Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 30-03-2021 and time 06:36:25 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude ML 1.5 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 30-03-2021 04:36:25 (UTC)
  • 30-03-2021 06:36:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.9570, 7.5620 at 12 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
Rocchetta Nervina IM 8 298 298
Pigna IM 9 859 1157
Olivetta San Michele IM 9 211 1368
Airole IM 9 407 1775
Castel Vittorio IM 10 287 2062
Isolabona IM 11 679 2741
Apricale IM 12 629 3370
Dolceacqua IM 13 2074 5444
Perinaldo IM 14 870 6314
Bajardo IM 14 312 6626
Soldano IM 16 977 7603
Triora IM 17 355 7958
Camporosso IM 17 5632 13590
San Biagio della Cima IM 17 1329 14919
Molini di Triora IM 18 617 15536
Seborga IM 18 315 15851
Vallebona IM 18 1310 17161
Ceriana IM 19 1250 18411
Ventimiglia IM 19 24310 42721
Vallecrosia IM 19 6956 49677

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NW of Sanremo (54807 inhabitants)
49 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 1.5 2021-03-30
04:36:25		 43.9572 7.5618 12 2021-07-12
16:55:16		 Bollettino Sismico Italiano INGV 91792091
Reviewed
Rev100 		ML 1.6 2021-03-30
04:36:25		 43.9463 7.5858 10 2021-03-30
04:44:38		 Sala Sismica INGV-Roma 88605051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-30 04:36:25 ± 0.15
Latitude 43.9572 ± 0.0072
Longitude 7.5618 ± 0.0112
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91792091

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 780
Semi-minor axis of confidence ellipse (meter) 570
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 95
Circular confidence region, given by single value of horizontal uncertainty (meter) 780.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 149
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 19
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.90292
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 91792091
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-24 00:52:49

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 88605051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-30 04:44:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SBPO.HNZ. 2021-03-30T04:37:51.90 3.0 undecidable manual Sg 0.02 0
GU.BHB.HHZ. 2021-03-30T04:36:53.40 1.0 undecidable manual S 346 100.2219 91 -0.84 17
RD.PGF.BHZ. 2021-03-30T04:36:53.50 3.0 undecidable manual Pn 12.77 0
GU.CANO.HHZ. 2021-03-30T04:36:43.40 0.3 undecidable manual S 62 60.5949 91 -0.24 66
GU.BHB.HHZ. 2021-03-30T04:36:41.27 0.3 undecidable manual P 346 100.2219 91 -0.62 56
GU.RORO.HHE. 2021-03-30T04:36:39.00 0.3 undecidable manual S 67 43.8228 92 -0.17 70
IV.QLNO.HHZ. 2021-03-30T04:36:38.54 0.1 undecidable manual P 57 74.5698 91 0.62 78
GU.GBOS.HHZ. 2021-03-30T04:36:37.30 0.3 undecidable manual S 35 38.5281 92 -0.47 66
GU.PZZ.HHE. 2021-03-30T04:36:37.77 0.1 positive manual P 330 70.4739 91 0.47 83
GU.CANO.HHZ. 2021-03-30T04:36:36.22 0.3 undecidable manual P 62 60.5949 91 0.45 64
GU.ENR.HHZ. 2021-03-30T04:36:35.50 0.1 undecidable manual S 339 32.3454 93 -0.6 87
GU.IMI.HHZ. 2021-03-30T04:36:34.40 0.1 undecidable manual S 101 26.9508 93 -0.28 93
GU.RORO.HHE. 2021-03-30T04:36:33.54 0.1 positive manual P 67 43.8228 92 0.35 90
GU.GBOS.HHZ. 2021-03-30T04:36:32.78 0.1 positive manual P 35 38.5281 92 0.4 89
GU.STV.HHN. 2021-03-30T04:36:32.28 0.1 undecidable manual P 330 37.0296 92 0.13 94
GU.BURY.HHE. 2021-03-30T04:36:32.20 0.1 undecidable manual S 181 19.3695 97 -0.46 90
GU.ENR.HHZ. 2021-03-30T04:36:31.64 0.1 negative manual P 339 32.3454 93 0.22 93
GU.IMI.HHZ. 2021-03-30T04:36:30.79 0.1 positive manual P 101 26.9508 93 0.19 96
GU.BURY.HHE. 2021-03-30T04:36:29.38 0.1 negative manual P 181 19.3695 97 -0.05 99
FR.SAOF.HHZ.00 2021-03-30T04:36:29.00 0.1 undecidable manual S 347 3.2967 160 -0.23 100
FR.SAOF.HHZ.00 2021-03-30T04:36:27.59 0.1 undecidable manual P 347 3.2967 160 0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
FR.SAOF.HHN.00 ML:0.0 0.00073014935 0.0608 AML other m 2021-03-30T04:36:29.31
FR.SAOF.HHE.00 ML:0.0 0.0009752821000000001 0.0384 AML other m 2021-03-30T04:36:29.28
GU.IMI.HHE. ML:0.0 0.00025110215 0.08 AML other m 2021-03-30T04:36:34.73
GU.IMI.HHN. ML:0.0 0.00026858309999999995 0.0576 AML other m 2021-03-30T04:36:34.79
GU.ENR.HHN. ML:0.0 0.00017546105 0.0576 AML other m 2021-03-30T04:36:35.87
GU.ENR.HHE. ML:0.0 0.0002130281 0.0384 AML other m 2021-03-30T04:36:36.11
GU.GBOS.HHE. ML:0.0 0.000115 0.16 AML other m 2021-03-30T04:36:37.68
GU.GBOS.HHN. ML:0.0 0.00006379999999999999 0.12 AML other m 2021-03-30T04:36:38.02
GU.CANO.HHE. ML:0.0 0.000041292205000000005 0.3584 AML other m 2021-03-30T04:36:49.97
GU.CANO.HHN. ML:0.0 0.000039103075 0.2208 AML other m 2021-03-30T04:36:50.92
IV.QLNO.HHE. ML:1.4 0.000035345825 0.4416 AML other m 2021-03-30T04:36:52.31
IV.QLNO.HHN. ML:1.2 0.00002594438 0.2208 AML other m 2021-03-30T04:36:52.00
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