Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 22-03-2023 and time 16:05:12 (Italy) in region 1 km SW Zuccarello (SV)

A magnitude ML 0.5 earthquake occured in region: 1 km SW Zuccarello (SV), on

  • 22-03-2023 15:05:12 (UTC)
  • 22-03-2023 16:05:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1080, 8.1070 at 4 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
Castelbianco SV 3 330 639
Castelvecchio di Rocca Barbena SV 3 145 784
Arnasco SV 3 645 1429
Erli SV 3 245 1674
Cisano sul Neva SV 4 2085 3759
Vendone SV 4 388 4147
Balestrino SV 6 595 4742
Onzo SV 6 219 4961
Ortovero SV 6 1586 6547
Nasino SV 6 207 6754
Villanova d'Albenga SV 7 2657 9411
Garlenda SV 8 1254 10665
Alto CN 8 128 10793
Toirano SV 8 2644 13437
Aquila d'Arroscia IM 8 166 13603
Ranzo IM 9 557 14160
Casanova Lerrone SV 10 749 14909
Boissano SV 10 2492 17401
Bardineto SV 10 756 18157
Ceriale SV 10 5561 23718
Albenga SV 11 24213 47931
Borghetto Santo Spirito SV 11 4948 52879
Borghetto d'Arroscia IM 11 456 53335
Garessio CN 12 3244 56579
Caprauna CN 12 104 56683
Alassio SV 12 10934 67617
Stellanello SV 12 808 68425
Loano SV 13 11407 79832
Testico SV 13 196 80028
Vessalico IM 13 282 80310
Giustenice SV 13 977 81287
Calizzano SV 14 1475 82762
Pietra Ligure SV 15 8992 91754
Magliolo SV 15 974 92728
Tovo San Giacomo SV 15 2582 95310
Cesio IM 15 283 95593
Laigueglia SV 15 1810 97403
Armo IM 16 111 97514
Villa Faraldi IM 16 444 97958
Ormea CN 16 1617 99575
Pieve di Teco IM 17 1338 100913
Andora SV 17 7552 108465
Priola CN 17 701 109166
Borgio Verezzi SV 17 2205 111371
Caravonica IM 17 282 111653
Chiusanico IM 17 607 112260
Chiusavecchia IM 18 577 112837
Rialto SV 18 564 113401
Diano Arentino IM 18 722 114123
Calice Ligure SV 19 1730 115853
Lucinasco IM 19 272 116125
Pornassio IM 19 685 116810
Borgomaro IM 20 865 117675
Diano San Pietro IM 20 1145 118820
San Bartolomeo al Mare IM 20 3129 121949
Pontedassio IM 20 2323 124272

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)
74 Km W of Genova (586655 inhabitants)
88 Km S of Asti (76202 inhabitants)
98 Km SW of Alessandria (93943 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 0.5 2023-03-22
15:05:12		 44.1078 8.107 5 2023-03-22
15:19:05		 Sala Sismica INGV-Roma 115631061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-03-22 15:05:12 ± 0.15
Latitude 44.1078 ± 0.0063
Longitude 8.1070 ± 0.0088
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 115631061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 818
Semi-minor axis of confidence ellipse (meter) 313
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 141
Circular confidence region, given by single value of horizontal uncertainty (meter) 820.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 175
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.02968
Epicentral distance of station farthest from the epicenter (degree) 0.25001
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:0.5

Field Value
Value 0.5
Uncertainty 0.0
Num. used stations 4
Type of magnitude ML
Reference to an origin 115631061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-03-22 15:19:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.IMI.HHZ. 2023-03-22T15:05:21.58 0.6 undecidable manual S 218 0.2500 99 -0.39 46
GU.MGRO.HHZ. 2023-03-22T15:05:21.43 0.6 undecidable manual S 253 0.2239 100 0.44 46
GU.GBOS.HHZ. 2023-03-22T15:05:21.01 0.6 undecidable manual S 305 0.2338 100 -0.33 47
GU.MGRO.HHZ. 2023-03-22T15:05:17.35 1.0 undecidable manual P 253 0.2239 100 0.07 25
GU.GBOS.HHZ. 2023-03-22T15:05:17.58 0.6 undecidable manual P 305 0.2338 100 0.1 49
GU.CANO.HHZ. 2023-03-22T15:05:17.57 0.6 undecidable manual S 43 0.1367 106 -0.12 50
GU.IMI.HHZ. 2023-03-22T15:05:17.90 0.3 negative manual P 218 0.2500 99 0.05 74
GU.CANO.HHZ. 2023-03-22T15:05:15.50 0.1 undecidable manual P 43 0.1367 106 0.12 100
GU.RORO.HHZ. 2023-03-22T15:05:14.25 0.6 undecidable manual S 279 0.0297 144 0.12 51
GU.RORO.HHZ. 2023-03-22T15:05:12.94 1.0 undecidable manual P 279 0.0297 144 -0.38 24
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.RORO.HHE. ML:0.0 0.00024005834999999998 0.064 AML other m 2023-03-22T15:05:14.55
GU.RORO.HHN. ML:0.0 0.000262229865 0.0768 AML other m 2023-03-22T15:05:14.54
GU.CANO.HHE. ML:0.6 0.000039595215000000004 0.2816 AML other m 2023-03-22T15:05:17.82
GU.CANO.HHN. ML:0.5 0.000035096155 0.2176 AML other m 2023-03-22T15:05:18.36
GU.IMI.HHE. ML:0.6 0.0000189713665 0.2048 AML other m 2023-03-22T15:05:22.64
GU.IMI.HHN. ML:0.6 0.00002025241 0.3968 AML other m 2023-03-22T15:05:27.40
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download