Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 0.5 on date 07-04-2023 and time 12:15:51 (Italy) in region 1 km W Cisano sul Neva (SV)

A magnitude ML 0.5 (quarry blast) earthquake occured in region: 1 km W Cisano sul Neva (SV), on

  • 07-04-2023 10:15:51 (UTC)
  • 07-04-2023 12:15:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0870, 8.1280 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: quarry blast.

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
Cisano sul Neva SV 2 2085 2085
Arnasco SV 2 645 2730
Zuccarello SV 3 309 3039
Vendone SV 4 388 3427
Ortovero SV 5 1586 5013
Villanova d'Albenga SV 5 2657 7670
Castelvecchio di Rocca Barbena SV 5 145 7815
Castelbianco SV 5 330 8145
Balestrino SV 6 595 8740
Erli SV 6 245 8985
Garlenda SV 6 1254 10239
Onzo SV 6 219 10458
Toirano SV 8 2644 13102
Albenga SV 8 24213 37315
Ceriale SV 9 5561 42876
Nasino SV 9 207 43083
Casanova Lerrone SV 9 749 43832
Boissano SV 9 2492 46324
Alassio SV 9 10934 57258
Ranzo IM 9 557 57815
Aquila d'Arroscia IM 10 166 57981
Borghetto Santo Spirito SV 10 4948 62929
Alto CN 10 128 63057
Stellanello SV 11 808 63865
Loano SV 12 11407 75272
Testico SV 12 196 75468
Bardineto SV 12 756 76224
Borghetto d'Arroscia IM 12 456 76680
Laigueglia SV 13 1810 78490
Villa Faraldi IM 14 444 78934
Giustenice SV 14 977 79911
Vessalico IM 14 282 80193
Caprauna CN 14 104 80297
Andora SV 14 7552 87849
Pietra Ligure SV 14 8992 96841
Garessio CN 15 3244 100085
Cesio IM 15 283 100368
Tovo San Giacomo SV 15 2582 102950
Magliolo SV 15 974 103924
Borgio Verezzi SV 16 2205 106129
Chiusanico IM 17 607 106736
Calizzano SV 17 1475 108211
Diano Arentino IM 17 722 108933
Caravonica IM 17 282 109215
Armo IM 17 111 109326
Chiusavecchia IM 17 577 109903
Pieve di Teco IM 17 1338 111241
San Bartolomeo al Mare IM 18 3129 114370
Diano San Pietro IM 18 1145 115515
Cervo IM 18 1187 116702
Pontedassio IM 19 2323 119025
Lucinasco IM 19 272 119297
Diano Castello IM 19 2214 121511
Ormea CN 19 1617 123128
Calice Ligure SV 19 1730 124858
Rialto SV 19 564 125422
Borgomaro IM 19 865 126287
Finale Ligure SV 20 11711 137998
Priola CN 20 701 138699
Diano Marina IM 20 5977 144676
Aurigo IM 20 347 145023

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km SW of Savona (61345 inhabitants)
40 Km NE of Sanremo (54807 inhabitants)
57 Km SE of Cuneo (56081 inhabitants)
74 Km W of Genova (586655 inhabitants)
91 Km S of Asti (76202 inhabitants)
100 Km SW 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 0.5 2023-04-07
10:15:51		 44.0867 8.1277 1 2024-03-01
17:18:04		 Bollettino Sismico Italiano INGV 116512461
Reviewed
Rev100 		ML 0.6 2023-04-07
10:15:51		 44.0985 8.1032 4 2023-04-07
10:24:35		 Sala Sismica INGV-Roma 116136691
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-07 10:15:51 ± 0.26
Latitude 44.0867 ± 0.0162
Longitude 8.1277 ± 0.0188
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type quarry blast
Origin ID 116512461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2100
Semi-minor axis of confidence ellipse (meter) 1000
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 322
Circular confidence region, given by single value of horizontal uncertainty (meter) 2100.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 191
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.05036
Epicentral distance of station farthest from the epicenter (degree) 0.54409
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 116512461
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-01-18 10:10:18

ML:0.6

Field Value
Value 0.6
Uncertainty 0.1
Num. used stations 5
Type of magnitude ML
Reference to an origin 116136691
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-07 10:24:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.PCP.HHN. 2023-04-07T10:16:02.61 0.6 undecidable manual P 33 60.3951 50 -0.85 37
FR.SAOF.HHE.00 2023-04-07T10:16:00.46 0.6 undecidable manual P 256 47.2194 91 -0.38 45
GU.IMI.HHZ. 2023-04-07T10:15:57.01 0.3 undecidable manual P 224 27.0507 91 0.2 72
IV.QLNO.HHE. 2023-04-07T10:15:57.62 0.6 undecidable manual P 33 31.5462 91 -0.09 49
GU.MGRO.HHZ. 2023-04-07T10:15:56.54 0.1 undecidable manual P 259 25.9518 91 -0.04 100
GU.GBOS.HHZ. 2023-04-07T10:15:56.89 0.3 undecidable manual P 307 28.6491 91 -0.23 72
GU.CANO.HHZ. 2023-04-07T10:15:55.02 0.3 undecidable manual P 33 15.9729 92 0.43 70
GU.RORO.HHZ. 2023-04-07T10:15:52.81 0.1 undecidable manual P 301 5.5944 95 0.29 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHE. ML:0.7 0.000048871730000000004 0.64 AML other m 2023-04-07T10:15:57.53
GU.CANO.HHN. ML:0.4 0.000028222385 0.4992 AML other m 2023-04-07T10:15:57.69
GU.GBOS.HHE. ML:0.3 0.000012369728499999999 1.3952 AML other m 2023-04-07T10:16:00.96
GU.IMI.HHE. ML:0.5 0.00002231969 2.7008 AML other m 2023-04-07T10:16:01.82
GU.MGRO.HHN. ML:0.6 0.000026767675000000003 1.1392 AML other m 2023-04-07T10:16:01.77
GU.MGRO.HHE. ML:0.6 0.0000273 0.84 AML other m 2023-04-07T10:16:01.30
GU.IMI.HHN. ML:0.7 0.000031086965 1.0624 AML other m 2023-04-07T10:16:01.92
GU.GBOS.HHN. ML:0.4 0.00001490143 2.0992 AML other m 2023-04-07T10:16:00.38
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