Earthquake with magnitude of ML 1.1 on date 21-07-2021 and time 05:36:26 (Italy) in region 2 km W Roccabruna (CN)

A magnitude ML 1.1 earthquake occured in region: 2 km W Roccabruna (CN), on

  • 21-07-2021 03:36:26 (UTC)
  • 21-07-2021 05:36:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.487, 7.318 at 1 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Roccabruna CN 2 1585 1585
Cartignano CN 3 190 1775
Dronero CN 4 7035 8810
San Damiano Macra CN 5 430 9240
Villar San Costanzo CN 5 1547 10787
Valmala CN 7 52 10839
Montemale di Cuneo CN 7 241 11080
Pradleves CN 8 250 11330
Melle CN 8 292 11622
Monterosso Grana CN 9 505 12127
Valgrana CN 10 786 12913
Frassino CN 10 265 13178
Brossasco CN 10 1084 14262
Venasca CN 11 1437 15699
Celle di Macra CN 11 100 15799
Macra CN 11 59 15858
Rossana CN 11 908 16766
Caraglio CN 12 6836 23602
Castelmagno CN 12 66 23668
Isasca CN 12 76 23744
Busca CN 13 10181 33925
Bernezzo CN 14 4104 38029
Piasco CN 14 2774 40803
Brondello CN 15 290 41093
Sampeyre CN 15 1022 42115
Stroppo CN 15 103 42218
Costigliole Saluzzo CN 16 3375 45593
Gambasca CN 16 371 45964
Martiniana Po CN 16 734 46698
Rittana CN 17 109 46807
Cervasca CN 17 5013 51820
Pagno CN 17 585 52405
Valloriate CN 17 109 52514
Castellar CN 18 295 52809
Sanfront CN 18 2395 55204
Marmora CN 18 68 55272
Tarantasca CN 18 2122 57394
Verzuolo CN 18 6459 63853
Gaiola CN 18 582 64435
Rifreddo CN 18 1078 65513
Vignolo CN 19 2600 68113
Villafalletto CN 19 2925 71038
Roccasparvera CN 19 741 71779
Canosio CN 19 80 71859
Elva CN 19 97 71956
Demonte CN 19 2003 73959
Moiola CN 19 234 74193
Manta CN 20 3787 77980
Revello CN 20 4262 82242

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km W of Cuneo (56081 inhabitants)
64 Km SW of Moncalieri (57294 inhabitants)
71 Km SW of Torino (890529 inhabitants)
83 Km NW of Sanremo (54807 inhabitants)
84 Km SW of Asti (76202 inhabitants)
95 Km W of Savona (61345 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
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 03:36:26 ± 0.13
Latitude 44.4872 ± 0.0063
Longitude 7.3178 ± 0.0113
Depth (km) 1 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93005081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 813
Semi-minor axis of confidence ellipse (meter) 686
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) 810
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.75183
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 7
Magnitude information

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 Takeoff_angle Residual Weight
IV.SACS.HHZ. 2021-07-21T03:38:12.07 3.0 undecidable manual Sn -1.75 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 Pg 24.15 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 Pg 11.89 0
GU.CANO.HHZ. 2021-07-21T03:36:50.97 0.6 undecidable manual S 113 0.7141 50 -0.85 36
IV.QLNO.HHZ. 2021-07-21T03:36:42.04 0.1 undecidable manual P 102 0.7518 50 0.48 83
GU.GBOS.HHZ. 2021-07-21T03:36:42.90 0.6 undecidable manual S 123 0.4461 91 -0.31 46
GU.CANO.HHZ. 2021-07-21T03:36:41.01 0.1 undecidable manual P 113 0.7141 50 0.1 91
GU.BHB.HHZ. 2021-07-21T03:36:38.81 0.6 undecidable manual S 354 0.3507 92 -0.7 41
GU.GBOS.HHZ. 2021-07-21T03:36:36.20 0.1 undecidable manual P 123 0.4461 91 0.26 93
GU.ENR.HHZ. 2021-07-21T03:36:36.16 0.3 undecidable manual S 164 0.2671 92 -0.16 74
GU.STV.HHZ. 2021-07-21T03:36:34.77 0.3 undecidable manual S 179 0.2419 92 -0.57 67
GU.BHB.HHZ. 2021-07-21T03:36:33.77 0.1 undecidable manual P 354 0.3507 92 -0.03 99
GU.ENR.HHZ. 2021-07-21T03:36:32.27 0.1 undecidable manual P 164 0.2671 92 0.31 95
GU.STV.HHZ. 2021-07-21T03:36:31.51 0.1 undecidable manual P 179 0.2419 92 0.12 100
GU.PZZ.HHZ. 2021-07-21T03:36:31.48 0.3 undecidable manual S 278 0.1457 94 -0.14 75
GU.PZZ.HHZ. 2021-07-21T03:36:29.49 0.1 negative manual P 278 0.1457 94 0.24 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.PZZ.HHE. ML:1.5 0.0003625 0.08 AML other m 2021-07-21T03:36:31.78
GU.PZZ.HHN. ML:1.5 0.0003405 0.06 AML other m 2021-07-21T03:36:31.85
GU.STV.HHN. ML:0.9 4.565E-5 1.82 AML other m 2021-07-21T03:36:35.03
GU.STV.HHE. ML:0.9 4.67E-5 0.1 AML other m 2021-07-21T03:36:35.02
GU.ENR.HHN. ML:1.3 0.0001023 0.06 AML other m 2021-07-21T03:36:36.39
GU.ENR.HHE. ML:1.2 8.56E-5 0.74 AML other m 2021-07-21T03:36:37.40
GU.BHB.HHN. ML:0.8 2.34E-5 0.22 AML other m 2021-07-21T03:36:39.17
GU.BHB.HHE. ML:0.8 2.35E-5 1.1 AML other m 2021-07-21T03:36:39.76
GU.GBOS.HHN. ML:0.9 2.045E-5 0.3 AML other m 2021-07-21T03:36:43.16
GU.GBOS.HHE. ML:1 2.35E-5 0.2 AML other m 2021-07-21T03:36:43.18
GU.CANO.HHN. ML:1.2 2.045E-5 0.18 AML other m 2021-07-21T03:36:52.77
GU.CANO.HHE. ML:1.2 2.265E-5 0.66 AML other m 2021-07-21T03:36:52.81
GU.GRAM.HHE. ML:2.5 8.185E-5 0.7 AML other m 2021-07-21T03:37:38.59
GU.GRAM.HHN. ML:2.7 0.0001265 0.04 AML other m 2021-07-21T03:37:38.75
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