Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 20-02-1985 and time 23:16:28 (Italy) in region 5 km N Ampezzo (UD)

A magnitude Md 2.5 earthquake occured in region: 5 km N Ampezzo (UD), on

  • 20-02-1985 22:16:28 (UTC)
  • 20-02-1985 23:16:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 46.4650, 12.7900 at 3 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
Ampezzo UD 5 1006 1006
Sauris UD 6 416 1422
Ovaro UD 6 1922 3344
Prato Carnico UD 6 904 4248
Raveo UD 7 458 4706
Socchieve UD 7 908 5614
Comeglians UD 8 516 6130
Enemonzo UD 9 1319 7449
Preone UD 10 246 7695
Rigolato UD 11 448 8143
Villa Santina UD 12 2233 10376
Forni di Sotto UD 12 600 10976
Lauco UD 12 729 11705
Ravascletto UD 12 536 12241
Forni Avoltri UD 14 588 12829
Sappada BL 14 1317 14146
Sutrio UD 16 1332 15478
Forni di Sopra UD 17 993 16471
Cercivento UD 17 679 17150
Tramonti di Sopra PN 17 321 17471
Verzegnis UD 18 863 18334
Arta Terme UD 18 2171 20505
Zuglio UD 18 595 21100
Tolmezzo UD 19 10440 31540
Paluzza UD 19 2217 33757
San Pietro di Cadore BL 20 1624 35381
Tramonti di Sotto PN 20 387 35768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
56 Km NW of Udine (99169 inhabitants)
58 Km N of Pordenone (51229 inhabitants)
98 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 2.5
M 2.6 		1985-02-20
22:16:28		 46.465 12.79 3 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 2069
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-20 22:16:28 ± 0.158
Latitude 46.4650 ± 0.0072
Longitude 12.7900 ± 0.0128
Depth (km) 3 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2069

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) 1263.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 30
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) 0.00113
Epicentral distance of station farthest from the epicenter (degree) 0.01125
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 2069
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:04

M:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 2069
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
--.PAN.Z. 1985-02-20T22:17:07.80 10.0 undecidable manual SN 248 1.0989 0.17 0.5
--.VOY.Z. 1985-02-20T22:17:01.30 10.0 undecidable manual SG 119 0.8769 0.96 0.2
--.DRE.Z. 1985-02-20T22:16:54.10 10.0 undecidable manual SG 115 0.6549 0.81 0.4
--.DDS.Z. 1985-02-20T22:16:54.20 10.0 undecidable manual PN 242 1.2543 0.93 0.4
--.PAN.Z. 1985-02-20T22:16:51.40 10.0 undecidable manual PN 248 1.0989 0.15 1.2
--.TRI.Z. 1985-02-20T22:16:50.50 10.0 undecidable manual PG 137 1.0101 0.93 0.4
--.COL.Z. 1985-02-20T22:16:48.60 10.0 undecidable manual SG 128 0.5217 -0.41 0.6
--.CAE.Z. 1985-02-20T22:16:48.30 10.0 undecidable manual SG 208 0.5106 -0.54 0.5
--.RBL.Z. 1985-02-20T22:16:48.50 10.0 undecidable manual SG 92 0.5328 -0.9 0.3
--.CTI.Z. 1985-02-20T22:16:48.50 10.0 undecidable manual PG? 242 0.888 1.2 0.1
--.VOY.Z. 1985-02-20T22:16:46.00 10.0 undecidable manual PG? 119 0.8769 -1.05 0.1
--.BAD.Z. 1985-02-20T22:16:43.80 10.0 undecidable manual SG 125 0.3885 -0.02 0.7
--.BUA.Z. 1985-02-20T22:16:43.10 10.0 undecidable manual SG 136 0.333 1.2 0.1
--.RBL.Z. 1985-02-20T22:16:41.50 10.0 undecidable manual PG? 92 0.5328 0.77 0.3
--.DRE.Z. 1985-02-20T22:16:41.60 10.0 undecidable manual PG 115 0.6549 -1.37 0.1
--.RCL.Z. 1985-02-20T22:16:41.30 10.0 undecidable manual SG 197 0.3108 0.11 1.1
--.BOO.Z. 1985-02-20T22:16:39.10 10.0 undecidable manual SG 123 0.2553 0.23 1
--.MPR.Z. 1985-02-20T22:16:39.60 10.0 undecidable manual SG 148 0.2553 0.6 0.7
--.COL.Z. 1985-02-20T22:16:39.70 10.0 undecidable manual PG 128 0.5217 -0.8 0.8
--.CAE.Z. 1985-02-20T22:16:39.70 10.0 undecidable manual PG 208 0.5106 -0.7 1
--.BAD.Z. 1985-02-20T22:16:37.00 10.0 undecidable manual PG 125 0.3885 -0.51 1.3
--.RCL.Z. 1985-02-20T22:16:36.50 10.0 undecidable manual PG 197 0.3108 0.51 1.3
--.BUA.Z. 1985-02-20T22:16:36.10 10.0 undecidable manual PG 136 0.333 -0.3 1.6
--.ZOU.Z. 1985-02-20T22:16:35.20 10.0 undecidable manual SG 53 0.1554 0.23 1
--.ERT.Z. 1985-02-20T22:16:35.70 10.0 undecidable manual PG 236 0.333 -0.79 0.8
--.MPR.Z. 1985-02-20T22:16:34.70 10.0 undecidable manual PG 148 0.2553 -0.02 1.8
--.BOO.Z. 1985-02-20T22:16:34.50 10.0 negative manual PG 123 0.2553 -0.15 3.6
--.FO1.Z. 1985-02-20T22:16:33.50 10.0 undecidable manual SG 357 0.1221 -0.45 0.9
--.FO1.Z. 1985-02-20T22:16:32.00 10.0 negative manual PG 357 0.1221 0.19 3.5
--.ZOU.Z. 1985-02-20T22:16:32.60 10.0 positive manual PG 53 0.1554 0.2 3.5
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