Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 16-01-2021 and time 22:09:46 (Italy) in region 5 km W Rialto (SV)

A magnitude ML 1.4 earthquake occured in region: 5 km W Rialto (SV), on

  • 16-01-2021 21:09:46 (UTC)
  • 16-01-2021 22:09:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.2330, 8.2110 at 8 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Rialto SV 5 564 564
Osiglia SV 5 444 1008
Bormida SV 6 387 1395
Magliolo SV 6 974 2369
Giustenice SV 7 977 3346
Calice Ligure SV 7 1730 5076
Calizzano SV 8 1475 6551
Tovo San Giacomo SV 8 2582 9133
Bardineto SV 8 756 9889
Orco Feglino SV 9 890 10779
Mallare SV 10 1146 11925
Murialdo SV 10 841 12766
Boissano SV 11 2492 15258
Pietra Ligure SV 11 8992 24250
Borgio Verezzi SV 11 2205 26455
Toirano SV 12 2644 29099
Pallare SV 12 923 30022
Vezzi Portio SV 12 809 30831
Loano SV 12 11407 42238
Balestrino SV 12 595 42833
Finale Ligure SV 13 11711 54544
Borghetto Santo Spirito SV 13 4948 59492
Massimino SV 13 113 59605
Erli SV 14 245 59850
Castelvecchio di Rocca Barbena SV 14 145 59995
Plodio SV 14 650 60645
Roccavignale SV 15 752 61397
Millesimo SV 15 3383 64780
Garessio CN 15 3244 68024
Castelnuovo di Ceva CN 15 110 68134
Priola CN 15 701 68835
Perlo CN 15 116 68951
Ceriale SV 15 5561 74512
Cosseria SV 15 1105 75617
Zuccarello SV 15 309 75926
Bagnasco CN 15 1035 76961
Carcare SV 15 5587 82548
Altare SV 16 2108 84656
Noli SV 17 2736 87392
Spotorno SV 17 3803 91195
Cisano sul Neva SV 17 2085 93280
Nucetto CN 17 430 93710
Montezemolo CN 17 259 93969
Castelbianco SV 17 330 94299
Cengio SV 17 3563 97862
Quiliano SV 17 7232 105094
Vado Ligure SV 19 8336 113430
Priero CN 19 529 113959
Battifollo CN 19 219 114178
Bergeggi SV 19 1129 115307
Arnasco SV 19 645 115952
Cairo Montenotte SV 19 13269 129221
Nasino SV 20 207 129428

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km W of Savona (61345 inhabitants)
55 Km E of Cuneo (56081 inhabitants)
57 Km NE of Sanremo (54807 inhabitants)
61 Km W of Genova (586655 inhabitants)
74 Km S of Asti (76202 inhabitants)
82 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
Bulletin
Rev1000 		ML 1.4 2021-01-16
21:09:46		 44.2333 8.2112 8 2021-07-12
16:54:58		 Bollettino Sismico Italiano INGV 87076201
Reviewed
Rev100 		ML 1.8 2021-01-16
21:09:46		 44.2108 8.2313 8 2021-01-16
21:15:39		 Sala Sismica INGV-Roma 86310431
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-16 21:09:46 ± 0.13
Latitude 44.2333 ± 0.0126
Longitude 8.2112 ± 0.0126
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87076201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1546
Semi-minor axis of confidence ellipse (meter) 462
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 146
Circular confidence region, given by single value of horizontal uncertainty (meter) 1550.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.43
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.90472
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 86310431
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-16 21:15:39

ML:1.4

Field Value
Value 1.4
Uncertainty 0.4
Num. used stations 14
Type of magnitude ML
Reference to an origin 87076201
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-04 14:04:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2021-01-16T21:11:27.94 3.0 undecidable manual Sn -0.1 0
IV.LRP.EHZ. 2021-01-16T21:11:06.88 3.0 undecidable manual Pn 6.36 0
IV.RIBO.EHZ.01 2021-01-16T21:11:00.22 3.0 undecidable manual Sn -1.55 0
IV.POFI.HNZ. 2021-01-16T21:10:59.67 3.0 undecidable manual Pn -1.38 0
IV.CRTC.HHZ. 2021-01-16T21:10:45.63 3.0 negative manual P 3.14 0
IV.ATCC.EHZ. 2021-01-16T21:10:42.37 3.0 negative manual P 0.22 0
IV.APEC.HHZ. 2021-01-16T21:10:41.56 3.0 positive manual Pn 3.01 0
IV.ASSB.HHZ. 2021-01-16T21:10:40.79 3.0 positive manual P -2.23 0
GU.BHB.HHZ. 2021-01-16T21:10:16.30 1.0 undecidable manual S 312 100.4217 50 -0.56 19
GU.PZZ.HHZ. 2021-01-16T21:10:14.33 1.0 undecidable manual S 290 92.0412 50 -0.28 20
GU.STV.HHZ. 2021-01-16T21:10:08.35 0.6 undecidable manual S 271 70.374 50 -0.48 41
FR.SAOF.HHZ.00 2021-01-16T21:10:05.61 0.6 undecidable manual S 243 59.1963 50 -0.24 44
GU.BHB.HHZ. 2021-01-16T21:10:04.83 0.1 undecidable manual P 312 100.4217 50 0.64 72
GU.PZZ.HHZ. 2021-01-16T21:10:03.37 0.3 undecidable manual P 290 92.0412 50 0.48 58
GU.ROTM.HHZ. 2021-01-16T21:10:00.64 0.3 undecidable manual P 9 69.2751 50 1.26 43
GU.PCP.HHZ. 2021-01-16T21:10:00.03 0.6 undecidable manual S 38 43.2234 50 -1.56 25
GU.STV.HHZ. 2021-01-16T21:09:59.90 0.3 undecidable manual P 271 70.374 50 0.35 62
GU.RNCA.HHE. 2021-01-16T21:09:58.22 0.3 undecidable manual P 66 64.3911 50 -0.41 62
FR.SAOF.HHZ.00 2021-01-16T21:09:58.34 0.3 undecidable manual P 243 59.1963 50 0.51 61
IT.ACQ.HGZ. 2021-01-16T21:09:57.05 0.3 undecidable manual P 22 53.7018 50 0.07 68
GU.GBOS.HHZ. 2021-01-16T21:09:56.85 0.3 undecidable manual S 272 29.5482 105 -0.62 62
GU.PCP.HHZ. 2021-01-16T21:09:54.89 0.1 undecidable manual P 38 43.2234 50 -0.48 85
GU.GBOS.HHZ. 2021-01-16T21:09:53.08 0.1 undecidable manual P 272 29.5482 105 0.09 95
GU.RORO.HHZ. 2021-01-16T21:09:53.06 0.1 undecidable manual S 221 17.6712 114 -0.52 88
IV.QLNO.HHZ. 2021-01-16T21:09:52.35 0.1 undecidable manual S 47 14.6742 118 -0.3 93
IV.QLNO.HHZ. 2021-01-16T21:09:50.45 0.1 undecidable manual P 47 14.6742 118 0.24 94
GU.RORO.HHZ. 2021-01-16T21:09:50.85 0.1 undecidable manual P 221 17.6712 114 0.11 96
GU.CANO.HHZ. 2021-01-16T21:09:49.90 0.1 undecidable manual S 144 3.4965 156 0.04 100
GU.CANO.HHZ. 2021-01-16T21:09:48.95 0.1 undecidable manual P 144 3.4965 156 0.36 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.QLNO.HHE. ML:1.8 0.0006985 0.16 AML other m 2021-01-16T21:09:52.41
IV.QLNO.HHN. ML:1.7 0.00054488545 0.1024 AML other m 2021-01-16T21:09:52.62
GU.RORO.HHN. ML:2.3 0.001831256 0.1024 AML other m 2021-01-16T21:09:53.17
GU.RORO.HHE. ML:2.1 0.00106871345 0.0512 AML other m 2021-01-16T21:09:53.30
GU.GBOS.HHE. ML:1.0 0.000045373995 0.1664 AML other m 2021-01-16T21:09:56.97
GU.GBOS.HHN. ML:0.9 0.00004089807 0.1536 AML other m 2021-01-16T21:09:57.00
GU.PCP.HHN. ML:1.4 0.0000789 0.22 AML other m 2021-01-16T21:10:03.46
GU.PCP.HHE. ML:1.3 0.000058539800000000005 0.0768 AML other m 2021-01-16T21:10:03.85
FR.SAOF.HHE.00 ML:1.1 0.000024442944 0.1152 AML other m 2021-01-16T21:10:05.68
FR.SAOF.HHN.00 ML:1.0 0.000021394535 0.064 AML other m 2021-01-16T21:10:06.09
GU.STV.HHE. ML:1.1 0.00001784819 0.1536 AML other m 2021-01-16T21:10:12.54
GU.PZZ.HHE. ML:1.4 0.000027035099999999998 0.1536 AML other m 2021-01-16T21:10:16.75
GU.BHB.HHN. ML:1.8 0.00006535 0.3 AML other m 2021-01-16T21:10:17.59
GU.BHB.HHE. ML:1.6 0.00003557125499999999 0.2944 AML other m 2021-01-16T21:10:17.66
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