Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 0.8 on date 13-10-2021 and time 09:54:55 (UTC) in region 3 km S Dego (SV)

A magnitude ML 0.8 (quarry blast) earthquake occured in region: 3 km S Dego (SV), on

  • 13-10-2021 09:54:55 (UTC)
  • 13-10-2021 11:54:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.4240, 8.3190 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
Dego SV 3 1985 1985
Cairo Montenotte SV 4 13269 15254
Giusvalla SV 7 441 15695
Piana Crixia SV 7 788 16483
Carcare SV 8 5587 22070
Cosseria SV 9 1105 23175
Cengio SV 10 3563 26738
Plodio SV 10 650 27388
Pontinvrea SV 10 847 28235
Altare SV 10 2108 30343
Mioglia SV 11 526 30869
Merana AL 11 189 31058
Millesimo SV 11 3383 34441
Pallare SV 11 923 35364
Pareto AL 12 554 35918
Saliceto CN 12 1323 37241
Roccavignale SV 12 752 37993
Gottasecca CN 13 148 38141
Castelletto Uzzone CN 13 331 38472
Spigno Monferrato AL 13 1050 39522
Camerana CN 14 631 40153
Stella SV 14 3009 43162
Mallare SV 15 1146 44308
Montezemolo CN 15 259 44567
Sassello SV 15 1777 46344
Serole AT 15 123 46467
Prunetto CN 16 451 46918
Quiliano SV 16 7232 54150
Pezzolo Valle Uzzone CN 16 344 54494
Mombaldone AT 16 209 54703
Monesiglio CN 17 645 55348
Castelnuovo di Ceva CN 17 110 55458
Malvicino AL 17 85 55543
Murialdo SV 17 841 56384
Bormida SV 17 387 56771
Gorzegno CN 18 304 57075
Bergolo CN 18 71 57146
Albisola Superiore SV 18 10163 67309
Levice CN 18 231 67540
Albissola Marina SV 18 5487 73027
Savona SV 18 61345 134372
Osiglia SV 18 444 134816
Priero CN 19 529 135345
Sale delle Langhe CN 19 486 135831
Olmo Gentile AT 19 80 135911
Mombarcaro CN 19 268 136179
Roccaverano AT 19 399 136578
Sale San Giovanni CN 19 183 136761
Vado Ligure SV 20 8336 145097
Denice AL 20 176 145273
Paroldo CN 20 211 145484
Montechiaro d'Acqui AL 20 560 146044

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km NW of Savona (61345 inhabitants)
49 Km W of Genova (586655 inhabitants)
54 Km S of Asti (76202 inhabitants)
59 Km SW of Alessandria (93943 inhabitants)
61 Km E of Cuneo (56081 inhabitants)
79 Km NE of Sanremo (54807 inhabitants)
81 Km SE of Moncalieri (57294 inhabitants)
88 Km SE of Torino (890529 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 0.8 2021-10-13
09:54:55		 44.4242 8.3188 1 2022-03-30
13:04:28		 Bollettino Sismico Italiano INGV 99549231
Reviewed
Rev100 		ML 0.9 2021-10-13
09:54:54		 44.3598 8.4473 9 2021-10-13
10:09:45		 Sala Sismica INGV-Roma 96495641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-13 09:54:55 ± 0.38
Latitude 44.4242 ± 0.0279
Longitude 8.3188 ± 0.0365
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 99549231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 3780
Semi-minor axis of confidence ellipse (meter) 1880
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 318
Circular confidence region, given by single value of horizontal uncertainty (meter) 3780.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 172
Number of associated phases, regardless of their use for origin computation 26
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) 0.59715
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 99549231
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-10 17:32:00

ML:0.9

Field Value
Value 0.9
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 96495641
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-13 10:09:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARRO.EHZ. 2021-10-13T09:56:46.10 3.0 undecidable manual Sg 16.84 0
IV.IFIL.HHZ. 2021-10-13T09:56:42.35 3.0 positive manual Pn 3.86 0
IX.SCL3.EHZ.02 2021-10-13T09:56:39.08 3.0 undecidable manual Pg 15.79 0
IV.SCHR.EHZ. 2021-10-13T09:56:33.59 3.0 undecidable manual Pn 1.34 0
IV.VTIR.HHZ. 2021-10-13T09:56:31.92 3.0 negative manual Pg 18.110001 0
IV.MRLC.HHZ. 2021-10-13T09:56:30.84 3.0 undecidable manual Pn 8.27 0
IV.CAFE.HHZ. 2021-10-13T09:56:29.43 3.0 undecidable manual Pn 11.26 0
IX.COL3.HHZ.02 2021-10-13T09:56:28.02 3.0 positive manual Pn 6.1 0
IV.MGR.HHZ. 2021-10-13T09:56:28.08 3.0 undecidable manual Pn -0.66 0
SL.LJU.BHZ. 2021-10-13T09:56:16.12 3.0 undecidable manual Pg 20.43 0
IV.MURB.HHZ. 2021-10-13T09:56:16.03 3.0 undecidable manual Sn -0.77 0
IV.CESX.HHZ. 2021-10-13T09:56:01.09 3.0 undecidable manual Pg 17.76 0
IV.FIU.EHZ. 2021-10-13T09:55:59.58 3.0 undecidable manual Sg 9.11 0
IV.SAMA.EHZ. 2021-10-13T09:55:58.00 3.0 positive manual Pn 7.1 0
IV.RIBO.EHZ.01 2021-10-13T09:55:57.38 3.0 undecidable manual Sn -2.35 0
IV.SENA.HHZ. 2021-10-13T09:55:55.04 3.0 undecidable manual Pn 1.56 0
CH.BERNI.HHZ. 2021-10-13T09:55:53.92 3.0 undecidable manual Sg 2.36 0
GU.GSCL.HHZ. 2021-10-13T09:55:36.52 3.0 undecidable manual S 1.16 0
GU.RRL.HHZ. 2021-10-13T09:55:35.85 3.0 undecidable manual S -0.27 0
GU.IMI.HHE. 2021-10-13T09:55:07.50 0.3 undecidable manual P 211 66.2781 50 -0.58 64
GU.MGRO.HHZ. 2021-10-13T09:55:06.45 0.3 undecidable manual P 224 58.5969 90 -0.39 68
GU.GBOS.HHZ. 2021-10-13T09:55:04.61 0.3 undecidable manual P 242 43.0236 91 0.89 59
GU.RORO.HHE. 2021-10-13T09:55:02.85 0.3 undecidable manual P 210 39.9267 91 -0.25 73
IV.PCN.EHZ. 2021-10-13T09:55:02.36 3.0 negative manual P -3.8 0
GU.PCP.HHZ. 2021-10-13T09:54:59.49 0.3 undecidable manual P 54 22.1556 91 -0.04 78
IV.QLNO.HHZ. 2021-10-13T09:54:57.69 0.1 undecidable manual P 169 11.2776 93 0.34 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.QLNO.HHN. ML:0.2 0.000025958829999999998 0.0832 AML other m 2021-10-13T09:54:59.55
IV.QLNO.HHE. ML:0.1 0.000020636965 0.0768 AML other m 2021-10-13T09:55:00.23
GU.CANO.HHE. ML:1.0 0.00006641084999999999 0.7392 AML other m 2021-10-13T09:55:12.80
GU.CANO.HHN. ML:0.7 0.000037375555000000005 0.096 AML other m 2021-10-13T09:55:16.26
GU.GBOS.HHE. ML:0.9 0.000023365795000000002 0.3616 AML other m 2021-10-13T09:55:23.39
GU.MGRO.HNE. ML:1.9 0.00019062948000000003 0.4256 AML other m 2021-10-13T09:55:24.46
GU.GBOS.HHN. ML:0.7 0.000013488425 0.5024 AML other m 2021-10-13T09:55:28.86
GU.MGRO.HHN. ML:1.1 0.000031206995 0.1824 AML other m 2021-10-13T09:55:36.48
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