Earthquake with magnitude of ML 3.9 on date 31-12-2020 and time 09:15:46 (Italy) in region Croatia [Land]

A magnitude ML 3.9 earthquake occured in region: Croatia [Land], on

  • 31-12-2020 08:15:46 (UTC)
  • 31-12-2020 09:15:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 45.4510, 16.1330 at 13 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

These three maps show the results of the analysis using the software ShakeMap designed to provide the level of ground shaking experienced in a region using the data recorded by seismometers and strong motion instruments and seismological information regarding the attenuation of the wavefield with distance and the site characteristics. The Shakemaps are determined for research purposes to provide fast estimates of the level of ground shaking produced by the earthquake. The maps are calculated automatically and updated as more data become available. See http://shakemap.ingv.it for additional information. The black star indicates the epicenter. The triangles show the accelerometric and velocimetric stations used in the calculation, colored according to the recorded shaking.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of instrumental intensities. The intensity is derived through an empirical law that correlates the recorded values of actual ground shaking, e.g., acceleration and velocity, with the macroseismic intensity for Italian earthquakes, as reported in the Italian Macroseismic Database (DBMI15, https://doi.org/10.13127/cpti/cpti15.3).
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows the distribution of peak ground acceleration expressed as percent of the acceleration of gravity (i.e., g = 9.81 m/s²).
Peak velocity Shakemap

Peak velocity Shakemap

This map shows the distribution of peak ground velocities expressed in cm/s.
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 3.9 2020-12-31
08:15:46
45.4507 16.133 13 2021-01-12
17:12:26
Bollettino Sismico Italiano INGV 86012461
Reviewed
Rev100
mb 4.1 2020-12-31
08:15:46
45.4975 16.2817 10 2020-12-31
08:31:09
Sala Sismica INGV-Roma 85899971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-31 08:15:46 ± 0.17
Latitude 45.4507 ± 0.0081
Longitude 16.1330 ± 0.0103
Depth (km) 13 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86012461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 953
Semi-minor axis of confidence ellipse (meter) 427
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 148
Circular confidence region, given by single value of horizontal uncertainty (meter) 950.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 270
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 39
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.38941
Epicentral distance of station farthest from the epicenter (degree) 3.59189
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 29
Magnitudes information

ML:3.9

Field Value
Value 3.9
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 86012461
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-12 17:11:02

mb:4.1

Field Value
Value 4.1
Uncertainty 0.3
Num. used stations 8
Type of magnitude mb
Reference to an origin 85899971
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2020-12-31 08:31:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
OX.CLUD.HHZ. 2020-12-31T08:16:56.61 1.0 undecidable manual S 295 2.4731 54 -0.1 0
OX.PRED.HHE. 2020-12-31T08:16:47.32 1.0 undecidable manual S 300 2.0415 54 0.94 0
OE.WTTA.HHZ. 2020-12-31T08:16:43.35 0.3 undecidable manual P 302 3.5919 54 0.94 0
OX.DRE.HHZ. 2020-12-31T08:16:42.97 1.0 undecidable manual S 294 1.8778 54 0.51 2
OE.ARSA.BHE. 2020-12-31T08:16:42.05 1.0 undecidable manual S 347 1.8472 54 0.31 3
NI.DST2.HHE. 2020-12-31T08:16:37.14 1.0 undecidable manual S 278 1.6449 54 0.24 9
MN.TRI.HHZ. 2020-12-31T08:16:37.81 0.6 undecidable manual S 280 1.6772 54 0.14 16
IT.DANT.HNE. 2020-12-31T08:16:31.66 1.0 undecidable manual P 295 2.7447 54 0.94 0
IV.FRE8.HNE. 2020-12-31T08:16:30.71 0.6 undecidable manual P 283 2.6944 54 0.69 0
OX.CIMO.HHZ. 2020-12-31T08:16:30.10 0.1 undecidable manual P 290 2.7061 54 -0.08 0
OX.CAE.HHE. 2020-12-31T08:16:29.36 0.6 undecidable manual P 284 2.6368 54 0.13 0
OX.MLN.HHE. 2020-12-31T08:16:28.16 0.1 positive manual P 287 2.5478 54 0.16 0
IV.FVI.HHZ. 2020-12-31T08:16:28.53 0.6 undecidable manual P 297 2.5927 54 -0.09 0
NI.PURA.HHE. 2020-12-31T08:16:28.37 0.1 positive manual P 294 2.5505 54 0.34 0
IV.STAL.HHZ. 2020-12-31T08:16:27.55 0.3 undecidable manual P 290 2.5154 54 0 0
OX.CLUD.HHZ. 2020-12-31T08:16:27.06 0.6 undecidable manual P 295 2.4731 54 0.1 0
NI.PALA.HHZ. 2020-12-31T08:16:26.06 0.3 positive manual P 291 2.3706 54 0.51 0
SL.LJU.BHZ. 2020-12-31T08:16:26.64 0.6 undecidable manual S 298 1.2662 91 0.33 45
OX.MPRI.HHZ. 2020-12-31T08:16:25.60 0.1 positive manual P 291 2.3274 54 0.65 0
OX.FUSE.HHZ. 2020-12-31T08:16:25.58 0.1 negative manual P 295 2.3805 54 -0.1 0
OX.BOO.HHE. 2020-12-31T08:16:24.80 0.1 positive manual P 293 2.2825 54 0.47 0
RF.GEPF.HHZ. 2020-12-31T08:16:24.11 0.3 undecidable manual P 293 2.2411 54 0.36 0
OX.BAD.HHE. 2020-12-31T08:16:22.63 0.1 undecidable manual P 292 2.1584 54 0.02 0
IV.PTCC.HHZ. 2020-12-31T08:16:21.93 0.6 undecidable manual P 297 2.1557 54 -0.64 0
NI.VINO.HHZ. 2020-12-31T08:16:21.88 0.3 undecidable manual P 293 2.1449 54 -0.55 0
OX.ACOM.HHZ. 2020-12-31T08:16:21.97 0.1 positive manual P 302 2.1233 54 -0.16 0
OX.PRED.HHE. 2020-12-31T08:16:20.45 0.1 undecidable manual P 300 2.0415 54 -0.55 0
OX.SABO.HHZ. 2020-12-31T08:16:18.05 0.1 positive manual P 288 1.8247 54 0.05 14
OX.DRE.HHZ. 2020-12-31T08:16:18.11 0.1 positive manual P 294 1.8778 54 -0.62 8
SL.KOGS.BHZ. 2020-12-31T08:16:18.91 0.6 undecidable manual S 5 1.0000 91 0.5 51
OE.ARSA.BHE. 2020-12-31T08:16:17.57 0.3 undecidable manual P 347 1.8472 54 -0.75 7
NI.DST2.HHE. 2020-12-31T08:16:15.74 0.1 positive manual P 278 1.6449 54 0.22 38
MN.TRI.HHZ. 2020-12-31T08:16:15.15 0.1 positive manual P 280 1.6772 54 -0.81 29
SL.LJU.BHZ. 2020-12-31T08:16:09.97 0.1 positive manual P 298 1.2662 91 0.57 85
SL.BOJS.BHE. 2020-12-31T08:16:06.57 1.0 undecidable manual S 275 0.6196 92 -0.57 22
SL.KOGS.BHZ. 2020-12-31T08:16:04.97 0.1 negative manual P 5 1.0000 91 0.12 100
CR.ZAG.BHE. 2020-12-31T08:16:00.22 0.3 undecidable manual S 345 0.3894 93 -0.11 69
SL.BOJS.BHE. 2020-12-31T08:15:58.21 0.3 positive manual P 275 0.6196 92 -0.13 75
CR.ZAG.BHE. 2020-12-31T08:15:54.24 0.1 negative manual P 345 0.3894 93 -0.17 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
SL.KOGS.BHN. ML:5.2 0.124 0.3 AML other m 2020-12-31T08:16:21.79
SL.KOGS.BHE. ML:5.1 0.1151 0.5 AML other m 2020-12-31T08:16:21.39
SL.LJU.BHE. ML:4.7 0.031895335000000004 0.3008 AML other m 2020-12-31T08:16:30.21
SL.LJU.BHN. ML:4.8 0.038198035 1.3024 AML other m 2020-12-31T08:16:30.81
MN.TRI.HHE. ML:3.7 0.001828288 0.4032 AML other m 2020-12-31T08:16:43.64
MN.TRI.HHN. ML:3.7 0.0017000000000000001 0.34 AML other m 2020-12-31T08:16:43.72
OX.SABO.HNN. ML:0.0 0.01066 0.42 AML other m 2020-12-31T08:16:47.25
OX.SABO.HHE. ML:0.0 0.002715 0.6 AML other m 2020-12-31T08:16:49.06
OX.SABO.HNE. ML:0.0 0.01135 0.6 AML other m 2020-12-31T08:16:49.07
OX.SABO.HHN. ML:0.0 0.002925 0.32 AML other m 2020-12-31T08:16:52.28
IV.PTCC.HHE. ML:3.6 0.0009215 0.62 AML other m 2020-12-31T08:16:58.14
OX.ACOM.HHN. ML:4.1 0.0029050000000000005 0.44 AML other m 2020-12-31T08:16:59.94
OX.ACOM.HNN. ML:4.1 0.002975 0.44 AML other m 2020-12-31T08:16:59.94
IV.PTCC.HHN. ML:3.7 0.0011200000000000001 0.46 AML other m 2020-12-31T08:17:01.80
NI.VINO.HHN. ML:3.8 0.0014360504999999999 0.4608 AML other m 2020-12-31T08:17:01.85
RF.GEPF.HHN. ML:3.8 0.0011805000000000001 0.56 AML other m 2020-12-31T08:17:03.24
OX.MPRI.HNE. ML:3.8 0.001185 0.52 AML other m 2020-12-31T08:17:03.47
OX.MPRI.HHE. ML:3.9 0.0015350000000000001 0.52 AML other m 2020-12-31T08:17:03.47
OX.ACOM.HHE. ML:4.0 0.002275 0.52 AML other m 2020-12-31T08:17:04.69
OX.ACOM.HNE. ML:4.0 0.00234 0.52 AML other m 2020-12-31T08:17:04.69
NI.VINO.HHE. ML:3.8 0.001245 0.62 AML other m 2020-12-31T08:17:05.12
RF.GEPF.HHE. ML:3.7 0.0009065000000000001 0.36 AML other m 2020-12-31T08:17:06.86
OX.MPRI.HHN. ML:4.0 0.001965 0.7 AML other m 2020-12-31T08:17:07.59
OX.MPRI.HNN. ML:3.9 0.0015249999999999999 0.42 AML other m 2020-12-31T08:17:09.23
IV.STAL.HNN. ML:4.1 0.001960261 0.4608 AML other m 2020-12-31T08:17:13.21
IV.STAL.HNE. ML:4.1 0.002 0.34 AML other m 2020-12-31T08:17:13.01
IV.STAL.HHE. ML:4.2 0.002235 0.34 AML other m 2020-12-31T08:17:13.01
NI.PALA.HHE. ML:4.2 0.002445 0.58 AML other m 2020-12-31T08:17:13.48
NI.PALA.HHN. ML:4.2 0.00299 0.56 AML other m 2020-12-31T08:17:13.18
IV.STAL.HHN. ML:4.0 0.001480049 0.2816 AML other m 2020-12-31T08:17:14.18
OX.CLUD.HHE. ML:3.8 0.0010375630499999998 0.9408 AML other m 2020-12-31T08:17:14.60
OX.CLUD.HNE. ML:3.8 0.00101 1.08 AML other m 2020-12-31T08:17:14.60
OX.CLUD.HNN. ML:3.7 0.000833 1.3 AML other m 2020-12-31T08:17:15.15
OX.CLUD.HHN. ML:3.7 0.000804 1.32 AML other m 2020-12-31T08:17:15.15
OX.CIMO.HNN. ML:3.6 0.0004925000000000001 0.7 AML other m 2020-12-31T08:17:18.89
OX.CIMO.HHN. ML:3.6 0.0004965000000000001 0.68 AML other m 2020-12-31T08:17:18.88
IV.FVI.HHN. ML:3.6 0.0006045 0.76 AML other m 2020-12-31T08:17:22.01
IV.FVI.HHE. ML:3.6 0.00059954475 0.5184 AML other m 2020-12-31T08:17:24.55
OX.CIMO.HHE. ML:3.5 0.00038950000000000003 0.56 AML other m 2020-12-31T08:17:28.46
OX.CIMO.HNE. ML:3.5 0.000386 0.56 AML other m 2020-12-31T08:17:28.47
OE.WTTA.HHE. ML:3.6 0.00022 0.48 AML other m 2020-12-31T08:17:45.53
OE.WTTA.HHN. ML:3.6 0.000261 1.48 AML other m 2020-12-31T08:17:49.19
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
Waveforms Seismic signals in miniseed + resp format Download