Earthquake (controlled explosion) with magnitude of ML 1.6 on date 18-09-2020 and time 15:40:53 (UTC) in region Costa Francese (FRANCIA)

A magnitude ML 1.6 (controlled explosion) earthquake occured in region: Costa Francese (FRANCIA), on

  • 18-09-2020 15:40:53 (UTC)
  • 18-09-2020 17:40:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4670, 7.0740 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: controlled explosion.

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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
70 Km SW of Sanremo (54807 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 1.6 2020-09-18
15:40:53
43.4673 7.0735 1 2021-02-26
14:56:20
Bollettino Sismico Italiano INGV 87376041
Reviewed
Rev100
ML 1.5 2020-09-18
15:40:56
43.6038 7.1457 10 2020-09-18
15:52:31
Sala Sismica INGV-Roma 83007411
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-18 15:40:53 ± 0.28
Latitude 43.4673 ± 0.0126
Longitude 7.0735 ± 0.0248
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type controlled explosion
Origin ID 87376041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2130
Semi-minor axis of confidence ellipse (meter) 1280
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 247
Circular confidence region, given by single value of horizontal uncertainty (meter) 2130.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 240
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.68083
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 87376041
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-22 12:01:40

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 83007411
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-18 15:52:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIAM.HHZ. 2020-09-18T15:42:54.87 3.0 undecidable manual Sn -1.1 0
IV.NOV.HHZ. 2020-09-18T15:42:54.70 3.0 negative manual Pn 2.24 0
IV.FDMO.HHZ. 2020-09-18T15:42:52.52 3.0 undecidable manual Sn 1.26 0
IV.PANTE.HHZ. 2020-09-18T15:42:46.38 3.0 undecidable manual Pn 1.53 0
IV.NARO.HHZ. 2020-09-18T15:42:07.52 3.0 undecidable manual Pg 12.8 0
IV.IMOL.HNZ. 2020-09-18T15:41:51.39 3.0 positive manual Pn 3.93 0
RD.PGF.BHZ. 2020-09-18T15:41:24.86 0.3 undecidable manual P 122 186.5688 38 0.03 55
GU.PZZ.HHE. 2020-09-18T15:41:14.24 0.3 undecidable manual P 2 115.2957 50 0.35 66
GU.GBOS.HHZ. 2020-09-18T15:41:12.32 0.3 undecidable manual P 35 105.5166 50 -0.05 72
GU.STV.HHZ. 2020-09-18T15:41:09.67 0.1 undecidable manual P 13 88.6446 50 -0.09 98
GU.ENR.HHZ. 2020-09-18T15:41:09.68 0.3 undecidable manual P 18 88.9443 50 -0.13 73
GU.MGRO.HHZ. 2020-09-18T15:41:09.51 0.1 undecidable manual P 42 86.8464 50 0.02 100
FR.SAOF.HHZ.00 2020-09-18T15:41:06.50 0.3 undecidable manual P 34 69.1752 50 -0.27 74
GU.BURY.HNZ. 2020-09-18T15:41:04.01 0.3 undecidable manual P 48 52.2033 91 0.21 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHE. ML:1.8 0.0000408 1.02 AML other m 2020-09-18T15:41:35.23
GU.CANO.HHN. ML:1.4 0.00001775 1.3 AML other m 2020-09-18T15:41:47.28
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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