Earthquake (quarry blast) with magnitude of ML 0.4 on date 22-09-2021 and time 09:12:20 (Italy) in region 2 km SW Bagnasco (CN)

A magnitude ML 0.4 (quarry blast) earthquake occured in region: 2 km SW Bagnasco (CN), on

  • 22-09-2021 07:12:20 (UTC)
  • 22-09-2021 09:12:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2930, 8.0210 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 2 1035 1035
Battifollo CN 3 219 1254
Lisio CN 4 201 1455
Massimino SV 4 113 1568
Viola CN 4 391 1959
Scagnello CN 5 194 2153
Priola CN 5 701 2854
Nucetto CN 6 430 3284
Perlo CN 7 116 3400
Monasterolo Casotto CN 8 89 3489
Pamparato CN 9 302 3791
Mombasiglio CN 9 609 4400
Calizzano SV 10 1475 5875
Roburent CN 10 495 6370
Ceva CN 11 5782 12152
Garessio CN 11 3244 15396
Priero CN 11 529 15925
Castelnuovo di Ceva CN 11 110 16035
Murialdo SV 12 841 16876
Torre Mondovì CN 12 498 17374
Montaldo di Mondovì CN 13 557 17931
Sale delle Langhe CN 13 486 18417
Sale San Giovanni CN 13 183 18600
Lesegno CN 13 794 19394
San Michele Mondovì CN 13 2003 21397
Montezemolo CN 14 259 21656
Roascio CN 14 97 21753
Bardineto SV 14 756 22509
Osiglia SV 14 444 22953
Castellino Tanaro CN 15 312 23265
Vicoforte CN 15 3136 26401
Torresina CN 16 52 26453
Roccavignale SV 16 752 27205
Niella Tanaro CN 16 1046 28251
Paroldo CN 16 211 28462
Briaglia CN 16 318 28780
Monastero di Vasco CN 17 1297 30077
Millesimo SV 17 3383 33460
Igliano CN 17 74 33534
Frabosa Soprana CN 17 759 34293
Bormida SV 17 387 34680
Camerana CN 17 631 35311
Cigliè CN 18 190 35501
Frabosa Sottana CN 18 1497 36998
Rocca Cigliè CN 18 142 37140
Saliceto CN 18 1323 38463
Marsaglia CN 18 245 38708
Ormea CN 18 1617 40325
Cengio SV 18 3563 43888
Erli SV 19 245 44133
Cosseria SV 19 1105 45238
Mondovì CN 19 22484 67722
Plodio SV 19 650 68372
Bastia Mondovì CN 19 669 69041
Castelvecchio di Rocca Barbena SV 20 145 69186
Nasino SV 20 207 69393

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km W of Savona (61345 inhabitants)
39 Km E of Cuneo (56081 inhabitants)
56 Km NE of Sanremo (54807 inhabitants)
69 Km S of Asti (76202 inhabitants)
74 Km W of Genova (586655 inhabitants)
83 Km SE of Moncalieri (57294 inhabitants)
84 Km SW of Alessandria (93943 inhabitants)
91 Km SE of Torino (890529 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 0.4 2021-09-22
07:12:20
44.2933 8.021 1 2022-03-30
13:04:38
Bollettino Sismico Italiano INGV 101115421
Reviewed
Rev100
ML 0.4 2021-09-22
07:12:20
44.2692 8.0247 8 2021-09-22
07:26:58
Sala Sismica INGV-Roma 95727321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-22 07:12:20 ± 0.11
Latitude 44.2933 ± 0.0099
Longitude 8.0210 ± 0.0075
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 101115421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1060
Semi-minor axis of confidence ellipse (meter) 540
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 353
Circular confidence region, given by single value of horizontal uncertainty (meter) 1060.0
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 34
Number of defining phases 7
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.49912
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 101115421
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-18 16:13:32

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 95727321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-22 07:26:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SPS2.HHZ. 2021-09-22T07:14:17.07 3.0 positive manual Pn -5.38 0
IV.MPAG.EHZ. 2021-09-22T07:14:17.08 3.0 undecidable manual Sg 12.26 0
IV.IST3.HHZ. 2021-09-22T07:14:14.94 3.0 negative manual Pn -3.78 0
OT.OT05.EHZ. 2021-09-22T07:14:14.11 3.0 negative manual Pg 16.889999 0
IV.MTL1.HNZ. 2021-09-22T07:14:03.70 3.0 undecidable manual Sn -7.99 0
IV.NARO.HHZ. 2021-09-22T07:13:55.64 3.0 undecidable manual Sn -6.2 0
IV.TERO.HNZ. 2021-09-22T07:13:45.46 3.0 undecidable manual P 12.49 0
IV.CERA.HHZ. 2021-09-22T07:13:42.73 3.0 negative manual Pn -0.9 0
IV.FERS.HNZ. 2021-09-22T07:13:40.79 3.0 undecidable manual Sn -0.92 0
IV.CSP1.EHZ. 2021-09-22T07:13:38.64 3.0 negative manual P 11.9 0
IV.GAVE.EHZ. 2021-09-22T07:13:38.72 3.0 positive manual P 12.65 0
IV.NRCA.HHZ. 2021-09-22T07:13:37.50 3.0 undecidable manual Pg 10.25 0
IV.MML1.EHZ. 2021-09-22T07:13:37.17 3.0 positive manual Pg 12.73 0
IV.FDMO.HHZ. 2021-09-22T07:13:36.96 3.0 positive manual Pg 11.05 0
IV.MNTV.EHZ. 2021-09-22T07:13:36.69 3.0 undecidable manual Sg 6.17 0
IT.MTCL.HGZ. 2021-09-22T07:13:35.90 3.0 positive manual Pg 10.59 0
IV.CESI.HHZ. 2021-09-22T07:13:35.46 3.0 undecidable manual Pg 11.09 0
IV.ARVD.HHZ. 2021-09-22T07:13:33.14 3.0 undecidable manual Pg 10.65 0
MN.TRI.HHZ. 2021-09-22T07:13:26.46 3.0 undecidable manual Pn -4.31 0
IV.APEC.HHZ. 2021-09-22T07:13:17.75 3.0 negative manual Pn 0.51 0
IV.NARO.HHZ. 2021-09-22T07:13:16.74 3.0 undecidable manual Pn -1.86 0
IV.MILN.HHZ. 2021-09-22T07:13:09.88 3.0 undecidable manual S -2.07 0
CH.DAVOX.HHZ. 2021-09-22T07:13:08.35 3.0 negative manual Pn -0.3 0
IV.IMOL.EHZ. 2021-09-22T07:13:06.18 3.0 positive manual Pn -2.62 0
IV.BAG8.EHZ. 2021-09-22T07:13:04.48 3.0 undecidable manual Pg 1.91 0
IV.CAVE.HHZ. 2021-09-22T07:13:01.83 3.0 positive manual Pn -0.2 0
GU.LSD.HHZ. 2021-09-22T07:12:45.00 3.0 positive manual P -1.98 0
GU.STV.HHZ. 2021-09-22T07:12:31.39 0.3 undecidable manual P 265 0.4991 91 -0.05 73
GU.PCP.HHZ. 2021-09-22T07:12:30.42 0.3 undecidable manual P 56 0.4488 91 0.1 73
GU.ENR.HHZ. 2021-09-22T07:12:29.68 0.3 undecidable manual P 262 0.4362 91 -0.35 70
IV.QLNO.HHZ. 2021-09-22T07:12:25.50 0.6 undecidable manual P 82 0.2347 91 -0.04 52
GU.RORO.HHZ. 2021-09-22T07:12:24.42 0.3 undecidable manual P 170 0.1835 91 0 79
GU.CANO.HHZ. 2021-09-22T07:12:24.19 0.3 undecidable manual P 119 0.1772 91 -0.08 78
GU.GBOS.HHZ. 2021-09-22T07:12:23.72 0.1 undecidable manual P 248 0.1394 92 0.29 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GBOS.HHN. ML:0.1 0.000015682475000000003 0.1408 AML other m 2021-09-22T07:12:26.59
GU.GBOS.HHE. ML:-0.1 0.000012442635000000001 0.1184 AML other m 2021-09-22T07:12:27.21
GU.CANO.HHE. ML:0.7 0.000046544114999999995 1.2608 AML other m 2021-09-22T07:12:27.69
IV.QLNO.HHE. ML:0.4 0.0000166486835 0.24 AML other m 2021-09-22T07:12:29.34
IV.QLNO.HHN. ML:0.2 0.000012455461999999999 0.0992 AML other m 2021-09-22T07:12:29.70
GU.CANO.HHN. ML:0.6 0.000033608367 0.2976 AML other m 2021-09-22T07:12:29.95
GU.ENR.HHN. ML:0.7 0.0000128646445 1.9008 AML other m 2021-09-22T07:12:36.99
GU.ENR.HHE. ML:0.6 0.000008189673500000001 0.0992 AML other m 2021-09-22T07:12:37.43
GU.PCP.HHN. ML:0.6 0.0000077825715 0.7968 AML other m 2021-09-22T07:12:37.54
GU.PCP.HHE. ML:0.3 0.000004881204 0.5984 AML other m 2021-09-22T07:12:37.67
GU.STV.HHN. ML:0.3 0.0000027546014999999998 0.3808 AML other m 2021-09-22T07:12:38.24
GU.STV.HHE. ML:0.3 0.0000028789755500000003 0.4992 AML other m 2021-09-22T07:12:38.04
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download