Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 17-04-1987 and time 17:29:11 (Italy) in region SE Valgrana (CN)

A magnitude Md 2.1 earthquake occured in region: SE Valgrana (CN), on

  • 17-04-1987 15:29:11 (UTC)
  • 17-04-1987 17:29:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.4070, 7.3850 at 8 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
Valgrana CN 1 786 786
Montemale di Cuneo CN 4 241 1027
Caraglio CN 4 6836 7863
Bernezzo CN 5 4104 11967
Monterosso Grana CN 5 505 12472
Rittana CN 6 109 12581
Dronero CN 7 7035 19616
Cervasca CN 7 5013 24629
Valloriate CN 8 109 24738
Gaiola CN 8 582 25320
Pradleves CN 8 250 25570
Roccasparvera CN 9 741 26311
Roccabruna CN 9 1585 27896
Vignolo CN 9 2600 30496
Villar San Costanzo CN 9 1547 32043
Moiola CN 10 234 32277
Cartignano CN 11 190 32467
Borgo San Dalmazzo CN 12 12468 44935
Demonte CN 12 2003 46938
Roccavione CN 13 2761 49699
Cuneo CN 13 56081 105780
Castelmagno CN 14 66 105846
San Damiano Macra CN 14 430 106276
Busca CN 14 10181 116457
Valdieri CN 14 935 117392
Rossana CN 16 908 118300
Valmala CN 16 52 118352
Boves CN 16 9835 128187
Robilante CN 16 2306 130493
Tarantasca CN 16 2122 132615
Roaschia CN 16 107 132722
Aisone CN 17 248 132970
Venasca CN 17 1437 134407
Melle CN 18 292 134699
Celle di Macra CN 18 100 134799
Brossasco CN 18 1084 135883
Entracque CN 18 774 136657
Piasco CN 19 2774 139431
Macra CN 19 59 139490
Costigliole Saluzzo CN 19 3375 142865
Centallo CN 20 6954 149819
Villafalletto CN 20 2925 152744
Vinadio CN 20 644 153388

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km W of Cuneo (56081 inhabitants)
70 Km SW of Moncalieri (57294 inhabitants)
73 Km NW of Sanremo (54807 inhabitants)
78 Km SW of Torino (890529 inhabitants)
85 Km SW of Asti (76202 inhabitants)
88 Km W 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 		Md 2.1
M 2.1 		1987-04-17
15:29:11		 44.407 7.385 8 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 45079
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-17 15:29:11 ± 0.171
Latitude 44.4070 ± 0.0184
Longitude 7.3850 ± 0.0465
Depth (km) 8 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 45079

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) 4219.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 152
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) 0.00121
Epicentral distance of station farthest from the epicenter (degree) 0.00324
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 45079
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:44:26

M:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 45079
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
--.ROB.Z. 1987-04-17T15:29:25.50 10.0 undecidable manual SG 106 0.3552 -0.17 0.6
--.ROB.Z. 1987-04-17T15:29:20.00 10.0 undecidable manual PG 106 0.3552 0.21 1.3
--.SOO.Z. 1987-04-17T15:29:20.80 10.0 undecidable manual SG 295 0.2109 -0.06 0.8
--.DA9.Z. 1987-04-17T15:29:18.50 10.0 undecidable manual SG 313 0.1332 0.7 0.2
--.STV.Z. 1987-04-17T15:29:18.70 10.0 undecidable manual SG 194 0.1554 0.13 0.8
--.SOO.Z. 1987-04-17T15:29:17.10 10.0 undecidable manual PG 295 0.2109 0.09 1.9
--.STV.Z. 1987-04-17T15:29:15.60 10.0 undecidable manual PG 194 0.1554 -0.08 2
--.DA9.Z. 1987-04-17T15:29:14.50 10.0 undecidable manual PG 313 0.1332 -0.74 0.4
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