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1.
A microtremor HVSR study of the seismic site effects in the area of the town of Brežice (SE Slovenia)
Andrej Gosar, 2009, izvirni znanstveni članek

Opis: The wider region of Brežice is one of the most seismically active areas of Slovenia. The most damaging earthquake occurred in 1917, when Brežice was hit by an ML=5.7 earthquake that had an VIII MSK maximum intensity. Seismic site effects due to Quaternary sediments can be expected in the whole area of the town. Since there is a lack of boreholes and geophysical data to assess the site effects, the microtremor (ambient vibrations) horizontal-to-vertical spectral ratio (HVSR) method was applied at 113 free-field measuring points. In general, clear spectral peaks were obtained, but there were also examples of flat spectral ratios indicating a low impedance contrast between the sediments and the bedrock. A map of the sediment resonance frequency was drawn, which shows a frequency range of 1–15 Hz. In the southern part of the town higher frequencies correspond to the thin sediments (the Brežice terrace and the middle Sava terrace) and the high HVSR peak amplitudes indicate a great impedance contrast with the Sarmatian and Badenian bedrock. The northern part is characterized by very low frequencies, indicating thick sediments (Plio-Quaternary gravel) and a small impedance contrast with Pontian marl. The transition between the high and low frequencies is relatively steep. In addition, measurements were performed in 12 characteristic houses to assess the longitudinal and transverse building frequencies. The established building frequency range of 5–10 Hz indicates some areas in the southern part of the town where there is a potential danger of soil-structure resonance. Two buildings show direct evidence of a potential soil-structure resonance. According to this study, more pronounced seismic site effects are expected in the southern part of Brežice.
Ključne besede: ambient vibrations, microtremors, horizontal-to-vertical spectral ratio (HVSR), seismic site effects, soil-structure resonance
Objavljeno: 06.06.2018; Ogledov: 337; Prenosov: 40
.pdf Celotno besedilo (403,95 KB)
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2.
How to test the reliability of instruments used in mirotremor horizontal-to-vertical spectral ratio measurements
Izidor Tasič, Franc Runovc, 2010, izvirni znanstveni članek

Opis: The reliability of a horizontal-to-vertical spectral ratio (HVSR) curve depends on the results obtained by a verified seismological system. Seismic microzonation provides the basis for a site-specific risk analysis and it can be evaluated using the microtremor HVSR method, where the data are recorded using modern seismological systems. Changes in the transfer function of seismological systems affect the HVSR curve and, consequently, also its interpretation, if these changes are not detected and taken into consideration while performing the microtremor spectral calculations. The reliability of the seismic microzonation performed by such a procedure becomes questionable. An algorithm is developed with a two references system, where the influence of the transfer function on the HVSR curve by the tested system can be evaluated without any a-priori knowledge regarding the transfer functions of any of the systems. This approach is applied to a Lennartz Le-3D/5s seismometer and to a TROMINO seismological system, where two Streckeisen STS2 seismometers are used as the reference systems.
Ključne besede: seismic microzonation, horizontal-to-vertical spectral ratio method, ambient vibrations, microtremor, seismic system transfer function, reliability and calibration of seismic systems
Objavljeno: 11.06.2018; Ogledov: 139; Prenosov: 12
.pdf Celotno besedilo (201,91 KB)
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3.
Gledalec, objekt in prostor: Instalacija v drugi polovici 20. stoletja na Slovenskem
Deja Bečaj, 2019, magistrsko delo

Opis: Instalacija je umetniška zvrst, kjer gre za obsežna dela, ki se lahko širijo skozi več prostorov. Njena temeljna značilnost je, da morajo za »izgradnjo« umetniške celote sodelovati trije elementi: gledalec, objekt in prostor. Nanjo je vplivalo zlasti minimalistično kiparstvo, ki je od gledalca zahtevalo, da v svojem obravnavanje umetnine upošteva tudi prostor okoli predmeta. Nastali so ambienti, ki jih je pri nas prva ustvarjala Dragica Čadež (1940–). Ambient je za razliko od instalacije omejen na manjši prostor in je delil okolje z ostalimi predmeti, ki niso bili del postavitve. V osemdesetih in devetdesetih letih so tudi pri nas galerije postavitvam odrejale vse večje prostore, pogoste pa so bile tudi instalacije, ki so se razprostirale preko več sob. V devetdesetih letih so se umetniki začeli odmikati od institucij striktno namenjenim za razstave, hkrati pa je raslo zanimanje za ekološka vprašanja. Ustvarjali so postavitve v naravi (zlasti v sklopu projektov Kipi v vrtu in Štirje letni časi) in site-specific instalacije, ki za razliko od instalacije popolnoma izgubijo smisel, če jih premaknemo. Instalacija ostaja ena najbolj priljubljenih umetniških zvrsti, vendar zaradi poimenovanja, ki se ga pogosto enači z zgolj postavitvijo umetnine na določeno mesto, prihaja do zmede v obravnavanju instalacije kot samostojne umetniške zvrsti.
Ključne besede: instalacija, ambient, site-specific instalacija, instalacija na Slovenskem, aktivacija gledalca, postavitve v naravi
Objavljeno: 13.11.2019; Ogledov: 52; Prenosov: 10
.pdf Celotno besedilo (2,87 MB)

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