Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of Md 1.2 on date 26-08-2020 and time 17:00:40 (Italy) in region 1 km S Zuccarello (SV)

A magnitude Md 1.2 (quarry blast) earthquake occured in region: 1 km S Zuccarello (SV), on

  • 26-08-2020 15:00:40 (UTC)
  • 26-08-2020 17:00:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1030, 8.1150 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
Zuccarello SV 1 309 309
Arnasco SV 3 645 954
Cisano sul Neva SV 3 2085 3039
Castelvecchio di Rocca Barbena SV 3 145 3184
Castelbianco SV 3 330 3514
Erli SV 4 245 3759
Vendone SV 4 388 4147
Balestrino SV 6 595 4742
Ortovero SV 6 1586 6328
Onzo SV 6 219 6547
Villanova d'Albenga SV 7 2657 9204
Nasino SV 7 207 9411
Garlenda SV 8 1254 10665
Toirano SV 8 2644 13309
Alto CN 9 128 13437
Aquila d'Arroscia IM 9 166 13603
Ranzo IM 9 557 14160
Boissano SV 9 2492 16652
Casanova Lerrone SV 9 749 17401
Ceriale SV 10 5561 22962
Albenga SV 10 24213 47175
Bardineto SV 10 756 47931
Borghetto Santo Spirito SV 10 4948 52879
Alassio SV 12 10934 63813
Borghetto d'Arroscia IM 12 456 64269
Loano SV 12 11407 75676
Stellanello SV 12 808 76484
Garessio CN 13 3244 79728
Testico SV 13 196 79924
Caprauna CN 13 104 80028
Giustenice SV 13 977 81005
Vessalico IM 14 282 81287
Pietra Ligure SV 15 8992 90279
Laigueglia SV 15 1810 92089
Calizzano SV 15 1475 93564
Magliolo SV 15 974 94538
Tovo San Giacomo SV 15 2582 97120
Villa Faraldi IM 15 444 97564
Cesio IM 15 283 97847
Armo IM 16 111 97958
Andora SV 16 7552 105510
Borgio Verezzi SV 17 2205 107715
Ormea CN 17 1617 109332
Pieve di Teco IM 17 1338 110670
Chiusanico IM 17 607 111277
Caravonica IM 17 282 111559
Priola CN 18 701 112260
Diano Arentino IM 18 722 112982
Chiusavecchia IM 18 577 113559
Rialto SV 18 564 114123
Calice Ligure SV 18 1730 115853
Lucinasco IM 19 272 116125
Diano San Pietro IM 19 1145 117270
San Bartolomeo al Mare IM 19 3129 120399
Borgomaro IM 20 865 121264
Cervo IM 20 1187 122451
Pornassio IM 20 685 123136
Pontedassio IM 20 2323 125459
Finale Ligure SV 20 11711 137170

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)
89 Km S of Asti (76202 inhabitants)
99 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 		Md 1.2 2020-08-26
15:00:40		 44.1028 8.1148 1 2020-11-19
12:37:06		 Bollettino Sismico Italiano INGV 84604281
Reviewed
Rev100 		Md 1.1 2020-08-26
15:00:39		 44.1087 8.1153 10 2020-08-26
15:08:59		 Sala Sismica INGV-Roma 82348671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-26 15:00:40 ± 0.09
Latitude 44.1028 ± 0.0054
Longitude 8.1148 ± 0.0075
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 84604281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 720
Semi-minor axis of confidence ellipse (meter) 410
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 320
Circular confidence region, given by single value of horizontal uncertainty (meter) 720.0
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 5
Number of defining phases 5
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.03597
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
Magnitudes information

Md:1.2

Field Value
Value 1.2
Uncertainty 0.0
Num. used stations 2
Type of magnitude Md
Reference to an origin 84604281
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-10 12:16:43

Md:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 4
Type of magnitude Md
Reference to an origin 82348671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-26 15:08:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.MGRO.HHZ. 2020-08-26T15:00:45.07 0.3 undecidable manual P 255 25.3524 91 -0.11 72
GU.GBOS.HHZ. 2020-08-26T15:00:45.36 0.3 undecidable manual P 305 26.751 91 -0.1 72
IV.IMI.HHZ. 2020-08-26T15:00:45.67 0.1 undecidable manual P 220 27.75 91 0.02 98
GU.CANO.HHZ. 2020-08-26T15:00:43.14 0.1 undecidable manual P 40 15.1737 92 0 100
GU.RORO.HHZ. 2020-08-26T15:00:41.04 0.1 undecidable manual P 285 3.996 97 0.13 99
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