Earthquake with magnitude of ML 0.4 on date 26-07-2021 and time 00:42:20 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude ML 0.4 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 25-07-2021 22:42:20 (UTC)
  • 26-07-2021 00:42:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.9700, 7.5620 at 6 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.

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 9 859 859
Rocchetta Nervina IM 9 298 1157
Castel Vittorio IM 10 287 1444
Olivetta San Michele IM 11 211 1655
Airole IM 11 407 2062
Isolabona IM 12 679 2741
Apricale IM 13 629 3370
Dolceacqua IM 14 2074 5444
Bajardo IM 15 312 5756
Perinaldo IM 15 870 6626
Triora IM 16 355 6981
Molini di Triora IM 17 617 7598
Soldano IM 18 977 8575
Camporosso IM 18 5632 14207
San Biagio della Cima IM 18 1329 15536
Seborga IM 19 315 15851
Vallebona IM 19 1310 17161
Ceriana IM 20 1250 18411
Briga Alta CN 20 39 18450

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km NW of Sanremo (54807 inhabitants)
47 Km S of Cuneo (56081 inhabitants)
83 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
Bulletin
Rev1000
ML 0.4 2021-07-25
22:42:20
43.9705 7.5618 6 2021-12-29
11:12:17
Bollettino Sismico Italiano INGV 93666621
Reviewed
Rev100
ML 0.4 2021-07-25
22:42:20
43.9712 7.5663 9 2021-07-25
22:55:32
Sala Sismica INGV-Roma 93214971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-25 22:42:20 ± 0.16
Latitude 43.9705 ± 0.0054
Longitude 7.5618 ± 0.0087
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 93666621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 726
Semi-minor axis of confidence ellipse (meter) 123
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 56
Circular confidence region, given by single value of horizontal uncertainty (meter) 730.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 147
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.01709
Epicentral distance of station farthest from the epicenter (degree) 0.32196
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 93214971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-25 22:55:32

ML:0.4

Field Value
Value 0.4
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 93666621
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-08-04 10:55:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.STV.HHZ. 2021-07-25T22:42:32.95 0.1 undecidable manual S 328 35.742 99 -0.61 82
GU.ENR.HHZ. 2021-07-25T22:42:31.71 0.1 undecidable manual S 338 30.9468 101 -0.19 92
GU.IMI.HHE. 2021-07-25T22:42:30.28 0.3 undecidable manual S 104 27.2505 102 -0.38 66
GU.MGRO.HHE. 2021-07-25T22:42:28.61 0.1 undecidable manual S 68 21.2676 105 0 97
GU.BURY.HHZ. 2021-07-25T22:42:28.22 0.1 undecidable manual S 181 20.868 105 -0.28 92
GU.STV.HHZ. 2021-07-25T22:42:28.57 0.1 undecidable manual P 328 35.742 99 0.33 88
GU.ENR.HHZ. 2021-07-25T22:42:27.63 0.1 undecidable manual P 338 30.9468 101 0.35 89
GU.IMI.HHE. 2021-07-25T22:42:26.52 0.1 undecidable manual P 104 27.2505 102 -0.05 95
GU.MGRO.HHE. 2021-07-25T22:42:25.63 0.1 undecidable manual P 68 21.2676 105 0.24 92
GU.BURY.HHZ. 2021-07-25T22:42:25.55 0.1 undecidable manual P 181 20.868 105 0.23 93
FR.SAOF.HHZ.00 2021-07-25T22:42:23.08 0.1 undecidable manual S 337 1.8981 162 -0.01 100
FR.SAOF.HHZ.00 2021-07-25T22:42:22.44 0.1 undecidable manual P 337 1.8981 162 0.24 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BURY.HNN. ML:1.0 0.00007593701 0.4992 AML other m 2021-07-25T22:42:29.09
GU.BURY.HHE. ML:0.4 0.000019771487 0.1792 AML other m 2021-07-25T22:42:29.25
GU.BURY.HNE. ML:1.1 0.000088594085 0.6912 AML other m 2021-07-25T22:42:31.81
GU.BURY.HHN. ML:0.5 0.000023002497 0.4096 AML other m 2021-07-25T22:42:31.51
GU.ENR.HHN. ML:0.5 0.00001669406 0.464 AML other m 2021-07-25T22:42:31.94
GU.ENR.HHE. ML:0.0 0.000006144638500000001 0.1408 AML other m 2021-07-25T22:42:32.83
GU.STV.HHE. ML:0.1 0.0000058432985 1.744 AML other m 2021-07-25T22:42:33.00
GU.STV.HHN. ML:0.1 0.000006577642 0.2464 AML other m 2021-07-25T22:42:33.24
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