Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 31-12-2020 and time 11:43:29 (Italy) in region 5 km SW Triora (IM)

A magnitude ML 1.5 earthquake occured in region: 5 km SW Triora (IM), on

  • 31-12-2020 10:43:29 (UTC)
  • 31-12-2020 11:43:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9510, 7.7440 at 9 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
Molini di Triora IM 5 617 617
Triora IM 5 355 972
Bajardo IM 6 312 1284
Castel Vittorio IM 6 287 1571
Pigna IM 7 859 2430
Ceriana IM 8 1250 3680
Montalto Ligure IM 9 377 4057
Badalucco IM 9 1136 5193
Carpasio IM 10 168 5361
Apricale IM 10 629 5990
Perinaldo IM 11 870 6860
Isolabona IM 11 679 7539
Rezzo IM 13 366 7905
Rocchetta Nervina IM 13 298 8203
Castellaro IM 14 1256 9459
Montegrosso Pian Latte IM 14 118 9577
Seborga IM 14 315 9892
Pietrabruna IM 15 501 10393
Taggia IM 15 14116 24509
Sanremo IM 15 54807 79316
Briga Alta CN 15 39 79355
Aurigo IM 15 347 79702
Dolceacqua IM 15 2074 81776
Mendatica IM 15 185 81961
Soldano IM 15 977 82938
Cosio d'Arroscia IM 16 221 83159
Prelà IM 16 503 83662
Pompeiana IM 16 823 84485
Vallebona IM 16 1310 85795
San Biagio della Cima IM 16 1329 87124
Borgomaro IM 16 865 87989
Terzorio IM 17 216 88205
Riva Ligure IM 17 2910 91115
Ospedaletti IM 17 3367 94482
Pornassio IM 17 685 95167
Vasia IM 17 389 95556
Dolcedo IM 17 1415 96971
Pieve di Teco IM 18 1338 98309
Airole IM 18 407 98716
Camporosso IM 18 5632 104348
Lucinasco IM 18 272 104620
Santo Stefano al Mare IM 18 2197 106817
Caravonica IM 18 282 107099
Civezza IM 18 609 107708
Cipressa IM 19 1290 108998
Costarainera IM 19 828 109826
Vallecrosia IM 19 6956 116782
Chiusavecchia IM 19 577 117359
Cesio IM 20 283 117642
Bordighera IM 20 10469 128111
Olivetta San Michele IM 20 211 128322

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km N of Sanremo (54807 inhabitants)
52 Km SE of Cuneo (56081 inhabitants)
71 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 1.5 2020-12-31
10:43:29		 43.9508 7.7442 9 2021-02-26
14:56:17		 Bollettino Sismico Italiano INGV 86851021
Reviewed
Rev100 		ML 1.5 2020-12-31
10:43:29		 43.9508 7.744 9 2020-12-31
10:51:36		 Sala Sismica INGV-Roma 85902651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-31 10:43:29 ± 0.1
Latitude 43.9508 ± 0.0108
Longitude 7.7442 ± 0.0062
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86851021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1134
Semi-minor axis of confidence ellipse (meter) 510
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 186
Circular confidence region, given by single value of horizontal uncertainty (meter) 1130.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.11421
Epicentral distance of station farthest from the epicenter (degree) 0.82288
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 85902651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-31 10:51:36

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 86851021
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-05 09:14:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.PCP.HHZ. 2020-12-31T10:43:57.13 1.0 undecidable manual S 44 91.3419 50 0.13 21
IV.QLNO.HHZ. 2020-12-31T10:43:49.16 0.6 undecidable manual S 49 63.2922 50 -0.36 43
GU.PCP.HHZ. 2020-12-31T10:43:46.26 0.3 undecidable manual P 44 91.3419 50 0.77 53
GU.CANO.HHZ. 2020-12-31T10:43:45.23 0.3 undecidable manual S 54 48.5181 50 -0.33 67
GU.STV.HHZ. 2020-12-31T10:43:44.65 0.3 undecidable manual S 315 46.62 50 -0.41 66
GU.ENR.HHZ. 2020-12-31T10:43:42.92 0.3 undecidable manual S 320 40.3263 50 -0.47 66
IV.QLNO.HHZ. 2020-12-31T10:43:41.64 0.1 undecidable manual P 49 63.2922 50 0.47 84
GU.GBOS.HHZ. 2020-12-31T10:43:41.12 0.3 undecidable manual S 13 33.1446 50 -0.34 69
GU.RORO.HHZ. 2020-12-31T10:43:40.59 0.3 undecidable manual S 55 31.3464 50 -0.39 68
GU.CANO.HHZ. 2020-12-31T10:43:39.04 0.3 undecidable manual P 54 48.5181 50 0.15 70
GU.BURY.HNZ. 2020-12-31T10:43:38.42 0.3 undecidable manual S 219 23.9538 111 -0.26 71
GU.STV.HHZ. 2020-12-31T10:43:38.97 0.3 undecidable manual P 315 46.62 50 0.37 67
GU.ENR.HHZ. 2020-12-31T10:43:37.96 0.1 undecidable manual P 320 40.3263 50 0.33 91
GU.GBOS.HHZ. 2020-12-31T10:43:36.77 0.1 undecidable manual P 13 33.1446 50 0.25 93
GU.RORO.HHZ. 2020-12-31T10:43:36.37 0.1 undecidable manual P 55 31.3464 50 0.13 96
FR.SAOF.HHZ.00 2020-12-31T10:43:35.96 0.3 undecidable manual S 284 15.7731 121 -0.16 74
GU.BURY.HNZ. 2020-12-31T10:43:34.94 0.3 undecidable manual P 219 23.9538 111 0.02 75
IV.IMI.HHZ. 2020-12-31T10:43:34.77 0.3 undecidable manual S 111 12.6762 126 -0.47 69
IV.IMI.HHZ. 2020-12-31T10:43:33.02 0.1 undecidable manual P 111 12.6762 126 0.09 100
FR.SAOF.HHZ.00 2020-12-31T10:43:33.59 0.1 undecidable manual P 284 15.7731 121 0.15 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.IMI.HHE. ML:2.5 0.0034950000000000003 1.88 AML other m 2020-12-31T10:43:34.00
IV.IMI.HHN. ML:2.4 0.0025999999999999994 0.08 AML other m 2020-12-31T10:43:35.27
GU.RORO.HHE. ML:1.8 0.00030942995 0.16 AML other m 2020-12-31T10:43:40.00
GU.RORO.HHN. ML:1.6 0.000198419 0.1152 AML other m 2020-12-31T10:43:40.92
GU.GBOS.HHE. ML:1.2 0.00006925970500000001 0.1408 AML other m 2020-12-31T10:43:41.63
GU.GBOS.HHN. ML:1.0 0.000046982444999999996 0.1408 AML other m 2020-12-31T10:43:41.97
GU.ENR.HHE. ML:1.2 0.000054163435 0.0832 AML other m 2020-12-31T10:43:43.40
GU.ENR.HHN. ML:1.2 0.000060627845 0.064 AML other m 2020-12-31T10:43:43.81
GU.STV.HHN. ML:1.2 0.000038056565 0.1792 AML other m 2020-12-31T10:43:45.15
GU.STV.HHE. ML:1.4 0.000077 0.18 AML other m 2020-12-31T10:43:45.22
GU.CANO.HHE. ML:1.7 0.00013550815 0.1152 AML other m 2020-12-31T10:43:46.67
GU.CANO.HHN. ML:1.9 0.00023434519999999997 0.2816 AML other m 2020-12-31T10:43:47.37
IV.QLNO.HHN. ML:1.6 0.000075930835 0.1792 AML other m 2020-12-31T10:43:50.42
IV.QLNO.HHE. ML:1.5 0.00005985427 0.1408 AML other m 2020-12-31T10:43:50.80
GU.PCP.HHN. ML:1.6 0.000043311073500000004 0.32 AML other m 2020-12-31T10:44:00.71
GU.PCP.HHE. ML:1.6 0.0000412317 0.224 AML other m 2020-12-31T10:44:00.68
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