Earthquake with magnitude of ML 1.5 on date 18-09-2020 and time 17:40:56 (Italy) in region Costa Francese (FRANCIA)

A magnitude ML 1.5 earthquake occured in region: Costa Francese (FRANCIA), on

  • 18-09-2020 15:40:56 (UTC)
  • 18-09-2020 17:40:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6, 7.15 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.

Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
57 Km W of Sanremo (54807 inhabitants)
94 Km SW of Cuneo (56081 inhabitants)
Recent and historical Seismicity
Seismic hazard
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire ( that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 1.5 2020-09-18
43.6 7.15 10 2020-09-18
Sala Sismica INGV-Roma 83007411
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2020-09-18 15:40:56 ± 0.18
Latitude 43.60 ± 0.01
Longitude 7.15 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83007411


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 860
Semi-minor axis of confidence ellipse (meter) 740
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 233
Circular confidence region, given by single value of horizontal uncertainty (meter) 860
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 324
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.65381
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 3
Magnitude information


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 Takeoff_angle Residual Weight
IV.NOV.HHZ. 2020-09-18T15:42:54.70 3.0 negative manual Pn 2.24 0
IV.FIAM.HHZ. 2020-09-18T15:42:54.87 3.0 undecidable manual Sn -1.1 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
GU.RNCA.HHZ. 2020-09-18T15:41:43.68 3.0 undecidable manual Sn 0.06 0
RD.PGF.BHZ. 2020-09-18T15:41:23.66 3.0 undecidable manual Pn 0.6 0
GU.ENR.HHZ. 2020-09-18T15:41:19.08 0.1 undecidable manual S 18 0.6529 50 0.11 98
GU.STV.HHZ. 2020-09-18T15:41:18.87 0.1 undecidable manual S 11 0.6538 50 -0.13 97
GU.MGRO.HHZ. 2020-09-18T15:41:18.84 0.1 undecidable manual S 47 0.6484 50 0.01 100
GU.CANO.HHZ. 2020-09-18T15:41:14.52 3.0 undecidable manual P -0.05 0
GU.MGRO.HHZ. 2020-09-18T15:41:09.51 0.1 undecidable manual P 47 0.6484 50 -0.06 99
GU.STV.HHZ. 2020-09-18T15:41:09.72 0.3 negative manual P 11 0.6538 50 0.05 74
GU.ENR.HHZ. 2020-09-18T15:41:09.68 0.1 undecidable manual P 18 0.6529 50 0.03 100
IV.IMI.HHZ. 2020-09-18T15:41:08.90 3.0 positive manual P -0.55 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHE. ML:1.7 4.08E-5 1.02 AML other m 2020-09-18T15:41:35.23
GU.CANO.HHN. ML:1.4 1.775E-5 1.3 AML other m 2020-09-18T15:41:47.28
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download