ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of M 2.0 on date 02-04-1987 and time 13:30:58 (Italy) in region 3 km NE Valdieri (CN)

A magnitude M 2.0 earthquake occured in region: 3 km NE Valdieri (CN), on

  • 02-04-1987 11:30:58 (UTC)
  • 02-04-1987 13:30:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.29, 7.43 at 12 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Valdieri CN 3 935 935
Roaschia CN 3 107 1042
Moiola CN 4 234 1276
Roccavione CN 5 2761 4037
Gaiola CN 5 582 4619
Roccasparvera CN 6 741 5360
Borgo San Dalmazzo CN 6 12468 17828
Entracque CN 6 774 18602
Robilante CN 7 2306 20908
Valloriate CN 7 109 21017
Rittana CN 7 109 21126
Vignolo CN 8 2600 23726
Vernante CN 10 1178 24904
Cervasca CN 11 5013 29917
Boves CN 11 9835 39752
Bernezzo CN 11 4104 43856
Demonte CN 11 2003 45859
Valgrana CN 14 786 46645
Caraglio CN 14 6836 53481
Cuneo CN 15 56081 109562
Monterosso Grana CN 15 505 110067
Peveragno CN 16 5543 115610
Limone Piemonte CN 16 1485 117095
Aisone CN 17 248 117343
Montemale di Cuneo CN 17 241 117584
Pradleves CN 18 250 117834
Beinette CN 19 3423 121257
Dronero CN 20 7035 128292

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km SW of Cuneo (56081 inhabitants)
60 Km NW of Sanremo (54807 inhabitants)
81 Km S of Moncalieri (57294 inhabitants)
84 Km W of Savona (61345 inhabitants)
89 Km S of Torino (890529 inhabitants)
91 Km SW of Asti (76202 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
Rev 1000 M 2.0 1987-04-02
11:30:58
44.29 7.43 12 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 44029
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-02 11:30:58 ± 0.25
Latitude 44.29 ± 0.02
Longitude 7.43 ± 0.01
Depth (km) 12 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 44029

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) 2350.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 141
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
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) 0.00073
Epicentral distance of station farthest from the epicenter (degree) 0.00502
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

M:2

Field Value
Value 2
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 44029
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 Takeoff_angle Residual Weight
--.FIN.Z. 1987-04-02T11:31:19.00 10.0 undecidable manual SG 98 0.005 0.06 0.6
--.ROB.Z. 1987-04-02T11:31:11.30 10.0 undecidable manual SG 88 0.0028 0.27 0.4
--.FIN.Z. 1987-04-02T11:31:10.10 10.0 undecidable manual PG 98 0.005 -0.38 0.4
--.SOO.Z. 1987-04-02T11:31:10.60 10.0 undecidable manual SG 311 0.0028 -0.39 0.2
--.DA9.Z. 1987-04-02T11:31:08.50 10.0 undecidable manual SG 327 0.0022 -0.31 0.4
--.SOO.Z. 1987-04-02T11:31:06.10 10.0 undecidable manual PG 311 0.0028 0.21 1.4
--.ROB.Z. 1987-04-02T11:31:06.00 10.0 undecidable manual PG 88 0.0028 0.09 2
--.DA9.Z. 1987-04-02T11:31:04.80 10.0 undecidable manual PG 327 0.0022 0.17 1.7
--.STV.Z. 1987-04-02T11:31:03.80 10.0 undecidable manual SG 239 0.0007 -0.13 0.8
--.STV.Z. 1987-04-02T11:31:01.90 10.0 undecidable manual PG 239 0.0007 0.09 2.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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