Earthquake (quarry blast) with magnitude of ML 0.9 on date 17-11-2021 and time 11:16:19 (Italy) in region 1 km NE Arnasco (SV)

A magnitude ML 0.9 (quarry blast) earthquake occured in region: 1 km NE Arnasco (SV), on

  • 17-11-2021 10:16:19 (UTC)
  • 17-11-2021 11:16:19 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.089, 8.118 at 0 km depth.

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

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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Arnasco SV 1 645 645
Cisano sul Neva SV 2 2085 2730
Zuccarello SV 3 309 3039
Vendone SV 4 388 3427
Ortovero SV 4 1586 5013
Castelbianco SV 4 330 5343
Castelvecchio di Rocca Barbena SV 5 145 5488
Villanova d'Albenga SV 5 2657 8145
Erli SV 6 245 8390
Onzo SV 6 219 8609
Garlenda SV 6 1254 9863
Balestrino SV 6 595 10458
Nasino SV 8 207 10665
Casanova Lerrone SV 8 749 11414
Toirano SV 8 2644 14058
Ranzo IM 9 557 14615
Albenga SV 9 24213 38828
Aquila d'Arroscia IM 9 166 38994
Alto CN 9 128 39122
Ceriale SV 9 5561 44683
Boissano SV 10 2492 47175
Alassio SV 10 10934 58109
Borghetto Santo Spirito SV 11 4948 63057
Stellanello SV 11 808 63865
Borghetto d'Arroscia IM 11 456 64321
Testico SV 11 196 64517
Bardineto SV 12 756 65273
Loano SV 12 11407 76680
Laigueglia SV 13 1810 78490
Vessalico IM 13 282 78772
Caprauna CN 13 104 78876
Villa Faraldi IM 14 444 79320
Garessio CN 14 3244 82564
Giustenice SV 14 977 83541
Cesio IM 14 283 83824
Andora SV 15 7552 91376
Pietra Ligure SV 15 8992 100368
Tovo San Giacomo SV 16 2582 102950
Magliolo SV 16 974 103924
Chiusanico IM 16 607 104531
Armo IM 16 111 104642
Calizzano SV 16 1475 106117
Caravonica IM 17 282 106399
Diano Arentino IM 17 722 107121
Pieve di Teco IM 17 1338 108459
Borgio Verezzi SV 17 2205 110664
Chiusavecchia IM 17 577 111241
San Bartolomeo al Mare IM 18 3129 114370
Diano San Pietro IM 18 1145 115515
Ormea CN 18 1617 117132
Cervo IM 18 1187 118319
Lucinasco IM 18 272 118591
Pontedassio IM 18 2323 120914
Borgomaro IM 19 865 121779
Diano Castello IM 19 2214 123993
Priola CN 19 701 124694
Rialto SV 19 564 125258
Calice Ligure SV 19 1730 126988
Aurigo IM 19 347 127335
Pornassio IM 20 685 128020
Diano Marina IM 20 5977 133997

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km SW of Savona (61345 inhabitants)
40 Km NE of Sanremo (54807 inhabitants)
56 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
Reviewed
Rev100
ML 0.9 2021-11-17
10:16:19
44.0887 8.1177 1 2021-11-17
10:21:52
Sala Sismica INGV-Roma 97515471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-17 10:16:19 ± 0.15
Latitude 44.0887 ± 0.0090
Longitude 8.1177 ± 0.0113
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type quarry blast
Origin ID 97515471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1170
Semi-minor axis of confidence ellipse (meter) 680
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) 1170
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 186
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
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) 0.04407
Epicentral distance of station farthest from the epicenter (degree) 0.54589
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 2
Type of magnitude ML
Reference to an origin 97515471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-17 10:21:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.PCP.HHZ. 2021-11-17T10:16:31.08 0.6 undecidable manual P 34 0.5459 50 -0.26 45
GU.IMI.HHZ. 2021-11-17T10:16:24.57 0.3 undecidable manual P 222 0.2401 91 0.01 75
GU.GBOS.HHZ. 2021-11-17T10:16:24.55 0.3 undecidable manual P 308 0.2509 91 -0.25 71
GU.MGRO.HHZ. 2021-11-17T10:16:24.26 0.3 undecidable manual P 258 0.2266 91 0 75
GU.CANO.HHZ. 2021-11-17T10:16:22.62 0.3 undecidable manual P 36 0.1466 92 0.14 74
GU.RORO.HHZ. 2021-11-17T10:16:20.38 0.1 undecidable manual P 303 0.0441 96 0.18 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHN. ML:0.8 6.075E-5 0.42 AML other m 2021-11-17T10:16:24.59
GU.CANO.HHE. ML:1.1 0.000152 0.98 AML other m 2021-11-17T10:16:28.45
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