Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.3 on date 26-02-1985 and time 18:52:17 (UTC) in region 2 km NE Montenars (UD)

A magnitude Md 3.3 earthquake occured in region: 2 km NE Montenars (UD), on

  • 26-02-1985 18:52:17 (UTC)
  • 26-02-1985 19:52:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 46.2740, 13.1890 at 9 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
Montenars UD 2 538 538
Gemona del Friuli UD 4 10964 11502
Artegna UD 4 2885 14387
Magnano in Riviera UD 5 2336 16723
Lusevera UD 6 643 17366
Tarcento UD 7 9012 26378
Venzone UD 8 2117 28495
Bordano UD 8 754 29249
Osoppo UD 9 2936 32185
Buja UD 9 6563 38748
Trasaghis UD 9 2227 40975
Treppo Grande UD 9 1708 42683
Nimis UD 10 2740 45423
Cassacco UD 11 2938 48361
Taipana UD 12 636 48997
Tricesimo UD 13 7600 56597
Colloredo di Monte Albano UD 13 2223 58820
Majano UD 13 5945 64765
Attimis UD 13 1805 66570
Amaro UD 13 823 67393
Resiutta UD 14 309 67702
Resia UD 14 1033 68735
Reana del Rojale UD 14 4966 73701
Moggio Udinese UD 15 1714 75415
Cavazzo Carnico UD 16 1052 76467
Pagnacco UD 17 5044 81511
Chiusaforte UD 18 672 82183
Moruzzo UD 18 2456 84639
Forgaria nel Friuli UD 18 1786 86425
Faedis UD 18 2945 89370
Vito d'Asio PN 18 769 90139
San Daniele del Friuli UD 18 8013 98152
Tavagnacco UD 19 14910 113062
Povoletto UD 19 5471 118533
Ragogna UD 19 2909 121442
Fagagna UD 20 6385 127827
Verzegnis UD 20 863 128690
Martignacco UD 20 6924 135614
Tolmezzo UD 20 10440 146054

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km N of Udine (99169 inhabitants)
54 Km NE of Pordenone (51229 inhabitants)
83 Km NW of Trieste (204420 inhabitants)
99 Km NE of Treviso (83731 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		Md 3.3
M 3.4 		1985-02-26
18:52:17		 46.274 13.189 9 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 2599
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-26 18:52:17 ± 0.185
Latitude 46.2740 ± 0.0142
Longitude 13.1890 ± 0.0159
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2599

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) 2001.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 85
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 43
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00040
Epicentral distance of station farthest from the epicenter (degree) 0.03521
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 30
Magnitudes information

Md:3.3

Field Value
Value 3.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 2599
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:29

M:3.4

Field Value
Value 3.4
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 2599
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(km) Takeoff_angle Residual Weight
--.CK1.Z. 1985-02-26T18:53:19.50 10.0 undecidable manual PN 243 3.9072 1.84 0.1
--.MNS.Z. 1985-02-26T18:53:17.50 10.0 undecidable manual PN 185 3.8961 -0.02 0.5
--.PO9.Z. 1985-02-26T18:53:15.80 10.0 undecidable manual PN 182 3.6963 1.06 0.2
--.VAI.Z. 1985-02-26T18:53:09.20 10.0 undecidable manual PN? 263 3.0858 2.87 0
--.AS1.Z. 1985-02-26T18:53:09.50 10.0 undecidable manual PN 186 3.2301 1.2 0.2
--.AR1.Z. 1985-02-26T18:53:03.00 10.0 undecidable manual PN 183 2.775 0.92 0.4
--.CH1.Z. 1985-02-26T18:53:01.50 10.0 undecidable manual PN 198 2.775 -0.68 0.5
--.SAV.Z. 1985-02-26T18:52:55.20 10.0 undecidable manual PN? 255 2.0757 2.72 0
--.CTI.Z. 1985-02-26T18:52:54.00 10.0 undecidable manual SN 258 1.0878 -0.4 0.6
--.SAL.Z. 1985-02-26T18:52:52.50 10.0 undecidable manual PN 251 1.9536 1.58 0.2
--.PAN.Z. 1985-02-26T18:52:44.80 10.0 undecidable manual PN? 260 1.3098 2.74 0
--.TRI.Z. 1985-02-26T18:52:42.00 10.0 undecidable manual SG 144 0.6882 -0.04 0.5
--.CAV.Z. 1985-02-26T18:52:42.50 10.0 undecidable manual PN 271 1.1877 2.21 0
--.CTI.Z. 1985-02-26T18:52:39.50 10.0 positive manual PN 258 1.0878 0.63 1.8
--.CAE.Z. 1985-02-26T18:52:37.90 10.0 undecidable manual SG 243 0.5883 -0.73 0.5
--.LJU.Z. 1985-02-26T18:52:36.70 10.0 positive manual PG 103 0.9546 0.11 2.4
--.CEY.Z. 1985-02-26T18:52:36.70 10.0 undecidable manual PG 121 1.0101 -0.96 0.7
--.RCL.Z. 1985-02-26T18:52:31.70 10.0 undecidable manual SG 252 0.3885 -0.57 0.6
--.DRE.Z. 1985-02-26T18:52:30.60 10.0 undecidable manual SG 107 0.3219 0.19 0.7
--.TRI.Z. 1985-02-26T18:52:30.80 10.0 undecidable manual PG 144 0.6882 -0.93 0.7
--.ZOU.Z. 1985-02-26T18:52:30.40 10.0 undecidable manual SG 332 0.3108 0.34 0.7
--.RBL.Z. 1985-02-26T18:52:29.20 10.0 undecidable manual SG 57 0.3108 -0.55 0.4
--.CAE.Z. 1985-02-26T18:52:28.60 10.0 negative manual PG 243 0.5883 -1.16 1
--.VOY.Z. 1985-02-26T18:52:28.30 10.0 positive manual PG 116 0.5439 -0.7 1.7
--.ERT.Z. 1985-02-26T18:52:27.70 10.0 undecidable manual PG 270 0.555 -1.6 0.5
--.COL.Z. 1985-02-26T18:52:26.20 10.0 undecidable manual SG 137 0.1887 0.56 0.6
--.FO1.Z. 1985-02-26T18:52:26.50 10.0 negative manual PG 318 0.4218 -0.29 2.2
--.FOA.Z. 1985-02-26T18:52:26.20 10.0 undecidable manual PG 317 0.4218 -0.54 2
--.UDI.Z. 1985-02-26T18:52:25.80 10.0 undecidable manual SG 171 0.2109 -0.54 0.6
--.RCL.Z. 1985-02-26T18:52:25.30 10.0 negative manual PG 252 0.3885 -0.8 1.6
--.ZOU.Z. 1985-02-26T18:52:24.60 10.0 positive manual PG 332 0.3108 -0.21 2.3
--.RBL.Z. 1985-02-26T18:52:24.70 10.0 positive manual PG 57 0.3108 0.06 2.4
--.MPR.Z. 1985-02-26T18:52:24.00 10.0 undecidable manual SG 256 0.1332 0.1 0.7
--.DRE.Z. 1985-02-26T18:52:24.60 10.0 positive manual PG 107 0.3219 -0.41 2.1
--.BAD.Z. 1985-02-26T18:52:22.30 10.0 undecidable manual SG 135 0.0444 1.02 0.4
--.UDI.Z. 1985-02-26T18:52:22.40 10.0 undecidable manual PG 171 0.2109 -0.27 2.3
--.BOO.Z. 1985-02-26T18:52:22.80 10.0 undecidable manual SG 306 0.0666 0.95 0.4
--.COL.Z. 1985-02-26T18:52:22.50 10.0 undecidable manual PG 137 0.1887 0.24 1.1
--.BUA.Z. 1985-02-26T18:52:21.80 10.0 undecidable manual SG 219 0.0666 0.06 0.7
--.MPR.Z. 1985-02-26T18:52:20.90 10.0 positive manual PG 256 0.1332 -0.36 2.2
--.BAD.Z. 1985-02-26T18:52:20.10 10.0 positive manual PG 135 0.0444 0.36 2.2
--.BOO.Z. 1985-02-26T18:52:20.30 10.0 negative manual PG 306 0.0666 0.23 2.3
--.BUA.Z. 1985-02-26T18:52:19.80 10.0 negative manual PG 219 0.0666 -0.21 2.3
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download