Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.3 on date 20-02-1985 and time 22:39:18 (Italy) in region 5 km S Prato Carnico (UD)

A magnitude Md 2.3 earthquake occured in region: 5 km S Prato Carnico (UD), on

  • 20-02-1985 21:39:18 (UTC)
  • 20-02-1985 22:39:18 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 46.4760, 12.7970 at 7 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
Prato Carnico UD 5 904 904
Ovaro UD 5 1922 2826
Ampezzo UD 7 1006 3832
Sauris UD 7 416 4248
Comeglians UD 7 516 4764
Raveo UD 7 458 5222
Socchieve UD 8 908 6130
Rigolato UD 9 448 6578
Enemonzo UD 10 1319 7897
Preone UD 11 246 8143
Ravascletto UD 11 536 8679
Villa Santina UD 12 2233 10912
Lauco UD 12 729 11641
Forni Avoltri UD 12 588 12229
Forni di Sotto UD 13 600 12829
Sappada BL 13 1317 14146
Sutrio UD 15 1332 15478
Cercivento UD 16 679 16157
Arta Terme UD 18 2171 18328
Forni di Sopra UD 18 993 19321
Zuglio UD 18 595 19916
Paluzza UD 18 2217 22133
Verzegnis UD 18 863 22996
Tramonti di Sopra PN 18 321 23317
Tolmezzo UD 19 10440 33757
San Pietro di Cadore BL 19 1624 35381

Municipalities with at least 50000 inhabitants

An earthquake occurred to
57 Km NW of Udine (99169 inhabitants)
59 Km N of Pordenone (51229 inhabitants)
99 Km NE of Treviso (83731 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 2.3
M 2.5 		1985-02-20
21:39:18		 46.476 12.797 7 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 2059
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-20 21:39:18 ± 0.118
Latitude 46.4760 ± 0.0053
Longitude 12.7970 ± 0.0104
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2059

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) 984.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 112
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
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) 0.00105
Epicentral distance of station farthest from the epicenter (degree) 0.00809
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 2059
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:04

M:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 2059
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:39:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.CTI.Z. 1985-02-20T21:39:49.00 10.0 undecidable manual SG 241 0.8991 -0.43 0.1
--.DRE.Z. 1985-02-20T21:39:41.50 10.0 undecidable manual SG 117 0.6549 -0.15 0.4
--.CTI.Z. 1985-02-20T21:39:37.00 10.0 undecidable manual PG 241 0.8991 0.83 0.1
--.COL.Z. 1985-02-20T21:39:37.70 10.0 undecidable manual SG 130 0.5217 0.23 0.5
--.BAD.Z. 1985-02-20T21:39:32.80 10.0 undecidable manual SG 127 0.3885 -0.26 0.7
--.BUA.Z. 1985-02-20T21:39:31.60 10.0 undecidable manual SG 138 0.3441 0.12 0.6
--.DRE.Z. 1985-02-20T21:39:31.40 10.0 undecidable manual PG 117 0.6549 -0.28 0.8
--.RCL.Z. 1985-02-20T21:39:30.40 10.0 undecidable manual SG 197 0.3219 -0.66 0.1
--.COL.Z. 1985-02-20T21:39:29.50 10.0 undecidable manual PG 130 0.5217 0.23 1.3
--.BOO.Z. 1985-02-20T21:39:28.90 10.0 undecidable manual SG 126 0.2553 0.48 0.3
--.MPR.Z. 1985-02-20T21:39:28.30 10.0 undecidable manual SG 150 0.2553 -0.42 0.3
--.BUA.Z. 1985-02-20T21:39:26.20 10.0 undecidable manual PG 138 0.3441 0.39 0.9
--.BAD.Z. 1985-02-20T21:39:26.60 10.0 undecidable manual PG 127 0.3885 -0.12 1.6
--.RCL.Z. 1985-02-20T21:39:25.70 10.0 undecidable manual PG 197 0.3219 0.14 1.7
--.MPR.Z. 1985-02-20T21:39:24.10 10.0 undecidable manual PG 150 0.2553 -0.12 1.6
--.ZOU.Z. 1985-02-20T21:39:24.10 10.0 undecidable manual SG 56 0.1443 -0.09 1
--.FO1.Z. 1985-02-20T21:39:23.00 10.0 undecidable manual SG 354 0.1221 -0.23 0.7
--.BOO.Z. 1985-02-20T21:39:23.70 10.0 undecidable manual PG 126 0.2553 -0.34 1
--.FO1.Z. 1985-02-20T21:39:21.00 10.0 negative manual PG 354 0.1221 -0.05 3.3
--.ZOU.Z. 1985-02-20T21:39:21.80 10.0 positive manual PG 56 0.1443 0.2 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