Earthquake (quarry blast) with magnitude of ML 0.6 on date 21-09-2018 and time 11:02:09 (Italy) in region 2 km NE Arnasco (SV)

A magnitude ML 0.6 (quarry blast) earthquake occured in region: 2 km NE Arnasco (SV), on

  • 21-09-2018 09:02:09 (UTC)
  • 21-09-2018 11:02:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.09, 8.12 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.

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 2 645 645
Cisano sul Neva SV 2 2085 2730
Zuccarello SV 2 309 3039
Vendone SV 4 388 3427
Castelbianco SV 4 330 3757
Castelvecchio di Rocca Barbena SV 4 145 3902
Ortovero SV 5 1586 5488
Erli SV 5 245 5733
Villanova d'Albenga SV 5 2657 8390
Balestrino SV 6 595 8985
Onzo SV 6 219 9204
Garlenda SV 7 1254 10458
Nasino SV 8 207 10665
Toirano SV 8 2644 13309
Casanova Lerrone SV 9 749 14058
Albenga SV 9 24213 38271
Ceriale SV 9 5561 43832
Ranzo IM 9 557 44389
Aquila d'Arroscia IM 9 166 44555
Boissano SV 9 2492 47047
Alto CN 9 128 47175
Borghetto Santo Spirito SV 10 4948 52123
Alassio SV 10 10934 63057
Stellanello SV 11 808 63865
Bardineto SV 11 756 64621
Borghetto d'Arroscia IM 12 456 65077
Loano SV 12 11407 76484
Testico SV 12 196 76680
Caprauna CN 13 104 76784
Laigueglia SV 13 1810 78594
Giustenice SV 14 977 79571
Vessalico IM 14 282 79853
Garessio CN 14 3244 83097
Villa Faraldi IM 14 444 83541
Pietra Ligure SV 15 8992 92533
Cesio IM 15 283 92816
Andora SV 15 7552 100368
Magliolo SV 15 974 101342
Tovo San Giacomo SV 15 2582 103924
Calizzano SV 16 1475 105399
Armo IM 16 111 105510
Borgio Verezzi SV 17 2205 107715
Chiusanico IM 17 607 108322
Caravonica IM 17 282 108604
Diano Arentino IM 17 722 109326
Pieve di Teco IM 17 1338 110664
Chiusavecchia IM 18 577 111241
Ormea CN 18 1617 112858
San Bartolomeo al Mare IM 18 3129 115987
Diano San Pietro IM 18 1145 117132
Cervo IM 19 1187 118319
Lucinasco IM 19 272 118591
Calice Ligure SV 19 1730 120321
Priola CN 19 701 121022
Rialto SV 19 564 121586
Pontedassio IM 19 2323 123909
Borgomaro IM 19 865 124774
Diano Castello IM 19 2214 126988
Aurigo IM 20 347 127335
Finale Ligure SV 20 11711 139046

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)
90 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
Rev 1000 ML 0.6 2018-09-21
09:02:09
44.09 8.12 1 2019-06-04
09:16:13
Bollettino Sismico Italiano INGV 67977101
Rev 100 ML 0.6 2018-09-21
09:02:09
44.1 8.1 6 2018-09-21
09:22:37
Sala Sismica INGV-Roma 61174851
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-09-21 09:02:09 ± 0.18
Latitude 44.09 ± 0.01
Longitude 8.12 ± 0.01
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 67977101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1450
Semi-minor axis of confidence ellipse (meter) 720
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 322
Circular confidence region, given by single value of horizontal uncertainty (meter) 1450
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 7
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.04407
Epicentral distance of station farthest from the epicenter (degree) 0.42178
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 61174851
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-09-21 09:22:37

ML:0.6

Field Value
Value 0.6
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 67977101
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-04-26 10:20:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
FR.SAOF.HHZ.00 2018-09-21T09:02:18.49 0.3 undecidable manual P 256 0.4218 91 -0.12 72
IV.QLNO.HHZ. 2018-09-21T09:02:15.09 0.6 undecidable manual P 35 0.2824 91 -0.42 46
IV.IMI.HHZ. 2018-09-21T09:02:14.69 0.3 undecidable manual P 222 0.2446 91 0.01 76
GU.GBOS.HHZ. 2018-09-21T09:02:14.57 0.1 undecidable manual P 307 0.25 91 -0.23 97
GU.MGRO.HHZ. 2018-09-21T09:02:14.37 0.3 undecidable manual P 258 0.2302 91 0.02 76
GU.CANO.HHZ. 2018-09-21T09:02:12.60 0.1 undecidable manual P 36 0.1421 92 0.2 100
GU.RORO.HHZ. 2018-09-21T09:02:10.49 0.1 undecidable manual P 297 0.0441 96 0.28 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHE. ML:0.9 9.665E-5 0.46 AML other m 2018-09-21T09:02:15.41
GU.CANO.HHN. ML:0.6 4.605E-5 0.28 AML other m 2018-09-21T09:02:15.47
GU.GBOS.HHE. ML:0.6 1.825E-5 0.42 AML other m 2018-09-21T09:02:19.80
GU.GBOS.HHN. ML:0.4 1.3E-5 0.42 AML other m 2018-09-21T09:02:24.84
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download