Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.0 on date 08-04-1987 and time 10:34:10 (Italy) in region W Altare (SV)

A magnitude Md 2.0 earthquake occured in region: W Altare (SV), on

  • 08-04-1987 08:34:10 (UTC)
  • 08-04-1987 10:34:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3350, 8.3390 at 14 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
Altare SV 1 2108 2108
Carcare SV 5 5587 7695
Pallare SV 5 923 8618
Mallare SV 6 1146 9764
Quiliano SV 7 7232 16996
Plodio SV 8 650 17646
Cairo Montenotte SV 9 13269 30915
Cosseria SV 9 1105 32020
Bormida SV 10 387 32407
Vado Ligure SV 11 8336 40743
Millesimo SV 11 3383 44126
Savona SV 12 61345 105471
Vezzi Portio SV 12 809 106280
Cengio SV 12 3563 109843
Roccavignale SV 12 752 110595
Osiglia SV 12 444 111039
Bergeggi SV 13 1129 112168
Orco Feglino SV 13 890 113058
Dego SV 13 1985 115043
Albissola Marina SV 13 5487 120530
Spotorno SV 14 3803 124333
Giusvalla SV 14 441 124774
Rialto SV 14 564 125338
Albisola Superiore SV 14 10163 135501
Stella SV 14 3009 138510
Murialdo SV 14 841 139351
Pontinvrea SV 15 847 140198
Calice Ligure SV 15 1730 141928
Noli SV 16 2736 144664
Saliceto CN 16 1323 145987
Montezemolo CN 16 259 146246
Celle Ligure SV 17 5237 151483
Castelnuovo di Ceva CN 17 110 151593
Piana Crixia SV 17 788 152381
Magliolo SV 17 974 153355
Mioglia SV 18 526 153881
Tovo San Giacomo SV 18 2582 156463
Finale Ligure SV 18 11711 168174
Camerana CN 19 631 168805
Varazze SV 19 13251 182056
Giustenice SV 19 977 183033
Borgio Verezzi SV 20 2205 185238
Gottasecca CN 20 148 185386

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km W of Savona (61345 inhabitants)
48 Km W of Genova (586655 inhabitants)
63 Km E of Cuneo (56081 inhabitants)
64 Km S of Asti (76202 inhabitants)
68 Km SW of Alessandria (93943 inhabitants)
72 Km NE of Sanremo (54807 inhabitants)
90 Km SE of Moncalieri (57294 inhabitants)
97 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 2.0
M 2.1 		1987-04-08
08:34:10		 44.335 8.339 14 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 44379
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-08 08:34:10 ± 0.76
Latitude 44.3350 ± 0.0253
Longitude 8.3390 ± 0.0495
Depth (km) 14 ± 6 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 44379

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) 4841.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 244
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00081
Epicentral distance of station farthest from the epicenter (degree) 0.00809
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:2.0

Field Value
Value 2.0
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 44379
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:43:49

M:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 44379
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. 1987-04-08T08:34:42.00 10.0 undecidable manual SG 281 0.8991 0.92 0.2
--.STV.Z. 1987-04-08T08:34:35.30 10.0 undecidable manual SG 263 0.7215 -0.21 0.7
--.IMP.Z. 1987-04-08T08:34:29.80 10.0 undecidable manual SG 217 0.5217 0.71 0.5
--.SOO.Z. 1987-04-08T08:34:27.90 10.0 undecidable manual PG 281 0.8991 -0.14 1.6
--.DA9.Z. 1987-04-08T08:34:26.80 10.0 undecidable manual PG 282 0.7881 0.64 1
--.STV.Z. 1987-04-08T08:34:25.20 10.0 undecidable manual PG 263 0.7215 0.38 1.6
--.IMP.Z. 1987-04-08T08:34:21.10 10.0 undecidable manual PG 217 0.5217 -0.02 2.2
--.ROB.Z. 1987-04-08T08:34:21.80 10.0 undecidable manual SG 264 0.333 -1.21 0.1
--.ROB.Z. 1987-04-08T08:34:16.60 10.0 undecidable manual PG 264 0.333 -1.01 0.6
--.CKI.Z. 1987-04-08T08:34:16.60 10.0 undecidable manual SG 333 0.0888 0.51 0.6
--.CKI.Z. 1987-04-08T08:34:13.20 10.0 undecidable manual PG 333 0.0888 -0.41 1.8
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