Earthquake with magnitude of ML 1.1 on date 23-07-2021 and time 02:18:25 (Italy) in region 4 km NE Castelmagno (CN)

A magnitude ML 1.1 earthquake occured in region: 4 km NE Castelmagno (CN), on

  • 23-07-2021 00:18:25 (UTC)
  • 23-07-2021 02:18:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.447, 7.234 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
Castelmagno CN 4 66 66
Pradleves CN 5 250 316
San Damiano Macra CN 5 430 746
Cartignano CN 6 190 936
Celle di Macra CN 6 100 1036
Macra CN 7 59 1095
Monterosso Grana CN 8 505 1600
Roccabruna CN 9 1585 3185
Dronero CN 11 7035 10220
Stroppo CN 11 103 10323
Marmora CN 11 68 10391
Montemale di Cuneo CN 11 241 10632
Canosio CN 12 80 10712
Villar San Costanzo CN 12 1547 12259
Valgrana CN 12 786 13045
Valmala CN 14 52 13097
Frassino CN 14 265 13362
Melle CN 15 292 13654
Prazzo CN 15 170 13824
Aisone CN 15 248 14072
Sampeyre CN 15 1022 15094
Demonte CN 15 2003 17097
Elva CN 16 97 17194
Caraglio CN 16 6836 24030
Vinadio CN 16 644 24674
Valloriate CN 16 109 24783
Rittana CN 17 109 24892
Brossasco CN 17 1084 25976
Sambuco CN 17 92 26068
Bernezzo CN 17 4104 30172
Venasca CN 18 1437 31609
Gaiola CN 19 582 32191
Moiola CN 19 234 32425
Rossana CN 19 908 33333
Acceglio CN 20 162 33495
Pietraporzio CN 20 77 33572
Isasca CN 20 76 33648
Cervasca CN 20 5013 38661

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km W of Cuneo (56081 inhabitants)
71 Km SW of Moncalieri (57294 inhabitants)
78 Km SW of Torino (890529 inhabitants)
82 Km NW of Sanremo (54807 inhabitants)
92 Km SW 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 1.1 2021-07-23
00:18:25
44.4467 7.2342 14 2021-07-23
00:24:57
Sala Sismica INGV-Roma 93087381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-23 00:18:25 ± 0.14
Latitude 44.4467 ± 0.0090
Longitude 7.2342 ± 0.0151
Depth (km) 14 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93087381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1419
Semi-minor axis of confidence ellipse (meter) 208
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 232
Circular confidence region, given by single value of horizontal uncertainty (meter) 1420
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 143
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.93979
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 93087381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-23 00:24:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SGAL.EHZ. 2021-07-23T00:19:41.36 3.0 undecidable manual Sn 5.4 0
IV.LMD.HHZ. 2021-07-23T00:19:23.65 3.0 undecidable manual Pg 7.41 0
GU.RORO.HHZ. 2021-07-23T00:18:48.36 0.3 undecidable manual S 119 0.6826 93 -0.34 64
GU.MGRO.HHZ. 2021-07-23T00:18:45.40 0.6 undecidable manual S 134 0.5765 94 -0.14 46
GU.RRL.HHE. 2021-07-23T00:18:44.76 0.6 undecidable manual S 327 0.5693 94 -0.59 41
GU.PCP.HHZ. 2021-07-23T00:18:44.10 0.6 undecidable manual P 84 0.9398 92 0.61 38
GU.GBOS.HHZ. 2021-07-23T00:18:42.09 0.3 undecidable manual S 115 0.4793 94 -0.58 63
FR.SAOF.HHE. 2021-07-23T00:18:42.98 0.6 undecidable manual S 154 0.5135 94 -0.72 39
IV.QLNO.HHZ. 2021-07-23T00:18:41.67 0.6 positive manual P 98 0.8031 92 0.51 40
GU.IMI.HHZ. 2021-07-23T00:18:40.19 1.0 undecidable manual P 138 0.7141 93 0.55 20
GU.RSP.HHZ. 2021-07-23T00:18:40.03 0.6 negative manual P 2 0.7015 93 0.61 40
GU.CANO.HHZ. 2021-07-23T00:18:40.48 0.6 positive manual P 108 0.7554 93 0.13 44
GU.RORO.HHZ. 2021-07-23T00:18:39.11 0.6 undecidable manual P 119 0.6826 93 0.01 46
GU.RRL.HHE. 2021-07-23T00:18:37.38 0.1 undecidable manual P 327 0.5693 94 0.21 91
GU.MGRO.HHZ. 2021-07-23T00:18:37.54 0.6 positive manual P 134 0.5765 94 0.26 45
FR.SAOF.HHE. 2021-07-23T00:18:36.47 0.1 undecidable manual P 154 0.5135 94 0.25 91
GU.ENR.HHZ. 2021-07-23T00:18:35.95 0.3 undecidable manual S 149 0.2536 101 -0.1 73
GU.GBOS.HHZ. 2021-07-23T00:18:35.60 0.6 negative manual P 115 0.4793 94 -0.02 48
GU.STV.HHZ. 2021-07-23T00:18:34.49 0.6 undecidable manual S 162 0.2122 106 -0.35 47
GU.BHB.HHZ. 2021-07-23T00:18:33.33 0.3 undecidable manual P 3 0.3894 96 -0.76 59
GU.STV.HHZ. 2021-07-23T00:18:31.34 0.3 negative manual P 162 0.2122 106 0.24 73
GU.ENR.HHZ. 2021-07-23T00:18:31.97 0.1 undecidable manual P 149 0.2536 101 0.17 97
GU.PZZ.HHZ. 2021-07-23T00:18:31.74 0.6 undecidable manual S 305 0.1034 131 -0.25 48
GU.PZZ.HHZ. 2021-07-23T00:18:29.65 0.1 negative manual P 305 0.1034 131 0.2 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.PZZ.HHN. ML:1.6 0.0003745 1.92 AML other m 2021-07-23T00:18:31.97
GU.PZZ.HHE. ML:1.7 0.000435 1.68 AML other m 2021-07-23T00:18:32.94
GU.STV.HHN. ML:0.8 3.69E-5 0.08 AML other m 2021-07-23T00:18:34.62
GU.STV.HHE. ML:1 5.34E-5 0.24 AML other m 2021-07-23T00:18:34.53
GU.ENR.HHN. ML:1.3 9.825E-5 1.04 AML other m 2021-07-23T00:18:35.82
GU.ENR.HHE. ML:1.4 0.0001166 1.26 AML other m 2021-07-23T00:18:35.84
GU.GBOS.HHN. ML:0.9 1.905E-5 0.98 AML other m 2021-07-23T00:18:42.09
GU.GBOS.HHE. ML:0.9 2.03E-5 0.18 AML other m 2021-07-23T00:18:42.29
GU.RSP.HHN. ML:0.8 8.575E-6 1.58 AML other m 2021-07-23T00:18:47.99
GU.RSP.HHE. ML:0.8 8.665E-6 0.72 AML other m 2021-07-23T00:18:48.86
GU.IMI.HHN. ML:1.2 2.19E-5 1.42 AML other m 2021-07-23T00:18:50.94
GU.IMI.HHE. ML:1.2 1.945E-5 0.64 AML other m 2021-07-23T00:18:51.41
GU.CANO.HHE. ML:1.6 4.95E-5 1.16 AML other m 2021-07-23T00:18:51.33
GU.CANO.HHN. ML:1.1 1.575E-5 1.46 AML other m 2021-07-23T00:18:53.94
GU.PCP.HHE. ML:1 1.1775E-5 0.74 AML other m 2021-07-23T00:18:57.59
GU.PCP.HHN. ML:1.2 1.53E-5 0.44 AML other m 2021-07-23T00:18:58.49
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