Experimental Study of Topographic Amplification Using the Israel Seismic Network

Zaslavsky, Y.; Shapira, Avi

doi:10.1080/13632460009350362

Cited by 22 publications

(8 citation statements)

References 26 publications

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“…In the absence of such data we can only suggest that the actual PGA value for the rock foundations at Kalaat Nimrod should be lower than 0.4g by up to a factor of 4, if we adopt the results of the topographic site effect measurements at four different sites in Israel [25].…”

Section: Applicability Of Our Resultsmentioning

confidence: 97%

Numerical analysis of block stone displacements in ancient masonry structures: A new method to estimate historic ground motions

Kamai

Hatzor

2007

Num Anal Meth Geomechanics

107

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SUMMARYAn innovative approach is presented, in which the discontinuous deformation analysis (DDA) method is used to estimate historic ground motions by back analysis of unique structural failures in archaeological sites. Two archaeological sites in Israel are investigated using this new approach and results are presented in terms of displacement evolution of selected structural elements in the studied masonry structure. The response of the structure is studied up to the point of incipient failure, in a mechanism similar to the one observed in the field. Structural response is found to be very sensitive to dynamic parameters of the loading function such as amplitude and frequency.Prior to back analysis of case studies, two validations are presented. Both compare the performance of DDA with analytical solutions and present strong agreement between the two.Using comprehensive sensitivity analyses, the most likely peak ground acceleration (PGA) and frequency that must have driven the observed block displacements are found for the two case studies-the Nabatean city of Mamshit and the medieval fortress of Nimrod in southern and northern Israel, respectively. It is found that horizontal peak ground accelerations (HPGA) of 0.5g and 1g were required to generate the observed deformations in Mamshit and Nimrod, respectively. Although these might seem too high, considering structural and topographic amplifications it is concluded that the analyses suggest ground motions of 0.2g at a frequency of 1.5 Hz for Mamshit and up to 0.4g at a frequency of 1 Hz for Nimrod. These values provide constraints on the seismic risk associated with these regions as appears in the local building code using a completely independent approach.

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Section: Applicability Of Our Resultsmentioning

confidence: 97%

Numerical analysis of block stone displacements in ancient masonry structures: A new method to estimate historic ground motions

Kamai

Hatzor

2007

Num Anal Meth Geomechanics

107

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“…The resulting topography calls for a possible topographic site effect at Masada. Theoretical considerations of topographic site effect and its influence on surface ground motion were observed and studied by many authors [20][21][22][23][24][25]; simulations of topographic amplifications have been performed using various theoretical methods [26,27]. These studies show that amplification up to factor ten and more can be expected at the ridge top.…”

Section: Topographic Site Effect At Masadamentioning

confidence: 97%

“…Although the Masada site is situated directly on rock, a significant topographic effect was recorded in the field [25,28], and it should therefore be considered in the development of the relevant input motion for the site. An empirical response function for Masada, developed on the basis of the field study discussed in Section 2.2 above, is shown in Fig.…”

Section: Incorporation Of Site Effectsmentioning

confidence: 99%

Dynamic stability analysis of jointed rock slopes using the DDA method: King Herod's Palace, Masada, Israel

Hatzor

Arzi²,

Zaslavsky

et al. 2004

International Journal of Rock Mechanics and Mining Sciences

179

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“…For example, it has been used to map the thickness of sediments in the Segura Valley, Spain (DELGADO et al, 2000), and the Lower Rhine Embayment, Germany (IBS-VON SEHT and WOHLENBERG, 1999); to characterize seismic hazards in small scale for seismic microzonation (see BARD, 1999 and references therein); or to estimate the topographical effects of ground shaking at mountains (ZASLAVSKY and SHAPIRA, 2000). The main reason for such a success is its simplicity both in field operations and data analysis.…”

Section: The Hvsr Techniquementioning

confidence: 99%

Microtremor Analyses at Teide Volcano (Canary Islands, Spain): Assessment of Natural Frequencies of Vibration Using Time-dependent Horizontal-to-vertical Spectral Ratios

Almendros

Luzón

Posadas

2004

Pure and Applied Geophysics

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We use time-dependent horizontal-to-vertical spectral ratios (HVSR) of microtremors to determine the dominant frequencies of vibration of the geological structures beneath several recording sites in the vicinity of Teide volcano (Canary Islands, Spain). In the microtremors, the time-dependent HVSRs (ratiograms) are a useful tool to discriminate between the presence of real dominant frequencies linked to resonances of the subsurface structure and the spurious appearance of peaks due to local transients. We verified that the results are repeatable, in the sense that microtremors recorded at the same site but at different times yield a very similar HVSR function. Two types of results are found: (1) sites where there is no resonance of the propagating microtremors, and therefore no value of a dominant frequency can be assessed; and (2) sites where a stationary peak in the HVSR is found and a dominant frequency related to resonance of the shallow structure can be estimated. These resonant frequencies show substantial spatial variations even for nearby sites, which reflects the complexity of the shallow velocity structure in the Las Can˜adas area. Large dominant frequencies occur near the caldera walls and also at a few locations that coincide with the intersections of the inferred rims of the three calderas forming Las Can˜adas. Small dominant frequencies also occur near the caldera rim, and may be due to discontinuities in the caldera wall and/or to local velocity anomalies. Intermediate frequencies are mostly found in the eastern part of the caldera, where a tentative profile of the basement depth has been obtained. Intermediate frequencies have also been measured south of Ucanca and south of Montan˜a Blanca. In view of the present results, we conclude that the use of ratiograms constitutes an improvement of the HVSR method and provides an appropriate tool to investigate the shallow velocity structure of a volcanic region.

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Experimental Study of Topographic Amplification Using the Israel Seismic Network

Cited by 22 publications

References 26 publications

Numerical analysis of block stone displacements in ancient masonry structures: A new method to estimate historic ground motions

Numerical analysis of block stone displacements in ancient masonry structures: A new method to estimate historic ground motions

Dynamic stability analysis of jointed rock slopes using the DDA method: King Herod's Palace, Masada, Israel

Microtremor Analyses at Teide Volcano (Canary Islands, Spain): Assessment of Natural Frequencies of Vibration Using Time-dependent Horizontal-to-vertical Spectral Ratios

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