scholarly journals Christchurch seismic hazard pilot study

1993 ◽  
Vol 26 (1) ◽  
pp. 14-27 ◽  
Author(s):  
J. B. Berril ◽  
R. O. Davis ◽  
I. F. McCahon
Keyword(s):  
Pilot Study ◽  
Transfer Functions ◽  
Site Response ◽  
Response Spectrum ◽  
Local Context ◽  
Borehole Data ◽  
Seismic Zonation ◽  
Good Test ◽  
Ground Shaking ◽  
The City

A pilot zoning study has been carried out for ground shaking hazard in the city of Christchurch, using the grade-3 procedures of the draft manual on seismic zonation for geotechnical hazards, being developed by Technical Committee TC-4 of the ISSMFE. Because of limited site data, we were not able to produce a complete zoning map for the city, but ground motions were estimated at six distinct sites for which borehole data was available, and this provided a good test for the procedures of the manual. The city of Christchurch is situated on nearly 1 km of volcanic rock and alluvial sediments overlying greywacke basement, on the edge of the main seismic region of New Zealand. In addition to being an interesting site from the point of view of ground shaking, there are also liquefaction and slope stability hazards in the alluvial and beach sands found throughout the city, and in the recent loess deposits mantling the adjacent Port Hills. In the pilot study of ground shaking hazard, a seismicity model for the central South Island region published recently by Elder et al. (1991) was combined with the attenuation model of Kawashima et al. (1984) recommended in the draft manual, to estimate rock motion at Christchurch, described by its acceleration response spectrum. Transfer functions were computed for the site response to estimate motions at the six selected sites using the Thomson-Haskell method. The results were highly sensitive to details of. the upper 30 m or so of the soil profile. In the local context, the large disparity between our estimates of ground shaking at Christchurch and those implicit in the draft revision of NZS 4203 are disturbing. According to our study the draft code underestimates shaking by about a factor of two or more.

Site response assessment at the city of Al Khobar, eastern Saudi Arabia, from microtremor and borehole data

2015 ◽  
Vol 8 (11) ◽  
pp. 10015-10030
Author(s):  
M. Alharbi ◽  
M. Fnais ◽  
A. Al-Amri ◽  
Kamal Abdelrahman ◽  
Meinrat O. Andreae ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Site Response ◽  
Response Assessment ◽  
Borehole Data ◽  
The City

scholarly journals 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

Geosciences ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 312 ◽  
Author(s):  
Stanko ◽  
Markušić ◽  
Gazdek ◽  
Sanković ◽  
Slukan ◽  
...  
Keyword(s):  
Site Response ◽  
Soft Soil ◽  
Site Amplification ◽  
Site Response Analysis ◽  
Response Analysis ◽  
Significant Information ◽  
Ground Shaking ◽  
Equivalent Linear ◽  
Hvsr Method ◽  
The City

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.

Chronotope of Siberia in the materials of the magazine “Nastoyashchee” (1928–1930)

2021 ◽  
pp. 96-105
Author(s):  
S. S. Vasilyev ◽  
Keyword(s):  
Decisive Role ◽  
Political Context ◽  
Prose Poetry ◽  
Local Context ◽  
Quick Response ◽  
Revolutionary Literature ◽  
Front Group ◽  
The City

The paper deals with the Novosibirsk magazine “Nastoyashchee” (The Present) (1928–1930). “Nastoyashchee” was oriented to the “fact literature”: the theory of new revolutionary literature developed by the LEF (Left Art Front) group, which emphasized the importance of the reflection of the truth of life. Hence, the importance of journalism increases, with feuilleton and essay becoming the most important genres. Such an attitude to the fact literature orients materials of the magazine to the local context understood rather broadly – as the context of Siberia and even the entire Asian part of the USSR. This understanding is considered on the example of all types of magazine materials: prose, poetry, folklore, illustrations, photography. It should be noted that the magazine’s attitude to the poetry was ambivalent: not only did it publish the poetry but also the articles with requests to stop writing poetry. Most significant was the literature of a quick response conforming to the current tasks of the proletariat. It is for this reason that most of the materials related to the fact literature had no ethnographic component, and the local was interesting not as exotic, but as correlating with USSR political context (the link between the city and the countryside, the organization of communes, the fight against the kulaks). The decisive role in writing is found to be inevitably assigned to sorting out the necessary facts illuminating life from the authors’ side of interest, making “Nastoyashchee” similar to the LEF group with their selecting and editing “facts-friends” and criticism of “facts-enemies.”

Performance Based Evaluation of Bridge Substructure in North Mississippi Using Nonlinear FEM and Field Vibration Measurement

2000 ◽  
Author(s):  
Chris L. Mullen ◽  
Prabin R. Tuladhar
Keyword(s):  
Finite Element ◽  
Transfer Functions ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Vibration Measurement ◽  
Elastic Behavior ◽  
Evaluation Procedure ◽  
Vibration Measurements ◽  
Linear Elastic ◽  
Performance Based Evaluation

Abstract Discussion of a Performance - Based Engineering evaluation procedure for an existing interstate highway bridge in north Mississippi. The bridge is in a highly trafficked location near the Memphis Metropolitan area and is reflective of modern design practices in Mississippi. Results are presented of nonlinear damage response and displacement ductility performance of the reinforced concrete bents and their foundations predicted using static finite element (FE) computations. The model considers the composite action of the concrete and the reinforcing steel materials under axial force, shear, torsion and flexure. The performance-based evaluation includes three-dimensional computational simulations of the nonlinear bridge system, including substructures and superstructure. The response spectrum dynamic analysis method will also be carried out on the linear elastic three-dimensional model to predict the linear elastic behavior. Field vibration measurements, including ambient and hammer-impact, were performed to calibrate the models. The computed transfer functions are currently being evaluated to correlate vibration measurements and the Finite element models.

scholarly journals Seismic risk assessment of architectural heritages in Gyeongju considering local site effects

2013 ◽  
Vol 13 (2) ◽  
pp. 251-262 ◽  
Author(s):  
H.-J. Park ◽  
D.-S. Kim ◽  
D.-M. Kim
Keyword(s):  
Risk Assessment ◽  
Cultural Heritage ◽  
Seismic Risk ◽  
Site Response ◽  
Response Spectrum ◽  
Primary Data ◽  
Seismic Risk Assessment ◽  
Heritage Sites ◽  
Geological Conditions ◽  
Site Period

Abstract. A seismic risk assessment is conducted for cultural heritage sites in Gyeongju, the capital of Korea's ancient Silla Kingdom. Gyeongju, home to UNESCO World Heritage sites, contains remarkable artifacts of Korean Buddhist art. An extensive geotechnical survey including a series of in situ tests is presented, providing pertinent soil profiles for site response analyses on thirty cultural heritage sites. After the shear wave velocity profiles and dynamic material properties were obtained, site response analyses were carried out at each historical site and the amplification characteristics, site period, and response spectrum of the site were determined for the earthquake levels of 2400 yr and 1000 yr return periods based on the Korean seismic hazard map. Response spectrum and corresponding site coefficients obtained from site response analyses considering geologic conditions differ significantly from the current Korean seismic code. This study confirms the importance of site-specific ground response analyses considering local geological conditions. Results are given in the form of the spatial distribution of bedrock depth, site period, and site amplification coefficients, which are particularly valuable in the context of a seismic vulnerability study. This study presents the potential amplification of hazard maps and provides primary data on the seismic risk assessment of each cultural heritage.

scholarly journals The conflict between attempts to green arid cities and urban livelihoods The case of Dodoma, Tanzania

2003 ◽  
Vol 10 (1) ◽  
pp. 25 ◽  
Author(s):  
Aldo Lupala ◽  
John Lupala
Keyword(s):  
Climatic Conditions ◽  
Capital City ◽  
Local Context ◽  
City Development ◽  
Local Conditions ◽  
Master Plans ◽  
Contributory Factors ◽  
Urban Livelihoods ◽  
Planning Concepts ◽  
The City

One of the features that characterise the designated capital city of Dodoma is the limited green landscape element as a result of semiarid climatic conditions of the whole central region of Tanzania. Besides concerted efforts by the Dodoma urban authorities to develop greenery landscape within the city through the Capital City Development Programme, such efforts have fallen into conflict with people’s livelihood activities. In this paper, it is argued that the gap between identification of appropriate landscape features that are not consistent with people's lifestyles and the local conditions are the contributory factors to the observed conflicts between attempts to green the city and livelihoods of the residents. Borrowed planning concepts in the masterplans thatwere imposed on the contextof Dodoma do not reflectthe realityof thepeople's needs and priorities as regards their livelihoods. These concepts have to the greatest extent failed to integrate livelihood activities and greening initiatives. This paper underscores the need for developing locally based planning considerations that take cognisance of all stakeholders and the local context as a way towards harmonising greening initiatives while accommodating people's livelihood needs and activities.Key Words: greening initiatives, livelihood activities, semi-arid cities, urban planning, master plans, Dodoma, Tanzania. 

scholarly journals Measurement and Comparison of Indoor Radon Levels in New and Old Buildings in the City of Muzaffarabad(Azad Kashmir), Pakistan:a Pilot Study

RADIOISOTOPES ◽  
2009 ◽  
Vol 58 (11) ◽  
pp. 749-760 ◽  
Author(s):  
Muhammad RAFIQUE ◽  
Saeed ur RAHMAN ◽  
Shahida JABEEN ◽  
Muhammad Ikram SHAHZAD ◽  
Said RAHMAN ◽  
...  
Keyword(s):  
Pilot Study ◽  
Indoor Radon ◽  
Azad Kashmir ◽  
The City

scholarly journals Basement Mapping of the Fucino Basin in Central Italy by ITRESC Modeling of Gravity Data

Geosciences ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 398
Author(s):  
Federico Cella ◽  
Rosa Nappi ◽  
Valeria Paoletti ◽  
Giovanni Florio
Keyword(s):  
Seismic Activity ◽  
Site Response ◽  
Gravity Data ◽  
A Priori ◽  
Central Italy ◽  
Gravity Anomalies ◽  
Gravity Modeling ◽  
Ground Shaking ◽  
Sedimentary Evolution ◽  
Fucino Basin

Sediments infilling in intermontane basins in areas with high seismic activity can strongly affect ground-shaking phenomena at the surface. Estimates of thickness and density distribution within these basin infills are crucial for ground motion amplification analysis, especially where demographic growth in human settlements has implied increasing seismic risk. We employed a 3D gravity modeling technique (ITerative RESCaling—ITRESC) to investigate the Fucino Basin (Apennines, central Italy), a half-graben basin in which intense seismic activity has recently occurred. For the first time in this region, a 3D model of the Meso-Cenozoic carbonate basement morphology was retrieved through the inversion of gravity data. Taking advantage of the ITRESC technique, (1) we were able to (1) perform an integration of geophysical and geological data constraints and (2) determine a density contrast function through a data-driven process. Thus, we avoided assuming a priori information. Finally, we provided a model that honored the gravity anomalies field by integrating many different kinds of depth constraints. Our results confirmed evidence from previous studies concerning the overall shape of the basin; however, we also highlighted several local discrepancies, such as: (a) the position of several fault lines, (b) the position of the main depocenter, and (c) the isopach map. We also pointed out the existence of a new, unknown fault, and of new features concerning known faults. All of these elements provided useful contributions to the study of the tectono-sedimentary evolution of the basin, as well as key information for assessing the local site-response effects, in terms of seismic hazards.

scholarly journals Preliminary results of ground-motion characteristics

2012 ◽  
Vol 55 (4) ◽  
Author(s):  
Francesca Bozzoni ◽  
Carlo Giovanni Lai ◽  
Laura Scandella
Keyword(s):  
Ground Motion ◽  
Site Response ◽  
Response Spectrum ◽  
Field Tests ◽  
Response Spectra ◽  
Ground Acceleration ◽  
Preliminary Results ◽  
Emilia Earthquake ◽  
Particle Orbit ◽  
2012 Emilia Earthquake

The preliminary results are presented herein for the engineering applications of the characteristics of the ground motion induced by the May 20, 2012, Emilia earthquake. Shake maps are computed to provide estimates of the spatial distribution of the induced ground motion. The signals recorded at the Mirandola (MRN) station, the closest to the epicenter, have been processed to obtain acceleration, velocity and displacement response spectra. Ground-motion parameters from the MRN recordings are compared with the corresponding estimates from recent ground-motion prediction equations, and with the spectra prescribed by the current Italian Building Code for different return periods. The records from the MRN station are used to plot the particle orbit (hodogram) described by the waveform. The availability of results from geotechnical field tests that were performed at a few sites in the Municipality of Mirandola prior to this earthquake of May 2012 has allowed preliminary assessment of the ground response. The amplification effects at Mirandola are estimated using fully stochastic site-response analyses. The seismic input comprises seven actual records that are compatible with the Italian code-based spectrum that refers to a 475-year return period. The computed acceleration response spectrum and the associated dispersion are compared to the spectra calculated from the recordings of the MRN station. Good agreement is obtained for periods up to 1 s, especially for the peak ground acceleration. For the other periods, the spectral acceleration of the MRN recordings exceeds that of the computed spectra.<br />

Sign in / Sign up

Export Citation Format

Share Document