Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 28-05-2021 and time 23:34:17 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude ML 1.2 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 28-05-2021 21:34:17 (UTC)
  • 28-05-2021 23:34:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6650, 7.6130 at 14 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.

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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
Bordighera IM 14 10469 10469
Ventimiglia IM 14 24310 34779
Vallecrosia IM 15 6956 41735
Camporosso IM 17 5632 47367
Vallebona IM 17 1310 48677
Ospedaletti IM 17 3367 52044
San Biagio della Cima IM 18 1329 53373
Soldano IM 18 977 54350
Seborga IM 19 315 54665

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SW of Sanremo (54807 inhabitants)
81 Km S of Cuneo (56081 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 1.2 2021-05-28
21:34:17		 43.665 7.6128 14 2021-12-29
11:12:17		 Bollettino Sismico Italiano INGV 93581381
Reviewed
Rev100 		ML 1.2 2021-05-28
21:34:17		 43.6613 7.6085 14 2021-05-28
21:44:44		 Sala Sismica INGV-Roma 90581121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-28 21:34:17 ± 0.12
Latitude 43.6650 ± 0.0054
Longitude 7.6128 ± 0.0062
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 93581381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 658
Semi-minor axis of confidence ellipse (meter) 117
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 204
Circular confidence region, given by single value of horizontal uncertainty (meter) 660.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 298
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.91371
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 93581381
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-08-02 23:32:40

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 90581121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-28 21:44:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RMP.HHE. 2021-05-28T21:36:01.46 3.0 undecidable manual Sn -3.67 0
IV.PE3.EHN. 2021-05-28T21:35:56.46 3.0 undecidable manual Sn -0.64 0
IV.IACL.HHN. 2021-05-28T21:35:51.48 3.0 negative manual Pn 1.76 0
IV.FIR.HHZ. 2021-05-28T21:35:37.88 3.0 undecidable manual Sg 2.16 0
IV.GUAR.HHE. 2021-05-28T21:35:26.72 3.0 undecidable manual Pg 8.93 0
IV.APEC.HHZ. 2021-05-28T21:35:18.35 3.0 positive manual Pg 12.09 0
IV.RMP.HHN. 2021-05-28T21:35:07.56 3.0 negative manual Pn -4.19 0
IV.FIR.HHN. 2021-05-28T21:34:52.10 3.0 undecidable manual Pn -3.13 0
GU.PZZ.HHE. 2021-05-28T21:34:46.62 0.6 undecidable manual S 337 101.4207 92 -0.09 43
GU.CANO.HHZ. 2021-05-28T21:34:40.59 0.6 undecidable manual S 39 78.1662 92 0.09 45
GU.GBOS.HHE. 2021-05-28T21:34:37.70 0.6 undecidable manual S 16 66.4779 93 0.31 44
GU.STV.HHE. 2021-05-28T21:34:37.70 0.6 undecidable manual S 341 68.2761 93 -0.17 45
GU.ENR.HHZ. 2021-05-28T21:34:36.65 0.6 undecidable manual S 346 64.491 93 -0.22 45
GU.RORO.HHE. 2021-05-28T21:34:35.80 0.6 undecidable manual S 36 61.494 93 -0.26 44
GU.PZZ.HHE. 2021-05-28T21:34:34.36 0.1 undecidable manual P 337 101.4207 92 0.14 83
IV.QLNO.HHE. 2021-05-28T21:34:33.06 0.1 undecidable manual P 38 93.6396 92 0.03 87
GU.CANO.HHZ. 2021-05-28T21:34:30.39 0.6 undecidable manual P 39 78.1662 92 -0.25 43
GU.STV.HHE. 2021-05-28T21:34:29.11 0.1 undecidable manual P 341 68.2761 93 -0.01 92
FR.SAOF.HHZ.00 2021-05-28T21:34:29.15 0.6 undecidable manual S 352 35.9418 96 -0.11 48
GU.IMI.HHZ. 2021-05-28T21:34:29.31 0.6 undecidable manual S 39 35.3424 96 0.23 47
GU.ENR.HHZ. 2021-05-28T21:34:28.73 0.1 positive manual P 346 64.491 93 0.19 89
GU.GBOS.HHE. 2021-05-28T21:34:28.86 0.1 undecidable manual P 16 66.4779 93 0.01 92
GU.RORO.HHE. 2021-05-28T21:34:27.97 0.1 undecidable manual P 36 61.494 93 -0.11 90
GU.IMI.HHZ. 2021-05-28T21:34:24.21 0.6 negative manual P 39 35.3424 96 0.16 48
FR.SAOF.HHZ.00 2021-05-28T21:34:24.12 1.0 undecidable manual P 352 35.9418 96 -0.03 24
GU.BURY.HHE. 2021-05-28T21:34:23.60 0.6 undecidable manual S 341 13.7751 121 0.05 50
GU.BURY.HHE. 2021-05-28T21:34:20.75 0.1 undecidable manual P 341 13.7751 121 -0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
FR.SAOF.HHE.00 ML:1.4 0.00008395 0.06 AML other m 2021-05-28T21:34:29.41
FR.SAOF.HHN.00 ML:1.1 0.000052 0.3 AML other m 2021-05-28T21:34:29.31
GU.IMI.HHE. ML:1.0 0.0000407 0.3 AML other m 2021-05-28T21:34:29.47
GU.IMI.HHN. ML:1.0 0.00004055 0.52 AML other m 2021-05-28T21:34:30.57
GU.ENR.HHE. ML:1.5 0.00005555 0.16 AML other m 2021-05-28T21:34:37.15
GU.ENR.HHN. ML:1.5 0.000059749999999999995 0.24 AML other m 2021-05-28T21:34:37.06
GU.CANO.HHN. ML:1.2 0.000023821904999999997 1.7696 AML other m 2021-05-28T21:34:42.09
GU.CANO.HHE. ML:1.2 0.00002043863 1.3952 AML other m 2021-05-28T21:34:42.26
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