Seismicity and earthquake focal mechanisms in North-Western Croatia

Herak, Davorka; Herak, Marijan; Tomljenović, Bruno

doi:10.1016/j.tecto.2008.12.005

Cited by 77 publications

(84 citation statements)

References 17 publications

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“…Medvednica into the NE and SW re gions) cor re sponds to the NW-strik ing Kašina Fault zone. This is also in good agreement with fault-plane so lu tions re ported by Herak et al (2009) and Pondrelli et al (2006), and con se quently sub-hor i zon tal to mod er ately dip ping P-axis, pre dom i nantly N-S di rected in the cen tral part, to NW-SE and NE-SE di rected in the west ern and east ern parts of this area.…”

Section: Discussionsupporting

confidence: 86%

“…The iden ti fied ar eas cor re late well with the south west ern seg ment of the North Medvednica Bound ary Fault (steeply SSE-dip ping re verse fault zone po si tioned along side the SW cor ner of NW moun tain front) and NW Kašina Fault zone (right-lat eral strike-slip fault) which, ac cord ing to Herak et al (2009), rep re sent a ma jor seismogenic source for his tor i cal earth quakes and pres ent-day seis mic ity.…”

Section: Discussionmentioning

confidence: 54%

“…Medvednica drain age bas ins that we then com pared to sepa rate those rep re sent ing tec toni cally ac tive vs. in ac tive sub-areas. These new data were then com pared with the re sults from pre vi ous geomorphologic, neotectonic and seismotectonic stud ies of this area (Heaeimoviae, 1984(Heaeimoviae, , 2000Prelogoviae et al, 1998;Tomljenoviae and Csontos, 2001;Tomljenoviae et al, 2008;Herak et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

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Identification of tectonically active areas using DEM: a quantitative morphometric analysis of Mt. Medvednica, NW Croatia

Matoš

Tomljenović

Trenc

2013

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1 Fac ulty of Min ing, Ge ol ogy and Pe tro leum En gi neer ing, Uni ver sity of Zagreb, Pierottijeva 6, Zagreb, Croatia Mt. Medvednica is an inselberg in NW Croatia, which lies at the in ter sec tion be tween the Southeastern Alps, Northwestern Dinarides and Tisza Mega-Unit of the Pannonian Ba sin. Due to the Pliocene-Quaternary N-S di rected short en ing, Mt. Medvednica ex pe ri enced 1500-2000 m of dif fer en tial up lift and now ex poses pre-Neo gene and Neo gene tec tonic and stratigraphic units that are sur rounded by Pliocene-Quaternary sed i ments. This pa per eval u ates a set of quan ti ta tive morphometry meth ods used to iden tify tec toni cally ac tive ar eas within this re gion characterized by low-rate ac tive fold ing and fault ing dur ing the Pliocene-Quaternary. Our anal y sis em ployed ex trac tion of hypsometric curves, cal cu la tion of a hypsometric in te gral, asym me try fac tor, and sta tis ti cal pa ram e ters of lon gi tu di nal stream pro files along 36 drain age bas ins de lin eated from a 25 m res o lu tion DEM of Mt. Medvednica area. De spite lithological het er o ge ne ity of the study area, the morphometric pa ram e ters we ob tain are good in di ca tors for dis crim i nat ing tec toni cally ac tive from in ac tive ar eas. We in terpret that the most tec toni cally ac tive ar eas are lo cated at the SW cor ner and in the cen tral part of Mt. Medvednica, where they are likely re lated to the North Medvednica Bound ary Fault, and to the Kašina Fault, re spec tively. The lat ter di vides the range into dis tinct NE and SW mor pho log i cal and struc tural ar eas.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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Identification of tectonically active areas using DEM: a quantitative morphometric analysis of Mt. Medvednica, NW Croatia

Matoš

Tomljenović

Trenc

2013

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“…Kalnik Fault Zone (KFZ) and DDBFZ (Figs. 1 and 2) re spec tively (Herak et al, 2009;Matoš et al, 2016).…”

Section: Introductionmentioning

confidence: 90%

“…Kalnik Fault Zone ( Fig. 1) with most foci con cen trated at depths be tween 5 and 17 km (Herak et al, 2009). Though the re la tion ship be tween the lo ca tions of the re cent ac tive faults and on go ing seis mic ity is poorly constrained, fo cal-mech a nism so lu tions (FMS) in the Bilogora area ob tained from the earth quakes with mag ni tudes over 3.5 in dicate the prev a lence of compressional and transpressional stress re gimes (Herak et al, 2009).…”

Section: Historical and Instrumental Records Of Seismicity In Bilogoramentioning

confidence: 99%

Quaternary fault activity in the SW Pannonian Basin: GPR surveying in Bilogora (NE Croatia)

Matoš

Zajc

Kordić

et al. 2016

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Seismic microzoning of the Delhi metropolitan area, India— I: Seismicity modeling

Gupta

Lee

Trifunac

2022

Earthquake Engineering and Resilience

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Seismic activity parameters ( a $a$ and b $b$ values in a Gutenbdataer–Richter relationship, maximum magnitude M max ${M}_{\max }$, and predominant focal depths H $H$) have been estimated for a grid of square cells of size 0.1° in latitudes and longitudes covering a large region bound by 24°−33°N and 72°−82°E to define input seismicity for microzoning of the Delhi metropolitan area. For this purpose, seven area types of seismic sources are first identified from a detailed seismotectonic evaluation of the region. Two of these sources form part of the Northwestern Himalaya and the remaining five encompass the intraplate area including and surrounding the National Capital Region. The seismic activity parameters are then estimated for each source zone by compiling a comprehensive catalog of 4483 past earthquakes with magnitudes of 2.0 or more covering the 1720–2020 period. All the grid cells in each source are initially assigned the same values of parameters b $b$, M max ${M}_{\max }$, and H $H$ as those for the source zone; whereas parameter a $a$ has been redefined for each grid cell using the cumulative occurrence rate of earthquakes above the minimum magnitude of completeness for the source zone. To account for possible uncertainties in past earthquake locations, values of the activity parameters thus assigned to all the grid cells in the region are spatially smoothed using an elliptical Gaussian kernel with a major axis along the predominant strike direction for the source zone of each grid cell. The grid cells across the source zone boundaries are also included in the smoothing process to normalize the effects of any subjectivity introduced in defining the source zone boundaries. Our estimations of seismic activity parameters thus obtained can be considered in the development of a robust and physically realistic seismicity model for practical engineering applications, which was made possible by our use of a sufficiently long duration of the earthquake catalog along with complete reporting of data up to magnitudes very close to the expected maximum magnitude in each source zone. We have also estimated the seismic activity parameters for the Hindu Kush subduction zone, which is then idealized by a point source.

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Seismicity and earthquake focal mechanisms in North-Western Croatia

Cited by 77 publications

References 17 publications

Identification of tectonically active areas using DEM: a quantitative morphometric analysis of Mt. Medvednica, NW Croatia

Identification of tectonically active areas using DEM: a quantitative morphometric analysis of Mt. Medvednica, NW Croatia

Quaternary fault activity in the SW Pannonian Basin: GPR surveying in Bilogora (NE Croatia)

Seismic microzoning of the Delhi metropolitan area, India— I: Seismicity modeling

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