Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 20-09-2023 and time 11:54:25 (Italy) in region 1 km S Zuccarello (SV)

A magnitude ML 1.1 earthquake occured in region: 1 km S Zuccarello (SV), on

  • 20-09-2023 09:54:25 (UTC)
  • 20-09-2023 11:54:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1050, 8.1180 at 5 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Zuccarello SV 1 309 309
Cisano sul Neva SV 3 2085 2394
Castelvecchio di Rocca Barbena SV 3 145 2539
Arnasco SV 3 645 3184
Castelbianco SV 4 330 3514
Erli SV 4 245 3759
Vendone SV 5 388 4147
Balestrino SV 5 595 4742
Ortovero SV 6 1586 6328
Onzo SV 7 219 6547
Villanova d'Albenga SV 7 2657 9204
Nasino SV 7 207 9411
Toirano SV 8 2644 12055
Garlenda SV 8 1254 13309
Alto CN 9 128 13437
Boissano SV 9 2492 15929
Aquila d'Arroscia IM 9 166 16095
Ceriale SV 9 5561 21656
Ranzo IM 10 557 22213
Casanova Lerrone SV 10 749 22962
Albenga SV 10 24213 47175
Bardineto SV 10 756 47931
Borghetto Santo Spirito SV 10 4948 52879
Alassio SV 12 10934 63813
Loano SV 12 11407 75220
Borghetto d'Arroscia IM 12 456 75676
Stellanello SV 12 808 76484
Garessio CN 13 3244 79728
Giustenice SV 13 977 80705
Testico SV 13 196 80901
Caprauna CN 13 104 81005
Vessalico IM 14 282 81287
Pietra Ligure SV 14 8992 90279
Magliolo SV 15 974 91253
Tovo San Giacomo SV 15 2582 93835
Calizzano SV 15 1475 95310
Laigueglia SV 15 1810 97120
Villa Faraldi IM 15 444 97564
Cesio IM 16 283 97847
Borgio Verezzi SV 16 2205 100052
Armo IM 16 111 100163
Andora SV 16 7552 107715
Ormea CN 17 1617 109332
Pieve di Teco IM 17 1338 110670
Priola CN 18 701 111371
Chiusanico IM 18 607 111978
Caravonica IM 18 282 112260
Rialto SV 18 564 112824
Calice Ligure SV 18 1730 114554
Diano Arentino IM 18 722 115276
Chiusavecchia IM 19 577 115853
Lucinasco IM 20 272 116125
Finale Ligure SV 20 11711 127836
San Bartolomeo al Mare IM 20 3129 130965
Diano San Pietro IM 20 1145 132110
Borgomaro IM 20 865 132975
Cervo IM 20 1187 134162
Pontedassio IM 20 2323 136485

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km SW of Savona (61345 inhabitants)
41 Km NE of Sanremo (54807 inhabitants)
55 Km SE of Cuneo (56081 inhabitants)
73 Km W of Genova (586655 inhabitants)
89 Km S of Asti (76202 inhabitants)
98 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
Reviewed
Rev100 		ML 1.1 2023-09-20
09:54:25		 44.1047 8.1178 5 2023-09-20
10:01:23		 Sala Sismica INGV-Roma 121270431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-20 09:54:25 ± 0.15
Latitude 44.1047 ± 0.0162
Longitude 8.1178 ± 0.0200
Depth (km) 5 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121270431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2335
Semi-minor axis of confidence ellipse (meter) 475
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) 2340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 180
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.03777
Epicentral distance of station farthest from the epicenter (degree) 0.53240
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 2
Type of magnitude ML
Reference to an origin 121270431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-20 10:01:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.PCP.HHE. 2023-09-20T09:54:36.89 1.0 undecidable manual P 35 59.0964 50 -0.25 30
GU.IMI.HHE. 2023-09-20T09:54:31.56 0.3 undecidable manual P 220 28.0497 101 -0.03 100
GU.MGRO.HHZ. 2023-09-20T09:54:31.27 0.3 undecidable manual P 255 25.6521 102 0.16 98
GU.CANO.HHZ. 2023-09-20T09:54:31.59 0.6 undecidable manual S 40 14.874 110 0.25 65
GU.CANO.HHZ. 2023-09-20T09:54:28.78 0.6 undecidable manual P 40 14.874 110 -0.25 65
GU.RORO.HHZ. 2023-09-20T09:54:28.01 0.6 undecidable manual S 282 4.1958 142 -0.2 67
GU.RORO.HHZ. 2023-09-20T09:54:27.35 0.6 undecidable manual P 282 4.1958 142 0.13 68
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHN. ML:0.8 0.00008080000000000001 0.28 AML other m 2023-09-20T09:54:32.07
GU.CANO.HHE. ML:1.3 0.000221 1.14 AML other m 2023-09-20T09:54:34.59
GU.RORO.HHE. ML:0.0 0.00023521249999999998 0.32 AML other m 2023-09-20T09:54:29.56
GU.RORO.HHN. ML:0.0 0.00021657605 0.1984 AML other m 2023-09-20T09:54:28.70
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