Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 06-01-1987 and time 11:32:28 (Italy) in region Confine Italia Svizzera (SVIZZERA)

A magnitude Md 2.5 earthquake occured in region: Confine Italia Svizzera (SVIZZERA), on

  • 06-01-1987 10:32:28 (UTC)
  • 06-01-1987 11:32:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 46.3060, 8.1240 at 10 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
Trasquera VB 13 194 194
Varzo VB 15 2046 2240
Baceno VB 16 918 3158
Premia VB 17 564 3722
Crodo VB 18 1404 5126

Municipalities with at least 50000 inhabitants

An earthquake occurred to
77 Km NW of Varese (80799 inhabitants)
89 Km NW of Gallarate (53343 inhabitants)
92 Km NW of Como (84495 inhabitants)
95 Km NW of Busto Arsizio (83106 inhabitants)
100 Km NW of Legnano (60262 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 2.5
M 2.7 		1987-01-06
10:32:28		 46.306 8.124 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 38919
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-01-06 10:32:28 ± 0.166
Latitude 46.3060 ± 0.0104
Longitude 8.1240 ± 0.0156
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 38919

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) 1667.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 113
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00243
Epicentral distance of station farthest from the epicenter (degree) 0.01328
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 38919
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:38:59

M:2.7

Field Value
Value 2.7
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 38919
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:42:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.RSP.Z. 1987-01-06T10:33:09.80 10.0 undecidable manual SN 207 1.2987 -0.34 0.5
--.LSD.Z. 1987-01-06T10:33:04.00 10.0 undecidable manual SN 218 1.0767 -0.92 0.2
--.SLE.Z. 1987-01-06T10:32:55.00 10.0 undecidable manual PN 9 1.4763 -0.09 1.4
--.LLS.Z. 1987-01-06T10:32:55.60 10.0 undecidable manual SG 47 0.8103 -1.18 0.1
--.RSP.Z. 1987-01-06T10:32:53.30 10.0 undecidable manual PN 207 1.2987 0.67 0.7
--.ORO.Z. 1987-01-06T10:32:52.00 10.0 undecidable manual SG 188 0.6882 -0.6 0.4
--.ZLA.Z. 1987-01-06T10:32:51.80 10.0 undecidable manual PN 8 1.1766 0.75 0.6
--.ORX.Z. 1987-01-06T10:32:51.60 10.0 undecidable manual SG 188 0.6771 -0.82 0.2
--.LSD.Z. 1987-01-06T10:32:49.70 10.0 undecidable manual PN 218 1.0767 0.09 1.6
--.TMA.Z. 1987-01-06T10:32:48.50 10.0 undecidable manual SG 110 0.5439 0.06 0.8
--.DIX.Z. 1987-01-06T10:32:47.20 10.0 undecidable manual SG 245 0.5439 -0.83 0.2
--.EMS.Z. 1987-01-06T10:32:45.50 10.0 undecidable manual PG 254 0.8547 -0.22 1.7
--.LLS.Z. 1987-01-06T10:32:44.60 10.0 undecidable manual PG 47 0.8103 -0.32 1.6
--.ORO.Z. 1987-01-06T10:32:43.00 10.0 undecidable manual PG 188 0.6882 0.5 1.3
--.MUO.Z. 1987-01-06T10:32:43.70 10.0 undecidable manual PG 28 0.7659 -0.43 1.4
--.VAI.Z. 1987-01-06T10:32:41.00 10.0 undecidable manual PG 134 0.6216 -0.43 1.4
--.ORX.Z. 1987-01-06T10:32:41.60 10.0 undecidable manual PG 188 0.6771 -0.8 0.6
--.TMA.Z. 1987-01-06T10:32:40.60 10.0 undecidable manual PG 110 0.5439 0.5 1.3
--.MMK.Z. 1987-01-06T10:32:39.30 10.0 undecidable manual SG 203 0.2664 -0.21 0.7
--.DIX.Z. 1987-01-06T10:32:39.70 10.0 undecidable manual PG 245 0.5439 -0.16 1.9
--.MMK.Z. 1987-01-06T10:32:35.50 10.0 undecidable manual PG 203 0.2664 0.55 2.3
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