Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of M 2.2 on date 27-01-1987 and time 15:42:25 (UTC) in region 4 km W Montalto Ligure (IM)

A magnitude M 2.2 earthquake occured in region: 4 km W Montalto Ligure (IM), on

  • 27-01-1987 15:42:25 (UTC)
  • 27-01-1987 16:42:25 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9480, 7.7980 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
Montalto Ligure IM 4 377 377
Molini di Triora IM 5 617 994
Badalucco IM 5 1136 2130
Carpasio IM 6 168 2298
Triora IM 6 355 2653
Ceriana IM 8 1250 3903
Bajardo IM 8 312 4215
Castel Vittorio IM 10 287 4502
Rezzo IM 10 366 4868
Pietrabruna IM 11 501 5369
Aurigo IM 11 347 5716
Pigna IM 11 859 6575
Castellaro IM 11 1256 7831
Prelà IM 11 503 8334
Taggia IM 12 14116 22450
Borgomaro IM 12 865 23315
Vasia IM 13 389 23704
Pompeiana IM 13 823 24527
Apricale IM 13 629 25156
Dolcedo IM 13 1415 26571
Terzorio IM 13 216 26787
Perinaldo IM 13 870 27657
Montegrosso Pian Latte IM 13 118 27775
Lucinasco IM 14 272 28047
Caravonica IM 14 282 28329
Riva Ligure IM 14 2910 31239
Sanremo IM 14 54807 86046
Mendatica IM 14 185 86231
Civezza IM 15 609 86840
Cosio d'Arroscia IM 15 221 87061
Pieve di Teco IM 15 1338 88399
Santo Stefano al Mare IM 15 2197 90596
Isolabona IM 15 679 91275
Pornassio IM 15 685 91960
Chiusavecchia IM 15 577 92537
Cipressa IM 15 1290 93827
Costarainera IM 16 828 94655
Briga Alta CN 16 39 94694
Cesio IM 16 283 94977
Seborga IM 16 315 95292
Chiusanico IM 16 607 95899
San Lorenzo al Mare IM 17 1297 97196
Rocchetta Nervina IM 17 298 97494
Vessalico IM 17 282 97776
Pontedassio IM 17 2323 100099
Ospedaletti IM 18 3367 103466
Soldano IM 18 977 104443
Dolceacqua IM 18 2074 106517
Vallebona IM 18 1310 107827
Armo IM 18 111 107938
San Biagio della Cima IM 19 1329 109267
Borghetto d'Arroscia IM 19 456 109723
Diano Arentino IM 20 722 110445
Imperia IM 20 42034 152479
Testico SV 20 196 152675
Camporosso IM 20 5632 158307

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km N of Sanremo (54807 inhabitants)
53 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 		M 2.2 1987-01-27
15:42:25		 43.948 7.798 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 39889
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-01-27 15:42:25 ± 0.216
Latitude 43.9480 ± 0.0279
Longitude 7.7980 ± 0.0126
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 39889

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) 3259.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 197
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00065
Epicentral distance of station farthest from the epicenter (degree) 0.00672
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

M:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 39889
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
--.SOO.Z. 1987-01-27T15:42:51.30 10.0 undecidable manual SG 318 0.7437 -0.45 0.1
--.DA9.Z. 1987-01-27T15:42:49.50 10.0 undecidable manual SG 324 0.6771 -0.14 0.5
--.SOO.Z. 1987-01-27T15:42:41.10 10.0 undecidable manual PG 318 0.7437 0.32 0.7
--.STV.Z. 1987-01-27T15:42:41.60 10.0 undecidable manual SG 312 0.444 -0.68 0
--.DA9.Z. 1987-01-27T15:42:40.00 10.0 undecidable manual PG 324 0.6771 0.43 0.4
--.FIN.Z. 1987-01-27T15:42:40.00 10.0 undecidable manual SG 48 0.3885 -0.36 0.3
--.ROB.Z. 1987-01-27T15:42:39.40 10.0 undecidable manual SG 8 0.3552 0.16 0.6
--.STV.Z. 1987-01-27T15:42:35.20 10.0 undecidable manual PG 312 0.444 -0.12 1.6
--.FIN.Z. 1987-01-27T15:42:34.30 10.0 undecidable manual PG 48 0.3885 0.09 1.7
--.ROB.Z. 1987-01-27T15:42:33.60 10.0 undecidable manual PG 8 0.3552 0.04 1.8
--.IMP.Z. 1987-01-27T15:42:30.10 10.0 undecidable manual SG 114 0.0666 -0.2 0.8
--.IMP.Z. 1987-01-27T15:42:28.40 10.0 undecidable manual PG 114 0.0666 0 3.6
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