Estimation of Site Effects in Beijing City

Ding, Zhongli; Chen, Y. T.; Panza, G. F.

doi:10.1007/s00024-003-2495-9

Cited by 13 publications

(4 citation statements)

References 11 publications

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“…account, and it is therefore possible a detailed study of the wavefield that propagates even at large distances from the epicenter. The procedure is described in some detail by Panza et al (2001, and it has been employed in several studies worldwide (e.g., Ding et al 2004;Parvez et al 2003Parvez et al , 2006Zuccolo et al 2008;Mohanty et al 2009;Vaccari et al 2011). The input parameters to be specified are the seismic source parameters of an earthquake scenario and the structural models through which the seismic waves propagate from the source to the site of interest.…”

Section: Methodsmentioning

confidence: 99%

“…Further, the effect of epicentral distance is analysed keeping source parameters fixed and equal to those of the Shillong earthquake. The adopted method is innovative and at the same time a well-established one and has been employed in several site response studies worldwide (e.g., Ding et al 2004;Parvez et al 2003Parvez et al , 2006Zuccolo et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Influence of epicentral distance on local seismic response in Kolkata City, India

et al. 2013

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The influence of source and epicentral distance on the local seismic response in the Kolkata city is investigated by computing the seismic ground motion along 2-D geological cross-sections in the Kolkata city for the earthquake that occurred on 12 June 1897 (M w = 8.1; focal mechanism: dip = 57 • , strike = 110 • and rake = 76 • ; focal depth = 9 km) in Shillong plateau. For the estimation of ground motion parameters, a hybrid technique is used, which is the combination of modal summation and finite difference method. This technique allows the estimation of site specific ground motion for various events located at different distances from Kolkata city, taking into account simultaneously the position and geometry of the seismic source, the mechanical properties of the propagation medium and the geotechnical properties of the site. The epicenter of the Shillong earthquake is about 460 km away from Kolkata. The estimated peak ground acceleration (PGA) varies in the range of 0.11-0.18 g and this range corresponds to the intensity of IX to X on the Mercalli-Cancani-Sieberg (MCS) scale and VIII on the Modified Mercalli (MM) scale. The maximum amplification in terms of response spectral ratio (RSR) varies from 10 to 12 in the frequency range 1.0-1.5 Hz. These amplifications occur in correspondence to low-velocity shallow, loose soil deposit. The comparison of these results with earlier ones obtained considering the Calcutta earthquake that occurred on 15 April 1964 (M w = 6.5; focal mechanism: dip = 32 • , strike = 232 • and rake = 56 • ; focal depth = 36 km) shows that the source parameters (magnitude and focal mechanism) and epicentral distance play an important role on site response but the variation in the frequency of the peak values (RSR) is negligible. The obtained results match with observed reported intensities in Kolkata region.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of epicentral distance on local seismic response in Kolkata City, India

et al. 2013

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“…The potential criteria influencing local seismic amplification susceptibility were determined through a critical review of literature. By reviewing documents on earthquake engineering, seismology, geology, tectonic and structural engineering, geomorphology, and seismic microzonation reports and guidelines (Fäh et al, 1997;Ding et al, 2004;Molina et al, 2010;Mundepi et al, 2010;Marulanda et al, 2012;Hassanzadeh et al, 2013;FEMA, 2014;Fraume et al, 2014;Grelle et al, 2014Grelle et al, , 2016SM Working Group, 2015;Rehman et al, 2016;Nwe and Tun, 2016;GEM, 2017;CAPRA, 2017;Michel et al, 2017;Trifunac, 2016;Hassanzadeh and Nedovic-Budic, 2016), in total 14 influencing criteria were identified (Table 1).…”

Section: Determining the Relevant Criteria By Reviewing Literaturementioning

confidence: 99%

New approaches to modelling of local seismic amplification susceptibility using direct characteristics of influencing criteria: case study of Bam City, Iran

Hassanzadeh¹,

Honarmand²,

Hosseinjanizadeh³

et al. 2019

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper proposes a new model in evaluating local seismic amplification susceptibility by considering direct characteristics of influencing criteria and it deals with uncertainty of modelling through production of fuzzy membership functions for each criterion. For this purpose, relevant criteria were identified by reviewing previous literature. These criteria include alluvial thickness, stiffness and strength of alluvial deposits, type of soil and particle size distribution of alluvial deposits, depth of groundwater, type of rock, topographic irregularities, slope, and type of bedrock. Two methods, analytic hierarchy process (AHP) and fuzzy logic (FL), were applied in order to define priority rank of each criterion and sub-criteria of each criterion through interview data of 10 experts. The criteria and sub-criteria were combined using the weighted linear combination method in GIS to develop a model for assessing local seismic amplification susceptibility in the study area of Bam City, Iran. The model's output demonstrated high to very high seismic amplification levels in central, eastern, northeastern, and northern parts of the study area. The validation results based on overall accuracy and kappa statistics showed 73.6 % accuracy, with 0.74 kappa indicating a good fit to the model's output. This model assists planners and decision makers in determining local seismic amplification susceptibility to be incorporated in designing new development plans of urban and rural areas and in making informed decisions regarding safety measures of existing buildings and infrastructures.

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“…The modeling of the seismic ground motion, for both the Tangshan and the Zhangbei earthquakes shows that the thick Quaternary sedimentary cover amplifies the peak values and increases the duration of the seismic ground motion in the north-western part of the City. Therefore the thickness of the Quaternary sediments in Beijing City is the key factor that controls the local ground effects, and, as it can be seen from Figure 18, four zones are defined on the base of the different thickness of the Quaternary sediments (Ding et al, 2002b). The response spectra computed for each zone (Figure 23 caused intensity VII on the MSK scale, roughly equivalent to intensity VIII (MCS) (Decanini et al, 1995).…”

Section: Figure 15 the Geological Map Of Delhi And The Position Of Nmentioning

confidence: 99%

Realistic modeling of seismic input for megacities and large urban areas (the UNESCO/IUGS/IGCP project 414)

Panza

Szeidovitz

Parvez³

et al. 2002

Episodes

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The project addressed the problem of pre-disaster orientation: hazard prediction, risk assessment, and hazard mapping, in connection with seismic activity and maninduced vibrations. The definition of realistic seismic input has been obtained from the computation of a wide set of time histories and spectral information, corresponding to possible seismotectonic scenarios for different source and structural models. The innovative modeling technique, that constitutes the common tool to the entire project, takes into account source, propagation and local site effects. This is done using first principles of physics about wave generation and propagation in complex media, and does not require to resort to convolutive approaches, that have been proven to be quite unreliable, mainly when dealing with complex geological structures, the most interesting from the practical point of view. In fact, several techniques that have been proposed to empirically estimate the site effects using observations convolved with theoretically computed signals corresponding to simplified models, supply reliable information about the site response to non-interfering seismic phases. They are not adequate in most of the real cases, when the seismic sequel is formed by several interfering waves. The availability of realistic numerical simulations enables us to reliably estimate the amplification effects even in complex geological structures, exploiting the available geotechnical, lithological, geophysical parameters, topography of the medium, tectonic, historical, palaeoseismological data, and seismotectonic models. The realistic modeling of the ground motion is a very important base of knowledge for the preparation of groundshaking scenarios that represent a valid and economic tool for the seismic microzonation. This knowledge can be very fruitfully used by civil engineers in the design of new seismoresistant constructions and in the reinforcement of the existing built environment, and, therefore, supply a particularly powerful tool for the prevention aspects of Civil Defense. We present a selection of the main results obtained for the cities of Algiers,

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Estimation of Site Effects in Beijing City

Cited by 13 publications

References 11 publications

Influence of epicentral distance on local seismic response in Kolkata City, India

Influence of epicentral distance on local seismic response in Kolkata City, India

New approaches to modelling of local seismic amplification susceptibility using direct characteristics of influencing criteria: case study of Bam City, Iran

Realistic modeling of seismic input for megacities and large urban areas (the UNESCO/IUGS/IGCP project 414)

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