58
IV.MONC.HHZ. 2021-04-17T22:29:23.82 3.0 negative manual P 2.6 0
GU.RRL.HHE. 2021-04-17T22:29:19.06 0.3 undecidable manual P 339 111.7992 50 0.5 77
GU.GBOS.HHZ. 2021-04-17T22:29:16.26 0.6 undecidable manual S 56 51.9036 50 -0.01 64
GU.BHB.HHZ. 2021-04-17T22:29:15.34 0.3 undecidable manual P 358 94.8384 50 -0.61 77
IV.QLNO.HHZ. 2021-04-17T22:29:15.05 0.3 undecidable manual P 65 91.6416 50 -0.41 82
GU.IMI.HHZ. 2021-04-17T22:29:15.12 0.6 undecidable manual S 99 48.1185 50 -0.14 63
GU.CANO.HHZ. 2021-04-17T22:29:14.34 0.3 undecidable manual P 71 78.8655 50 0.86 71
GU.RORO.HHE. 2021-04-17T22:29:11.50 0.3 undecidable manual P 76 62.8926 50 0.47 86
GU.PZZ.HHE. 2021-04-17T22:29:10.78 0.3 undecidable manual P 346 60.0954 50 0.18 91
GU.BURY.HHE. 2021-04-17T22:29:09.73 0.6 undecidable manual S 137 30.1476 50 -0.74 55
GU.GBOS.HHZ. 2021-04-17T22:29:09.76 0.3 undecidable manual P 56 51.9036 50 0.43 88
GU.STV.HHE. 2021-04-17T22:29:09.68 0.6 undecidable manual S 4 29.4483 50 -0.59 58
GU.ENR.HHZ. 2021-04-17T22:29:09.90 0.3 undecidable manual S 19 29.1486 50 -0.31 94
GU.IMI.HHZ. 2021-04-17T22:29:08.81 0.3 undecidable manual P 99 48.1185 50 0.07 96
FR.SAOF.HHZ.00 2021-04-17T22:29:07.50 0.6 undecidable manual S 88 20.2686 118 -0.29 64
GU.ENR.HHZ. 2021-04-17T22:29:05.96 0.3 undecidable manual P 19 29.1486 50 0.13 98
GU.BURY.HHE. 2021-04-17T22:29:05.93 0.3 undecidable manual P 137 30.1476 50 -0.05 99
GU.STV.HHE. 2021-04-17T22:29:05.85 0.3 undecidable manual P 4 29.4483 50 -0.01 100
FR.SAOF.HHZ.00 2021-04-17T22:29:04.28 0.3 undecidable manual P 88 20.2686 118 -0.15 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
FR.SAOF.HHE.00 ML:1.4 0.0001863376 0.064 AML other m 2021-04-17T22:29:08.47
FR.SAOF.HHN.00 ML:1.3 0.00012882285 0.064 AML other m 2021-04-17T22:29:08.15
GU.IMI.HHN. ML:1.5 0.00009235 0.42 AML other m 2021-04-17T22:29:15.63
GU.IMI.HHE. ML:1.3 0.0000488432 0.1408 AML other m 2021-04-17T22:29:16.08
GU.GBOS.HHE. ML:1.6 0.0000991 0.16 AML other m 2021-04-17T22:29:16.46
GU.GBOS.HHN. ML:1.4 0.00005635 0.16 AML other m 2021-04-17T22:29:16.47
GU.CANO.HHN. ML:1.4 0.00004130036 0.2688 AML other m 2021-04-17T22:29:24.06
IV.QLNO.HHN. ML:1.2 0.00001968361 0.2432 AML other m 2021-04-17T22:29:31.80
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