Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 31-12-2020 and time 13:34:25 (Italy) in region 5 km SW Triora (IM)

A magnitude ML 1.6 earthquake occured in region: 5 km SW Triora (IM), on

  • 31-12-2020 12:34:25 (UTC)
  • 31-12-2020 13:34:25 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9520, 7.7430 at 10 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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
Dolceacqua IM 15 2074 81390
Briga Alta CN 15 39 81429
Aurigo IM 15 347 81776
Mendatica IM 15 185 81961
Soldano IM 16 977 82938
Cosio d'Arroscia IM 16 221 83159
Prelà IM 16 503 83662
Pompeiana IM 16 823 84485
San Biagio della Cima IM 16 1329 85814
Vallebona IM 16 1310 87124
Borgomaro IM 17 865 87989
Terzorio IM 17 216 88205
Pornassio IM 17 685 88890
Riva Ligure IM 17 2910 91800
Ospedaletti IM 17 3367 95167
Vasia IM 17 389 95556
Airole IM 17 407 95963
Dolcedo IM 18 1415 97378
Pieve di Teco IM 18 1338 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 19 609 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 1.6 2020-12-31
12:34:25		 43.9515 7.7433 10 2021-02-26
14:56:18		 Bollettino Sismico Italiano INGV 86883491
Reviewed
Rev100 		ML 1.6 2020-12-31
12:34:25		 43.9515 7.7432 10 2020-12-31
12:43:21		 Sala Sismica INGV-Roma 85906121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-31 12:34:25 ± 0.08
Latitude 43.9515 ± 0.0090
Longitude 7.7433 ± 0.0062
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86883491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 958
Semi-minor axis of confidence ellipse (meter) 473
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 188
Circular confidence region, given by single value of horizontal uncertainty (meter) 960.0
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) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.11511
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:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 86883491
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-06 13:23:25

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 85906121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-31 12:43:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.PCP.HHZ. 2020-12-31T12:34:52.40 1.0 undecidable manual S 44 91.3419 50 -0.15 21
IV.QLNO.HHZ. 2020-12-31T12:34:44.83 0.6 undecidable manual S 49 63.2922 50 -0.24 44
GU.PCP.HHZ. 2020-12-31T12:34:41.79 1.0 undecidable manual P 44 91.3419 50 0.74 18
GU.CANO.HHZ. 2020-12-31T12:34:40.75 0.6 undecidable manual S 54 48.5181 50 -0.37 44
GU.STV.HHZ. 2020-12-31T12:34:40.21 0.6 undecidable manual S 315 46.5201 50 -0.38 44
GU.ENR.HHZ. 2020-12-31T12:34:38.45 0.6 undecidable manual S 320 40.2264 50 -0.47 44
IV.QLNO.HHZ. 2020-12-31T12:34:37.27 0.3 negative manual P 49 63.2922 50 0.53 61
GU.RORO.HHZ. 2020-12-31T12:34:36.19 0.6 undecidable manual S 55 31.3464 50 -0.35 45
GU.GBOS.HHZ. 2020-12-31T12:34:36.86 0.6 undecidable manual S 13 33.0447 50 -0.14 47
GU.STV.HHZ. 2020-12-31T12:34:34.56 0.6 negative manual P 315 46.5201 50 0.41 44
GU.CANO.HHZ. 2020-12-31T12:34:34.75 0.6 positive manual P 54 48.5181 50 0.29 45
GU.ENR.HHZ. 2020-12-31T12:34:33.55 1.0 undecidable manual P 320 40.2264 50 0.37 22
GU.BURY.HHE. 2020-12-31T12:34:33.97 0.6 undecidable manual S 219 23.9538 112 -0.31 46
GU.GBOS.HHZ. 2020-12-31T12:34:32.34 0.1 undecidable manual P 13 33.0447 50 0.26 92
GU.RORO.HHZ. 2020-12-31T12:34:31.79 0.6 negative manual P 55 31.3464 50 -0.02 49
FR.SAOF.HHZ.00 2020-12-31T12:34:31.50 0.3 undecidable manual S 284 15.6732 121 -0.2 72
GU.BURY.HHE. 2020-12-31T12:34:30.59 0.1 undecidable manual P 219 23.9538 112 0.08 97
IV.IMI.HHZ. 2020-12-31T12:34:30.42 0.6 undecidable manual S 111 12.7761 126 -0.45 46
FR.SAOF.HHZ.00 2020-12-31T12:34:29.18 0.1 positive manual P 284 15.6732 121 0.17 97
IV.IMI.HHZ. 2020-12-31T12:34:28.58 0.1 positive manual P 111 12.7761 126 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.IMI.HHE. ML:2.4 0.002985 0.1 AML other m 2020-12-31T12:34:30.55
IV.IMI.HHN. ML:2.4 0.00253 0.08 AML other m 2020-12-31T12:34:30.82
FR.SAOF.HHE.00 ML:1.7 0.0004325 0.52 AML other m 2020-12-31T12:34:32.48
FR.SAOF.HHN.00 ML:1.5 0.0003155 0.54 AML other m 2020-12-31T12:34:32.62
GU.RORO.HHE. ML:2.0 0.0005235 1.58 AML other m 2020-12-31T12:34:33.99
GU.RORO.HHN. ML:1.7 0.00020950000000000002 0.14 AML other m 2020-12-31T12:34:36.52
GU.GBOS.HHE. ML:1.3 0.00008405 1.48 AML other m 2020-12-31T12:34:36.99
GU.GBOS.HHN. ML:1.1 0.000058800000000000006 0.9 AML other m 2020-12-31T12:34:37.07
GU.ENR.HHN. ML:1.4 0.00008795 0.94 AML other m 2020-12-31T12:34:39.38
GU.ENR.HHE. ML:1.4 0.00008230000000000001 0.06 AML other m 2020-12-31T12:34:39.67
GU.STV.HHE. ML:1.4 0.00007879999999999999 0.18 AML other m 2020-12-31T12:34:40.78
GU.STV.HHN. ML:1.3 0.0000526 0.32 AML other m 2020-12-31T12:34:40.74
GU.CANO.HHN. ML:2.0 0.0002985 1.6 AML other m 2020-12-31T12:34:42.91
IV.QLNO.HHN. ML:1.6 0.00008675 1.12 AML other m 2020-12-31T12:34:45.98
IV.QLNO.HHE. ML:1.6 0.00008085 1 AML other m 2020-12-31T12:34:46.36
GU.CANO.HHE. ML:1.8 0.000177 0.3 AML other m 2020-12-31T12:34:48.90
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