Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 23-02-2018 and time 11:28:30 (Italy) in region 4 km NE Vezzi Portio (SV)

A magnitude ML 1.3 earthquake occured in region: 4 km NE Vezzi Portio (SV), on

  • 23-02-2018 10:28:30 (UTC)
  • 23-02-2018 11:28:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.2560, 8.3930 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
Vezzi Portio SV 4 809 809
Spotorno SV 4 3803 4612
Vado Ligure SV 4 8336 12948
Bergeggi SV 4 1129 14077
Quiliano SV 5 7232 21309
Noli SV 6 2736 24045
Orco Feglino SV 7 890 24935
Mallare SV 9 1146 26081
Savona SV 9 61345 87426
Calice Ligure SV 10 1730 89156
Altare SV 10 2108 91264
Rialto SV 10 564 91828
Finale Ligure SV 10 11711 103539
Albissola Marina SV 12 5487 109026
Pallare SV 12 923 109949
Borgio Verezzi SV 13 2205 112154
Bormida SV 13 387 112541
Tovo San Giacomo SV 13 2582 115123
Albisola Superiore SV 13 10163 125286
Magliolo SV 13 974 126260
Carcare SV 14 5587 131847
Pietra Ligure SV 15 8992 140839
Giustenice SV 15 977 141816
Osiglia SV 16 444 142260
Celle Ligure SV 16 5237 147497
Plodio SV 16 650 148147
Loano SV 18 11407 159554
Stella SV 18 3009 162563
Cosseria SV 18 1105 163668
Cairo Montenotte SV 19 13269 176937
Varazze SV 19 13251 190188
Boissano SV 19 2492 192680
Millesimo SV 19 3383 196063
Murialdo SV 20 841 196904
Borghetto Santo Spirito SV 20 4948 201852
Roccavignale SV 20 752 202604

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km SW of Savona (61345 inhabitants)
46 Km W of Genova (586655 inhabitants)
68 Km NE of Sanremo (54807 inhabitants)
69 Km E of Cuneo (56081 inhabitants)
73 Km S of Asti (76202 inhabitants)
75 Km S of Alessandria (93943 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 2018-02-23
10:28:30		 44.256 8.3928 9 2019-04-24
14:49:19		 Bollettino Sismico Italiano INGV 54240991
Reviewed
Rev100 		ML 2.1 2018-02-23
10:28:22		 44.0292 9.0182 10 2018-02-23
10:42:44		 Sala Sismica INGV-Roma 54108221
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-02-23 10:28:30 ± 0.2
Latitude 44.2560 ± 0.0117
Longitude 8.3928 ± 0.0151
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 54240991

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1555
Semi-minor axis of confidence ellipse (meter) 751
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 319
Circular confidence region, given by single value of horizontal uncertainty (meter) 1550.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 165
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.76352
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 54240991
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-02-14 10:41:36

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 54108221
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-02-23 10:42:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MILZ.HHZ. 2018-02-23T10:30:13.49 3.0 undecidable manual Pn 4.25 0
IV.SLCN.HHZ. 2018-02-23T10:30:12.74 3.0 negative manual Pg 21.5 0
IV.MMO1.EHZ. 2018-02-23T10:30:06.34 3.0 undecidable manual Sg 13.67 0
IV.T1214.HNZ. 2018-02-23T10:29:57.86 3.0 undecidable manual Sn 5.8 0
OX.AGOR.HHZ. 2018-02-23T10:29:50.18 3.0 undecidable manual Sn 5.02 0
IV.PAOL.HNZ. 2018-02-23T10:29:49.17 3.0 undecidable manual Pg 12.15 0
IV.MODR.HHZ. 2018-02-23T10:29:48.25 3.0 undecidable manual Pg 17.780001 0
IV.SMA1.EHZ. 2018-02-23T10:29:23.25 3.0 undecidable manual Pg 8.72 0
IV.LAV9.HHZ. 2018-02-23T10:29:17.89 3.0 negative manual Pn 1.4 0
IV.RIBO.EHZ.01 2018-02-23T10:29:12.29 3.0 undecidable manual Sn -3.75 0
IV.NDIM.HHZ. 2018-02-23T10:29:10.89 3.0 undecidable manual Sn 1.55 0
IV.SBPO.HNZ. 2018-02-23T10:29:10.40 3.0 undecidable manual S -9.99 0
IV.SRES.HHZ. 2018-02-23T10:29:08.43 3.0 undecidable manual Pn -1.68 0
GU.STV.HHN. 2018-02-23T10:28:56.08 0.3 undecidable manual S 270 84.7485 50 0.35 62
IV.SEI.HHZ. 2018-02-23T10:28:54.11 3.0 undecidable manual P -9.99 0
IV.SBPO.HNZ. 2018-02-23T10:28:49.86 3.0 positive manual P -9.99 0
GU.STV.HHN. 2018-02-23T10:28:45.96 1.0 undecidable manual P 270 84.7485 50 1.01 16
GU.GORR.HHN. 2018-02-23T10:28:44.84 0.6 positive manual P 61 81.252 50 0.44 41
GU.GBOS.HHZ. 2018-02-23T10:28:44.90 0.3 undecidable manual S 268 44.0226 50 0.07 71
GU.RORO.HHE. 2018-02-23T10:28:40.50 0.3 undecidable manual S 239 30.5472 50 -0.74 60
IV.IMI.HHN. 2018-02-23T10:28:40.50 0.6 undecidable manual P 226 55.3002 50 0.09 46
GU.GBOS.HHZ. 2018-02-23T10:28:38.77 0.1 undecidable manual P 268 44.0226 50 0.1 93
IV.GROG.HHZ. 2018-02-23T10:28:38.42 3.0 undecidable manual P -9.99 0
GU.CANO.HHZ. 2018-02-23T10:28:36.00 0.3 undecidable manual S 247 13.4754 125 0.08 74
GU.RORO.HHE. 2018-02-23T10:28:36.47 0.1 undecidable manual P 239 30.5472 50 -0.12 95
GU.PCP.HHN. 2018-02-23T10:28:36.80 0.3 undecidable manual P 21 33.8439 50 -0.31 68
IV.QLNO.HHZ. 2018-02-23T10:28:34.30 0.3 undecidable manual S 334 8.4804 138 -0.29 72
GU.CANO.HHZ. 2018-02-23T10:28:33.62 0.1 positive manual P 247 13.4754 125 0.1 99
IV.QLNO.HHZ. 2018-02-23T10:28:32.83 0.1 positive manual P 334 8.4804 138 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.QLNO.HHN. ML:1.1 0.00017999999999999998 0.88 AML other m 2018-02-23T10:28:35.82
GU.CANO.HHE. ML:1.7 0.0005275000000000001 0.3 AML other m 2018-02-23T10:28:36.59
IV.QLNO.HHE. ML:1.1 0.000168 1.18 AML other m 2018-02-23T10:28:36.85
GU.CANO.HHN. ML:1.4 0.00026700000000000004 1.18 AML other m 2018-02-23T10:28:37.70
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
Waveforms Seismic signals in miniseed + resp format Download