Earthquake with magnitude of Md 2.1 on date 20-02-1985 and time 21:37:00 (UTC) in region 2 km W Comeglians (UD)

A magnitude Md 2.1 earthquake occured in region: 2 km W Comeglians (UD), on

  • 20-02-1985 21:37:00 (UTC)
  • 20-02-1985 22:37:00 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 46.51, 12.85 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Comeglians UD 2 516 516
Ovaro UD 3 1922 2438
Prato Carnico UD 4 904 3342
Rigolato UD 4 448 3790
Ravascletto UD 6 536 4326
Raveo UD 9 458 4784
Forni Avoltri UD 10 588 5372
Cercivento UD 11 679 6051
Sutrio UD 11 1332 7383
Ampezzo UD 11 1006 8389
Enemonzo UD 11 1319 9708
Sauris UD 12 416 10124
Lauco UD 12 729 10853
Socchieve UD 12 908 11761
Villa Santina UD 12 2233 13994
Preone UD 13 246 14240
Paluzza UD 13 2217 16457
Sappada BL 14 1317 17774
Arta Terme UD 14 2171 19945
Zuglio UD 15 595 20540
Treppo Carnico UD 15 618 21158
Tolmezzo UD 17 10440 31598
Verzegnis UD 18 863 32461
Ligosullo UD 18 116 32577
Forni di Sotto UD 19 600 33177

Municipalities with at least 50000 inhabitants

An earthquake occurred to
58 Km NW of Udine (99169 inhabitants)
63 Km N of Pordenone (51229 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 Md 2.1
M 2.4
1985-02-20
21:37:00
46.51 12.85 10 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 2049
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-20 21:37:00 ± 0.631
Latitude 46.51 ± 0.05
Longitude 12.85 ± 0.04
Depth (km) 10 ± 13 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2049

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) 6073.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 163
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) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00081
Epicentral distance of station farthest from the epicenter (degree) 0.0085
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 2049
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:03

M:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 2049
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
--.CTI.Z. 1985-02-20T21:37:32.50 10.0 undecidable manual SG 241 0.0085 -0.72 0.1
--.CTI.Z. 1985-02-20T21:37:20.00 10.0 undecidable manual PG 241 0.0085 0.43 0.5
--.BAD.Z. 1985-02-20T21:37:15.60 10.0 undecidable manual SG 134 0.0035 0.34 0.4
--.BUA.Z. 1985-02-20T21:37:15.00 10.0 undecidable manual SG 146 0.0031 0.95 0
--.BOO.Z. 1985-02-20T21:37:11.00 10.0 undecidable manual SG 137 0.0023 -0.13 0.9
--.BAD.Z. 1985-02-20T21:37:09.10 10.0 undecidable manual PG 134 0.0035 -0.09 1.5
--.BUA.Z. 1985-02-20T21:37:08.50 10.0 undecidable manual PG 146 0.0031 0.01 1.6
--.BOO.Z. 1985-02-20T21:37:06.40 10.0 negative manual PG 137 0.0023 -0.41 1.7
--.FO1.Z. 1985-02-20T21:37:05.50 10.0 undecidable manual SG 331 0.0008 -0.47 0.4
--.FO1.Z. 1985-02-20T21:37:04.00 10.0 negative manual PG 331 0.0008 0.16 2.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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