PROPOSED SEISMIC HAZARD MAP AND GROUND MOTION ON BEDROCK FOR SEVERAL MAJOR CITIES IN CELEBES BASED ON SEISMIC HAZARD ANALYSIS RESULT USING 3-D SEISMIC SOURCE

• Main Author: RIZA (NIM : 25007036); Tim Pembimbing : Prof. Ir. Masyhur Irsyam, MSCE, Ph.D; Ir. Erza Rism, MUHAMMAD
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/16588
• Institution: Institut Teknologi Bandung

Seismic hazard map is required to present the seismic hazard level for a certain region. The Seismic hazard map for the territory of Indonesia stated in Planning Procedures for Building Earthquake Resistance (SNI 03-1726-2002) is formulated based on probabilistic seismic hazard analysis (probabilistic seismic hazard analysis/PSHA) using two-dimensional seismic source model. The existence of <br /> <br /> seismic events that have significant magnitude after 2000 and the development of software that has the ability to take into account the 3-dimensional seismic sources, demanding the need for review of a map of earthquake acceleration and response spectra design contained in the SNI 03 - 1726-2002. Therefore to meet this demand has been established a team of Indonesian earthquake map revision <br /> <br /> 2010 to provide an overview of the Indonesian earthquake map. Also in general, seismic data in Indonesia, particularly the Sulawesi region covers only the location of epicenter, magnitude, depth, and seismic source mechanism. While the acceleration time history data information on bedrock or called as ground motion on bedrock is still very rare. Whereas in fact ground motion can describe how an earthquake affects a specific location. This is because the ground motion recorded in the form of time histories of displacement, velocity, or acceleration, so the characteristics of ground motion data in the form of amplitude, frequency, and duration can be known. This study contains discussion of methods of seismic hazard maps based on seismic hazard analysis using 3-dimensional model of <br /> <br /> seismic sources and create synthetic ground motion on bedrock which is proposed to several major cities in Celebes which have a history of active seismicity. The study begins with the identification of seismic source made by collecting historical data and information about earthquakes source characteristics. Making models of earthquake source zones based on the results of identifying the source of the earthquake and seismotectonic studies and regional geology. Seismic source zone model used differentiated subduction, shallow crustal, and background. Data processed with statistical methods on historical data to produce seismic events that are independent of data necessary in determining the seismic parameters. This <br /> <br /> processing includes conversion scale of magnitude, the analysis of dependency, as well as analysis of completeness. With 3-dimensional model of earthquake source, PSHA generate value Peak Ground Acceleration (PGA) on bedrock a more accurate basis. PSHA in this study was conducted for 475 year return periods (10% probability in 50 years) and 2475 years (2% probability in 50 years). <br /> <br /> Spectral response on bedrock basis spectra scaled to the period t = 0.2 sec and t = 1.0 seconds to get the target spectra. The results of analysis to produce scale spectra and acceleration time histories on bedrock scale which is proposed as a synthetic ground motion in this study. PSHA results using 3-dimensional seismic source model showed a relatively higher compared to the seismic hazard map of <br /> <br /> Indonesia (SNI 03-1726-2002). PSHA results of this study when compared with seismic hazard map of Indonesia is prepared by a team of Indonesian earthquake map revision 2010 has a different variation on the interval 0.05g to 0.10g while the tendency has accelerated contour pattern indicates the pattern of similarity. In this study, seismic hazard mapping program conducted with the assistance of the <br /> <br /> USGS 2008, while the EZ-FRISK program TM Version of Risk Engineering Inc. 7.37 used to control the PSHA results of the USGS program and used to perform analysis and spectral matching deagregation order to get the form of synthetic <br /> <br /> ground motion is proposed for several major cities in the <br /> <br /> region of Celebes.