Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 21-07-2021 and time 05:36:25 (Italy) in region 4 km SE Celle di Macra (CN)

A magnitude ML 1.1 earthquake occured in region: 4 km SE Celle di Macra (CN), on

  • 21-07-2021 03:36:25 (UTC)
  • 21-07-2021 05:36:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.4590, 7.2100 at 15 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.

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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
Celle di Macra CN 4 100 100
San Damiano Macra CN 5 430 530
Macra CN 5 59 589
Castelmagno CN 5 66 655
Cartignano CN 7 190 845
Pradleves CN 7 250 1095
Stroppo CN 9 103 1198
Marmora CN 9 68 1266
Canosio CN 10 80 1346
Monterosso Grana CN 11 505 1851
Roccabruna CN 11 1585 3436
Dronero CN 12 7035 10471
Prazzo CN 13 170 10641
Elva CN 13 97 10738
Montemale di Cuneo CN 13 241 10979
Sampeyre CN 14 1022 12001
Frassino CN 14 265 12266
Villar San Costanzo CN 14 1547 13813
Valmala CN 15 52 13865
Melle CN 15 292 14157
Valgrana CN 15 786 14943
Aisone CN 16 248 15191
Sambuco CN 17 92 15283
Vinadio CN 17 644 15927
Demonte CN 17 2003 17930
Brossasco CN 17 1084 19014
Acceglio CN 17 162 19176
Caraglio CN 18 6836 26012
Casteldelfino CN 19 157 26169
Valloriate CN 19 109 26278
Venasca CN 19 1437 27715
Pietraporzio CN 19 77 27792
Rittana CN 19 109 27901
Bernezzo CN 20 4104 32005
Isasca CN 20 76 32081

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km W of Cuneo (56081 inhabitants)
71 Km SW of Moncalieri (57294 inhabitants)
78 Km SW of Torino (890529 inhabitants)
84 Km NW of Sanremo (54807 inhabitants)
93 Km SW of Asti (76202 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 1.1 2021-07-21
03:36:25		 44.4587 7.2105 15 2021-12-29
11:12:19		 Bollettino Sismico Italiano INGV 93911051
Reviewed
Rev100 		ML 1.1 2021-07-21
03:36:26		 44.4872 7.3178 1 2021-07-21
03:42:46		 Sala Sismica INGV-Roma 93005081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-21 03:36:25 ± 0.09
Latitude 44.4587 ± 0.0081
Longitude 7.2105 ± 0.0126
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 93911051

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 935
Semi-minor axis of confidence ellipse (meter) 834
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 49
Circular confidence region, given by single value of horizontal uncertainty (meter) 940.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 146
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.82198
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 93911051
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-05 15:08:51

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 93005081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-21 03:42:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SACS.HHZ. 2021-07-21T03:38:12.07 3.0 undecidable manual S 3.35 0
IV.CSNT.HHZ. 2021-07-21T03:38:06.75 3.0 undecidable manual Sg 7.85 0
MN.TRI.HHZ. 2021-07-21T03:38:01.31 3.0 negative manual P 2.209 0
IV.VOBA.EHZ. 2021-07-21T03:37:48.93 3.0 undecidable manual Sg -0.43 0
GU.GRAM.HHZ. 2021-07-21T03:37:35.30 3.0 undecidable manual Sg 0.04 0
IV.SACS.HHZ. 2021-07-21T03:37:32.45 3.0 undecidable manual P 7.14 0
GU.CANO.HHZ. 2021-07-21T03:36:51.20 0.6 undecidable manual S 109 86.1471 93 -0.22 43
MN.BNI.HHN. 2021-07-21T03:36:48.63 0.6 undecidable manual S 328 78.0663 93 -0.65 38
GU.RORO.HHE. 2021-07-21T03:36:48.93 0.6 undecidable manual S 119 78.0663 93 -0.36 43
GU.MGRO.HHN. 2021-07-21T03:36:45.72 0.6 undecidable manual S 134 66.1893 94 -0.41 44
GU.RRL.HHE. 2021-07-21T03:36:44.33 0.6 undecidable manual S 327 61.0944 94 -0.43 43
FR.SAOF.HHE.00 2021-07-21T03:36:43.68 0.6 undecidable manual S 152 59.0964 95 -0.55 43
GU.GBOS.HHZ. 2021-07-21T03:36:42.90 0.6 undecidable manual S 116 55.4001 95 -0.35 45
IV.QLNO.HHZ. 2021-07-21T03:36:42.04 0.3 undecidable manual P 99 91.242 93 0.59 59
GU.CANO.HHZ. 2021-07-21T03:36:41.01 0.1 undecidable manual P 109 86.1471 93 0.35 85
GU.RORO.HHE. 2021-07-21T03:36:39.59 0.1 undecidable manual P 119 78.0663 93 0.16 89
MN.BNI.HHN. 2021-07-21T03:36:39.97 0.3 undecidable manual P 328 78.0663 93 0.55 62
GU.BHB.HHZ. 2021-07-21T03:36:38.81 0.6 undecidable manual S 6 42.0246 97 -0.88 36
GU.MGRO.HHN. 2021-07-21T03:36:37.74 0.3 undecidable manual P 134 66.1893 94 0.14 69
GU.RRL.HHE. 2021-07-21T03:36:37.08 0.1 undecidable manual P 327 61.0944 94 0.27 91
FR.SAOF.HHE.00 2021-07-21T03:36:36.76 0.3 undecidable manual P 152 59.0964 95 0.25 68
GU.ENR.HHZ. 2021-07-21T03:36:36.16 0.3 undecidable manual S 147 30.3474 102 -0.45 69
GU.GBOS.HHZ. 2021-07-21T03:36:36.20 0.1 undecidable manual P 116 55.4001 95 0.25 92
GU.STV.HHZ. 2021-07-21T03:36:34.77 0.3 undecidable manual S 159 25.4523 106 -0.57 68
GU.BHB.HHZ. 2021-07-21T03:36:33.77 0.1 undecidable manual P 6 42.0246 97 -0.12 95
GU.ENR.HHZ. 2021-07-21T03:36:32.27 0.1 undecidable manual P 147 30.3474 102 0.16 97
GU.STV.HHZ. 2021-07-21T03:36:31.51 0.1 undecidable manual P 159 25.4523 106 0.13 99
GU.PZZ.HHZ. 2021-07-21T03:36:31.48 0.3 undecidable manual S 305 9.1797 141 -0.16 75
GU.PZZ.HHZ. 2021-07-21T03:36:29.49 0.1 negative manual P 305 9.1797 141 0.25 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.PZZ.HHE. ML:1.6 0.00036250000000000003 0.08 AML other m 2021-07-21T03:36:31.78
GU.PZZ.HHN. ML:1.5 0.00034050000000000004 0.06 AML other m 2021-07-21T03:36:31.85
GU.STV.HHN. ML:0.9 0.000045650000000000005 1.82 AML other m 2021-07-21T03:36:35.03
GU.STV.HHE. ML:0.9 0.000046700000000000003 0.1 AML other m 2021-07-21T03:36:35.02
GU.ENR.HHN. ML:1.4 0.0001023 0.06 AML other m 2021-07-21T03:36:36.39
GU.ENR.HHE. ML:1.3 0.0000856 0.74 AML other m 2021-07-21T03:36:37.40
GU.BHB.HHN. ML:0.9 0.0000234 0.22 AML other m 2021-07-21T03:36:39.17
GU.BHB.HHE. ML:0.9 0.0000235 1.1 AML other m 2021-07-21T03:36:39.76
GU.GBOS.HHN. ML:1.0 0.00002045 0.3 AML other m 2021-07-21T03:36:43.16
GU.GBOS.HHE. ML:1.0 0.0000235 0.2 AML other m 2021-07-21T03:36:43.18
GU.CANO.HHN. ML:1.2 0.00002045 0.18 AML other m 2021-07-21T03:36:52.77
GU.CANO.HHE. ML:1.3 0.00002265 0.66 AML other m 2021-07-21T03:36:52.81
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