Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 0.5 on date 29-09-2021 and time 15:01:40 (UTC) in region 1 km N Cisano sul Neva (SV)

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

  • 29-09-2021 15:01:40 (UTC)
  • 29-09-2021 17:01:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1010, 8.1450 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 1 2085 2085
Zuccarello SV 3 309 2394
Balestrino SV 4 595 2989
Arnasco SV 4 645 3634
Castelvecchio di Rocca Barbena SV 4 145 3779
Erli SV 5 245 4024
Castelbianco SV 6 330 4354
Toirano SV 6 2644 6998
Villanova d'Albenga SV 6 2657 9655
Vendone SV 6 388 10043
Ortovero SV 7 1586 11629
Ceriale SV 7 5561 17190
Boissano SV 7 2492 19682
Albenga SV 8 24213 43895
Borghetto Santo Spirito SV 8 4948 48843
Onzo SV 8 219 49062
Garlenda SV 8 1254 50316
Nasino SV 9 207 50523
Loano SV 10 11407 61930
Bardineto SV 10 756 62686
Alassio SV 10 10934 73620
Casanova Lerrone SV 11 749 74369
Aquila d'Arroscia IM 11 166 74535
Alto CN 11 128 74663
Ranzo IM 11 557 75220
Giustenice SV 12 977 76197
Pietra Ligure SV 12 8992 85189
Stellanello SV 13 808 85997
Tovo San Giacomo SV 13 2582 88579
Magliolo SV 13 974 89553
Borghetto d'Arroscia IM 14 456 90009
Testico SV 14 196 90205
Laigueglia SV 14 1810 92015
Garessio CN 14 3244 95259
Borgio Verezzi SV 14 2205 97464
Calizzano SV 15 1475 98939
Caprauna CN 15 104 99043
Villa Faraldi IM 15 444 99487
Andora SV 16 7552 107039
Vessalico IM 16 282 107321
Calice Ligure SV 17 1730 109051
Rialto SV 17 564 109615
Cesio IM 17 283 109898
Finale Ligure SV 18 11711 121609
Armo IM 18 111 121720
Chiusanico IM 19 607 122327
Diano Arentino IM 19 722 123049
Priola CN 19 701 123750
Caravonica IM 19 282 124032
Pieve di Teco IM 19 1338 125370
San Bartolomeo al Mare IM 19 3129 128499
Ormea CN 19 1617 130116
Cervo IM 20 1187 131303
Chiusavecchia IM 20 577 131880
Orco Feglino SV 20 890 132770
Diano San Pietro IM 20 1145 133915

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km SW of Savona (61345 inhabitants)
42 Km NE of Sanremo (54807 inhabitants)
57 Km SE of Cuneo (56081 inhabitants)
72 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
Bulletin
Rev1000 		ML 0.5 2021-09-29
15:01:40		 44.1007 8.1453 1 2022-03-30
13:04:38		 Bollettino Sismico Italiano INGV 101107781
Reviewed
Rev100 		ML 0.5 2021-09-29
15:01:40		 44.1082 8.1167 6 2021-09-29
15:12:08		 Sala Sismica INGV-Roma 96034391
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-29 15:01:40 ± 0.42
Latitude 44.1007 ± 0.0270
Longitude 8.1453 ± 0.0313
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 101107781

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 3550
Semi-minor axis of confidence ellipse (meter) 1530
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 323
Circular confidence region, given by single value of horizontal uncertainty (meter) 3550.0
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 31
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.54
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.52520
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 96034391
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-29 15:12:08

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 101107781
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-18 10:55:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PP3.EHZ. 2021-09-29T15:03:26.67 3.0 undecidable manual Sn -0.91 0
IV.CING.HHZ. 2021-09-29T15:03:26.67 3.0 undecidable manual Sg 6.23 0
IV.RM33.EHZ. 2021-09-29T15:03:25.99 3.0 undecidable manual Sn -2.41 0
IV.MGR.HHZ. 2021-09-29T15:03:25.53 3.0 undecidable manual Pn 7.25 0
IV.ILOS.HHZ. 2021-09-29T15:03:24.08 3.0 undecidable manual Pn -6.22 0
IV.ASSB.HHZ. 2021-09-29T15:03:23.66 3.0 undecidable manual Sg 9.79 0
IX.NSC3.EHZ.02 2021-09-29T15:03:21.17 3.0 undecidable manual Pg 12.44 0
IV.CRAC.EHZ. 2021-09-29T15:03:19.17 3.0 positive manual Pn -4.51 0
IV.CRTC.HHZ. 2021-09-29T15:03:17.56 3.0 undecidable manual Sn 4.58 0
IV.ARVD.HHZ. 2021-09-29T15:03:15.15 3.0 undecidable manual Sn -0.17 0
IV.APEC.HHZ. 2021-09-29T15:03:01.34 3.0 undecidable manual Sn -4.61 0
IV.POFI.HNZ. 2021-09-29T15:03:01.13 3.0 undecidable manual Pg 11.25 0
IV.VENT.EHZ. 2021-09-29T15:02:54.48 3.0 undecidable manual Pn -1.01 0
MN.TRI.HHZ. 2021-09-29T15:02:51.71 3.0 negative manual Pg 9.14 0
IV.LMD.HHZ. 2021-09-29T15:02:49.29 3.0 undecidable manual Sn -2.17 0
IV.PESA.HHZ. 2021-09-29T15:02:41.11 3.0 undecidable manual Pg 10.55 0
IV.FOSV.EHZ. 2021-09-29T15:02:40.28 3.0 undecidable manual Pg 8.67 0
IV.PE3.EHZ. 2021-09-29T15:02:32.10 3.0 positive manual Pg 4.41 0
GU.LSD.HHZ. 2021-09-29T15:02:28.23 3.0 undecidable manual Sn 0.23 0
MN.BNI.HHZ. 2021-09-29T15:02:27.82 3.0 undecidable manual S 1.47 0
IV.BRSN.HNZ. 2021-09-29T15:02:19.52 3.0 undecidable manual Pn -3.27 0
IV.ZEN8.EHZ. 2021-09-29T15:02:18.91 3.0 undecidable manual Pg 2.68 0
IV.SARZ.HNZ. 2021-09-29T15:02:06.42 3.0 undecidable manual S -1.4 0
CH.MUGIO.HHZ. 2021-09-29T15:02:05.56 3.0 negative manual Pn -4.47 0
GU.LSD.HHZ. 2021-09-29T15:02:03.58 3.0 undecidable manual P -2.45 0
GU.PCP.HHZ. 2021-09-29T15:01:51.32 0.1 undecidable manual P 33 58.2972 90 -0.72 79
GU.IMI.HHZ. 2021-09-29T15:01:46.18 0.3 undecidable manual P 224 29.1486 91 -0.02 75
GU.GBOS.HHZ. 2021-09-29T15:01:45.95 0.1 undecidable manual P 303 28.8489 91 -0.2 97
GU.MGRO.HHE. 2021-09-29T15:01:45.84 0.1 undecidable manual P 257 27.6501 91 -0.06 100
GU.CANO.HHZ. 2021-09-29T15:01:43.85 0.1 undecidable manual P 32 13.9749 92 0.69 86
GU.RORO.HHZ. 2021-09-29T15:01:41.90 0.1 undecidable manual P 282 6.3936 94 0.25 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GBOS.HHE. ML:0.3 0.000008680953 0.2944 AML other m 2021-09-29T15:01:49.73
GU.GBOS.HHN. ML:0.3 0.0000090196575 0.128 AML other m 2021-09-29T15:01:50.22
GU.IMI.HHE. ML:0.8 0.0000293001 0.128 AML other m 2021-09-29T15:01:50.71
GU.IMI.HHN. ML:0.8 0.000030844495 0.2048 AML other m 2021-09-29T15:01:50.73
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