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Seismicity of Croatia in the period 2006 – 2015

During the ten-year period from 2006 to 2015 a total of 36 733 earthquakes were located in Croatia and its surrounding areas, with 37 main events registering magnitudes from 4.0 to 4.9. Seismically the most active was the coastal part of Croatia confined to two seismically distinguished areas. The NW domain was seismically less active, with almost 10 000 located events (seven were of magnitude ML ≥ 4.0), among which were the three strongest events that occurred in Croatia during the observed period. Two of them occurred in the Senj epicentral area, the first one on 5 February 2007 at 8:30 UTC (ML = 4.9, Imax = VII °MSK) and the second one on 30 July 2013 at 12:58 UTC, (ML = 4.8, Imax = VI °MSK). The third event occurred near Kornati Islands on 18 July 2007 at 10:54 UTC (ML = 4.8). The SE domain experienced the highest number of earthquakes (over 19 000 located events, with 24 events of magnitude ML ≥ 4.0, among which the strongest one was of magnitude ML = 4.9 with the epicentre in Bosnia and Herzegovina near the Croatian border). The seismicity in the continental part of Croatia was weak-to-moderate, with earthquakes of magnitudes ML ≤ 4.1. Focal mechanisms were obtained for 31 earthquakes with magnitudes ML ≥ 4.0, and individual earthquakes have also been macroseismically analysed. Low current moment release rates for both regions (continental and coastal) as compared to long-term averages, indicate the regions are currently in the strain accumulation phase.


Introduction
The present paper summarises seismic activity on the territory of Croatia and the surrounding regions in the period 2006-2015. It is a follow-up on a series of publications (Markušić et al., 1990(Markušić et al., , 1993(Markušić et al., , 1998Ivančić et al., 2002Ivančić et al., , 2006 presenting overviews of Croatian seismicity from 1988 until 2005. The first compilation of the Croatian Earthquake Catalogue (CEC) was initiated as a part of  (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015). The red dotted line shows the wider area around Croatia considered in this paper. (b) Faultplane solutions for 31 earthquakes obtained in this study are shown (lower hemisphere projection, see text for more detail). The identification numbers refer to Tab. 2. Compressive quadrants are shaded. The most important sections of seismogenic faults are shown after Ivančić et al. (2006) In order to determine the earthquake parameters, data from the Croatian Seismological Network were supplemented by readings reported in monthly bul- letins of seismological stations in the neighbouring countries. The earthquake hypocentral coordinates and origin times were calculated by the latest version of the HYPOSEARCH program based on a grid-search algorithm (Herak, 1989) using both P-and S-wave arrival times, and the crustal model from B.C.I.S. (1972) that was modified by adding a thin layer on top. In addition to the information on where and when an earthquake took place (epicentre coordinates and epicentral time), its focal depth, magnitudes and epicentral intensity, the catalogue contains the data on the location reliability, number of data used and references for each entry.
Fault-plane solutions presented in this paper ( Fig. 1(b)) were evaluated using data on the first motion polarity which were read from the original seismograms   from Croatian stations as well as from the seismograms available from the OR-FEUS European Integrated Data Archive (EIDA, 2017). For some events amplitude ratios were also considered (for the method used see Herak et al., 2016).
The obtained solutions are discussed in the following sections. Macroseismic data were collected for all events felt in Croatia. The first information about effects of the earthquake were obtained from Civil Defence and web questionnaires which can be found on the web pages of the Department of Geophysics. The preliminary intensities were assessed by using this information. If the preliminary estimate of the epicentral intensity was five or more macroseismic data were obtained also by fieldwork. Macroseismic data for smaller events were collected only by questionnaires and phone interviews. Isoseismal and intensity maps for 10 earthquakes are presented in this paper. Intensities were estimated according to the MSK-78 scale (Medvedev et al., 1964;Medvedev, 1978; abbreviated here as MSK) with modifications by the Ad-hoc Panel (1981).
A total of 36733 earthquakes (for which at least six onset time-readings were available) were located in Croatia and the surrounding areas in the period 2006-2015 ( Fig. 1(a)). The frequency-magnitude distributions for the declustered catalogue (mainshocks were extracted by space-time windowing as suggested by Herak et al., 2009) are presented in Fig. 2. The magnitude completeness threshold M c for the analysed data was estimated at the lowest magnitude bin still obeying the log-linear distribution as M c = 1.9, and the coefficient b of the Gutenberg-Richter relation is found to have a value of 0.95.
The magnitude completeness of the CEC was significantly improved during the period 2006-2015 due to considerable increase in the number of digital seismological stations. During the previous period 2002-2005 the Croatian Seismological Network consisted of only ten digital stations, and Ivančić et al. (2006) estimated the magnitude completeness threshold to be M c = 2.8. The mainshocks listed in CEC since 1970 are displayed on Fig 3a. The timeline of magnitude distribution of these events and the corresponding estimated completeness thresholds M c computed as suggested by Herak et al. (2009), are presented in Fig. 3b.

Instrumentation
Collection of earthquake related microseismic data was assembled by analysing seismograms recorded from permanent and temporary seismological stations in Croatia. During the observed period the Croatian Seismological Network consisted of the permanent Croatian State Seismological Network run by the Croatian Seismological Survey, its Zagreb-Net subnetwork (operating instruments owned by the City of Zagreb), and the stations installed within two Croatian research projects -Seismicity of Croatia (2006Croatia ( -2013, funded by the Ministry of Science, Education and Sports, and project VELEBIT (2015-2019) funded by the Croatian Science Foundation. All stations broadcast data to the central facility in Zagreb in real time. More information on all the stations is given in Tab. 3, while  their locations, as well as the sub-networks they operated within, are shown in Fig. 4. The Croatian network relies mostly on BB Güralp instruments, with the exception of two Lennartz and two STS-2 seismographs. Also, a moving coil pickup has been installed in 2009 on the horizontal Wiechert (1000 kg) instrument from 1909 in Zagreb, whose output is digitized and routinely recorded along with the modern broad-band instrument. Live Wiechert seismograms are available on: http://www.gfz.hr/Wiechert_seizmogrami/Wiechert_seizmogrami.htm.

Features of Croatian seismicity in the period 2006-2015
The analysis of Croatian seismicity is usually divided to two major areas (Markušić et al., 1990(Markušić et al., , 1993(Markušić et al., , 1998Ivančić et al., 2002Ivančić et al., , 2006: (1) the continental part of Croatia, i.e. the southwestern part of the Pannonian Basin, northwestern and central Croatia, and (2) the coastal part of Croatia -Adriatic Sea, its NE coast and the External Dinarides.

Continental part of Croatia
The continental part of Croatia (Fig. 5) occupies the territory of the parts of northwestern Dinarides, the southwestern part of the Pannononian Basin and its western margins towards the Alpine domain. The interaction between the Adriatic microplate, the Dinarides, the Alps and the Pannonian basin led to rather complex tectonic and structural relationships. Well pronounced NW trend of both External and Internal Dinarides in the central part of this area (the main structural trends in the Vukomeričke Gorice, the Kupa and the Sava valleys are parallel to the major structural trend of the Dinarides) changes into NE-SW or even E-W oriented trend of inselbergs north of Zagreb (the largest of which are Medvednica, Kalnik and Ivanščica Mts.; e.g. Šikić et al., 1977;Prelogović et al., 2003;Tomljenović et al., 2008;Ustaszewski et al., 2008Ustaszewski et al., , 2010. Although the seismicity of these parts of Croatia is mostly of intraplate nature, and is thus characterised by rather rare occurrence of strong earthquakes, historical seismicity shows that its seismic potential is considerable. Figure 6 presents cumulative seismic moment release since the middle 17th century in the area shown in Fig. 5, excluding the events in the Dinarides, i.e. south of the latitude of 45° N. Scalar seismic moments were computed assuming equivalence of M L and M w , and using the moment magnitude definition by Hanks and Kanamori (1979). For historical events for which no microseismic data exist, the epicentral intensity was first converted to local magnitude M L using the empirical relation (Herak, 1995): where I 0 is epicentral intensity (°MSK), and h is the focal depth (assumed as 12 km if unknown, see Herak and Herak, 1990). The current long-term average moment release rate is about 3.5 × 10 16 Nm/year, which is equivalent of one M w = 5.0 event per year, or one M w = 6.4 earthquake per century. Figure 6 also shows that the current moment release rate ever since the Brežice and Bilogora events of 1917 and 1938, respectively, is considerably lower than the long-term average. This indicates that the region is under the stress accumulation phase for the last 100 years.
The northwestern part of Croatia was seismically the most active area in the continental part of Croatia, with epicentres spreading from Bilogora Mt. and Koprivnica in the NW along the mountains Kalnik, Ivanščica, Medvednica, to Žumberak in the west, and from Pokuplje to Zrinska Gora in its southern parts.  Hanks and Kanamori (1979). Straight dashed lines' slope shows the average moment release rate since mid 17th century. Moment released in some important events is indicated by arrows.
Moslavina and Slavonia were characterised by mostly diffuse, weak to moderate seismicity ( Figs. 1 and 5).
Seismic activity in the westernmost regions of this area (Hrvatsko Zagorje -the border region between Croatia and Slovenia and Medvednica Mt.) was relatively weak. Mostly isolated events occurred here, with the exception of the sequence of 43 weak earthquakes near Bistra in the period 21-31 August 2013. The earthquake with the largest magnitude (M L = 2.8) occurred on 25 August 2013 at 22:39 with the maximum reported intensity of V °MSK in Bistra. Until the end of the year 18 more weak earthquakes were recorded in this epicentral area.
Epicentral area stretching from Brežice in Slovenia to Žumberak in Croatia was most active by the end of 2015. The strongest event here occurred on 1 November 2015 near Cerklje in Slovenia, about five kilometres from Croatian border, with magnitude M L = 4.2. On the Croatian side of the border it was felt with the intensity of V °MSK in Grdanjci, Stojdraga, Budinjak, Gornja Vas and Gorica Svetojanska where strong shaking was felt, plates and bottles were shaking and pounding and many observers ran outdoors. In Budinjak, 1 mm wide cracks occurred in the plaster on the outside wall of a wooden house, and in Gornja Vas  (CE3RN, 2016). The fault-plane solution (No. 31 in Fig. 1(b) and Tab. 2) indicates a predominantly reverse causative fault either steeply dipping to the N, or more gently to the SSW.
A strong event occurred near Japetić, between Samobor and Jastrebarsko, on 28 October 2006 at 13:55 UTC (all origin times in the paper given as UTC) with magnitude M L = 4.1. The macroseismic field survey revealed that it was strongly felt in Plešivica, Prhoč and Repišče with the maximum intensity of VI-VII °MSK. This earthquake threw down some heavy (~50 kg) concrete chimney caps, and some tiles slipped from the roofs in Plešivica and Prhoč. The walls on the old church in Plešivica cracked. On several houses in Repišče chimneys were slightly twisted. The distribution of the intensities assembled from the Croatian side is displayed in Fig. 7. The microseismic epicentre is located within the meizoseismal. The fault that generated this event (No. 2 in Fig. 1(b) and Tab. 2) was a strike-slip one -either a dextral one striking NW-SE, or the sinistral one striking NE-SW. This earthquake was preceded by several events of which the strongest ones occurred on 23 January 2006 with magnitude M L = 3.9 and on 19 July 2006 with magnitude M L = 3.6. (Figs. 1 and 5).
The seismicity in the Pokuplje and Zrinska Gora mountain epicentral area was characterized by notable occurrence of small events. Moderately frequent but weak earthquakes occurred in the vicinity of Sisak and along the Kupa river valley. The strongest earthquake in Zrinska Gora area occurred in the Una river valley on 2 October 2014 at 04:43, between Kuljani, Divuša and Unčani (M L = 4.0, I max = V-VI °MSK) on the Croatia -Bosnia and Herzegovina border. The distribution of the intensities assembled from the Croatian side is displayed in Fig. 8. Observers in the epicentral area stressed that they felt strong shaking, and many of them ran outdoors. The microseismic epicentre is located near Divuša, within the meizoseismal. The maximum intensity of V-VI °MSK was estimated in several villages between Divuša and Unčina. One vertical crack on a partition wall above a door and several cracks in plaster walls were observed in Divuša in the meizoseismal area. FPS (No. 29 in Fig. 1(b) and Tab. 2) points to a reverse faulting, either along a very steeply dipping fault striking WSW-ENE, or along an almost horizontal fault striking E-W.
Adjacent to the area of Zrinska Gora extends the Banja Luka epicentral area in Bosnia and Herzegovina well known by occasional intense seismic activity (e.g. the devastating Banja Luka earthquakes of 1969; Ustaszewski et al., 2014). During the observed period two earthquakes occurred beneath the Kozara Mt. in the vicinity of Banja Luka, both of magnitudes M L = 4.1 (7 May 2009, at 12:11 and 28 January 2014, at 00:03). Their FPS (Nos. 11 and 25 in Fig. 1(b) and Tab. 2) show predominantly strike-slip mechanisms, most probably a steep WNW-ESE striking dextral fault.

Coastal part of Croatia
The coastal part of Croatia (Fig. 9) is tectonically complex area of the Adriatic microplate and External Dinarides. The broad contact zone of these tectonic units is where most of the earthquakes in Croatia occur.
In the SE domain (Fig. 10a) the average moment release rate is about 5.8 × 10 17 Nm/year, corresponding to an equivalent of one M w = 5.8 earthquake  per year since mid 15th century. The figure shows that the rate of moment release here was higher than average for about 200 years, until the great Dubrovnik earthquake that occurred in 1667. Afterwards the area was almost dormant for another two centuries, and the 'normal' seismicity with large earthquakes occurring every several decades resumed after the Skadar earthquake of 1855. The average moment release here is currently considerably lower than the long-term average.
It is interesting to compare the mean observed historical moment release rate to the one expected on the basis of known velocity of the Adria-Dinarides convergence estimated at u = 3-4 mm/year in this region (e.g. Battaglia et al., 2004;Serpelloni et al., 2005;D'Agostino et al., 2008;Weber et al., 2010). Considering the length of this zone (L ≈ 360 km), the seismogenic layer depth of D ≈ 15 km, average dip of the regional thrusts of d ≈ 45°, average shear wave velocity and density of the uppermost crust of b = 3.4 km/s, and r = 2600 kg/m 3 , respectively, and the seismic coupling coefficient C = 0.7-0.9 (Frohlich and Reiser Wetzel, 2007), average annual scalar moment release between M 0 = 4.8 × 10 17 Nm/year and M 0 = 8.3 × 10 17 Nm/year is obtained. This is in excellent agreement with the moment rate estimated above from historical seismicity.
The situation is considerably different in the NW domain (Fig. 10b) which exhibits considerably lower moment release rate of about 1.2 × 10 16 Nm/year in the last 300 years, equivalent to one M w = 4.6 event/year. Such a large difference between seismicity rates in the two domains is difficult to explain in terms of the Adria-Dinarides interaction. However, if one takes into account rather uncertain data from the catalogue extending back to the 14th century (see the inset in Fig.  10b), the overall picture changes, and indicates a possible seismic quiescence lasting for more than 500 years. Further elaboration of the problem of the low recent seismicity level here is outside the scope of this paper. Let's only note that the observed moment release in the last 90 years is considerably lower than the average in the last three centuries, and much lower than the complete historical record suggests.
During the 2006-2015 period about almost 10000 weak-to-moderate earthquakes were located in the NW domain of the coastal part of Croatia (see Fig 9). The most active here was the Ilirska Bistrica-Rijeka-Senj epicentral area, which spreads from Ilirska Bistrica in Slovenia towards the Krk Island, Crikvenicaand Senj, and includes parts of Gorski Kotar, Lika and Velika Kapela Mt. Among several felt events only two were of magnitudes M L ≥ 4.0. The first one that occurred on 5 February 2007 at 8:30 with magnitude M L = 4.9 and the maximum intensity I max = VII °MSK close to Drežnica (Tab. 1) was the strongest earthquake in Croatia during the observed ten years period. The macroseismic field survey revealed that some walls cracked in the villages between Drežnica and Jezerane. The cracks were also found between prefabricated con-crete elements on the school in Drežnica (about 30 years old building). Some landslides occurred on the road from Jasenak to Ledenice. The intensity distribution is shown in Fig. 11. The microseismic epicentre is located inunpopulated mountain area, out of the meizoseismal because the strongest intensities are caused by site effects in Drežnica and Jasenak. Ilirska Bistrica-Vinodol fault is probably responsible for the occurrence of this earthquake ( Fig. 1(a)), and the corresponding fault-plane solution (No. 4 in Fig. 1(b) and Tab. 2) in this case suggests predominantly strikeslip, right-lateral faulting mechanism. The most numerous earthquake sequence in the Ilirska Bistrica-Rijeka-Senj epicentral area occurred in the vicinity of Senj. The strongest earthquake occurred on 6 May 2011 at 23:44 (M L = 3.8). The maximum reported intensity was I max = V-VI °MSK (Fig. 12) in Brlog (where a tile slipped from the roof of a newly built house, a framed picture overturned, and observers stressed that everything was shaking) and Kompolje (where a barn cracked, and some jars fell from the shelves in the local store). Until the end of the month 68 weak aftershocks were recorded.
On 30 July 2013 at 12:58 ( Fig. 1(a) and Tab. 1) a strong earthquake with magnitude M L = 4.8 and the maximum intensity I max = VI °MSK occurred close to the source of the Senj-Drežnica event of 2007 (see above). Macroseismic investigations revealed that the highest intensities were observed in Brinje, where bottles tinkled and some of them fell off the shelves. Nine tiles moved on the roof of the post office building. Some observers ran outdoors. Observers in Križpolje stressed that they felt strong shaking, some of them even panicked. Some framed pictures fell from the walls. The intensity distribution is presented in Fig. 13. The microseismic epicentre is located within the meizoseismal near the Ilirska Bistrica-Vinodol fault which is most probable cause of this event. FPS (No. 22 in Fig. 1(b) and Tab. 2) is similar to the one of 5 February 2007 and is consistent with right-lateral strike slip faulting.
In the southern part of the Velebit Mt. epicentral area, in the Velebit channel, a felt earthquake (M L = 4.1) occurred on 21 June 2009 at 10:54 near Vinjerac. Observers felt that the ground trembled under their feet, the windows were shaking vigorously, but there was no reported damage. The intensity distribution is presented in Fig. 14. The focal mechanism (No. 12 in Fig. 1(b) and Tab. 2) describes predominantly reverse faulting with a sinistral component if a fault striking ESE-WNW and dipping to the NNE is taken to be the source of this event. Alternative solution is the reverse fault with dextral component striking NNW-SSE and steeply dipping to the WSW. An earthquake with magnitude M L = 4.1 was recorded on 13 August 2007, at 13:58 in the northern Adriatic submarine area near the Istrian peninsula, approximately 18 kilometres west from Rovinj and the Lim channel (No. 6 in Fig. 1(b) and Tab. 2). Because earthquake occurrence here is quite rare, and its epicentre lies close to the off-shore gas-field Ivana, it is possible that this event was induced by gas extraction. The FPS indicates that the P-axis strikes WNW-ESE, perpendicularly to the prevalent direction of the P-axes in the surrounding regions (e.g. Herak et al., 2016), which also suggests that local stress changes related to fluid extraction could have been responsible for the occurrence of this event. However, let's note that a similar mechanism was reported by Renner and Slejko (1994)  is accepted as the more probable over the one striking perpendicularly to the coastline.
The SE domain of the coastal part (see Fig. 9) is the most seismically active region in Croatia and its surroundings considered here. We were able to locate over 19000 earthquakes that occurred here between the years 2006 and 2015, with magnitudes up to 4.9. During the analysed period most of the earthquakes occurred in its northeastern parts, comprising the epicentral areas in Bosnia and Herzegovina and the border region with Croatia (epicentral areas of Dinara-Kamešnica Mt., Livno-Kupres, Imotski-Grude, Metković-Mostar and Glamočko Polje). The strongest one occurred in the Imotski-Grude epicentral area near Posušje in Bosnia and Hercegovina, on 21 June 2009 at 11:20, with magnitude M L = 4.9. Its FPS (No. 13 in Fig. 1(b) and Tab. 2) suggests a reverse causative fault of Dinaric strike with some dextral component. The maximum intensity of VI °MSK was reported in Zagvozd, Imotski, Svib and Aržano. The intensity distribution is presented in Fig. 15. Two events had the magnitude M L = 4.5. The  Fig. 1(b) and Tab. 2). The second one occurred in the Livno-Kupres epicentral area on 20 June 2010 in the vicinity of the Buško Blato lake near Livno, and FPS suggests mostly strike slip faulting on a steep dextral fault of Dinaric strike (No. 14 in Fig. 1(b) and Tab. 2). 15 more earthquakes with magnitudes ranging from 4.0 to 4.4 occurred here (Tab. 1), among which the most prominent seismicity is the one of the Glamočko Polje area. The most intense seismic activity occurred here during the August-October period in the year 2012, when a sequence of 600 weak earthquakes were recorded. The strongest among them occurred on 3 August 2012 at 19:57 near Glamoč, with magnitude M L = 4.4. This was also a strike-slip event (No. 19 in Fig. 1(b) and Tab. 2), either on a S-N striking dextral fault, or on a E-W striking sinistral one.
On the Croatian side of the border area with Bosnia and Herzegovina, the event of magnitude M L = 4.7 occurred on 18 November 2013 at 7:58 beneath the Kamešnica Mt. (Tab. 1). The maximum intensity of VI-VII °MSK was reported in Vržerale and Orguz in Bosnia and Herzegovina, where tiles slipped off the roofs, rocks tumbled down the hill, some walls cracked, and the gable end of an old house fell down. The intensity of VI °MSK was reported in Otok (some framed pictures fell down, some drywall panels cracked, one chandelier fell from the school ceiling and many people ran outdoors), Grab (walls cracked in the corners of an old house, and some tiles on the roof shifted), Tijarica and Tijarica-Tarabnik (where roof tiles rattled and slid, some walls and some nailed tiles on the roof cracked). The intensity distribution is shown in Fig. 16. The NW-SE elongation of the isoseismals corresponds to the preferred seismic energy propagation along the fault system of reverse faults striking mostly in the W-E to NW-SE direction (Imotski fault, Mosor Mt.-Biokovo Mt. fault, Fig. 1(a)), as it is generally true for earthquakes in the southern coastal part of Croatia. FPS (No. 23 in Fig. 1(b) and Tab. 2) presents mostly reverse faulting along the fault striking either E-W (dipping to the N), or WNW-ESE (dipping to the SSW).
The southern Croatian coastline area exhibited only moderate seismicity during the studied ten year period. The most active were Split, Ploče and Ston-Dubrovnik epicentral areas.
About 17 km northwest from Split, between Trogir and Muć, a sequence of 37 earthquakes was recorded during the first three months in 2013. The sequence started on 17 January with the first of two earthquakes with magnitude M L = 4.1. It was felt with the maximum intensity of I max = V-VI °MSK in Muć (Fig. 17). The second one occurred on 4 February 2013 (I max = V °MSK). The FPS of the first earthquake (No. 20 in Fig. 1(b) and Tab. 2) points to the pure reverse faulting, Most probably on a fault dipping to the NNE.
Two more earthquakes with magnitudes larger than 4.0 were recorded in the Adriatic submarine area during the 2006-2015 period. The first of them occurred near Ploče in the Neretva Channel (29 December 2013, 6:54, M L = 4.5) where it was felt with maximum intensity of I max = V °MSK (in Ploče, Gradac, Baćina, Spilice and Vina), as presented in Fig. 18. Its FPS (No. 24 in Fig. 1(b) and Tab. 2) shows reverse faulting, most probably on a ESE-WNW striking, low-dipping fault. The second one occurred in the Ston-Dubrovnik area 4 km southwest from Lopud island near Dubrovnik (31 March 2008, 00:14, M L = 4.0) where it was felt with the maximum intensity of I max = V °MSK in Lopud, Šipanska Luka and Zaton Mali. The focal mechanism (No. 8 in Fig. 1(b) and Tab. 2) is similar to the previously mentioned one.
The central Adriatic Sea epicentral area exhibited weak seismicity during the observed period, with occurrence of relatively frequent but weak earthquakes (M L = 3.9) in the three epicentral areas near the islands of Jabuka, Svetac and Vis. Following the two large earthquake sequences with the mainshocks that occurred on 29 March 2003 at 17:42 (M L = 5.5), and on 25 November 2004 at 6:21, M L = 5.2 (described by Herak et al., 2005, andIvančić et al., 2006), during the observed period the seismicity near Jabuka island was low. Frequent occurrence of earthquakes near the island of Svetac started after March 2011, with three earthquakes with magnitudes exceeding 3.0 in April 2011 (the strongest one had magnitude M L = 3.6). The Svetac island earthquake sequence lasted until the end of May (with 70 recorded earthquakes).
The seismicity of the Vis island epicentral area increased two years later, after the M L = 3.6 magnitude earthquake on 10 January 2014. Out of 230 events recorded near Vis in the whole observed period, 170 occurred during the year of 2014.
The seismicity of the southern part of the Adriatic Sea was weak, with only one earthquake with magnitude larger than 4.0, which occurred approximately 30 km southeast from the Palagruža island on 4 June 2010, at 18:44, with M L = 4.2.

Conclusions
Seismic activity of Croatia and its surrounding areas in the period 2006-2015 was weak to moderate and confined to the previously identified seismically active zones. The majority of 36733 located earthquakes occurred in the coastal region of Croatia. All well located earthquakes were shallow and occurred in the upper crust up to the depth of 20 km. The historical seismicity of both continental and coastal regions of Croatia shows that their seismic potential are considerable. It is noteworthy to observe that both regions seem to currently be in the strain accumulation phase.