Earthquake with magnitude of ML 0.5 on date 18-10-2021 and time 02:17:36 (Italy) in region Confine Italia Francia (FRANCIA)

A magnitude ML 0.5 earthquake occured in region: Confine Italia Francia (FRANCIA), on

  • 18-10-2021 00:17:36 (UTC)
  • 18-10-2021 02:17:36 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.925, 7.409 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Olivetta San Michele IM 10 211 211
Airole IM 13 407 618
Rocchetta Nervina IM 16 298 916
Isolabona IM 19 679 1595
Dolceacqua IM 19 2074 3669

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km W of Sanremo (54807 inhabitants)
53 Km S of Cuneo (56081 inhabitants)
96 Km W of Savona (61345 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 (http://www.haisentitoilterremoto.it/) 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
Reviewed
Rev100
ML 0.5 2021-10-18
00:17:36
43.9252 7.4088 10 2021-10-18
00:30:03
Sala Sismica INGV-Roma 96705001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-18 00:17:36 ± 0.26
Latitude 43.9252 ± 0.0126
Longitude 7.4088 ± 0.0200
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 96705001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1768
Semi-minor axis of confidence ellipse (meter) 1037
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 60
Circular confidence region, given by single value of horizontal uncertainty (meter) 1770
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 197
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.45
Epicentral distance of station closest to the epicenter (degree) 0.12051
Epicentral distance of station farthest from the epicenter (degree) 0.61783
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 96705001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-18 00:30:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.PZZ.HHE. 2021-10-18T00:17:56.99 0.3 undecidable manual S 340 0.6178 50 -0.99 51
GU.PZZ.HHE. 2021-10-18T00:17:49.69 0.1 undecidable manual P 340 0.6178 50 0.59 80
GU.STV.HHZ. 2021-10-18T00:17:48.67 0.3 undecidable manual S 350 0.3247 50 -0.64 63
GU.MGRO.HHZ. 2021-10-18T00:17:48.58 0.3 undecidable manual S 68 0.3103 50 -0.29 70
GU.ENR.HHZ. 2021-10-18T00:17:48.18 0.3 undecidable manual S 1 0.304 50 -0.51 66
GU.RORO.HHZ. 2021-10-18T00:17:47.54 0.1 undecidable manual P 68 0.5081 50 0.31 89
GU.GBOS.HHZ. 2021-10-18T00:17:46.55 0.1 undecidable manual P 44 0.4425 50 0.45 87
GU.ENR.HHZ. 2021-10-18T00:17:44.03 0.1 undecidable manual P 1 0.304 50 0.29 93
GU.STV.HHZ. 2021-10-18T00:17:44.34 0.1 undecidable manual P 350 0.3247 50 0.25 93
GU.IMI.HHZ. 2021-10-18T00:17:44.59 0.1 undecidable manual P 92 0.3489 50 0.09 96
GU.BURY.HHZ. 2021-10-18T00:17:43.67 0.3 undecidable manual S 143 0.1781 117 -0.98 56
GU.MGRO.HHZ. 2021-10-18T00:17:43.98 0.1 undecidable manual P 68 0.3103 50 0.14 96
FR.SAOF.HHE.00 2021-10-18T00:17:42.59 0.3 undecidable manual S 60 0.1205 127 -0.16 74
GU.BURY.HHZ. 2021-10-18T00:17:41.45 0.1 undecidable manual P 143 0.1781 117 0.04 100
FR.SAOF.HHE.00 2021-10-18T00:17:40.51 0.1 undecidable manual P 60 0.1205 127 0.2 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.MGRO.HNN. ML:1.6 0.0001787 0.6 AML other m 2021-10-18T00:17:44.74
GU.MGRO.HNE. ML:1.8 0.000236643185 1.27 AML other m 2021-10-18T00:17:43.76
GU.STV.HHE. ML:0.6 1.38E-5 0.1 AML other m 2021-10-18T00:17:49.19
GU.STV.HHN. ML:0.4 1.2375E-5 0.22 AML other m 2021-10-18T00:17:49.22
GU.BURY.HHE. ML:0.3 1.5459045E-5 0.6 AML other m 2021-10-18T00:17:49.30
GU.BURY.HHN. ML:0.3 1.6082965E-5 0.1 AML other m 2021-10-18T00:17:44.13
GU.BURY.HNE. ML:0.7 3.657287E-5 0.61 AML other m 2021-10-18T00:17:41.31
GU.BURY.HNN. ML:0.7 4.1255385E-5 0.5 AML other m 2021-10-18T00:17:40.75
GU.MGRO.HHE. ML:0.1 6.79462635E-6 0.22 AML other m 2021-10-18T00:17:48.59
GU.MGRO.HHN. ML:0.1 6.982833E-6 0.62 AML other m 2021-10-18T00:17:46.04
GU.ENR.HHE. ML:0.4 1.0463419E-5 0.12 AML other m 2021-10-18T00:17:48.29
GU.ENR.HHN. ML:0.4 1.2031255E-5 0.24 AML other m 2021-10-18T00:17:48.29
GU.GBOS.HHE. ML:0.6 9.9737835E-6 0.3 AML other m 2021-10-18T00:17:52.64
GU.GBOS.HHN. ML:0.3 6.9308975E-6 0.32 AML other m 2021-10-18T00:17:52.69
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