Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 0.6 on date 18-04-2023 and time 09:41:49 (UTC) in region 3 km S Molini di Triora (IM)

A magnitude ML 0.6 (quarry blast) earthquake occured in region: 3 km S Molini di Triora (IM), on

  • 18-04-2023 09:41:49 (UTC)
  • 18-04-2023 11:41:49 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.9650, 7.7770 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: quarry blast.

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 3 617 617
Triora IM 4 355 972
Montalto Ligure IM 7 377 1349
Carpasio IM 7 168 1517
Badalucco IM 8 1136 2653
Bajardo IM 8 312 2965
Castel Vittorio IM 9 287 3252
Ceriana IM 9 1250 4502
Pigna IM 10 859 5361
Rezzo IM 10 366 5727
Montegrosso Pian Latte IM 12 118 5845
Aurigo IM 12 347 6192
Mendatica IM 13 185 6377
Apricale IM 13 629 7006
Pietrabruna IM 13 501 7507
Cosio d'Arroscia IM 13 221 7728
Castellaro IM 13 1256 8984
Briga Alta CN 13 39 9023
Prelà IM 14 503 9526
Borgomaro IM 14 865 10391
Perinaldo IM 14 870 11261
Pornassio IM 14 685 11946
Isolabona IM 14 679 12625
Pieve di Teco IM 15 1338 13963
Taggia IM 15 14116 28079
Vasia IM 15 389 28468
Caravonica IM 15 282 28750
Lucinasco IM 15 272 29022
Pompeiana IM 15 823 29845
Dolcedo IM 16 1415 31260
Terzorio IM 16 216 31476
Sanremo IM 16 54807 86283
Rocchetta Nervina IM 16 298 86581
Riva Ligure IM 17 2910 89491
Chiusavecchia IM 17 577 90068
Cesio IM 17 283 90351
Seborga IM 17 315 90666
Civezza IM 17 609 91275
Santo Stefano al Mare IM 17 2197 93472
Chiusanico IM 17 607 94079
Vessalico IM 18 282 94361
Armo IM 18 111 94472
Cipressa IM 18 1290 95762
Dolceacqua IM 18 2074 97836
Costarainera IM 18 828 98664
Soldano IM 18 977 99641
Ospedaletti IM 19 3367 103008
Vallebona IM 19 1310 104318
San Biagio della Cima IM 19 1329 105647
Pontedassio IM 19 2323 107970
Borghetto d'Arroscia IM 20 456 108426
San Lorenzo al Mare IM 20 1297 109723

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km N of Sanremo (54807 inhabitants)
51 Km SE of Cuneo (56081 inhabitants)
68 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 0.6 2023-04-18
09:41:49		 43.9653 7.7768 1 2024-03-01
17:18:16		 Bollettino Sismico Italiano INGV 120745931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-18 09:41:49 ± 0.18
Latitude 43.9653 ± 0.0117
Longitude 7.7768 ± 0.0137
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type quarry blast
Origin ID 120745931

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1270
Semi-minor axis of confidence ellipse (meter) 1090
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 7
Circular confidence region, given by single value of horizontal uncertainty (meter) 1270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.08004
Epicentral distance of station farthest from the epicenter (degree) 0.42718
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 120745931
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-02-07 10:31:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.STV.HHZ. 2023-04-18T09:41:58.66 0.3 undecidable manual P 311 47.4192 91 -0.59 62
GU.ENR.HHZ. 2023-04-18T09:41:57.63 0.6 undecidable manual P 316 40.9257 91 -0.31 45
GU.GBOS.HHZ. 2023-04-18T09:41:55.81 0.3 undecidable manual P 9 31.0467 91 -0.16 72
GU.RORO.HHZ. 2023-04-18T09:41:55.23 0.3 undecidable manual P 55 28.2495 91 -0.19 71
GU.BURY.HNZ. 2023-04-18T09:41:55.26 0.6 undecidable manual P 221 26.8509 91 0.14 48
FR.SAOF.HHZ.00 2023-04-18T09:41:53.65 0.1 undecidable manual P 277 17.9709 92 0.29 95
GU.MGRO.HHZ. 2023-04-18T09:41:52.12 0.1 positive manual P 16 8.88 93 0.58 89
GU.IMI.HHZ. 2023-04-18T09:41:51.88 0.1 undecidable manual P 123 11.0778 93 -0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.IMI.HHN. ML:0.7 0.0000828 0.9 AML other m 2023-04-18T09:41:53.24
GU.IMI.HHE. ML:0.6 0.0000619 0.12 AML other m 2023-04-18T09:41:54.06
GU.RORO.HHE. ML:0.4 0.000015935 1.52 AML other m 2023-04-18T09:41:59.97
GU.RORO.HHN. ML:0.7 0.00002405 0.44 AML other m 2023-04-18T09:41:59.77
FR.SAOF.HHE.00 ML:0.7 0.000042550000000000004 0.54 AML other m 2023-04-18T09:42:00.69
FR.SAOF.HHN.00 ML:0.5 0.0000308 0.44 AML other m 2023-04-18T09:42:00.58
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