Earthquake with magnitude of mb 4.5 on date 20-09-2020 and time 12:59:03 (Italy) in region Croatia [Land]

A magnitude mb 4.5 earthquake occured in region: Croatia [Land], on

  • 20-09-2020 10:59:03 (UTC)
  • 20-09-2020 12:59:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2170, 15.9390 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Reviewed
Rev100
mb 4.5
Mwp 4.0
2020-09-20
10:59:03
44.2169 15.9387 10 2020-09-20
11:43:46
Sala Sismica INGV-Roma 83061171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-20 10:59:03
Latitude 44.2169
Longitude 15.9387
Depth (km) 10 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 83061171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1369
Semi-minor axis of confidence ellipse (meter) 156
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 226
Circular confidence region, given by single value of horizontal uncertainty (meter) 1111.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 56.4817
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.854325
Epicentral distance of station closest to the epicenter (degree) 1.03538
Epicentral distance of station farthest from the epicenter (degree) 8.95371
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 32
Magnitudes information

Mwp:4.0

Field Value
Value 4.0
Uncertainty 0.0
Num. used stations 3
Type of magnitude Mwp
Reference to an origin 83061171
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2020-09-20 11:43:46

mb:4.5

Field Value
Value 4.5
Uncertainty 0.3
Num. used stations 17
Type of magnitude mb
Reference to an origin 83061171
Agency INGV
Autore early-est_ee1.1.9
Time of creation (UTC) 2020-09-20 11:43:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
RD.LOR.BHZ. 2020-09-20T11:01:12.12 10.0 negative automatic P 294 8.9537 -0.743758 0.952381
HL.ITM.HHZ. 2020-09-20T11:01:04.76 10.0 positive automatic P 145 8.3689 -0.0691765 0.970874
G.SSB.BHZ.00 2020-09-20T11:01:00.30 10.0 positive automatic P 281 8.1561 -1.65135 0.833333
G.ECH.BHZ.00 2020-09-20T11:00:49.20 10.0 negative automatic P 306 7.2660 -0.516192 0.97561
HT.AGG.HHZ. 2020-09-20T11:00:46.88 10.0 negative automatic P 135 7.0569 0.0250415 0.97561
MN.VSL.BHZ. 2020-09-20T11:00:43.87 10.0 positive automatic P 228 6.7900 0.721823 0.97561
II.BFO.BHZ.00 2020-09-20T11:00:41.07 10.0 positive automatic P 311 6.6712 -0.486561 0.888889
MN.BNI.BHZ. 2020-09-20T11:00:40.25 10.0 positive automatic P 280 6.6386 -1.00061 0.97561
GE.STU.BHZ. 2020-09-20T11:00:39.10 10.0 negative automatic P 317 6.4989 -0.0530179 0.97561
MN.CEL.BHZ. 2020-09-20T11:00:30.67 10.0 positive automatic P 180 5.9564 -1.0856 0.952381
GE.MORC.BHZ. 2020-09-20T11:00:28.15 10.0 positive automatic P 11 5.6657 0.381377 0.930233
RD.PGF.BHZ. 2020-09-20T11:00:23.70 10.0 positive automatic P 254 5.3100 0.747455 0.970874
OE.DAVA.BHZ. 2020-09-20T11:00:22.87 10.0 negative automatic P 308 5.2216 1.05384 0.909091
CZ.KHC.BHZ. 2020-09-20T11:00:21.80 10.0 negative automatic P 343 5.1731 0.80695 0.97561
HL.KEK.HHZ. 2020-09-20T11:00:21.60 10.0 negative automatic P 146 5.3382 -1.58311 0.913242
MN.TUE.BHZ. 2020-09-20T11:00:21.92 10.0 positive automatic P 298 5.1500 1.03165 0.963855
MN.TIP.BHZ. 2020-09-20T11:00:19.77 10.0 negative automatic P 173 5.0742 0.118646 0.952381
IV.BOB.BHZ. 2020-09-20T11:00:14.80 10.0 positive automatic P 279 4.6614 0.796233 0.952381
GE.PSZ.BHZ. 2020-09-20T11:00:12.15 10.0 negative automatic P 35 4.6064 -1.10485 0.97561
MN.BZS.BHZ. 2020-09-20T11:00:08.97 10.0 positive automatic P 69 4.2724 0.433026 0.952381
MN.CUC.BHZ. 2020-09-20T11:00:07.67 10.0 positive automatic P 181 4.2239 -0.267665 0.97561
IV.SALO.BHZ. 2020-09-20T11:00:05.95 10.0 positive automatic P 292 4.0810 -0.0175223 0.97561
MN.VLC.BHZ. 2020-09-20T11:00:04.87 10.0 positive automatic P 271 3.9808 0.288892 0.909091
GE.MATE.BHZ. 2020-09-20T10:59:58.70 10.0 positive automatic P 171 3.6121 -0.805517 0.952381
OE.KBA.BHZ. 2020-09-20T10:59:57.67 10.0 positive automatic P 329 3.3871 1.05112 0.97561
IV.MGAB.BHZ. 2020-09-20T10:59:52.65 10.0 positive automatic P 246 3.0636 0.679923 0.909091
MN.PDG.BHZ. 2020-09-20T10:59:52.67 10.0 positive automatic P 125 3.0053 1.59117 0.930233
OE.ARSA.BHZ. 2020-09-20T10:59:51.97 10.0 negative automatic P 355 3.0473 0.222809 0.952381
IV.PTCC.BHZ. 2020-09-20T10:59:49.65 10.0 positive automatic P 321 2.8461 0.643964 0.47619
MN.AQU.BHZ. 2020-09-20T10:59:46.12 10.0 positive automatic P 226 2.6211 0.208719 0.888889
HU.KOVH.BHZ. 2020-09-20T10:59:42.20 10.0 negative automatic P 38 2.4132 -0.781446 0.930233
MN.BLY.BHZ. 2020-09-20T10:59:22.87 10.0 negative automatic P 59 1.0354 -0.489649 0.97561
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