Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.3 on date 17-02-2021 and time 20:18:30 (UTC) in region 3 km SE Nasino (SV)

A magnitude ML 2.3 earthquake occured in region: 3 km SE Nasino (SV), on

  • 17-02-2021 20:18:30 (UTC)
  • 17-02-2021 21:18:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0960, 8.0480 at 7 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
Nasino SV 3 207 207
Onzo SV 3 219 426
Castelbianco SV 3 330 756
Vendone SV 3 388 1144
Aquila d'Arroscia IM 4 166 1310
Alto CN 4 128 1438
Ranzo IM 5 557 1995
Arnasco SV 5 645 2640
Ortovero SV 6 1586 4226
Zuccarello SV 6 309 4535
Erli SV 7 245 4780
Borghetto d'Arroscia IM 7 456 5236
Castelvecchio di Rocca Barbena SV 7 145 5381
Casanova Lerrone SV 7 749 6130
Caprauna CN 8 104 6234
Cisano sul Neva SV 8 2085 8319
Garlenda SV 8 1254 9573
Vessalico IM 9 282 9855
Villanova d'Albenga SV 9 2657 12512
Testico SV 10 196 12708
Stellanello SV 11 808 13516
Balestrino SV 11 595 14111
Armo IM 11 111 14222
Cesio IM 11 283 14505
Garessio CN 12 3244 17749
Pieve di Teco IM 12 1338 19087
Ormea CN 12 1617 20704
Bardineto SV 13 756 21460
Toirano SV 13 2644 24104
Caravonica IM 13 282 24386
Alassio SV 14 10934 35320
Chiusanico IM 14 607 35927
Albenga SV 14 24213 60140
Pornassio IM 14 685 60825
Boissano SV 15 2492 63317
Villa Faraldi IM 15 444 63761
Ceriale SV 15 5561 69322
Chiusavecchia IM 15 577 69899
Borgomaro IM 16 865 70764
Lucinasco IM 16 272 71036
Borghetto Santo Spirito SV 16 4948 75984
Aurigo IM 16 347 76331
Laigueglia SV 16 1810 78141
Rezzo IM 16 366 78507
Diano Arentino IM 16 722 79229
Calizzano SV 17 1475 80704
Andora SV 17 7552 88256
Priola CN 17 701 88957
Cosio d'Arroscia IM 17 221 89178
Loano SV 17 11407 100585
Pontedassio IM 17 2323 102908
Giustenice SV 18 977 103885
Diano San Pietro IM 18 1145 105030
Montegrosso Pian Latte IM 19 118 105148
San Bartolomeo al Mare IM 19 3129 108277
Diano Castello IM 19 2214 110491
Magliolo SV 19 974 111465
Mendatica IM 19 185 111650
Vasia IM 20 389 112039
Cervo IM 20 1187 113226
Pietra Ligure SV 20 8992 122218
Tovo San Giacomo SV 20 2582 124800

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km NE of Sanremo (54807 inhabitants)
42 Km SW of Savona (61345 inhabitants)
52 Km SE of Cuneo (56081 inhabitants)
79 Km W of Genova (586655 inhabitants)
90 Km S of Asti (76202 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 2.3 2021-02-17
20:18:30		 44.0958 8.0483 7 2021-07-12
16:55:01		 Bollettino Sismico Italiano INGV 87786311
Reviewed
Rev100 		Md 1.7
ML 2.3 		2021-02-17
20:18:30		 44.0955 8.0582 10 2021-02-17
20:53:22		 Sala Sismica INGV-Roma 87253901
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-17 20:18:30 ± 0.15
Latitude 44.0958 ± 0.0090
Longitude 8.0483 ± 0.0113
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87786311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1113
Semi-minor axis of confidence ellipse (meter) 643
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 142
Circular confidence region, given by single value of horizontal uncertainty (meter) 1110.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 120
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.49
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.91645
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:2.3

Field Value
Value 2.3
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 87786311
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-09 13:42:55

ML:2.3

Field Value
Value 2.3
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 87253901
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-17 20:53:22

Md:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 3
Type of magnitude Md
Reference to an origin 87253901
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-17 20:53:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
ST.PANI.EHZ. 2021-02-17T20:19:19.98 3.0 undecidable manual Sg 17.26 0
GU.BLANC.HHZ. 2021-02-17T20:19:05.58 0.3 undecidable manual P 336 212.7315 38 1.37 25
RD.ORIF.BHZ. 2021-02-17T20:19:03.50 0.3 undecidable manual P 299 194.2611 38 1.59 24
GU.BHB.HHZ. 2021-02-17T20:19:01.00 0.3 undecidable manual S 323 102.9192 50 -0.3 59
GU.PZZ.HHE. 2021-02-17T20:18:56.94 0.3 undecidable manual S 302 86.9463 50 -0.09 64
IV.PLMA.HHE. 2021-02-17T20:18:56.66 0.6 undecidable manual P 91 143.9448 50 2.05 14
IV.MTGR.HHZ. 2021-02-17T20:18:52.79 3.0 positive manual Pg 11.08 0
IV.MSSA.HHZ. 2021-02-17T20:18:51.38 0.3 undecidable manual P 78 119.3916 50 0.57 53
IV.MONC.HHZ. 2021-02-17T20:18:50.73 0.3 undecidable manual P 355 108.9132 50 1.52 34
GU.STV.HHN. 2021-02-17T20:18:49.09 0.3 undecidable manual S 286 59.7957 50 -0.68 57
GU.PCP.HHN. 2021-02-17T20:18:49.76 0.3 undecidable manual S 38 63.2922 50 -0.94 51
GU.BHB.HHZ. 2021-02-17T20:18:48.42 0.1 undecidable manual P 323 102.9192 50 0.14 82
IV.FREG.EHZ. 2021-02-17T20:18:48.26 3.0 undecidable manual Sn -5.6 0
GU.ROTM.HHE. 2021-02-17T20:18:47.02 0.3 undecidable manual P 16 86.9463 50 1.2 43
GU.PZZ.HHE. 2021-02-17T20:18:46.20 0.3 undecidable manual P 302 86.9463 50 0.39 60
GU.RNCA.HHE. 2021-02-17T20:18:45.04 0.3 undecidable manual P 60 82.9503 50 -0.16 64
FR.SAOF.HHZ.00 2021-02-17T20:18:43.76 0.6 undecidable manual S 253 41.3253 50 -1.09 33
GU.STV.HHN. 2021-02-17T20:18:41.76 0.3 undecidable manual P 286 59.7957 50 0.13 67
GU.PCP.HHN. 2021-02-17T20:18:41.76 0.3 undecidable manual P 38 63.2922 50 -0.41 63
IV.QLNO.HHZ. 2021-02-17T20:18:41.53 0.6 undecidable manual S 43 34.6431 102 -1.26 31
GU.BURY.HNN. 2021-02-17T20:18:40.32 0.3 undecidable manual P 229 52.4031 50 -0.17 67
FR.SAOF.HHZ.00 2021-02-17T20:18:38.43 0.1 undecidable manual P 253 41.3253 50 -0.36 88
GU.IMI.HHZ. 2021-02-17T20:18:38.73 0.3 undecidable manual S 211 23.9538 107 -0.46 66
GU.GBOS.HHZ. 2021-02-17T20:18:38.80 0.3 undecidable manual S 314 23.1546 107 -0.12 72
IV.QLNO.HHZ. 2021-02-17T20:18:37.28 0.1 positive manual P 43 34.6431 102 -0.31 90
GU.CANO.HHZ. 2021-02-17T20:18:37.21 0.3 undecidable manual S 50 19.4694 110 -0.5 66
GU.GBOS.HHZ. 2021-02-17T20:18:35.66 0.1 negative manual P 314 23.1546 107 0.3 92
GU.IMI.HHZ. 2021-02-17T20:18:35.70 0.1 undecidable manual P 211 23.9538 107 0.19 94
GU.CANO.HHZ. 2021-02-17T20:18:34.77 0.1 undecidable manual P 50 19.4694 110 0.11 96
GU.RORO.HHZ. 2021-02-17T20:18:33.06 0.1 undecidable manual S 38 2.3976 162 -0.06 100
GU.RORO.HHZ. 2021-02-17T20:18:32.34 0.1 undecidable manual P 38 2.3976 162 0.33 95
ST.CARE.EHZ. 2021-02-17T20:18:31.32 3.0 negative manual Pn 2.93 0
IV.PESA.HHZ. 2021-02-17T20:18:05.32 3.0 undecidable manual Sn -0.64 0
IV.IMOL.HNZ. 2021-02-17T20:18:00.95 3.0 negative manual Pn 0.24 0
IV.ASSB.HHZ. 2021-02-17T20:17:59.54 3.0 undecidable manual Sg 0.15 0
IV.SRES.HHZ. 2021-02-17T20:17:49.23 3.0 undecidable manual P -0.4 0
IV.ASSB.HHZ. 2021-02-17T20:17:44.97 3.0 undecidable manual P -0.12 0
IV.RM33.HNZ. 2021-02-17T20:17:41.32 3.0 undecidable manual P -0.29 0
IV.MF5.EHZ. 2021-02-17T20:17:37.90 3.0 negative manual P 0.89 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GBOS.HHE. ML:2.2 0.001245 0.9 AML other m 2021-02-17T20:18:39.54
GU.GBOS.HHN. ML:2.3 0.00125 0.32 AML other m 2021-02-17T20:18:39.81
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
Waveforms Seismic signals in miniseed + resp format Download