Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.2 on date 04-08-1987 and time 11:35:10 (Italy) in region 2 km N Osiglia (SV)

A magnitude Md 2.2 earthquake occured in region: 2 km N Osiglia (SV), on

  • 04-08-1987 09:35:10 (UTC)
  • 04-08-1987 11:35:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3000, 8.1960 at 7 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
Osiglia SV 2 444 444
Murialdo SV 3 841 1285
Bormida SV 4 387 1672
Roccavignale SV 7 752 2424
Pallare SV 7 923 3347
Millesimo SV 7 3383 6730
Plodio SV 8 650 7380
Castelnuovo di Ceva CN 8 110 7490
Mallare SV 8 1146 8636
Cosseria SV 8 1105 9741
Calizzano SV 10 1475 11216
Perlo CN 10 116 11332
Montezemolo CN 10 259 11591
Cengio SV 10 3563 15154
Massimino SV 10 113 15267
Carcare SV 10 5587 20854
Rialto SV 11 564 21418
Nucetto CN 12 430 21848
Priero CN 12 529 22377
Bagnasco CN 12 1035 23412
Altare SV 13 2108 25520
Magliolo SV 13 974 26494
Cairo Montenotte SV 13 13269 39763
Saliceto CN 13 1323 41086
Bardineto SV 13 756 41842
Calice Ligure SV 13 1730 43572
Orco Feglino SV 14 890 44462
Sale delle Langhe CN 14 486 44948
Camerana CN 14 631 45579
Sale San Giovanni CN 15 183 45762
Giustenice SV 15 977 46739
Tovo San Giacomo SV 15 2582 49321
Battifollo CN 15 219 49540
Priola CN 15 701 50241
Vezzi Portio SV 15 809 51050
Ceva CN 16 5782 56832
Scagnello CN 17 194 57026
Lisio CN 17 201 57227
Quiliano SV 17 7232 64459
Garessio CN 17 3244 67703
Paroldo CN 18 211 67914
Borgio Verezzi SV 18 2205 70119
Pietra Ligure SV 18 8992 79111
Gottasecca CN 18 148 79259
Viola CN 18 391 79650
Boissano SV 18 2492 82142
Finale Ligure SV 19 11711 93853
Roascio CN 19 97 93950
Dego SV 19 1985 95935
Toirano SV 19 2644 98579
Mombasiglio CN 19 609 99188
Erli SV 19 245 99433
Balestrino SV 19 595 100028
Monesiglio CN 20 645 100673
Vado Ligure SV 20 8336 109009
Torresina CN 20 52 109061
Spotorno SV 20 3803 112864
Loano SV 20 11407 124271
Castelvecchio di Rocca Barbena SV 20 145 124416

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km W of Savona (61345 inhabitants)
52 Km E of Cuneo (56081 inhabitants)
60 Km W of Genova (586655 inhabitants)
63 Km NE of Sanremo (54807 inhabitants)
67 Km S of Asti (76202 inhabitants)
76 Km SW of Alessandria (93943 inhabitants)
88 Km SE of Moncalieri (57294 inhabitants)
95 Km SE of Torino (890529 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 		Md 2.2
M 2.7 		1987-08-04
09:35:10		 44.3 8.196 7 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 53359
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-08-04 09:35:10 ± 0.44
Latitude 44.3000 ± 0.0226
Longitude 8.1960 ± 0.0298
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 53359

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) 3457.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 247
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00081
Epicentral distance of station farthest from the epicenter (degree) 0.00720
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 53359
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:51:28

M:2.7

Field Value
Value 2.7
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 53359
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:48:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.PZZ.Z. 1987-08-04T09:35:38.90 10.0 undecidable manual SG 285 0.7992 0.19 0.3
--.DOI.Z. 1987-08-04T09:35:35.20 10.0 undecidable manual SG 287 0.6993 -0.32 0.1
--.STV.Z. 1987-08-04T09:35:32.90 10.0 undecidable manual SG 265 0.6216 0.17 0.4
--.PZZ.Z. 1987-08-04T09:35:26.40 10.0 undecidable manual PG 285 0.7992 -0.33 0.3
--.DOI.C. 1987-08-04T09:35:25.30 10.0 negative manual PG 287 0.6993 0.41 0.1
--.STV.Z. 1987-08-04T09:35:23.20 10.0 undecidable manual PG 265 0.6216 -0.08 1.2
--.IMI.Z. 1987-08-04T09:35:20.00 10.0 undecidable manual PG 209 0.444 -0.02 1.3
--.ROB.Z. 1987-08-04T09:35:15.70 10.0 undecidable manual PG 270 0.222 -0.01 2.7
--.FIN.Z. 1987-08-04T09:35:12.90 10.0 undecidable manual PG 174 0.0888 0 2.7
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