Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 23-12-2017 and time 23:40:57 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude ML 0.6 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 23-12-2017 22:40:57 (UTC)
  • 23-12-2017 23:40:57 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9270, 7.5170 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.

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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
Olivetta San Michele IM 5 211 211
Airole IM 7 407 618
Rocchetta Nervina IM 8 298 916
Isolabona IM 11 679 1595
Pigna IM 12 859 2454
Dolceacqua IM 12 2074 4528
Apricale IM 13 629 5157
Castel Vittorio IM 13 287 5444
Perinaldo IM 14 870 6314
Camporosso IM 15 5632 11946
Soldano IM 16 977 12923
San Biagio della Cima IM 16 1329 14252
Bajardo IM 16 312 14564
Ventimiglia IM 17 24310 38874
Vallebona IM 17 1310 40184
Vallecrosia IM 18 6956 47140
Seborga IM 18 315 47455

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km W of Sanremo (54807 inhabitants)
52 Km S of Cuneo (56081 inhabitants)
88 Km W 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 0.6 2017-12-23
22:40:57		 43.9267 7.5168 10 2018-09-04
09:10:44		 Bollettino Sismico Italiano INGV 57396281
Reviewed
Rev100 		ML 0.6 2017-12-23
22:40:57		 43.9267 7.5168 10 2017-12-23
22:46:23		 Sala Sismica INGV-Roma 52766831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-12-23 22:40:57 ± 0.15
Latitude 43.9267 ± 0.0081
Longitude 7.5168 ± 0.0162
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 57396281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1320
Semi-minor axis of confidence ellipse (meter) 699
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 249
Circular confidence region, given by single value of horizontal uncertainty (meter) 1320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 168
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.06475
Epicentral distance of station farthest from the epicenter (degree) 0.39120
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.3
Num. used stations 7
Type of magnitude ML
Reference to an origin 57396281
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-05-31 09:59:35

ML:0.6

Field Value
Value 0.6
Uncertainty 0.3
Num. used stations 7
Type of magnitude ML
Reference to an origin 52766831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-12-23 22:46:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.GBOS.HHZ. 2017-12-23T22:41:11.53 0.1 undecidable manual S 36 43.4232 50 -0.22 94
GU.STV.HHZ. 2017-12-23T22:41:09.88 0.1 undecidable manual S 337 38.5281 50 -0.56 87
GU.ENR.HHZ. 2017-12-23T22:41:08.96 0.3 undecidable manual S 347 34.1436 50 -0.32 70
IV.IMI.HHZ. 2017-12-23T22:41:07.94 0.3 undecidable manual S 93 30.1476 50 -0.27 71
GU.GBOS.HHZ. 2017-12-23T22:41:06.21 0.1 undecidable manual P 36 43.4232 50 0.49 89
GU.STV.HHZ. 2017-12-23T22:41:05.26 0.1 undecidable manual P 337 38.5281 50 0.29 93
GU.ENR.HHZ. 2017-12-23T22:41:04.71 0.1 undecidable manual P 347 34.1436 50 0.42 92
GU.BURY.HHZ. 2017-12-23T22:41:03.71 0.1 undecidable manual S 169 16.2726 122 -0.41 95
IV.IMI.HHZ. 2017-12-23T22:41:03.89 0.1 undecidable manual P 93 30.1476 50 0.22 96
FR.SAOF.HHZ.00 2017-12-23T22:41:01.53 0.1 undecidable manual S 24 7.1928 144 -0.22 100
GU.BURY.HHZ. 2017-12-23T22:41:01.47 0.1 undecidable manual P 169 16.2726 122 0.16 100
FR.SAOF.HHZ.00 2017-12-23T22:41:00.18 0.1 negative manual P 24 7.1928 144 0.23 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
FR.SAOF.HHN.00 ML:0.9 0.00012015771 0.06 AML other m 2017-12-23T22:41:01.72
FR.SAOF.HHE.00 ML:1.2 0.00024036405 0.04 AML other m 2017-12-23T22:41:01.71
GU.BURY.HHN. ML:0.5 0.000027952939999999997 0.1 AML other m 2017-12-23T22:41:03.77
GU.BURY.HHE. ML:0.7 0.00004634995 0.12 AML other m 2017-12-23T22:41:03.91
IV.IMI.HHE. ML:0.5 0.000014091950500000001 1.9 AML other m 2017-12-23T22:41:08.05
GU.ENR.HHE. ML:0.4 0.000012407218 0.06 AML other m 2017-12-23T22:41:09.28
GU.ENR.HHN. ML:0.4 0.0000117858645 0.06 AML other m 2017-12-23T22:41:09.42
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