Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 1.2 on date 22-07-2021 and time 09:52:26 (Italy) in region 1 km NE Robilante (CN)

A magnitude ML 1.2 (quarry blast) earthquake occured in region: 1 km NE Robilante (CN), on

  • 22-07-2021 07:52:26 (UTC)
  • 22-07-2021 09:52:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3040, 7.5170 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Robilante CN 1 2306 2306
Roccavione CN 3 2761 5067
Borgo San Dalmazzo CN 4 12468 17535
Boves CN 4 9835 27370
Roaschia CN 6 107 27477
Vernante CN 7 1178 28655
Roccasparvera CN 7 741 29396
Vignolo CN 7 2600 31996
Peveragno CN 9 5543 37539
Gaiola CN 9 582 38121
Cervasca CN 10 5013 43134
Valdieri CN 10 935 44069
Moiola CN 10 234 44303
Cuneo CN 10 56081 100384
Rittana CN 11 109 100493
Bernezzo CN 12 4104 104597
Entracque CN 12 774 105371
Valloriate CN 12 109 105480
Limone Piemonte CN 12 1485 106965
Beinette CN 13 3423 110388
Chiusa di Pesio CN 13 3676 114064
Caraglio CN 15 6836 120900
Valgrana CN 16 786 121686
Pianfei CN 17 2202 123888
Demonte CN 17 2003 125891
Margarita CN 18 1441 127332
Roccaforte Mondovì CN 18 2085 129417
Castelletto Stura CN 19 1351 130768
Montemale di Cuneo CN 19 241 131009
Monterosso Grana CN 19 505 131514

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km S of Cuneo (56081 inhabitants)
58 Km NW of Sanremo (54807 inhabitants)
77 Km W of Savona (61345 inhabitants)
79 Km S of Moncalieri (57294 inhabitants)
86 Km SW of Asti (76202 inhabitants)
87 Km S 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 1.2 2021-07-22
07:52:26		 44.3038 7.5168 1 2021-12-29
11:12:51		 Bollettino Sismico Italiano INGV 97494001
Reviewed
Rev100 		ML 1.2 2021-07-22
07:52:26		 44.2747 7.4818 10 2021-07-22
07:57:57		 Sala Sismica INGV-Roma 93052551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-22 07:52:26 ± 0.13
Latitude 44.3038 ± 0.0099
Longitude 7.5168 ± 0.0101
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 97494001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1130
Semi-minor axis of confidence ellipse (meter) 730
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 21
Circular confidence region, given by single value of horizontal uncertainty (meter) 1130.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 119
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.56118
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 97494001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-16 15:25:39

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 93052551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-22 07:57:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TOLF.HHZ. 2021-07-22T07:54:15.46 3.0 undecidable manual Sn -1.99 0
IV.PE3.EHZ. 2021-07-22T07:54:09.22 3.0 undecidable manual Sn 0.09 0
IV.MF5.EHZ. 2021-07-22T07:53:45.94 3.0 negative manual Pg 9.77 0
IV.CRE.HHZ. 2021-07-22T07:53:28.79 3.0 undecidable manual Pg 9.63 0
IV.RIBO.EHZ.01 2021-07-22T07:53:17.04 3.0 negative manual Pn 2.91 0
IV.FIR.HHZ. 2021-07-22T07:53:16.01 3.0 undecidable manual Pn 4.1 0
GU.LSD.HHZ. 2021-07-22T07:53:07.47 3.0 undecidable manual S -0.98 0
IV.SARZ.HHZ. 2021-07-22T07:53:02.94 3.0 undecidable manual S -4.57 0
RD.PGF.BHZ. 2021-07-22T07:53:00.10 3.0 undecidable manual Pn -2.75 0
GU.BHB.HNZ. 2021-07-22T07:52:38.35 0.3 undecidable manual P 341 62.2932 50 -0.29 87
GU.CANO.HHZ. 2021-07-22T07:52:37.77 0.3 undecidable manual P 100 58.1973 90 -0.16 90
GU.IMI.HHZ. 2021-07-22T07:52:36.48 0.3 undecidable manual P 145 52.9026 91 -0.39 87
GU.PZZ.HHE. 2021-07-22T07:52:34.19 0.3 undecidable manual P 305 38.9277 91 0.13 94
GU.MGRO.HHZ. 2021-07-22T07:52:33.78 0.3 undecidable manual P 141 37.1295 91 0.08 95
GU.GBOS.HHZ. 2021-07-22T07:52:32.08 0.3 undecidable manual P 105 26.5512 91 0.49 89
GU.STV.HHZ. 2021-07-22T07:52:29.73 0.3 undecidable manual P 247 16.4724 92 0.17 97
GU.ENR.HHZ. 2021-07-22T07:52:28.48 0.3 undecidable manual P 224 11.3775 93 -0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.ENR.HHN. ML:1.3 0.000302 0.82 AML other m 2021-07-22T07:52:31.52
GU.ENR.HHE. ML:1.3 0.00029400000000000004 0.82 AML other m 2021-07-22T07:52:32.13
GU.STV.HHN. ML:0.8 0.00006319999999999999 0.88 AML other m 2021-07-22T07:52:32.13
GU.GBOS.HHE. ML:1.1 0.00007450000000000001 1.08 AML other m 2021-07-22T07:52:32.68
GU.STV.HHE. ML:0.8 0.00006835 0.56 AML other m 2021-07-22T07:52:33.98
GU.GBOS.HHN. ML:1.1 0.0000804 1.66 AML other m 2021-07-22T07:52:38.15
GU.MGRO.HHE. ML:1.2 0.00006520000000000001 0.54 AML other m 2021-07-22T07:52:44.34
GU.MGRO.HHN. ML:1.4 0.00010155 1.34 AML other m 2021-07-22T07:52:44.07
GU.IMI.HHN. ML:1.3 0.0000455 0.56 AML other m 2021-07-22T07:52:44.65
GU.CANO.HHN. ML:1.7 0.0001115 0.26 AML other m 2021-07-22T07:52:47.96
GU.CANO.HHE. ML:1.5 0.00006685 1.36 AML other m 2021-07-22T07:52:47.91
GU.IMI.HHE. ML:1.1 0.0000286 0.58 AML other m 2021-07-22T07:52:48.35
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