Earthquake with magnitude of ML 0.8 on date 20-10-2021 and time 08:52:09 (UTC) in region 4 km E Casteldelfino (CN)

A magnitude ML 0.8 earthquake occured in region: 4 km E Casteldelfino (CN), on

  • 20-10-2021 08:52:09 (UTC)
  • 20-10-2021 10:52:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.606, 7.121 at 14 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
Casteldelfino CN 4 157 157
Sampeyre CN 6 1022 1179
Pontechianale CN 8 179 1358
Elva CN 8 97 1455
Bellino CN 9 109 1564
Oncino CN 10 76 1640
Crissolo CN 11 168 1808
Stroppo CN 11 103 1911
Ostana CN 11 83 1994
Macra CN 13 59 2053
Frassino CN 13 265 2318
Celle di Macra CN 14 100 2418
Prazzo CN 15 170 2588
Paesana CN 15 2784 5372
Sanfront CN 17 2395 7767
Marmora CN 17 68 7835
Melle CN 17 292 8127
Canosio CN 17 80 8207
San Damiano Macra CN 17 430 8637
Acceglio CN 18 162 8799
Gambasca CN 18 371 9170
Rifreddo CN 19 1078 10248
Valmala CN 19 52 10300
Brossasco CN 20 1084 11384
Cartignano CN 20 190 11574
Martiniana Po CN 20 734 12308

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km NW of Cuneo (56081 inhabitants)
63 Km SW of Moncalieri (57294 inhabitants)
68 Km SW of Torino (890529 inhabitants)
92 Km W of Asti (76202 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 0.8 2021-10-20
08:52:09
44.6058 7.1207 14 2021-10-20
08:56:41
Sala Sismica INGV-Roma 96795701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 08:52:09 ± 0.28
Latitude 44.6058 ± 0.0144
Longitude 7.1207 ± 0.0227
Depth (km) 14 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96795701

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1623
Semi-minor axis of confidence ellipse (meter) 1549
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 215
Circular confidence region, given by single value of horizontal uncertainty (meter) 1620
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 141
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.09893
Epicentral distance of station farthest from the epicenter (degree) 0.55128
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 96795701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 08:56:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.STV.HHZ. 2021-10-20T08:52:22.98 0.6 undecidable manual S 158 0.3894 96 -0.45 45
GU.RRL.HHZ. 2021-10-20T08:52:22.87 0.6 undecidable manual S 323 0.393 96 -0.66 42
GU.RSP.HNZ. 2021-10-20T08:52:20.62 0.1 undecidable manual P 11 0.5513 94 0.35 90
GU.BHB.HHZ. 2021-10-20T08:52:18.83 0.6 undecidable manual S 24 0.2509 101 -0.53 44
GU.RRL.HHZ. 2021-10-20T08:52:17.78 0.6 undecidable manual P 323 0.393 96 0.22 47
GU.STV.HHZ. 2021-10-20T08:52:17.90 1.0 positive manual P 158 0.3894 96 0.4 23
GU.BHB.HHZ. 2021-10-20T08:52:15.27 0.1 negative manual P 24 0.2509 101 0.12 100
GU.PZZ.HHZ. 2021-10-20T08:52:14.95 0.6 undecidable manual S 182 0.0989 132 -0.32 50
GU.PZZ.HHZ. 2021-10-20T08:52:13.02 0.1 negative manual P 182 0.0989 132 0.23 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.PZZ.HHE. ML:1 9.8735275E-5 0.16 AML other m 2021-10-20T08:52:15.30
GU.PZZ.HHN. ML:0.9 8.344905E-5 0.1216 AML other m 2021-10-20T08:52:15.10
GU.BHB.HNE. ML:0.8 3.5740385E-5 1.1392 AML other m 2021-10-20T08:52:27.14
GU.BHB.HNN. ML:0.7 2.409657E-5 0.6272 AML other m 2021-10-20T08:52:25.17
GU.BHB.HHE. ML:0.3 1.0630649E-5 0.0768 AML other m 2021-10-20T08:52:19.98
GU.BHB.HHN. ML:0.3 1.1639666E-5 0.1216 AML other m 2021-10-20T08:52:20.28
GU.RRL.HHE. ML:1 3.2390325E-5 2.0992 AML other m 2021-10-20T08:52:21.08
GU.RRL.HHN. ML:1.1 3.6087355E-5 2.5792 AML other m 2021-10-20T08:52:31.96
GU.STV.HHE. ML:0.2 7.209856675E-6 0.1024 AML other m 2021-10-20T08:52:23.98
GU.STV.HHN. ML:0.8 1.8865845E-5 1.7792 AML other m 2021-10-20T08:52:21.29
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