Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 26-09-2021 and time 08:29:44 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude ML 0.6 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 26-09-2021 06:29:44 (UTC)
  • 26-09-2021 08:29:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0000, 7.6140 at 13 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Pigna IM 8 859 859
Castel Vittorio IM 9 287 1146
Triora IM 12 355 1501
Rocchetta Nervina IM 12 298 1799
Molini di Triora IM 13 617 2416
Isolabona IM 13 679 3095
Bajardo IM 14 312 3407
Apricale IM 14 629 4036
Briga Alta CN 14 39 4075
Airole IM 15 407 4482
Olivetta San Michele IM 15 211 4693
Perinaldo IM 16 870 5563
Dolceacqua IM 17 2074 7637
Mendatica IM 18 185 7822
Montegrosso Pian Latte IM 18 118 7940
Ceriana IM 18 1250 9190
Cosio d'Arroscia IM 19 221 9411
Soldano IM 20 977 10388

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km NW of Sanremo (54807 inhabitants)
44 Km S of Cuneo (56081 inhabitants)
77 Km W of Savona (61345 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 0.6 2021-09-26
06:29:44		 44.0003 7.6138 13 2021-09-26
06:38:26		 Sala Sismica INGV-Roma 95891881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-26 06:29:44 ± 0.16
Latitude 44.0003 ± 0.0099
Longitude 7.6138 ± 0.0113
Depth (km) 13 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95891881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1034
Semi-minor axis of confidence ellipse (meter) 566
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 338
Circular confidence region, given by single value of horizontal uncertainty (meter) 1030.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 77
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.04587
Epicentral distance of station farthest from the epicenter (degree) 0.32016
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 95891881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-26 06:38:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.STV.HHZ. 2021-09-26T06:29:56.80 0.3 undecidable manual S 320 35.5422 96 -0.12 71
GU.GBOS.HHZ. 2021-09-26T06:29:55.44 0.3 undecidable manual S 34 32.2455 97 -0.62 62
GU.ENR.HHE. 2021-09-26T06:29:55.09 0.3 undecidable manual S 329 29.8479 98 -0.32 69
GU.IMI.HHZ. 2021-09-26T06:29:54.30 0.3 undecidable manual S 114 24.4533 101 0.31 70
GU.BURY.HHE. 2021-09-26T06:29:53.19 0.3 undecidable manual S 191 24.5532 101 -0.85 61
GU.STV.HHZ. 2021-09-26T06:29:52.11 0.3 undecidable manual P 320 35.5422 96 0.24 70
GU.ENR.HHE. 2021-09-26T06:29:51.31 0.3 undecidable manual P 329 29.8479 98 0.32 70
GU.GBOS.HHZ. 2021-09-26T06:29:51.55 0.1 undecidable manual P 34 32.2455 97 0.18 95
GU.MGRO.HHZ. 2021-09-26T06:29:51.61 0.3 undecidable manual S 73 16.1727 113 -0.28 71
GU.IMI.HHZ. 2021-09-26T06:29:50.58 0.3 undecidable manual P 114 24.4533 101 0.41 69
GU.MGRO.HHZ. 2021-09-26T06:29:49.04 0.1 undecidable manual P 73 16.1727 113 0.08 100
GU.BURY.HHE. 2021-09-26T06:29:49.76 1.0 undecidable manual P 191 24.5532 101 -0.44 23
FR.SAOF.HHZ.00 2021-09-26T06:29:49.83 0.3 undecidable manual S 252 5.0949 154 0.12 76
FR.SAOF.HHZ.00 2021-09-26T06:29:48.29 0.3 undecidable manual P 252 5.0949 154 0.59 68
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
FR.SAOF.HHN.00 ML:0.8 0.000091352545 0.5408 AML other m 2021-09-26T06:29:50.30
FR.SAOF.HHE.00 ML:1.1 0.00014902500000000003 0.5184 AML other m 2021-09-26T06:29:50.31
GU.MGRO.HHE. ML:0.6 0.000033779775 0.4608 AML other m 2021-09-26T06:29:51.97
GU.MGRO.HHN. ML:0.5 0.000022730275 0.4992 AML other m 2021-09-26T06:29:51.62
GU.MGRO.HNE. ML:0.7 0.00004137840000000001 0.4192 AML other m 2021-09-26T06:29:51.97
GU.MGRO.HNN. ML:0.6 0.000029128265 0.3616 AML other m 2021-09-26T06:29:52.12
GU.IMI.HHE. ML:0.6 0.000027343084999999998 0.48 AML other m 2021-09-26T06:29:54.61
GU.IMI.HHN. ML:0.8 0.00003416102 0.2016 AML other m 2021-09-26T06:29:54.56
GU.GBOS.HHE. ML:0.4 0.000008688116000000001 0.4192 AML other m 2021-09-26T06:29:55.81
GU.GBOS.HHN. ML:0.6 0.000015871556500000003 0.8192 AML other m 2021-09-26T06:29:55.60
GU.STV.HHE. ML:0.7 0.000019707038499999998 0.2016 AML other m 2021-09-26T06:29:56.94
GU.STV.HHN. ML:0.4 0.000010603026000000001 0.2016 AML other m 2021-09-26T06:29:57.80
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