Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.9 on date 04-07-1986 and time 16:44:45 (UTC) in region 2 km SE Venzone (UD)

A magnitude Md 2.9 earthquake occured in region: 2 km SE Venzone (UD), on

  • 04-07-1986 16:44:45 (UTC)
  • 04-07-1986 18:44:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 46.3200, 13.1530 at 12 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
Venzone UD 2 2117 2117
Bordano UD 4 754 2871
Gemona del Friuli UD 5 10964 13835
Trasaghis UD 7 2227 16062
Montenars UD 7 538 16600
Amaro UD 8 823 17423
Artegna UD 9 2885 20308
Osoppo UD 9 2936 23244
Resiutta UD 10 309 23553
Magnano in Riviera UD 10 2336 25889
Cavazzo Carnico UD 10 1052 26941
Lusevera UD 10 643 27584
Moggio Udinese UD 11 1714 29298
Buja UD 12 6563 35861
Tarcento UD 13 9012 44873
Resia UD 13 1033 45906
Treppo Grande UD 14 1708 47614
Tolmezzo UD 14 10440 58054
Verzegnis UD 15 863 58917
Chiusaforte UD 16 672 59589
Nimis UD 16 2740 62329
Majano UD 16 5945 68274
Cassacco UD 16 2938 71212
Taipana UD 17 636 71848
Colloredo di Monte Albano UD 17 2223 74071
Forgaria nel Friuli UD 18 1786 75857
Vito d'Asio PN 18 769 76626
Tricesimo UD 18 7600 84226
Zuglio UD 19 595 84821
Attimis UD 19 1805 86626
Dogna UD 19 175 86801
Arta Terme UD 20 2171 88972

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km N of Udine (99169 inhabitants)
56 Km NE of Pordenone (51229 inhabitants)
88 Km NW of Trieste (204420 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 2.9 1986-07-04
16:44:45		 46.32 13.153 12 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 30609
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-07-04 16:44:45 ± 0.097
Latitude 46.3200 ± 0.0052
Longitude 13.1530 ± 0.0079
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 30609

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) 841.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 29
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) 0.00032
Epicentral distance of station farthest from the epicenter (degree) 0.01044
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitude information

Md:2.9

Field Value
Value 2.9
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 30609
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:31:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.TRI.Z. 1986-07-04T16:45:12.00 10.0 undecidable manual SG 144 0.7326 0.92 0
--.CAV.Z. 1986-07-04T16:45:07.00 10.0 undecidable manual PN 269 1.1544 -0.14 0.7
--.CTI.Z. 1986-07-04T16:45:06.50 10.0 undecidable manual PN 255 1.0656 0.63 0.2
--.ERT.Z. 1986-07-04T16:45:04.40 10.0 undecidable manual SG 265 0.5328 -0.07 0.7
--.TRI.Z. 1986-07-04T16:45:01.00 10.0 undecidable manual PG 144 0.7326 0.82 0.1
--.RCL.Z. 1986-07-04T16:44:59.30 10.0 undecidable manual SG 245 0.3774 -0.13 0.8
--.TAL.Z. 1986-07-04T16:44:59.40 10.0 undecidable manual SG 185 0.3996 -0.64 0.2
--.FOA.Z. 1986-07-04T16:44:59.20 10.0 undecidable manual SG 315 0.3663 0.03 0.6
--.FO1.Z. 1986-07-04T16:44:59.00 10.0 undecidable manual SG 317 0.3663 -0.26 0.7
--.DRE.Z. 1986-07-04T16:44:58.80 10.0 undecidable manual SG 113 0.3663 -0.29 0.6
--.CAE.Z. 1986-07-04T16:44:57.10 10.0 undecidable manual PG 237 0.5883 -0.14 1.1
--.RBL.Z. 1986-07-04T16:44:57.36 10.0 undecidable manual SG 66 0.3108 0.16 0.5
--.ERT.Z. 1986-07-04T16:44:57.10 10.0 undecidable manual PG 265 0.5328 0.74 0.1
--.ZOU.Z. 1986-07-04T16:44:55.80 10.0 undecidable manual SG 332 0.2553 -0.01 0.9
--.UDI.Z. 1986-07-04T16:44:55.40 10.0 undecidable manual SG 167 0.2553 -0.22 0.7
--.FOA.Z. 1986-07-04T16:44:53.70 10.0 undecidable manual PG 315 0.3663 0.4 0.8
--.FO1.Z. 1986-07-04T16:44:53.00 10.0 negative manual PG 317 0.3663 -0.35 1.8
--.RCL.Z. 1986-07-04T16:44:53.10 10.0 undecidable manual PG 245 0.3774 -0.35 0.9
--.TAL.Z. 1986-07-04T16:44:53.40 10.0 undecidable manual PG 185 0.3996 -0.41 0.8
--.DRE.Z. 1986-07-04T16:44:52.70 10.0 undecidable manual PG 113 0.3663 -0.55 0.4
--.RBL.Z. 1986-07-04T16:44:52.00 10.0 undecidable manual PG 66 0.3108 -0.16 1.3
--.UDI.Z. 1986-07-04T16:44:51.10 10.0 negative manual PG 167 0.2553 -0.15 2.7
--.ZOU.I. 1986-07-04T16:44:51.30 10.0 negative manual PG 332 0.2553 -0.06 1.5
--.BUA.Z. 1986-07-04T16:44:50.80 10.0 undecidable manual SG 191 0.0999 -0.06 0.9
--.BAD.Z. 1986-07-04T16:44:50.90 10.0 undecidable manual SG 142 0.0999 0.02 0.9
--.BOO.Z. 1986-07-04T16:44:49.70 10.0 undecidable manual SG 270 0.0333 0.16 0.8
--.BAD.Z. 1986-07-04T16:44:48.70 10.0 positive manual PG 142 0.0999 0.18 2.6
--.BUA.Z. 1986-07-04T16:44:48.60 10.0 positive manual PG 191 0.0999 0.1 2.8
--.BOO.Z. 1986-07-04T16:44:47.80 10.0 positive manual PG 270 0.0333 0.06 2.9
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