Earthquake with magnitude of ML 1.0 on date 28-10-2021 and time 20:37:50 (UTC) in region 4 km NW Roccabruna (CN)

A magnitude ML 1.0 earthquake occured in region: 4 km NW Roccabruna (CN), on

  • 28-10-2021 20:37:50 (UTC)
  • 28-10-2021 22:37:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.509, 7.325 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 4 1585 1585
Valmala CN 4 52 1637
Cartignano CN 5 190 1827
Villar San Costanzo CN 5 1547 3374
Dronero CN 6 7035 10409
San Damiano Macra CN 6 430 10839
Melle CN 6 292 11131
Brossasco CN 8 1084 12215
Frassino CN 8 265 12480
Venasca CN 8 1437 13917
Montemale di Cuneo CN 9 241 14158
Rossana CN 9 908 15066
Isasca CN 10 76 15142
Pradleves CN 11 250 15392
Monterosso Grana CN 11 505 15897
Macra CN 12 59 15956
Celle di Macra CN 12 100 16056
Busca CN 12 10181 26237
Valgrana CN 12 786 27023
Brondello CN 12 290 27313
Piasco CN 13 2774 30087
Caraglio CN 13 6836 36923
Sampeyre CN 13 1022 37945
Martiniana Po CN 14 734 38679
Gambasca CN 14 371 39050
Castelmagno CN 14 66 39116
Costigliole Saluzzo CN 14 3375 42491
Pagno CN 14 585 43076
Sanfront CN 15 2395 45471
Castellar CN 15 295 45766
Stroppo CN 16 103 45869
Rifreddo CN 16 1078 46947
Bernezzo CN 16 4104 51051
Verzuolo CN 16 6459 57510
Revello CN 17 4262 61772
Manta CN 17 3787 65559
Villafalletto CN 18 2925 68484
Tarantasca CN 18 2122 70606
Cervasca CN 18 5013 75619
Rittana CN 19 109 75728
Elva CN 19 97 75825
Marmora CN 19 68 75893
Valloriate CN 19 109 76002
Envie CN 20 2074 78076
Paesana CN 20 2784 80860

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NW of Cuneo (56081 inhabitants)
62 Km SW of Moncalieri (57294 inhabitants)
69 Km SW of Torino (890529 inhabitants)
82 Km SW of Asti (76202 inhabitants)
85 Km NW of Sanremo (54807 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.0 2021-10-28
20:37:50
44.5093 7.3252 1 2021-10-28
20:45:34
Sala Sismica INGV-Roma 97046941
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-28 20:37:50 ± 0.19
Latitude 44.5093 ± 0.0081
Longitude 7.3252 ± 0.0126
Depth (km) 1 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97046941

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1159
Semi-minor axis of confidence ellipse (meter) 720
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 56
Circular confidence region, given by single value of horizontal uncertainty (meter) 1160
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.45506
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 97046941
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-28 20:45:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.SAOF.HHZ. 2021-10-28T20:38:09.06 3.0 undecidable manual S 0
GU.GBOS.HHZ. 2021-10-28T20:38:07.84 0.6 undecidable manual S 126 0.4551 91 -0.5 45
GU.BHB.HHZ. 2021-10-28T20:38:02.90 0.6 undecidable manual S 352 0.3292 92 -0.61 44
GU.GBOS.HHZ. 2021-10-28T20:38:01.43 1.0 negative manual P 126 0.4551 91 0.49 23
GU.ENR.HHZ. 2021-10-28T20:38:01.88 0.3 undecidable manual S 167 0.2878 92 -0.03 77
GU.STV.HHZ. 2021-10-28T20:38:00.43 0.3 undecidable manual S 180 0.2644 92 -0.58 68
GU.SAOF.HHZ.00 2021-10-28T20:38:00.26 3.0 undecidable manual P 0
GU.BHB.HHZ. 2021-10-28T20:37:58.32 0.3 negative manual P 352 0.3292 92 0.17 74
GU.STV.HHZ. 2021-10-28T20:37:57.03 0.6 positive manual P 180 0.2644 92 0.32 48
GU.ENR.HHZ. 2021-10-28T20:37:57.66 0.1 undecidable manual P 167 0.2878 92 0.43 94
GU.PZZ.HHZ. 2021-10-28T20:37:56.31 0.1 undecidable manual S 269 0.1493 94 -0.28 100
GU.PZZ.HHZ. 2021-10-28T20:37:54.56 0.1 negative manual P 269 0.1493 94 0.4 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.PZZ.HHN. ML:1.3 0.000207 0.12 AML other m 2021-10-28T20:37:56.55
GU.PZZ.HHE. ML:1.2 0.000182 0.56 AML other m 2021-10-28T20:37:56.89
GU.ENR.HHE. ML:0.7 2.487277E-5 0.1152 AML other m 2021-10-28T20:38:01.99
GU.ENR.HHN. ML:0.7 2.6009635E-5 0.512 AML other m 2021-10-28T20:38:02.25
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