Seismic response and vulnerability of historical Trakošćan Castle, Croatia using HVSR method

Stanko, Davor; Markušić, Snježana; Strelec, Stjepan; Gazdek, Mario

doi:10.1007/s12665-015-5185-x

Cited by 19 publications

(17 citation statements)

References 16 publications

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“…Kalnik North faults (reverse and strike slip) stretching along the mountain chains and Bednja River [33]. northwest towards Slovenia) due to topographic effects from pronounced polarization and directionality of ground motion stemming from the alluvial basin of Bednja River to the hilltop where the Castle is situated [8,34].…”

Section: Seismicity Of the Wider Ivanec Areamentioning

confidence: 99%

“…It should also be mentioned that historical Trakošćan Castle suffered serious damage in the 1982 earthquake (approx. 20 km in northwest towards Slovenia) due to topographic effects from pronounced polarization and directionality of ground motion stemming from the alluvial basin of Bednja River to the hilltop where the Castle is situated [8,34].…”

Section: Geological Characteristics Of the City Of Ivanec Areamentioning

confidence: 99%

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Assessment of the Seismic Site Amplification in the City of Ivanec (NW Part of Croatia) Using the Microtremor HVSR Method and Equivalent-Linear Site Response Analysis

et al. 2019

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The city of Ivanec is located between valley of the Bednja River and Mt. Ivanščica and this area can be prone to significant seismic site amplification due to local site characteristics. This study presents the first assessment of seismic site amplification for the city of Ivanec by the microtremor horizontal-to-vertical-spectral-ratio (HVSR) method and the equivalent-linear (EQL) site response analysis. Based on microtremor measurements and HVSR analysis, fundamental soil frequency and HVSR peak amplitude maps indicate potentially seismic danger zones. The 1-D EQL site response analysis was performed using multiple suites of earthquake ground motions scaled to the 95-and 475-year return periods of peak ground accelerations. Site amplification maps at the predominant peak frequency and ground surface indicate two microzones, one with high amplification in the central part of the city due to soft soil characteristics, and the other with small amplification in the transitional zone from alluvial basin towards the foothills of Mt. Ivanščica. HVSR peak amplitudes and site response peak amplifications showed similar spatial distributions with similar predominant peak frequencies but with different amplitude levels. Site amplification maps provided significant information about potential resonance effects for structures of certain heights that can be correlated with the local ground shaking characteristics.

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Section: Seismicity Of the Wider Ivanec Areamentioning

confidence: 99%

Section: Geological Characteristics Of the City Of Ivanec Areamentioning

confidence: 99%

Assessment of the Seismic Site Amplification in the City of Ivanec (NW Part of Croatia) Using the Microtremor HVSR Method and Equivalent-Linear Site Response Analysis

et al. 2019

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“…The HVSR methodology proposed by Nakamura (1989) has been used in numerous studies to estimate local seismic ground response as expressed by natural or fundamental frequency (f res ) of soils and HVSR spectral peak amplification, particularly in the broader study area, e.g. in Slovenia (Gosar, 2007;Gosar and Martinec, 2009;Gosar et al, 2010), in Italy (Mucciarelli and Gallipoli, 2001;Di Giacomo et al, 2005;Del Monaco et al, 2013;Panzera et al, 2013) and in Croatia (Herak et al, 2010;Herak, 2011;Stanko et al, 2016Stanko et al, , 2017.…”

Section: Geological Features and Seismic Activitymentioning

confidence: 99%

Estimation of near-surface attenuation in the tectonically complex contact area of the northwestern External Dinarides and the Adriatic foreland

Markušić

Stanko

Korbar

et al. 2019

Nat. Hazards Earth Syst. Sci.

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Seismically induced ground motion at a site is generally influenced by the seismic source, the propagation path and the local site conditions. Over the last several decades, researchers have consistently asserted that for near-site attenuation, the spectral parameter κ is subject primarily to the site conditions. In this research, we estimated the parameter κ based on the acceleration amplitude spectrum of shear waves from local earthquakes recorded by seismological stations situated in the western part of Croatia from the slope of the high-frequency part. The spatial distribution of κ values is comparable with seismological, geophysical and geological features, with the published coda-Q values for each station as well as with the isoseismal maps for selected stronger earthquakes in the study area. The complex pattern of longitudinal and transversal major late-orogenic fault zones dissecting early-orogenic thin-skinned tectonic cover in the Kvarner area and the shallow depth to the Moho (Mohorovičić discontinuity) in the Adriatic foreland (southern Istria) are probably responsible for a significant part of wave attenuation and for the anisotropy of attenuation. Regional near-surface attenuation distribution and modelled macroseismic fields point to the conclusion that attenuation properties of rocks in the northwestern External Dinarides are far from isotropic, and the most likely anisotropy sources are the preferential orientations of cracks and fractures under the local tectonic stress field, trapping of waves along major faults (waveguides), and/or attenuation within the fault zones. These results are important for gaining further insight into the attenuation of near-surface crust layers in the northwestern External Dinar-ides and the associated Adriatic foreland as well as in similar geotectonic settings.

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“…However, it has been employed to characterize site V s velocity profiles for engineering purposes, including amplification for ground shaking (Konno and Ohmachi, 1998;Del Monaco et al, 2013;Castellaro, 2016;Stanko et al, 2016Stanko et al, , 2017. However, it has been employed to characterize site V s velocity profiles for engineering purposes, including amplification for ground shaking (Konno and Ohmachi, 1998;Del Monaco et al, 2013;Castellaro, 2016;Stanko et al, 2016Stanko et al, , 2017.…”

Section: Introductionmentioning

confidence: 99%

“…There is an extensive literature related to the HVSR method, and it is beyond the scope of this paper to provide a comprehensive review. However, it has been employed to characterize site V s velocity profiles for engineering purposes, including amplification for ground shaking (Konno and Ohmachi, 1998;Del Monaco et al, 2013;Castellaro, 2016;Stanko et al, 2016Stanko et al, , 2017.…”

Section: Introductionmentioning

confidence: 99%

Application of HVSR to estimating thickness of laterite weathering profiles in basalt

Nelson

McBride

2019

Earth Surf Processes Landf

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Lateritic weathering profiles (LWPs) are widespread in the tropics and comprise an important component of the Critical Zone (CZ). The Hawaiian Islands make an excellent natural laboratory for examining the tropical CZ, where the bedrock composition (basalt) is nearly uniform and rainfall varies greatly. This natural laboratory is employed to assess the utility of the HVSR (horizontal/vertical spectral ratio) method to characterize the shear‐wave velocity (Vs) structure of LWPs, particularly the depth to the contact between saprolite and basalt bedrock. LWP thicknesses determined from HVSR provide good agreement with multi‐channel analysis of surface waves (MASW) profiles, well logs and outcrop. LWP thicknesses may be estimated from the fundamental mode equation or through forward models. Prior knowledge about the subsurface from well, outcrop, and MASW profiles may greatly aid modeling in some cases. For the 3.2 to 1.8 Ma Koolau Volcano on Oahu, the downward rate of advance of the weathering front varies from 0.004 to 0.041 m/ka. For the 0.44 to 0.10 Ma Kohala Volcano (Big Island of Hawaii) rates vary from 0.013 to 0.047 m/ka. Simple H/V spectra develop in areas where the combined effects of time and elevated rainfall produce thick LWPs with a flat base and a general absence of core stones with an ideal layered geometry. Abundant buried core stones violate the assumption of simple layered geometries and scatter acoustic energy, leading to uninterpretable results. This is common where low rainfall and a young basaltic substrate leave abundant core stones as well as an undulating contact between saprolite and bedrock. Velocity inversions (high Vs intervals within low Vs saprolite) may also be present and originate from relatively intact bedrock horizons or mineralogical changes within saprolite. At Kohala, a gibbsite‐rich horizon produces such a velocity inversion due to enhanced weathering and subsequent collapse of saprolite in a discrete horizon. © 2019 John Wiley & Sons, Ltd.

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Seismic response and vulnerability of historical Trakošćan Castle, Croatia using HVSR method

Cited by 19 publications

References 16 publications

Assessment of the Seismic Site Amplification in the City of Ivanec (NW Part of Croatia) Using the Microtremor HVSR Method and Equivalent-Linear Site Response Analysis

Assessment of the Seismic Site Amplification in the City of Ivanec (NW Part of Croatia) Using the Microtremor HVSR Method and Equivalent-Linear Site Response Analysis

Estimation of near-surface attenuation in the tectonically complex contact area of the northwestern External Dinarides and the Adriatic foreland

Application of HVSR to estimating thickness of laterite weathering profiles in basalt

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