Earthquake with magnitude of ML-VAX 4.0 on date 21-04-1985 and time 18:13:21 (UTC) in region Croatia [Land]

A magnitude ML-VAX 4.0 earthquake occured in region: Croatia [Land], on

  • 21-04-1985 18:13:21 (UTC)
  • 21-04-1985 20:13:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.8600, 16.5480 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 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
ML-VAX 4.0 1985-04-21
18:13:21
43.86 16.548 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 5209
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-21 18:13:21 ± 0.164
Latitude 43.8600 ± 0.0143
Longitude 16.5480 ± 0.0215
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 5209

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) 2348.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 121
Number of associated phases, regardless of their use for origin computation 78
Number of defining phases 78
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.01214
Epicentral distance of station farthest from the epicenter (degree) 0.06435
Number of stations at which the event was observed 65
Number of stations from which data was used for origin computation 65
Magnitude information

ML:4.0

Field Value
Value 4.0
Uncertainty
Num. used stations 11
Type of magnitude ML
Reference to an origin 5209
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.STV.Z. 1985-04-21T18:16:11.00 10.0 undecidable manual SN 277 0.0597 1.59 0.1
--.ROB.Z. 1985-04-21T18:16:02.00 10.0 undecidable manual SN 278 0.0561 1.81 0.1
--.ORO.Z. 1985-04-21T18:16:01.50 10.0 undecidable manual SN 290 0.0569 -0.81 0.3
--.VAI.N. 1985-04-21T18:15:49.30 10.0 undecidable manual SN 294 0.0527 -1.88 0.1
--.SAL.Z. 1985-04-21T18:15:22.00 10.0 undecidable manual SN 295 0.0415 0.4 0.7
--.ROI.Z. 1985-04-21T18:15:16.50 10.0 undecidable manual SN 181 0.0385 2.77 0
--.CTI.Z. 1985-04-21T18:15:10.00 10.0 undecidable manual SN 305 0.0368 0.79 0.4
--.CSI.Z. 1985-04-21T18:15:09.80 10.0 undecidable manual SN 183 0.0367 1.01 0.3
--.FRF.Z. 1985-04-21T18:15:05.00 10.0 undecidable manual PN 272 0.0644 -0.59 0.8
--.FO1.Z. 1985-04-21T18:15:04.00 10.0 undecidable manual SN 318 0.0342 1.64 0.1
--.STV.Z. 1985-04-21T18:14:57.50 10.0 undecidable manual PN 277 0.0597 -0.88 0.7
--.ORO.Z. 1985-04-21T18:14:53.00 10.0 undecidable manual PN 290 0.0569 -1.27 0.4
--.GIB.Z. 1985-04-21T18:14:53.00 10.0 negative manual PN 199 0.0555 0.89 1.4
--.SGO.Z. 1985-04-21T18:14:53.50 10.0 undecidable manual SN 197 0.0308 0.24 0.6
--.ROB.Z. 1985-04-21T18:14:52.00 10.0 undecidable manual PN 278 0.0561 -1.05 0.6
--.CK1.Z. 1985-04-21T18:14:49.50 10.0 undecidable manual PN 279 0.0536 0.38 1.1
--.VAI.Z. 1985-04-21T18:14:47.20 10.0 undecidable manual PN 294 0.0527 -0.64 1.8
--.CVF.Z. 1985-04-21T18:14:47.60 10.0 undecidable manual PN 260 0.0516 1.45 0.4
--.PE1.Z. 1985-04-21T18:14:45.00 10.0 undecidable manual SN 169 0.0281 -1.02 0.5
--.BRT.Z. 1985-04-21T18:14:44.00 10.0 undecidable manual SN 172 0.0271 0.44 0.5
--.VAY.Z. 1985-04-21T18:14:38.00 10.0 undecidable manual PN 119 0.0459 0.55 1.1
--.BG1.Z. 1985-04-21T18:14:37.50 10.0 undecidable manual PN 295 0.0469 -1.41 0.4
--.TRI.Z. 1985-04-21T18:14:35.50 10.0 undecidable manual SN 315 0.0243 -0.62 0.5
--.SAL.Z. 1985-04-21T18:14:31.00 10.0 undecidable manual PN 295 0.0415 0.23 1.3
--.PAG.Z. 1985-04-21T18:14:28.90 10.0 undecidable manual PN 303 0.0406 -0.38 1.2
--.PS9.Z. 1985-04-21T18:14:28.00 10.0 undecidable manual PN 271 0.0391 0.95 0.8
--.DDS.Z. 1985-04-21T18:14:26.00 10.0 undecidable manual PN 301 0.0387 -0.4 1.3
--.ROI.Z. 1985-04-21T18:14:26.00 10.0 undecidable manual PN 181 0.0385 -0.23 1.3
--.CAV.Z. 1985-04-21T18:14:26.40 10.0 undecidable manual PN 307 0.0390 -0.49 1.2
--.MA1.Z. 1985-04-21T18:14:25.50 10.0 undecidable manual PN 252 0.0376 0.61 1.1
--.OHR.Z. 1985-04-21T18:14:25.20 10.0 undecidable manual PN 131 0.0375 0.64 1.1
--.SKO.Z. 1985-04-21T18:14:24.00 10.0 undecidable manual PN 117 0.0363 1.08 0.7
--.CTI.Z. 1985-04-21T18:14:23.30 10.0 undecidable manual PN 305 0.0368 -0.31 1.3
--.CSI.Z. 1985-04-21T18:14:22.40 10.0 undecidable manual PN 183 0.0367 -0.97 0.8
--.FO1.Z. 1985-04-21T18:14:20.50 10.0 undecidable manual PN 318 0.0342 0.84 1
--.FIR.Z. 1985-04-21T18:14:19.00 10.0 undecidable manual PN 271 0.0343 -0.77 1
--.ORI.Z. 1985-04-21T18:14:19.00 10.0 negative manual PN 182 0.0342 -0.66 2.3
--.PHP.Z. 1985-04-21T18:14:18.00 10.0 undecidable manual PN 127 0.0322 1.39 0.5
--.RCL.Z. 1985-04-21T18:14:16.40 10.0 undecidable manual PN 312 0.0322 -0.21 1.4
--.LCI.Z. 1985-04-21T18:14:16.00 10.0 undecidable manual PN 162 0.0334 -2.3 0.1
--.SOR.Z. 1985-04-21T18:14:16.40 10.0 undecidable manual PN 208 0.0329 -1.28 0.6
--.OVO.Z. 1985-04-21T18:14:15.70 10.0 undecidable manual PN 209 0.0308 1.32 0.6
--.KKS.Z. 1985-04-21T18:14:15.30 10.0 undecidable manual PN 122 0.0300 2.06 0.1
--.TIR.Z. 1985-04-21T18:14:15.30 10.0 undecidable manual PN 135 0.0315 -0.13 1.4
--.CH1.Z. 1985-04-21T18:14:14.50 10.0 undecidable manual PN 268 0.0300 1.42 0.5
--.BOO.Z. 1985-04-21T18:14:14.20 10.0 undecidable manual PN 317 0.0311 -0.66 1.1
--.SGO.Z. 1985-04-21T18:14:13.00 10.0 undecidable manual PN 197 0.0308 -1.4 0.5
--.BUA.Z. 1985-04-21T18:14:13.30 10.0 undecidable manual PN 316 0.0304 -0.45 1.3
--.RBL.Z. 1985-04-21T18:14:13.50 10.0 undecidable manual PN 323 0.0300 0.45 1.3
--.PRG.E. 1985-04-21T18:14:12.00 10.0 undecidable manual PN 258 0.0279 2.02 0.2
--.BAD.Z. 1985-04-21T18:14:12.60 10.0 undecidable manual PN 318 0.0300 -0.49 1.3
--.BS1.Z. 1985-04-21T18:14:12.50 10.0 undecidable manual PN 204 0.0300 -0.7 1.1
--.MNS.Z. 1985-04-21T18:14:11.50 10.0 undecidable manual PN 244 0.0286 0.42 1.3
--.COL.Z. 1985-04-21T18:14:11.00 10.0 undecidable manual PN 317 0.0287 -0.19 1.4
--.PUK.Z. 1985-04-21T18:14:10.50 10.0 undecidable manual PN 126 0.0274 1.3 0.6
--.PE1.Z. 1985-04-21T18:14:09.50 10.0 positive manual PN 169 0.0281 -0.73 2.2
--.DRE.Z. 1985-04-21T18:14:09.70 10.0 undecidable manual PN 320 0.0278 -0.12 1.4
--.PO9.Z. 1985-04-21T18:14:09.00 10.0 undecidable manual PN 246 0.0263 1.48 0.4
--.AS1.Z. 1985-04-21T18:14:08.00 10.0 undecidable manual PN? 256 0.0264 0.32 0.6
--.SDA.Z. 1985-04-21T18:14:07.30 10.0 undecidable manual PN 130 0.0255 0.96 0.9
--.BRT.Z. 1985-04-21T18:14:07.50 10.0 undecidable manual PN 172 0.0271 -1.3 0.6
--.SD1.Z. 1985-04-21T18:14:07.10 10.0 negative manual PN 225 0.0265 -0.67 2.3
--.TR9.Z. 1985-04-21T18:14:07.90 10.0 undecidable manual PN 200 0.0267 -0.34 1.4
--.SGG.Z. 1985-04-21T18:14:07.30 10.0 undecidable manual PN 214 0.0265 -0.48 1.3
--.AQU.Z. 1985-04-21T18:14:05.50 10.0 undecidable manual PN 239 0.0247 0.44 1.3
--.TRI.Z. 1985-04-21T18:14:04.50 10.0 undecidable manual PN 315 0.0243 -0.01 1.5
--.DUI.Z. 1985-04-21T18:14:04.20 10.0 undecidable manual PN 216 0.0241 0 1.5
--.LJU.Z. 1985-04-21T18:14:03.00 10.0 undecidable manual PN 328 0.0235 -0.2 1.4
--.BAI.Z. 1985-04-21T18:14:03.50 10.0 undecidable manual PN 176 0.0249 -1.8 0.2
--.AR1.Z. 1985-04-21T18:14:03.50 10.0 positive manual PN 264 0.0236 0.01 2.9
--.CM2.Z. 1985-04-21T18:14:02.20 10.0 undecidable manual PN 257 0.0230 -0.27 2.8
--.CEY.Z. 1985-04-21T18:14:01.20 10.0 undecidable manual PN 323 0.0216 0.8 1
--.TTG.Z. 1985-04-21T18:14:01.50 10.0 undecidable manual PN 126 0.0219 0.63 1.2
--.ALP.Z. 1985-04-21T18:14:00.90 10.0 undecidable manual PN 245 0.0218 0.28 2.8
--.BDV.Z. 1985-04-21T18:13:59.00 10.0 undecidable manual PN 133 0.0206 0.16 1.4
--.MS1.Z. 1985-04-21T18:13:56.00 10.0 undecidable manual PN 193 0.0198 -1.58 0.4
--.HCY.Z. 1985-04-21T18:13:54.70 10.0 undecidable manual PN 135 0.0180 -0.18 2.9
--.SAR.Z. 1985-04-21T18:13:44.50 10.0 negative manual PN 90 0.0121 -1.47 0.9
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, http://terremoti.ingv.it/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