Earthquake with magnitude of ML 1.6 on date 20-10-2021 and time 07:07:06 (Italy) in region 2 km W Urbe (SV)

A magnitude ML 1.6 earthquake occured in region: 2 km W Urbe (SV), on

  • 20-10-2021 05:07:06 (UTC)
  • 20-10-2021 07:07:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.492, 8.563 at 8 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
Urbe SV 2 700 700
Sassello SV 6 1777 2477
Tiglieto GE 6 546 3023
Pontinvrea SV 11 847 3870
Rossiglione GE 12 2779 6649
Stella SV 12 3009 9658
Masone GE 12 3679 13337
Campo Ligure GE 12 2955 16292
Mioglia SV 12 526 16818
Cassinelle AL 13 914 17732
Cogoleto GE 13 9172 26904
Morbello AL 13 402 27306
Ponzone AL 13 1051 28357
Arenzano GE 14 11519 39876
Malvicino AL 14 85 39961
Giusvalla SV 14 441 40402
Pareto AL 15 554 40956
Varazze SV 15 13251 54207
Molare AL 15 2181 56388
Mele GE 16 2725 59113
Cartosio AL 16 747 59860
Cremolino AL 16 1086 60946
Grognardo AL 16 259 61205
Celle Ligure SV 17 5237 66442
Belforte Monferrato AL 17 515 66957
Prasco AL 17 521 67478
Albisola Superiore SV 17 10163 77641
Ovada AL 18 11477 89118
Cavatore AL 18 291 89409
Tagliolo Monferrato AL 19 1581 90990
Montechiaro d'Acqui AL 19 560 91550
Albissola Marina SV 19 5487 97037
Spigno Monferrato AL 19 1050 98087
Trisobbio AL 19 655 98742
Morsasco AL 19 679 99421
Visone AL 20 1194 100615
Lerma AL 20 869 101484
Castelletto d'Erro AL 20 148 101632

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km NE of Savona (61345 inhabitants)
31 Km W of Genova (586655 inhabitants)
47 Km S of Alessandria (93943 inhabitants)
54 Km SE of Asti (76202 inhabitants)
81 Km E of Cuneo (56081 inhabitants)
90 Km SE of Moncalieri (57294 inhabitants)
90 Km SW of Pavia (72576 inhabitants)
95 Km S of Vigevano (63310 inhabitants)
95 Km SE of Torino (890529 inhabitants)
97 Km NE of Sanremo (54807 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 1.6 2021-10-20
05:07:06
44.492 8.5632 8 2021-10-20
05:16:24
Sala Sismica INGV-Roma 96786361
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 05:07:06 ± 0.12
Latitude 44.4920 ± 0.0072
Longitude 8.5632 ± 0.0101
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96786361

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 869
Semi-minor axis of confidence ellipse (meter) 632
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 331
Circular confidence region, given by single value of horizontal uncertainty (meter) 870
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 25
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) 1.03152
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 96786361
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 05:16:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ARRO.EHZ. 2021-10-20T05:09:03.13 3.0 undecidable manual Sg 14.5 0
IV.GRIS.EHZ. 2021-10-20T05:08:53.52 3.0 positive manual Pn 0.05 0
IV.APEC.HHZ. 2021-10-20T05:08:42.35 3.0 undecidable manual Sg 10.13 0
IV.RMP.HHZ. 2021-10-20T05:08:20.01 3.0 positive manual Pg 10.03 0
CH.BERNI.HHZ. 2021-10-20T05:08:17.07 3.0 undecidable manual Sg 4.25 0
IV.SRES.HHZ. 2021-10-20T05:08:10.97 3.0 negative manual Pg 6.33 0
IV.VENL.EHZ. 2021-10-20T05:08:00.42 3.0 negative manual Pg 6.89 0
IV.MMUR.HNZ. 2021-10-20T05:08:00.57 3.0 undecidable manual Pn -0.12 0
IV.IMOL.HNZ. 2021-10-20T05:07:47.22 3.0 positive manual Pn 1.51 0
GU.PZZ.HHZ. 2021-10-20T05:07:40.71 1.0 undecidable manual S 271 1.0315 50 0.17 20
IV.FIR.HHZ. 2021-10-20T05:07:40.58 3.0 undecidable manual Pn -2.23 0
IV.ZEN8.EHZ. 2021-10-20T05:07:39.07 3.0 undecidable manual Pn -1.37 0
GU.BHB.HHZ. 2021-10-20T05:07:38.40 0.3 undecidable manual S 291 0.9857 50 -0.78 51
GU.STV.HHZ. 2021-10-20T05:07:36.93 0.3 undecidable manual S 255 0.9173 50 -0.22 61
IV.SARZ.HHE. 2021-10-20T05:07:34.86 0.3 undecidable manual S 0.4506 1.155 0
GU.MGRO.HHZ. 2021-10-20T05:07:30.69 0.6 undecidable manual S 231 0.7024 50 -0.1 44
IV.SARZ.HHE. 2021-10-20T05:07:29.95 0.1 undecidable manual P 0.4506 1.36 0
GU.PZZ.HHZ. 2021-10-20T05:07:26.77 0.1 undecidable manual P 271 1.0315 50 0.47 76
GU.STV.HHZ. 2021-10-20T05:07:25.13 0.1 undecidable manual P 255 0.9173 50 0.79 69
GU.BHB.HHZ. 2021-10-20T05:07:25.69 0.6 positive manual P 291 0.9857 50 0.18 41
FR.SAOF.HHZ.00 2021-10-20T05:07:25.10 0.1 undecidable manual P 235 0.8822 50 1.36 53
GU.RORO.HHZ. 2021-10-20T05:07:24.81 0.3 undecidable manual S 223 0.5198 50 -0.55 62
IV.MSSA.HHZ. 2021-10-20T05:07:21.24 0.1 undecidable manual P 104 0.7033 50 0.56 79
GU.ROTM.HHZ. 2021-10-20T05:07:21.23 0.3 undecidable manual S 337 0.3876 50 -0.21 69
GU.CANO.HHZ. 2021-10-20T05:07:20.09 0.3 undecidable manual S 219 0.3678 50 -0.77 58
GU.MGRO.HHZ. 2021-10-20T05:07:20.88 0.1 undecidable manual P 231 0.7024 50 0.21 86
GU.GBOS.HHZ. 2021-10-20T05:07:18.39 0.1 undecidable manual P 244 0.5738 50 -0.08 91
GU.RORO.HHZ. 2021-10-20T05:07:17.46 0.1 undecidable manual P 223 0.5198 50 -0.08 92
GU.RNCA.HHZ. 2021-10-20T05:07:17.52 0.3 undecidable manual S 94 0.277 105 -0.37 68
IV.QLNO.HHZ. 2021-10-20T05:07:15.91 0.3 undecidable manual S 223 0.2284 108 -0.17 72
GU.ROTM.HHZ. 2021-10-20T05:07:15.18 0.6 undecidable manual P 337 0.3876 50 -0.09 47
GU.CANO.HHZ. 2021-10-20T05:07:14.80 0.1 positive manual P 219 0.3678 50 -0.14 93
IV.QLNO.HHZ. 2021-10-20T05:07:12.37 0.1 positive manual P 223 0.2284 108 0.19 95
GU.RNCA.HHZ. 2021-10-20T05:07:12.94 0.1 undecidable manual P 94 0.277 105 -0.28 92
GU.PCP.HHZ. 2021-10-20T05:07:10.08 0.1 undecidable manual S 346 0.0513 145 -0.18 98
GU.PCP.HHZ. 2021-10-20T05:07:08.92 0.1 undecidable manual P 346 0.0513 145 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.QLNO.HHN. ML:1.2 8.78E-5 0.58 AML other m 2021-10-20T05:07:16.78
IV.QLNO.HHE. ML:1.4 0.0001335 0.74 AML other m 2021-10-20T05:07:17.50
GU.CANO.HHN. ML:1.7 0.000176 0.18 AML other m 2021-10-20T05:07:20.88
GU.ROTM.HHE. ML:2.2 0.0005385 0.58 AML other m 2021-10-20T05:07:21.45
GU.ROTM.HHN. ML:2.2 0.000461 0.24 AML other m 2021-10-20T05:07:21.40
GU.CANO.HHE. ML:1.8 0.000192 0.68 AML other m 2021-10-20T05:07:24.42
GU.RORO.HHN. ML:1.5 6.255E-5 0.16 AML other m 2021-10-20T05:07:25.59
GU.GBOS.HHN. ML:1.4 5.05E-5 1.82 AML other m 2021-10-20T05:07:25.05
GU.GBOS.HHE. ML:1.1 2.52E-5 1.16 AML other m 2021-10-20T05:07:29.68
IV.MSSA.HHE. ML:1.8 8.645E-5 0.1 AML other m 2021-10-20T05:07:32.74
GU.MGRO.HHE. ML:1.5 4.86E-5 1.52 AML other m 2021-10-20T05:07:34.89
GU.MGRO.HHN. ML:1.6 5.66E-5 0.84 AML other m 2021-10-20T05:07:34.65
IV.MSSA.HHN. ML:1.5 4.735E-5 0.86 AML other m 2021-10-20T05:07:34.50
FR.SAOF.HHN.00 ML:1.6 4.26E-5 0.8 AML other m 2021-10-20T05:07:38.40
FR.SAOF.HHE.00 ML:1.6 4.435E-5 0.32 AML other m 2021-10-20T05:07:38.68
GU.PZZ.HHE. ML:1.9 7.04E-5 0.46 AML other m 2021-10-20T05:07:41.85
GU.RORO.HHE. ML:2.4 0.0005355 0.68 AML other m 2021-10-20T05:07:42.19
GU.PZZ.HHN. ML:1.8 4.52E-5 1.3 AML other m 2021-10-20T05:07:42.81
IV.IMOL.HNN. ML:3.8 0.001225 0.04 AML other m 2021-10-20T05:08:44.16
IV.IMOL.HNE. ML:3.8 0.0010615 0.06 AML other m 2021-10-20T05:08:44.14
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