Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 31-12-2020 and time 17:37:02 (Italy) in region 4 km SW Molini di Triora (IM)

A magnitude ML 1.6 earthquake occured in region: 4 km SW Molini di Triora (IM), on

  • 31-12-2020 16:37:02 (UTC)
  • 31-12-2020 17:37:02 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9600, 7.7500 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
Triora IM 4 355 355
Molini di Triora IM 4 617 972
Bajardo IM 7 312 1284
Castel Vittorio IM 7 287 1571
Pigna IM 7 859 2430
Montalto Ligure IM 8 377 2807
Ceriana IM 9 1250 4057
Badalucco IM 9 1136 5193
Carpasio IM 9 168 5361
Apricale IM 11 629 5990
Perinaldo IM 12 870 6860
Rezzo IM 12 366 7226
Isolabona IM 12 679 7905
Montegrosso Pian Latte IM 13 118 8023
Briga Alta CN 14 39 8062
Mendatica IM 14 185 8247
Rocchetta Nervina IM 14 298 8545
Castellaro IM 14 1256 9801
Aurigo IM 14 347 10148
Pietrabruna IM 15 501 10649
Cosio d'Arroscia IM 15 221 10870
Taggia IM 15 14116 24986
Seborga IM 15 315 25301
Prelà IM 16 503 25804
Sanremo IM 16 54807 80611
Pornassio IM 16 685 81296
Borgomaro IM 16 865 82161
Dolceacqua IM 16 2074 84235
Pompeiana IM 16 823 85058
Pieve di Teco IM 17 1338 86396
Soldano IM 17 977 87373
Vasia IM 17 389 87762
Terzorio IM 17 216 87978
Lucinasco IM 17 272 88250
Dolcedo IM 17 1415 89665
Riva Ligure IM 17 2910 92575
Caravonica IM 17 282 92857
Vallebona IM 18 1310 94167
San Biagio della Cima IM 18 1329 95496
Ospedaletti IM 18 3367 98863
Santo Stefano al Mare IM 18 2197 101060
Airole IM 18 407 101467
Civezza IM 19 609 102076
Camporosso IM 19 5632 107708
Chiusavecchia IM 19 577 108285
Cesio IM 19 283 108568
Cipressa IM 19 1290 109858
Costarainera IM 19 828 110686
Armo IM 20 111 110797
Chiusanico IM 20 607 111404
Vessalico IM 20 282 111686

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km N of Sanremo (54807 inhabitants)
51 Km SE of Cuneo (56081 inhabitants)
70 Km SW of Savona (61345 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 1.6 2020-12-31
16:37:02		 43.9597 7.75 8 2021-02-26
14:56:18		 Bollettino Sismico Italiano INGV 86883691
Reviewed
Rev100 		ML 1.6 2020-12-31
16:37:02		 43.9593 7.7498 8 2020-12-31
16:48:02		 Sala Sismica INGV-Roma 85908681
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-31 16:37:02 ± 0.11
Latitude 43.9597 ± 0.0072
Longitude 7.7500 ± 0.0062
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 86883691

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 732
Semi-minor axis of confidence ellipse (meter) 355
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 171
Circular confidence region, given by single value of horizontal uncertainty (meter) 730.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 103
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.94159
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 10
Type of magnitude ML
Reference to an origin 85908681
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-31 16:48:02

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 86883691
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-06 13:37:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.BLANC.HHZ. 2020-12-31T16:38:06.17 3.0 undecidable manual Sg 1.12 0
GU.BHB.HHE. 2020-12-31T16:37:33.12 0.6 undecidable manual S 339 104.5176 50 -0.84 34
GU.PZZ.HHZ. 2020-12-31T16:37:27.51 0.3 undecidable manual S 320 78.8655 50 0.41 63
IV.QLNO.HHZ. 2020-12-31T16:37:22.39 0.3 undecidable manual S 49 62.3931 50 -0.3 67
GU.BHB.HHE. 2020-12-31T16:37:21.17 0.3 undecidable manual P 339 104.5176 50 0.33 61
GU.PCP.HHZ. 2020-12-31T16:37:19.27 0.3 undecidable manual P 44 90.3429 50 0.62 58
GU.CANO.HHZ. 2020-12-31T16:37:18.32 0.3 undecidable manual S 55 47.619 50 -0.43 67
GU.STV.HHZ. 2020-12-31T16:37:17.69 0.3 undecidable manual S 313 46.3203 50 -0.71 60
GU.PZZ.HHZ. 2020-12-31T16:37:17.90 0.3 undecidable manual P 320 78.8655 50 1.01 50
GU.ENR.HHZ. 2020-12-31T16:37:16.12 0.3 undecidable manual S 319 39.9267 50 -0.59 64
IV.QLNO.HHZ. 2020-12-31T16:37:14.64 0.3 undecidable manual P 49 62.3931 50 0.3 67
GU.GBOS.HHZ. 2020-12-31T16:37:14.27 0.3 undecidable manual S 13 32.0457 104 -0.14 73
GU.RORO.HHZ. 2020-12-31T16:37:13.36 0.3 undecidable manual S 56 30.4473 105 -0.49 68
GU.STV.HHZ. 2020-12-31T16:37:12.13 0.1 undecidable manual P 313 46.3203 50 0.27 92
GU.CANO.HHZ. 2020-12-31T16:37:12.17 0.3 undecidable manual P 55 47.619 50 0.11 71
GU.BURY.HHE. 2020-12-31T16:37:11.60 0.3 undecidable manual S 218 24.9528 108 -0.44 69
GU.ENR.HHZ. 2020-12-31T16:37:11.07 0.1 undecidable manual P 319 39.9267 50 0.19 95
GU.GBOS.HHZ. 2020-12-31T16:37:09.80 0.1 undecidable manual P 13 32.0457 104 0.25 95
GU.RORO.HHZ. 2020-12-31T16:37:09.33 0.3 undecidable manual P 56 30.4473 105 0.1 74
FR.SAOF.HHE.00 2020-12-31T16:37:09.02 0.1 undecidable manual S 281 15.9729 117 -0.12 100
GU.BURY.HHE. 2020-12-31T16:37:08.02 0.3 undecidable manual P 218 24.9528 108 -0.17 73
IV.IMI.HHE. 2020-12-31T16:37:07.97 0.3 undecidable manual S 115 12.6762 123 -0.17 75
IV.IMI.HHE. 2020-12-31T16:37:06.14 0.1 undecidable manual P 115 12.6762 123 0.21 99
FR.SAOF.HHE.00 2020-12-31T16:37:06.70 0.1 undecidable manual P 281 15.9729 117 0.18 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.RORO.HHE. ML:1.8 0.0002759222 0.1664 AML other m 2020-12-31T16:37:14.11
GU.RORO.HHN. ML:1.7 0.00024028015 0.1024 AML other m 2020-12-31T16:37:14.02
GU.ENR.HHE. ML:1.5 0.00012195614999999999 0.0768 AML other m 2020-12-31T16:37:16.36
GU.ENR.HHN. ML:1.6 0.00014489754999999998 0.0768 AML other m 2020-12-31T16:37:16.63
GU.STV.HHE. ML:1.5 0.000093858705 0.1024 AML other m 2020-12-31T16:37:18.21
GU.STV.HHN. ML:1.4 0.000068144285 0.2304 AML other m 2020-12-31T16:37:18.25
GU.CANO.HHN. ML:1.9 0.00022110374999999999 0.1664 AML other m 2020-12-31T16:37:19.46
GU.CANO.HHE. ML:1.8 0.00019920660000000002 0.2368 AML other m 2020-12-31T16:37:20.34
IV.QLNO.HHN. ML:1.6 0.00008206337999999999 0.1536 AML other m 2020-12-31T16:37:23.60
GU.PZZ.HHN. ML:1.4 0.00004139592 1.7952 AML other m 2020-12-31T16:37:27.02
IV.QLNO.HHE. ML:1.5 0.0000590038 0.2432 AML other m 2020-12-31T16:37:28.58
GU.PZZ.HHE. ML:1.5 0.000045025485 0.1664 AML other m 2020-12-31T16:37:28.81
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