Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 31-08-2021 and time 16:07:28 (Italy) in region 2 km S Prazzo (CN)

A magnitude ML 1.6 earthquake occured in region: 2 km S Prazzo (CN), on

  • 31-08-2021 14:07:28 (UTC)
  • 31-08-2021 16:07:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.4640, 7.0490 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Prazzo CN 2 170 170
Canosio CN 3 80 250
Marmora CN 4 68 318
Acceglio CN 5 162 480
Stroppo CN 8 103 583
Elva CN 9 97 680
Celle di Macra CN 11 100 780
Argentera CN 11 83 863
Macra CN 11 59 922
Bellino CN 13 109 1031
Pietraporzio CN 13 77 1108
Sambuco CN 14 92 1200
Castelmagno CN 14 66 1266
Casteldelfino CN 14 157 1423
San Damiano Macra CN 17 430 1853
Sampeyre CN 17 1022 2875
Pontechianale CN 18 179 3054
Cartignano CN 19 190 3244
Pradleves CN 19 250 3494
Vinadio CN 20 644 4138

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km W of Cuneo (56081 inhabitants)
78 Km SW of Moncalieri (57294 inhabitants)
84 Km SW of Torino (890529 inhabitants)
93 Km NW of Sanremo (54807 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 1.6 2021-08-31
14:07:28		 44.4638 7.0487 10 2021-12-29
11:12:52		 Bollettino Sismico Italiano INGV 97523361
Reviewed
Rev100 		ML 1.5 2021-08-31
14:07:28		 44.4673 7.0615 11 2021-08-31
14:19:05		 Sala Sismica INGV-Roma 94873921
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-31 14:07:28 ± 0.17
Latitude 44.4638 ± 0.0063
Longitude 7.0487 ± 0.0139
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97523361

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1230
Semi-minor axis of confidence ellipse (meter) 171
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 65
Circular confidence region, given by single value of horizontal uncertainty (meter) 1230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 195
Number of associated phases, regardless of their use for origin computation 54
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.30492
Number of stations at which the event was observed 38
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 13
Type of magnitude ML
Reference to an origin 97523361
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-17 15:55:41

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 94873921
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-31 14:19:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TREG.EHZ. 2021-08-31T14:09:13.83 3.0 undecidable manual Sg 14.56 0
IV.ROVR.HHZ. 2021-08-31T14:09:12.71 3.0 undecidable manual Sg 13.83 0
IV.BRMO.HHZ. 2021-08-31T14:09:05.69 3.0 undecidable manual Sg 6.9 0
IV.TST02.HHZ. 2021-08-31T14:09:02.23 3.0 undecidable manual Pn 5.39 0
IV.SRES.HHZ. 2021-08-31T14:08:53.93 3.0 negative manual Pg 15.68 0
IV.VOBA.EHZ. 2021-08-31T14:08:53.38 3.0 undecidable manual Sn 3.51 0
CH.BERNI.HHZ. 2021-08-31T14:08:52.93 3.0 undecidable manual Sn -0.36 0
MN.TRI.HHZ. 2021-08-31T14:08:52.91 3.0 negative manual Pn 9.11 0
IV.OFFI.HHZ. 2021-08-31T14:08:49.34 3.0 negative manual Pn 4.13 0
IV.SAP2.EHZ. 2021-08-31T14:08:43.49 3.0 positive manual Pn 1.72 0
IV.MDI.HHZ. 2021-08-31T14:08:43.94 3.0 undecidable manual Sg 4.39 0
IV.APEC.HHZ. 2021-08-31T14:08:43.63 3.0 positive manual Pg 13.06 0
IV.LAV9.HHZ. 2021-08-31T14:08:42.16 3.0 negative manual Pn -1.83 0
IV.CRND.HNZ. 2021-08-31T14:08:40.56 3.0 undecidable manual Pg 12.48 0
IV.ATFO.HHZ. 2021-08-31T14:08:40.04 3.0 undecidable manual Pn 7.32 0
IV.GAVE.EHZ. 2021-08-31T14:08:40.66 3.0 negative manual Pn 1.72 0
IV.ATMI.HHZ. 2021-08-31T14:08:28.96 3.0 positive manual Pn -0.97 0
IV.TREG.HNZ. 2021-08-31T14:08:27.39 3.0 positive manual Pg 8.49 0
IV.BRSN.HNZ. 2021-08-31T14:08:24.67 3.0 negative manual Pn -1.02 0
IV.BRMO.HHZ. 2021-08-31T14:08:21.56 3.0 positive manual Pn 2.93 0
CH.BNALP.HHZ. 2021-08-31T14:08:18.78 3.0 undecidable manual Pg 7.2 0
IV.NDIM.HNZ. 2021-08-31T14:08:16.42 3.0 positive manual Pn 2.05 0
IV.CADC.EHZ. 2021-08-31T14:08:10.84 3.0 negative manual Pn 1.58 0
GU.PCP.HHZ. 2021-08-31T14:08:02.91 1.0 undecidable manual S 85 118.6923 50 0.34 24
GU.LSD.HHE. 2021-08-31T14:08:00.47 0.6 undecidable manual S 3 110.7003 50 0.06 53
IV.QLNO.HHE. 2021-08-31T14:07:58.67 0.6 undecidable manual S 98 104.0181 50 0.04 54
IV.SARZ.HHZ. 2021-08-31T14:07:57.73 3.0 positive manual P 2.37 0
GU.IMI.HHZ. 2021-08-31T14:07:55.30 0.6 undecidable manual S 132 91.0422 50 0.14 54
GU.RORO.HHE. 2021-08-31T14:07:54.90 0.6 undecidable manual S 115 89.7435 50 0.07 55
IV.MRGE.HHE. 2021-08-31T14:07:51.86 1.0 undecidable manual P 0 144.8439 50 -0.24 24
GU.MGRO.HHE. 2021-08-31T14:07:51.20 0.6 undecidable manual S 127 76.368 50 -0.05 57
GU.RSP.HHZ. 2021-08-31T14:07:51.50 0.6 undecidable manual S 13 77.7666 50 -0.14 55
FR.SAOF.HHE. 2021-08-31T14:07:48.69 0.6 undecidable manual S 143 66.4779 50 0.08 57
GU.GBOS.HHE. 2021-08-31T14:07:48.50 0.6 undecidable manual S 111 67.377 50 -0.37 54
GU.PCP.HHZ. 2021-08-31T14:07:48.53 0.6 undecidable manual P 85 118.6923 50 0.46 48
GU.LSD.HHE. 2021-08-31T14:07:47.63 3.0 undecidable manual P 3 110.7003 50 0.8 0
IV.QLNO.HHE. 2021-08-31T14:07:46.48 3.0 undecidable manual P 98 104.0181 50 0.69 0
GU.RRL.HHZ. 2021-08-31T14:07:45.30 0.6 undecidable manual S 338 54.7008 50 -0.16 58
GU.CANO.HHE. 2021-08-31T14:07:45.38 0.1 undecidable manual P 106 98.5236 50 0.43 100
GU.IMI.HHZ. 2021-08-31T14:07:44.16 0.3 undecidable manual P 132 91.0422 50 0.37 77
GU.RORO.HHE. 2021-08-31T14:07:43.97 0.6 undecidable manual P 115 89.7435 50 0.37 52
GU.RSP.HHZ. 2021-08-31T14:07:42.21 0.3 undecidable manual P 13 77.7666 50 0.45 78
GU.BHB.HHZ. 2021-08-31T14:07:42.50 0.6 undecidable manual S 22 44.5221 50 -0.27 57
GU.MGRO.HHE. 2021-08-31T14:07:41.82 0.3 undecidable manual P 127 76.368 50 0.29 81
GU.ENR.HHZ. 2021-08-31T14:07:40.94 0.6 undecidable manual S 131 39.2274 50 -0.39 56
GU.GBOS.HHE. 2021-08-31T14:07:40.49 0.3 undecidable manual P 111 67.377 50 0.33 81
FR.SAOF.HHE. 2021-08-31T14:07:40.45 0.3 undecidable manual P 143 66.4779 50 0.44 80
GU.STV.HHZ. 2021-08-31T14:07:38.88 0.3 undecidable manual S 138 32.745 50 -0.74 76
GU.RRL.HHZ. 2021-08-31T14:07:38.07 0.3 undecidable manual P 338 54.7008 50 -0.12 87
GU.BHB.HHZ. 2021-08-31T14:07:36.50 0.3 undecidable manual P 22 44.5221 50 -0.14 88
GU.ENR.HHZ. 2021-08-31T14:07:35.40 0.3 undecidable manual P 131 39.2274 50 -0.41 84
GU.STV.HHZ. 2021-08-31T14:07:34.34 0.3 undecidable manual P 138 32.745 50 -0.48 84
GU.PZZ.HHZ. 2021-08-31T14:07:32.30 0.6 undecidable manual S 48 7.0929 146 -0.32 61
GU.PZZ.HHZ. 2021-08-31T14:07:30.72 0.3 undecidable manual P 48 7.0929 146 -0.06 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.ENR.HHE. ML:1.6 0.00013383889999999998 0.1216 AML other m 2021-08-31T14:07:41.11
GU.ENR.HHN. ML:1.6 0.0001455 0.06 AML other m 2021-08-31T14:07:41.66
GU.BHB.HNE. ML:1.5 0.000097146205 0.1344 AML other m 2021-08-31T14:07:43.25
GU.BHB.HHE. ML:1.5 0.000094311935 0.1216 AML other m 2021-08-31T14:07:43.25
GU.BHB.HHN. ML:1.5 0.00010140116500000002 0.4352 AML other m 2021-08-31T14:07:43.11
GU.BHB.HNN. ML:1.5 0.000106822125 0.1472 AML other m 2021-08-31T14:07:44.14
GU.RSP.HNE. ML:1.5 0.00004509379 0.768 AML other m 2021-08-31T14:07:53.30
GU.RSP.HHE. ML:1.5 0.000048221275000000004 0.4992 AML other m 2021-08-31T14:07:52.92
GU.RSP.HNN. ML:1.4 0.00004241947500000001 2.1184 AML other m 2021-08-31T14:07:53.07
GU.IMI.HHN. ML:1.6 0.000049271300000000004 0.0768 AML other m 2021-08-31T14:07:56.87
GU.IMI.HHE. ML:1.5 0.000039363099999999996 0.7808 AML other m 2021-08-31T14:07:56.52
GU.PCP.HHE. ML:1.6 0.000030431465000000003 1.9456 AML other m 2021-08-31T14:08:05.30
GU.PCP.HHN. ML:1.6 0.000030894375 1.9008 AML other m 2021-08-31T14:08:05.26
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