Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of M 2.4 on date 16-04-1987 and time 17:50:14 (Italy) in region 4 km SE Molini di Triora (IM)

A magnitude M 2.4 earthquake occured in region: 4 km SE Molini di Triora (IM), on

  • 16-04-1987 15:50:14 (UTC)
  • 16-04-1987 17:50:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.9620, 7.8100 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
Molini di Triora IM 4 617 617
Carpasio IM 5 168 785
Montalto Ligure IM 5 377 1162
Triora IM 5 355 1517
Badalucco IM 6 1136 2653
Rezzo IM 8 366 3019
Aurigo IM 9 347 3366
Ceriana IM 9 1250 4616
Bajardo IM 10 312 4928
Pietrabruna IM 11 501 5429
Borgomaro IM 11 865 6294
Prelà IM 11 503 6797
Castel Vittorio IM 11 287 7084
Castellaro IM 12 1256 8340
Montegrosso Pian Latte IM 12 118 8458
Vasia IM 12 389 8847
Pigna IM 12 859 9706
Lucinasco IM 12 272 9978
Caravonica IM 13 282 10260
Pieve di Teco IM 13 1338 11598
Mendatica IM 13 185 11783
Cosio d'Arroscia IM 13 221 12004
Dolcedo IM 13 1415 13419
Pornassio IM 13 685 14104
Taggia IM 14 14116 28220
Pompeiana IM 14 823 29043
Terzorio IM 14 216 29259
Chiusavecchia IM 14 577 29836
Cesio IM 14 283 30119
Briga Alta CN 14 39 30158
Civezza IM 15 609 30767
Chiusanico IM 15 607 31374
Apricale IM 15 629 32003
Riva Ligure IM 15 2910 34913
Perinaldo IM 15 870 35783
Vessalico IM 16 282 36065
Santo Stefano al Mare IM 16 2197 38262
Cipressa IM 16 1290 39552
Sanremo IM 16 54807 94359
Costarainera IM 16 828 95187
Isolabona IM 16 679 95866
Armo IM 16 111 95977
Pontedassio IM 17 2323 98300
San Lorenzo al Mare IM 17 1297 99597
Borghetto d'Arroscia IM 18 456 100053
Seborga IM 18 315 100368
Testico SV 18 196 100564
Rocchetta Nervina IM 19 298 100862
Diano Arentino IM 19 722 101584
Ospedaletti IM 19 3367 104951
Imperia IM 19 42034 146985
Soldano IM 19 977 147962
Dolceacqua IM 20 2074 150036
Ranzo IM 20 557 150593
Vallebona IM 20 1310 151903

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km N of Sanremo (54807 inhabitants)
52 Km SE of Cuneo (56081 inhabitants)
66 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 		M 2.4 1987-04-16
15:50:14		 43.962 7.81 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 44959
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-16 15:50:14 ± 0.224
Latitude 43.9620 ± 0.0150
Longitude 7.8100 ± 0.0252
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 44959

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 2614.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 183
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00065
Epicentral distance of station farthest from the epicenter (degree) 0.00607
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

M:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 44959
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:50:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.DA9.Z. 1987-04-16T15:50:37.60 10.0 undecidable manual SG 323 0.6771 -0.63 0.2
--.STV.Z. 1987-04-16T15:50:30.20 10.0 undecidable manual SG 310 0.444 -0.78 0.2
--.DA9.Z. 1987-04-16T15:50:29.20 10.0 undecidable manual PG 323 0.6771 0.95 0.3
--.ROB.Z. 1987-04-16T15:50:27.40 10.0 undecidable manual SG 7 0.3441 -0.16 0.7
--.STV.Z. 1987-04-16T15:50:24.10 10.0 undecidable manual PG 310 0.444 0.04 1.9
--.ROB.Z. 1987-04-16T15:50:22.20 10.0 undecidable manual PG 7 0.3441 0.11 2
--.IMP.Z. 1987-04-16T15:50:19.00 10.0 undecidable manual SG 126 0.0666 -0.13 0.7
--.IMP.Z. 1987-04-16T15:50:17.20 10.0 undecidable manual PG 126 0.0666 -0.02 2
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