Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 29-12-2021 and time 02:37:36 (Italy) in region 4 km W Rialto (SV)

A magnitude ML 1.1 earthquake occured in region: 4 km W Rialto (SV), on

  • 29-12-2021 01:37:36 (UTC)
  • 29-12-2021 02:37:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.2390, 8.2260 at 6 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Bormida SV 5 387 387
Rialto SV 5 564 951
Osiglia SV 5 444 1395
Magliolo SV 6 974 2369
Calice Ligure SV 7 1730 4099
Giustenice SV 8 977 5076
Tovo San Giacomo SV 8 2582 7658
Mallare SV 8 1146 8804
Orco Feglino SV 8 890 9694
Calizzano SV 9 1475 11169
Bardineto SV 9 756 11925
Murialdo SV 10 841 12766
Pallare SV 11 923 13689
Borgio Verezzi SV 11 2205 15894
Pietra Ligure SV 11 8992 24886
Vezzi Portio SV 11 809 25695
Boissano SV 12 2492 28187
Finale Ligure SV 12 11711 39898
Loano SV 12 11407 51305
Toirano SV 13 2644 53949
Plodio SV 13 650 54599
Balestrino SV 13 595 55194
Borghetto Santo Spirito SV 14 4948 60142
Roccavignale SV 14 752 60894
Massimino SV 14 113 61007
Millesimo SV 14 3383 64390
Altare SV 14 2108 66498
Carcare SV 14 5587 72085
Cosseria SV 15 1105 73190
Castelvecchio di Rocca Barbena SV 15 145 73335
Erli SV 15 245 73580
Castelnuovo di Ceva CN 15 110 73690
Perlo CN 15 116 73806
Spotorno SV 16 3803 77609
Noli SV 16 2736 80345
Ceriale SV 16 5561 85906
Bagnasco CN 16 1035 86941
Priola CN 16 701 87642
Quiliano SV 16 7232 94874
Garessio CN 16 3244 98118
Zuccarello SV 17 309 98427
Cengio SV 17 3563 101990
Montezemolo CN 17 259 102249
Vado Ligure SV 17 8336 110585
Nucetto CN 17 430 111015
Bergeggi SV 18 1129 112144
Cisano sul Neva SV 18 2085 114229
Castelbianco SV 18 330 114559
Cairo Montenotte SV 18 13269 127828
Priero CN 19 529 128357
Battifollo CN 19 219 128576
Saliceto CN 20 1323 129899

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km W of Savona (61345 inhabitants)
56 Km E of Cuneo (56081 inhabitants)
58 Km NE of Sanremo (54807 inhabitants)
60 Km W of Genova (586655 inhabitants)
74 Km S of Asti (76202 inhabitants)
81 Km SW of Alessandria (93943 inhabitants)
95 Km SE of Moncalieri (57294 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.1 2021-12-29
01:37:36		 44.2392 8.2257 6 2021-12-29
01:47:14		 Sala Sismica INGV-Roma 99095531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-29 01:37:36 ± 0.21
Latitude 44.2392 ± 0.0198
Longitude 8.2257 ± 0.0188
Depth (km) 6 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 99095531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2498
Semi-minor axis of confidence ellipse (meter) 155
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 328
Circular confidence region, given by single value of horizontal uncertainty (meter) 2500.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 156
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.48
Epicentral distance of station closest to the epicenter (degree) 0.12141
Epicentral distance of station farthest from the epicenter (degree) 0.57826
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 3
Type of magnitude ML
Reference to an origin 99095531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-29 01:47:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.ENR.HHE. 2021-12-29T01:37:49.04 0.1 undecidable manual P 269 64.1913 50 0.83 77
GU.RNCA.HHE. 2021-12-29T01:37:47.87 0.1 undecidable manual P 66 62.9925 50 -0.17 94
GU.GBOS.HHZ. 2021-12-29T01:37:46.56 0.3 undecidable manual S 271 30.6471 102 -0.6 67
GU.MGRO.HHZ. 2021-12-29T01:37:44.52 0.1 undecidable manual P 237 39.7269 99 0.16 98
GU.PCP.HHZ. 2021-12-29T01:37:44.13 0.1 undecidable manual P 37 42.0246 50 -0.67 85
GU.RORO.HHZ. 2021-12-29T01:37:42.85 0.3 undecidable manual S 222 18.87 108 -0.36 73
GU.GBOS.HHZ. 2021-12-29T01:37:42.73 0.1 undecidable manual P 271 30.6471 102 0.17 100
IV.QLNO.HHZ. 2021-12-29T01:37:41.40 0.3 undecidable manual S 45 13.4754 115 -0.04 79
GU.RORO.HHZ. 2021-12-29T01:37:40.53 1.0 undecidable manual P 222 18.87 108 0.25 25
IV.QLNO.HHZ. 2021-12-29T01:37:39.68 0.1 undecidable manual P 45 13.4754 115 0.41 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.QLNO.HHE. ML:0.7 0.00006254139 0.18 AML other m 2021-12-29T01:37:41.95
IV.QLNO.HHN. ML:1.1 0.0001387023 0.12 AML other m 2021-12-29T01:37:41.65
GU.RORO.HHN. ML:1.4 0.00023957980000000002 0.12 AML other m 2021-12-29T01:37:43.06
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