Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 25-04-2021 and time 23:36:23 (Italy) in region Costa Ligure centro occidentale (Savona)

A magnitude ML 1.3 earthquake occured in region: Costa Ligure centro occidentale (Savona), on

  • 25-04-2021 21:36:23 (UTC)
  • 25-04-2021 23:36:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1850, 8.5380 at 9 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
Noli SV 10 2736 2736
Bergeggi SV 10 1129 3865
Spotorno SV 11 3803 7668
Vado Ligure SV 12 8336 16004
Savona SV 14 61345 77349
Vezzi Portio SV 15 809 78158
Finale Ligure SV 16 11711 89869
Quiliano SV 16 7232 97101
Albissola Marina SV 16 5487 102588
Albisola Superiore SV 17 10163 112751
Orco Feglino SV 17 890 113641
Celle Ligure SV 18 5237 118878
Borgio Verezzi SV 19 2205 121083
Calice Ligure SV 20 1730 122813
Varazze SV 20 13251 136064

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km SE of Savona (61345 inhabitants)
40 Km SW of Genova (586655 inhabitants)
73 Km NE of Sanremo (54807 inhabitants)
81 Km S of Alessandria (93943 inhabitants)
82 Km E of Cuneo (56081 inhabitants)
84 Km SE of Asti (76202 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 1.3 2021-04-25
21:36:23		 44.1853 8.5385 9 2021-07-12
16:55:10		 Bollettino Sismico Italiano INGV 90007741
Reviewed
Rev100 		ML 1.3 2021-04-25
21:36:23		 44.1862 8.5423 8 2021-04-25
22:08:56		 Sala Sismica INGV-Roma 89475311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-25 21:36:23 ± 0.17
Latitude 44.1853 ± 0.0090
Longitude 8.5385 ± 0.0075
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90007741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 916
Semi-minor axis of confidence ellipse (meter) 397
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 339
Circular confidence region, given by single value of horizontal uncertainty (meter) 920.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 142
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.19605
Epicentral distance of station farthest from the epicenter (degree) 1.15743
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 90007741
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-12 02:13:01

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 89475311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-25 22:08:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.BHB.HHZ. 2021-04-25T21:37:00.54 0.3 undecidable manual S 306 123.987 50 0.58 54
GU.STV.HHE. 2021-04-25T21:36:53.07 0.3 undecidable manual S 274 96.6255 50 0.43 60
GU.BURY.HHE. 2021-04-25T21:36:51.12 0.3 undecidable manual S 241 90.243 50 0.19 64
GU.ENR.HHZ. 2021-04-25T21:36:51.25 0.3 undecidable manual S 274 89.244 50 0.58 58
FR.SAOF.HHE.00 2021-04-25T21:36:48.77 0.3 undecidable manual S 255 81.5517 50 0.15 66
GU.BHB.HHZ. 2021-04-25T21:36:45.20 0.3 undecidable manual P 306 123.987 50 0.49 56
GU.EQUI.HHE. 2021-04-25T21:36:45.63 0.3 undecidable manual P 90 128.4714 50 0.24 59
GU.IMI.HHZ. 2021-04-25T21:36:42.14 0.3 undecidable manual S 240 59.7957 50 -0.67 60
IV.PLMA.HHE. 2021-04-25T21:36:41.77 0.3 undecidable manual P 98 105.8163 50 -0.13 63
GU.GBOS.HHZ. 2021-04-25T21:36:41.01 0.6 undecidable manual S 277 55.8996 50 -0.76 39
GU.BURY.HHE. 2021-04-25T21:36:40.09 0.3 undecidable manual P 241 90.243 50 0.6 58
GU.STV.HHE. 2021-04-25T21:36:40.38 0.3 undecidable manual P 274 96.6255 50 -0.1 65
GU.ENR.HHZ. 2021-04-25T21:36:39.84 0.3 undecidable manual P 274 89.244 50 0.5 60
FR.SAOF.HHE.00 2021-04-25T21:36:38.63 0.3 undecidable manual P 255 81.5517 50 0.46 62
GU.RNCA.HHE. 2021-04-25T21:36:38.72 0.6 undecidable manual S 46 45.621 50 -0.3 46
IV.MSSA.HHZ. 2021-04-25T21:36:38.01 0.3 undecidable manual P 79 79.1652 50 0.22 65
GU.GORR.HHE. 2021-04-25T21:36:37.83 0.3 undecidable manual P 52 75.8685 50 0.54 61
GU.PCP.HHE. 2021-04-25T21:36:36.92 0.3 undecidable manual S 1 39.5271 50 -0.47 67
GU.RORO.HHE. 2021-04-25T21:36:35.92 0.6 undecidable manual S 258 38.4282 50 -1.18 33
GU.IMI.HHZ. 2021-04-25T21:36:34.59 0.1 undecidable manual P 240 59.7957 50 -0.22 90
GU.GBOS.HHZ. 2021-04-25T21:36:34.16 0.1 undecidable manual P 277 55.8996 50 -0.05 94
GU.CANO.HHZ. 2021-04-25T21:36:32.46 0.3 undecidable manual S 276 24.0537 110 -0.32 71
GU.RNCA.HHE. 2021-04-25T21:36:32.13 0.3 undecidable manual P 46 45.621 50 -0.49 66
GU.RORO.HHE. 2021-04-25T21:36:31.02 0.1 undecidable manual P 258 38.4282 50 -0.49 89
IV.QLNO.HHZ. 2021-04-25T21:36:31.98 0.6 undecidable manual S 315 21.7671 112 -0.04 50
GU.PCP.HHE. 2021-04-25T21:36:31.44 0.3 undecidable manual P 1 39.5271 50 -0.24 70
IV.QLNO.HHZ. 2021-04-25T21:36:28.74 0.1 undecidable manual P 315 21.7671 112 0.17 98
GU.CANO.HHZ. 2021-04-25T21:36:28.98 0.1 undecidable manual P 276 24.0537 110 -0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHN. ML:1.5 0.00018099999999999998 0.24 AML other m 2021-04-25T21:36:32.99
GU.CANO.HHE. ML:1.3 0.0001185 0.44 AML other m 2021-04-25T21:36:33.54
GU.GBOS.HHE. ML:1.1 0.000031100000000000004 0.5 AML other m 2021-04-25T21:36:42.93
GU.GBOS.HHN. ML:1.1 0.00003135 0.54 AML other m 2021-04-25T21:36:42.49
GU.IMI.HHN. ML:1.2 0.00003705 0.52 AML other m 2021-04-25T21:36:45.69
GU.IMI.HHE. ML:1.2 0.0000305 0.16 AML other m 2021-04-25T21:36:45.75
GU.ENR.HHE. ML:1.3 0.000025849999999999998 0.5 AML other m 2021-04-25T21:36:51.32
GU.ENR.HHN. ML:1.5 0.000042300000000000005 0.64 AML other m 2021-04-25T21:36:52.68
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