Abstract
As an important step in effectively reducing seismic risk and the vulnerability of the city of Mobarakeh to earthquakes, a site effect microzonation Study was conducted. Seismic hazard analysis for a return period of 475 years was carried out. Data from 10 borings was collected and analyzed, geophysical surveys were conducted and seismology and geoelectric measurements taken in more than 17 stations through out the city. The study area was divided into a grid of 500×500 m2 elements and the sub-surface ground conditions were classified into 5 representative geotechnical profiles. Electric resistivity was measured in close to 17 geotechnical boreholes and surface and sub-surface sediments were collected and analyzed. Site response analyses were carried out on each representative profile using 30 different base rock input motions. Distribution maps of site periods and peak ground acceleration and old and new texture buildings through out the city were developed, providing a useful basis for land-use planning in the city.
Highlights
Ground shaking and its associated damage to engineered structures can be strongly influenced, by source and path effects, and by surface and sub-surface geological and geomorphologic conditions in the vicinity, known as “local site effects”
This paper presents the major results obtained during the site effect microzonation study
This paper presents the most important features of soil and quality and site effect microzonation studies of Mobarakeh
Summary
Ground shaking and its associated damage to engineered structures can be strongly influenced, by source and path effects, and by surface and sub-surface geological (depth and type of bedrock, underground sediments) and geomorphologic conditions in the vicinity, known as “local site effects”. Evidence of this can be found in two major seismic events in Iran in the past two decades—1990 Manjil-Rudbar and the 2003 Bam earthquakes—that resulted in a large number of casualties These cities had comparatively low populations, the lack of suitable development and earth quake risk management led to high human and physical costs [1]. In previous studies [1,2] carried out a soil and sediment quality microzonation study of Bam city from seismic hazard point of view They estimated the horizontal peak acceleration for basement rock with out considering soil types, based on the tectonics and seismicity of the Kerman province using the Cornell approach. This paper presents the major results obtained during the site effect microzonation study
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