Earthquake (quarry blast) with magnitude of ML 0.3 on date 23-12-2020 and time 09:02:34 (UTC) in region 3 km SW Bagnasco (CN)

A magnitude ML 0.3 (quarry blast) earthquake occured in region: 3 km SW Bagnasco (CN), on

  • 23-12-2020 09:02:34 (UTC)
  • 23-12-2020 10:02:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.28, 8.02 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
Bagnasco CN 3 1035 1035
Priola CN 4 701 1736
Viola CN 5 391 2127
Lisio CN 5 201 2328
Battifollo CN 5 219 2547
Massimino SV 5 113 2660
Scagnello CN 7 194 2854
Nucetto CN 8 430 3284
Perlo CN 8 116 3400
Pamparato CN 9 302 3702
Monasterolo Casotto CN 9 89 3791
Calizzano SV 9 1475 5266
Garessio CN 9 3244 8510
Mombasiglio CN 10 609 9119
Roburent CN 11 495 9614
Murialdo SV 12 841 10455
Ceva CN 12 5782 16237
Castelnuovo di Ceva CN 12 110 16347
Priero CN 12 529 16876
Torre Mondovì CN 13 498 17374
Bardineto SV 13 756 18130
Montaldo di Mondovì CN 13 557 18687
San Michele Mondovì CN 14 2003 20690
Sale delle Langhe CN 14 486 21176
Sale San Giovanni CN 14 183 21359
Lesegno CN 14 794 22153
Osiglia SV 14 444 22597
Montezemolo CN 15 259 22856
Roascio CN 16 97 22953
Vicoforte CN 16 3136 26089
Roccavignale SV 17 752 26841
Ormea CN 17 1617 28458
Bormida SV 17 387 28845
Frabosa Soprana CN 17 759 29604
Castellino Tanaro CN 17 312 29916
Erli SV 17 245 30161
Monastero di Vasco CN 17 1297 31458
Torresina CN 17 52 31510
Niella Tanaro CN 17 1046 32556
Briaglia CN 17 318 32874
Paroldo CN 18 211 33085
Millesimo SV 18 3383 36468
Frabosa Sottana CN 18 1497 37965
Nasino SV 18 207 38172
Castelvecchio di Rocca Barbena SV 18 145 38317
Igliano CN 18 74 38391
Caprauna CN 19 104 38495
Camerana CN 19 631 39126
Castelbianco SV 19 330 39456
Alto CN 19 128 39584
Cigliè CN 19 190 39774
Saliceto CN 19 1323 41097
Cengio SV 19 3563 44660
Rocca Cigliè CN 19 142 44802
Marsaglia CN 20 245 45047
Plodio SV 20 650 45697
Cosseria SV 20 1105 46802
Zuccarello SV 20 309 47111

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km W of Savona (61345 inhabitants)
40 Km E of Cuneo (56081 inhabitants)
54 Km NE of Sanremo (54807 inhabitants)
71 Km S of Asti (76202 inhabitants)
74 Km W of Genova (586655 inhabitants)
85 Km SE of Moncalieri (57294 inhabitants)
85 Km SW of Alessandria (93943 inhabitants)
92 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 0.3 2020-12-23
09:02:34
44.28 8.02 1 2021-02-26
14:56:17
Bollettino Sismico Italiano INGV 86637891
Reviewed
Rev100
ML 0.2 2020-12-23
09:02:34
44.29 8.03 6 2020-12-23
09:10:06
Sala Sismica INGV-Roma 85645601
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-23 09:02:34 ± 0.24
Latitude 44.28 ± 0.03
Longitude 8.02 ± 0.02
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 86637891

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 3520
Semi-minor axis of confidence ellipse (meter) 1230
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 351
Circular confidence region, given by single value of horizontal uncertainty (meter) 3520
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 151
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) 0.46
Epicentral distance of station closest to the epicenter (degree) 0.1349
Epicentral distance of station farthest from the epicenter (degree) 0.45686
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

ML:0.3

Field Value
Value 0.3
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 86637891
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-27 18:18:48

ML:0.2

Field Value
Value 0.2
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 85645601
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-23 09:10:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.PCP.HHZ. 2020-12-23T09:02:44.96 0.3 undecidable manual P 55 0.4569 91 0.28 67
GU.ENR.HHZ. 2020-12-23T09:02:43.61 0.3 undecidable manual P 264 0.4344 91 -0.57 63
IV.QLNO.HHZ. 2020-12-23T09:02:39.56 0.1 undecidable manual P 79 0.2365 91 -0.22 95
GU.CANO.HHZ. 2020-12-23T09:02:38.33 0.1 undecidable manual P 115 0.17 92 0.03 100
GU.GBOS.HHZ. 2020-12-23T09:02:37.89 0.1 undecidable manual P 254 0.1349 92 0.37 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GBOS.HHE. ML:-0.1 1.0296817E-5 0.2176 AML other m 2020-12-23T09:02:40.67
GU.GBOS.HHN. ML:0.1 1.3550684E-5 0.1984 AML other m 2020-12-23T09:02:40.60
GU.CANO.HHE. ML:0.9 7.190116E-5 0.88 AML other m 2020-12-23T09:02:40.26
GU.CANO.HHN. ML:0.4 2.5907385E-5 0.9568 AML other m 2020-12-23T09:02:41.50
IV.QLNO.HHE. ML:0.2 9.2613815E-6 1.1552 AML other m 2020-12-23T09:02:42.79
IV.QLNO.HHN. ML:-0.1 2.78679E-6 0.2176 AML other m 2020-12-23T09:02:43.05
GU.ENR.HHE. ML:0.2 6.087479E-6 0.5632 AML other m 2020-12-23T09:02:50.78
GU.ENR.HHN. ML:1 2.391218E-5 0.144 AML other m 2020-12-23T09:02:51.38
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