Earthquake with magnitude of ML 0.9 on date 27-10-2021 and time 09:07:25 (UTC) in region 2 km SW Valmala (CN)

A magnitude ML 0.9 earthquake occured in region: 2 km SW Valmala (CN), on

  • 27-10-2021 09:07:25 (UTC)
  • 27-10-2021 11:07:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.532, 7.333 at 5 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
Valmala CN 2 52 52
Melle CN 4 292 344
Brossasco CN 5 1084 1428
Venasca CN 6 1437 2865
Roccabruna CN 6 1585 4450
Frassino CN 6 265 4715
Villar San Costanzo CN 7 1547 6262
Cartignano CN 7 190 6452
Isasca CN 7 76 6528
Dronero CN 8 7035 13563
San Damiano Macra CN 8 430 13993
Rossana CN 8 908 14901
Brondello CN 10 290 15191
Piasco CN 11 2774 17965
Martiniana Po CN 11 734 18699
Montemale di Cuneo CN 11 241 18940
Gambasca CN 11 371 19311
Busca CN 11 10181 29492
Pagno CN 12 585 30077
Macra CN 13 59 30136
Sampeyre CN 13 1022 31158
Costigliole Saluzzo CN 13 3375 34533
Sanfront CN 13 2395 36928
Castellar CN 13 295 37223
Pradleves CN 13 250 37473
Celle di Macra CN 13 100 37573
Rifreddo CN 13 1078 38651
Monterosso Grana CN 14 505 39156
Valgrana CN 14 786 39942
Verzuolo CN 14 6459 46401
Revello CN 15 4262 50663
Caraglio CN 15 6836 57499
Manta CN 15 3787 61286
Villafalletto CN 17 2925 64211
Stroppo CN 17 103 64314
Castelmagno CN 17 66 64380
Envie CN 17 2074 66454
Tarantasca CN 17 2122 68576
Paesana CN 18 2784 71360
Bernezzo CN 18 4104 75464
Saluzzo CN 18 16960 92424
Elva CN 19 97 92521
Cervasca CN 20 5013 97534
Oncino CN 20 76 97610
Vottignasco CN 20 537 98147

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NW of Cuneo (56081 inhabitants)
59 Km SW of Moncalieri (57294 inhabitants)
66 Km SW of Torino (890529 inhabitants)
80 Km SW of Asti (76202 inhabitants)
87 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 0.9 2021-10-27
09:07:25
44.532 7.3332 5 2021-10-27
09:14:12
Sala Sismica INGV-Roma 97018231
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-27 09:07:25 ± 0.19
Latitude 44.5320 ± 0.0081
Longitude 7.3332 ± 0.0202
Depth (km) 5 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97018231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1454
Semi-minor axis of confidence ellipse (meter) 939
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 254
Circular confidence region, given by single value of horizontal uncertainty (meter) 1450
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 138
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.45
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.54769
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 97018231
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-27 09:14:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CADC.EHZ. 2021-10-27T09:08:05.51 3.0 undecidable manual Pn 1.87 0
GU.GBOS.HHZ. 2021-10-27T09:07:42.98 0.3 undecidable manual S 129 0.4641 50 -0.2 75
GU.BHB.HHZ. 2021-10-27T09:07:37.08 0.3 undecidable manual S 351 0.3076 99 -0.6 70
GU.ENR.HHZ. 2021-10-27T09:07:37.27 0.3 undecidable manual S 169 0.3085 99 -0.45 73
GU.GBOS.HHZ. 2021-10-27T09:07:36.30 0.3 undecidable manual P 129 0.4641 50 0.51 70
GU.STV.HHZ. 2021-10-27T09:07:36.27 0.3 undecidable manual S 181 0.2869 99 -0.63 69
GU.RRL.HHE. 2021-10-27T09:07:36.84 0.3 undecidable manual P 315 0.5477 50 -0.39 71
GU.STV.HHZ. 2021-10-27T09:07:32.53 0.1 undecidable manual P 181 0.2869 99 0.37 100
GU.BHB.HHZ. 2021-10-27T09:07:32.98 0.3 undecidable manual P 351 0.3076 99 0.36 75
GU.ENR.HHZ. 2021-10-27T09:07:32.99 0.3 undecidable manual P 169 0.3085 99 0.35 75
GU.PZZ.HHZ. 2021-10-27T09:07:31.84 0.3 undecidable manual S 261 0.1574 107 -0.18 80
GU.PZZ.HHZ. 2021-10-27T09:07:29.84 0.1 undecidable manual P 261 0.1574 107 0.49 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.PZZ.HHN. ML:1.4 0.0002362373 0.16 AML other m 2021-10-27T09:07:31.97
GU.PZZ.HHE. ML:1.4 0.00021787125 0.1408 AML other m 2021-10-27T09:07:32.43
GU.STV.HHN. ML:0.7 2.70908037E-5 0.096 AML other m 2021-10-27T09:07:36.64
GU.ENR.HHE. ML:1.1 6.2E-5 0.16 AML other m 2021-10-27T09:07:37.41
GU.STV.HHE. ML:0.8 2.97651395E-5 0.096 AML other m 2021-10-27T09:07:36.64
GU.ENR.HHN. ML:1.1 4.9147962E-5 0.1408 AML other m 2021-10-27T09:07:38.43
GU.BHB.HHE. ML:0.5 1.66158E-5 0.1408 AML other m 2021-10-27T09:07:37.09
GU.BHB.HHN. ML:0.4 1.1520866E-5 0.16 AML other m 2021-10-27T09:07:37.25
GU.GBOS.HHE. ML:0.8 1.393255E-5 0.1792 AML other m 2021-10-27T09:07:43.33
GU.GBOS.HHN. ML:0.6 1.2335398E-5 0.1408 AML other m 2021-10-27T09:07:43.27
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