Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 07-04-2021 and time 04:40:44 (Italy) in region Confine Italia Francia (FRANCIA)

A magnitude ML 1.5 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 07-04-2021 02:40:44 (UTC)
  • 07-04-2021 04:40:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.5280, 6.7060 at 12 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
69 Km W of Cuneo (56081 inhabitants)
94 Km SW of Moncalieri (57294 inhabitants)
98 Km SW 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
Bulletin
Rev1000 		ML 1.5 2021-04-07
02:40:44		 44.5285 6.7065 12 2021-07-12
16:55:09		 Bollettino Sismico Italiano INGV 89794341
Reviewed
Rev100 		ML 1.6 2021-04-07
02:40:44		 44.5317 6.7263 15 2021-04-07
02:54:40		 Sala Sismica INGV-Roma 88864001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-07 02:40:44 ± 0.13
Latitude 44.5285 ± 0.0072
Longitude 6.7065 ± 0.0088
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89794341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 750
Semi-minor axis of confidence ellipse (meter) 669
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 38
Circular confidence region, given by single value of horizontal uncertainty (meter) 750.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 172
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.29228
Epicentral distance of station farthest from the epicenter (degree) 1.13944
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 4
Type of magnitude ML
Reference to an origin 88864001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-07 02:54:40

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 89794341
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-05 10:54:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.CANO.HHZ. 2021-04-07T02:41:21.27 1.0 undecidable manual S 106 126.4734 90 0.5 20
GU.IMI.HHZ. 2021-04-07T02:41:18.40 0.3 undecidable manual S 126 116.5944 90 0.27 65
GU.GBOS.HHZ. 2021-04-07T02:41:11.99 0.3 undecidable manual S 109 95.3379 90 -0.46 62
FR.SAOF.HHE.00 2021-04-07T02:41:10.92 0.3 undecidable manual S 132 90.243 91 -0.17 67
GU.RSP.HNN. 2021-04-07T02:41:09.04 0.3 undecidable manual S 32 81.5517 91 0.26 70
RD.ORIF.BHE. 2021-04-07T02:41:07.76 0.3 undecidable manual S 304 78.1662 91 -0.12 67
GU.CANO.HHZ. 2021-04-07T02:41:05.92 0.1 undecidable manual P 106 126.4734 90 0.46 82
GU.IMI.HHZ. 2021-04-07T02:41:04.47 0.1 undecidable manual P 126 116.5944 90 0.53 82
GU.ENR.HHZ. 2021-04-07T02:41:03.77 0.6 undecidable manual S 120 65.49 91 -0.71 40
MN.BNI.HHE. 2021-04-07T02:41:02.35 0.3 undecidable manual S 358 58.0974 91 -0.17 70
GU.BHB.HHZ. 2021-04-07T02:41:01.46 0.3 undecidable manual S 52 55.5999 91 -0.38 68
GU.STV.HHZ. 2021-04-07T02:41:01.72 0.3 undecidable manual S 122 58.2972 91 -0.86 57
GU.GBOS.HHZ. 2021-04-07T02:41:00.92 0.1 undecidable manual P 109 95.3379 90 0.26 91
FR.SAOF.HHE.00 2021-04-07T02:41:00.32 0.1 undecidable manual P 132 90.243 91 0.45 88
GU.RSP.HNN. 2021-04-07T02:40:59.18 0.1 undecidable manual P 32 81.5517 91 0.64 86
GU.RRL.HHZ. 2021-04-07T02:40:58.59 0.3 undecidable manual S 9 44.0226 91 -0.17 72
RD.ORIF.BHE. 2021-04-07T02:40:57.92 0.1 undecidable manual P 304 78.1662 91 -0.1 91
GU.ENR.HHZ. 2021-04-07T02:40:56.21 0.1 undecidable manual P 120 65.49 91 0.16 98
GU.PZZ.HHZ. 2021-04-07T02:40:55.14 0.3 undecidable manual S 94 32.4453 92 -0.53 68
MN.BNI.HHE. 2021-04-07T02:40:54.93 0.1 undecidable manual P 358 58.0974 91 0.01 97
GU.BHB.HHZ. 2021-04-07T02:40:54.70 0.1 undecidable manual P 52 55.5999 91 0.17 100
GU.STV.HHZ. 2021-04-07T02:40:54.83 0.1 undecidable manual P 122 58.2972 91 -0.12 96
GU.RRL.HHZ. 2021-04-07T02:40:52.76 0.1 undecidable manual P 9 44.0226 91 0.01 100
GU.PZZ.HHZ. 2021-04-07T02:40:50.70 0.1 undecidable manual P 94 32.4453 92 -0.27 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BHB.HHN. ML:1.4 0.000053505835 0.32 AML other m 2021-04-07T02:41:01.69
GU.BHB.HHE. ML:1.2 0.000041223209999999996 0.0992 AML other m 2021-04-07T02:41:03.05
GU.ENR.HHN. ML:1.9 0.00014549999999999999 0.42 AML other m 2021-04-07T02:41:05.63
GU.ENR.HHE. ML:2.0 0.00017099999999999998 0.06 AML other m 2021-04-07T02:41:05.79
GU.GBOS.HHE. ML:1.4 0.000029568695 0.12 AML other m 2021-04-07T02:41:12.76
GU.GBOS.HHN. ML:1.4 0.000025545339 0.68 AML other m 2021-04-07T02:41:12.68
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