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Study Area and MethodologyBangalore12 o 58’N; 77 o 36’EScale 1:5,00,000Greenstone and allied supracrustal beltGneissic Complex / Gnesis GranuliteTerrestrial facies cover in linear grabenAlluvial fill in pericratonic riftComposite Batholithic ComplexAlkaline Plutonic ComplexShelf facies cover intracratonic sagFigure 2.2: Tectonic/Geologic map around Bangalore/study area.Epiric sea / marginal overlap cover7
Study Area and MethodologyFigure 2.3: Active faults present close to Bangalore (after Valdiya, 1998)Bangalore city lies over a hard and moderately dense Gneissic basement dated back to the Archean era (2500-3500 mya). A large granitic intrusion in the south central part of the city extends from the Golf Course in thenorth central to Vasantpur (VV Nagar) in the south of the city (almost 13 km in length) and on an average 4 kmfrom east to west along the way. A migmatite intrusion formed within the granitic one extends forapproximately 7.3 kms running parallel with Krishna Rajendra Road/ Kanakpura Road from Puttanna ChettyRoad in Chamrajpet till Bikaspura Road in the south. A 2.25km Quatrzite formation is found in Jahahalli East.Dike swarms are seen around the western outskirts of the city (west of the Outer Ring Road), most of themstriking approximately N15 o E. However random east west trending ones are also seen. They appear to strikeparallel to the strike of the vertical foliation of the country rock at that area. These basic intrusive which markthe close of the Archean era (Lower Proterozoic; 1600-2500 mya) <strong>main</strong>ly constitute of hard massive rocks suchas Gabbro, Dolerite, Norite and Pyroxenite.2.2.4 Geomorphology of the Seismic Study AreaBangalore city lies within the South Pennar Basin. There are over 150 freshwater lakes within the city which arelinked to one another dendritically. The Vrishabhavathi, a minor tributary of the Arkavati enters the city almostdiagonally from the Southwest (Kengeri). On entering, it branches off giving rise to the Nagarbhavi Thorai atthe intersection of the Mysore Road and the Bangalore University Road. The river Arkavati branches north fromCauvery, most probably due to some structural control imposed by presently active faults and other North southtrending lineaments in its course. The river Ponnaiyar enters the city from the south east and branches into two,one stream terminates in the Bellandur Lake, where as the other continues northwestwards.Bangalore city is subject to a moderate annual soil erosion rate of 10 Mg/ha. The basic geomorphology of thecity comprises of a central Denudational Plateau and Pediment (towards the west) with flat valleys that areformed by the present drainage patterns (See Figure 2.5). The central Denudational Plateau is almost void of anytopology and the erosion and transportation of sediments carried out by the drainage network gives rise to thelateritic clayey alluvium seen throughout the central area of the city. The Pediment/Pediplain is a low relief areathat abruptly joins the plateau. The area might have uplifted along active lineaments and been eroded by theriver Arkavati and its sub tributaries. The resulting alluvial fan deposits have been deposited or transportedalong the waterways.8
Page 2 and 3: Front cover page figure description
Page 5: III
Page 8 and 9: EXECUTIVE SUMMARYSeismic hazard and
Page 10 and 11: CONTENTS3.14.5 Hazard Curves 533.15
Page 12 and 13: CHAPTER 1INTRODUCTION AND BACKGROUN
Page 14 and 15: Introduction and Background Informa
Page 16 and 17: Study Area and MethodologyBangalore
Page 20 and 21: Study Area and Methodology17° 30'M
Page 22 and 23: Study Area and Methodology1:100,000
Page 24 and 25: Study Area and MethodologySource 1S
Page 26 and 27: Study Area and MethodologyArea sele
Page 28 and 29: Study Area and MethodologySite Resp
Page 30 and 31: CHAPTER 3SEISMIC HAZARD ANALYSIS3.1
Page 32 and 33: Deterministic Seismic Hazard Analys
Page 34: Deterministic Seismic Hazard Analys
Page 38: Deterministic Seismic Hazard Analys
Page 51 and 52: Probabilistic Seismic Hazard Analys
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CHAPTER 4SITE CHARACTERIZATION USIN
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Site Characterization using Geotech
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Site characterization using Multich
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Local site effects and Site Respons
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400m 200 0 80016002 cm to 400m2400
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CHAPTER 6LIQUEFACTION HAZARD ASSESS
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Liquefaction Hazard Assessment6.3.2
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Liquefaction Hazard Assessmentmore
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Liquefaction Hazard AssessmentBorel
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Liquefaction Hazard AssessmentBORE
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Liquefaction Hazard AssessmentBORE
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Liquefaction Hazard Assessment4030D
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Integration of hazard maps on GIS P
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Summary and Conclusions3. Computer
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Summary and Conclusions8.8 INTEGRAT
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REFERENCESAki, K. (1969), “Analys
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ReferencesFinn, W. D. Liam (1991),
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ReferencesMcHarg (1968)Miller, R.D.
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ReferencesShankar, D and Sharma, M.
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