Earthquake with magnitude of M 2.2 on date 21-04-1986 and time 11:58:39 (Italy) in region W Roaschia (CN)

A magnitude M 2.2 earthquake occured in region: W Roaschia (CN), on

  • 21-04-1986 09:58:39 (UTC)
  • 21-04-1986 11:58:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.27, 7.45 at 13 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
Roaschia CN 0 107 107
Valdieri CN 5 935 1042
Entracque CN 5 774 1816
Robilante CN 6 2306 4122
Roccavione CN 6 2761 6883
Vernante CN 7 1178 8061
Borgo San Dalmazzo CN 7 12468 20529
Moiola CN 8 234 20763
Roccasparvera CN 8 741 21504
Gaiola CN 8 582 22086
Valloriate CN 10 109 22195
Rittana CN 10 109 22304
Vignolo CN 10 2600 24904
Boves CN 10 9835 34739
Limone Piemonte CN 12 1485 36224
Cervasca CN 13 5013 41237
Demonte CN 13 2003 43240
Bernezzo CN 13 4104 47344
Peveragno CN 15 5543 52887
Cuneo CN 16 56081 108968
Caraglio CN 17 6836 115804
Valgrana CN 17 786 116590
Monterosso Grana CN 19 505 117095
Beinette CN 19 3423 120518
Chiusa di Pesio CN 19 3676 124194
Aisone CN 19 248 124442
Montemale di Cuneo CN 20 241 124683

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km SW of Cuneo (56081 inhabitants)
57 Km NW of Sanremo (54807 inhabitants)
82 Km W of Savona (61345 inhabitants)
83 Km S of Moncalieri (57294 inhabitants)
91 Km S of Torino (890529 inhabitants)
92 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 2.2 1986-04-21
09:58:39
44.27 7.45 13 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 25859
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-04-21 09:58:39 ± 0.144
Latitude 44.27 ± 0.01
Longitude 7.45 ± 0.01
Depth (km) 13 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 25859

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) 1589.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 120
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00081
Epicentral distance of station farthest from the epicenter (degree) 0.0072
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 25859
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
--.RRL.Z. 1986-04-21T09:59:06.80 10.0 undecidable manual SG 323 0.0072 -0.27 0.3
--.IMP.Z. 1986-04-21T09:58:56.50 10.0 undecidable manual SG 137 0.0042 0.05 0.8
--.RRL.Z. 1986-04-21T09:58:55.40 10.0 undecidable manual PG 323 0.0072 0.07 1.4
--.ROB.Z. 1986-04-21T09:58:51.50 10.0 undecidable manual SG 83 0.0027 0.52 0.1
--.SOO.Z. 1986-04-21T09:58:51.90 10.0 undecidable manual SG 313 0.0031 -0.4 0.3
--.FIN.Z. 1986-04-21T09:58:50.10 10.0 undecidable manual PG 96 0.0049 -0.42 0.6
--.IMP.Z. 1986-04-21T09:58:49.20 10.0 undecidable manual PG 137 0.0042 0 2
--.SOO.Z. 1986-04-21T09:58:47.20 10.0 undecidable manual PG 313 0.0031 0.39 0.7
--.ROB.Z. 1986-04-21T09:58:46.00 10.0 undecidable manual PG 83 0.0027 -0.04 2.1
--.STV.Z. 1986-04-21T09:58:44.50 10.0 undecidable manual SG 258 0.0008 -0.2 0.6
--.STV.Z. 1986-04-21T09:58:42.50 10.0 undecidable manual PG 258 0.0008 0.09 2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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