scholarly journals Seismic Hazard Microzonation of Bengkulu City, Indonesia

2020 ◽  
Author(s):  
Lindung Zalbuin Mase ◽  
Nanang Sugianto ◽  
Refrizon Refrizon
Keyword(s):  
Seismic Hazard ◽  
Earthquake Hazard ◽  
Spectral Ratio ◽  
Site Class ◽  
Hazard Reduction ◽  
Seismic Hazard Mitigation ◽  
Shear Wave Velocity Profile ◽  
Inversion Analysis ◽  
Site Classes ◽  
Spatial Plan

Abstract It has been known that Bengkulu City (Indonesia) is vulnerable to undergo seismic damage. This study is initiated by measuring horizontal to vertical spectral ratio (H/V) to sites in Bengkulu City using microtremor. The inversion analysis is performed to generate shear wave velocity profile. A total of 218 sites is investigated in this study. The results show that observed H/V is consistent with the theoretical H/V. National Earthquake Hazard Reduction Program (NEHRP) code is adopted to classify the site class. The results also exhibit that Bengkulu City is dominated by Site Classes C and D. In general, this study could lead local government to reconsider seismic hazard mitigation for spatial plan.

scholarly journals Seismic Hazard Microzonation of Bengkulu City, Indonesia

2020 ◽  
Author(s):  
Lindung Zalbuin Mase ◽  
Nanang Sugianto ◽  
Refrizon Refrizon
Keyword(s):  
Seismic Hazard ◽  
Earthquake Hazard ◽  
Spectral Ratio ◽  
Program Code ◽  
Site Class ◽  
Seismic Hazard Mitigation ◽  
Shear Wave Velocity Profile ◽  
Inversion Analysis ◽  
Site Classes ◽  
Spatial Plan

Abstract It has been known that Bengkulu City (Indonesia) is vulnerable to undergo seismic damage. This study is initiated by measuring horizontal to vertical spectral ratio (H/V) to sites in Bengkulu City using microtremor. The inversion analysis is performed to generate shear wave velocity profile. Hundreds of sites are investigated in this study. The results show that observed H/V is consistent with the theoretical H/V. National Earthquake Hazard Reduction Program code is adopted to classify the site class. The results also exhibit that Bengkulu City is dominated by Site Classes C and D. In general, this study could lead local government to reconsider seismic hazard mitigation for spatial plan.

scholarly journals Seismic hazard microzonation of Bengkulu City, Indonesia

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Lindung Zalbuin Mase ◽  
Nanang Sugianto ◽  
Refrizon
Keyword(s):  
Seismic Hazard ◽  
Earthquake Hazard ◽  
Spectral Ratio ◽  
Program Code ◽  
Site Class ◽  
Seismic Hazard Mitigation ◽  
Shear Wave Velocity Profile ◽  
Inversion Analysis ◽  
Site Classes ◽  
Spatial Plan

AbstractIt has been known that Bengkulu City (Indonesia) is vulnerable to undergo seismic damage. This study is initiated by measuring horizontal to vertical spectral ratio (H/V) to sites in Bengkulu City using microtremor. The inversion analysis is performed to generate shear wave velocity profile. Hundreds of sites are investigated in this study. The results show that observed H/V is consistent with the theoretical H/V. National Earthquake Hazard Reduction Program code is adopted to classify the site class. The results also exhibit that Bengkulu City is dominated by Site Classes C and D. In general, this study could lead local government to consider seismic hazard mitigation for spatial plan.

New Site Coefficients and Site Classification System Used in Recent Building Seismic Code Provisions

2000 ◽  
Vol 16 (1) ◽  
pp. 41-67 ◽  
Author(s):  
R. Dobry ◽  
R. D. Borcherdt ◽  
C. B. Crouse ◽  
I. M. Idriss ◽  
W. B. Joyner ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Classification System ◽  
Site Amplification ◽  
Site Classification ◽  
Site Class ◽  
Site Classes ◽  
Code Provisions

Recent code provisions for buildings and other structures (1994 and 1997 NEHRP Provisions, 1997 UBC) have adopted new site amplification factors and a new procedure for site classification. Two amplitude-dependent site amplification factors are specified: Fa for short periods and Fv for longer periods. Previous codes included only a long period factor S and did not provide for a short period amplification factor. The new site classification system is based on definitions of five site classes in terms of a representative average shear wave velocity to a depth of 30 m (V¯s). This definition permits sites to be classified unambiguously. When the shear wave velocity is not available, other soil properties such as standard penetration resistance or undrained shear strength can be used. The new site classes denoted by letters A - E, replace site classes in previous codes denoted by S1 - S4. Site classes A and B correspond to hard rock and rock, Site Class C corresponds to soft rock and very stiff / very dense soil, and Site Classes D and E correspond to stiff soil and soft soil. A sixth site class, F, is defined for soils requiring site-specific evaluations. Both Fa and Fv are functions of the site class, and also of the level of seismic hazard on rock, defined by parameters such as Aa and Av ( 1994 NEHRP Provisions), Ss and Sl ( 1997 NEHRP Provisions) or Z ( 1997 UBC). The values of Fa and Fv decrease as the seismic hazard on rock increases due to soil nonlinearity. The greatest impact of the new factors Fa and Fv as compared with the old S factors occurs in areas of low-to-medium seismic hazard. This paper summarizes the new site provisions, explains the basis for them, and discusses ongoing studies of site amplification in recent earthquakes that may influence future code developments.

scholarly journals A progress report on
 the Earthquake Hazard Centre

1999 ◽  
Vol 32 (4) ◽  
pp. 257-259
Author(s):  
Andrew Charleson
Keyword(s):  
Developing Countries ◽  
Seismic Hazard ◽  
Seismic Design ◽  
Future Development ◽  
Earthquake Hazard ◽  
Developed Countries ◽  
Progress Report ◽  
Financial Report ◽  
Hazard Reduction ◽  
Design And Construction

This report outlines the current progress of the Earthquake Hazard Centre, a seismic hazard reduction resource centre for developing Commonwealth countries which was established some two and a half years ago. The Centre aims to encourage developing countries to adopt basic building seismic design and construction practices that are taken for granted in more developed countries. After backgrounding the context in which the Centre was initiated, the report describes the Centre's networks and its primary publication, the quarterly newsletter. A financial report is included, and finally, possibilities for future development are suggested.

Behavior of Building Occupants in Earthquakes

1985 ◽  
Vol 1 (2) ◽  
pp. 271-283 ◽  
Author(s):  
Michael E. Durkin
Keyword(s):  
Seismic Performance ◽  
Earthquake Hazard ◽  
Research Area ◽  
Hazard Reduction ◽  
Realistic Appraisal

To be truly effective, earthquake hazard reduction measures must be based on a realistic appraisal of occupants' capabilities and actions during earthquakes. Studies suggest that many overly general beliefs about appropriate response can endanger rather than protect building occupants. We need to analyze occupant actions with respect to hazards posed by the seismic performance of specific building types. This paper will review the findings of recent U.S. studies, discuss the applicability of research from abroad, and summarize requirements for continued progress in this vital research area.

scholarly journals Seismic hazard assessment of Iran

1999 ◽  
Vol 42 (6) ◽  
Author(s):  
B. Tavakoli ◽  
M. Ghafory-Ashtiany
Keyword(s):  
Seismic Hazard ◽  
Peak Ground Acceleration ◽  
Grid Point ◽  
Seismic Hazard Assessment ◽  
Earthquake Hazard ◽  
Seismic Source ◽  
Historical Earthquakes ◽  
Earthquake Insurance ◽  
Ground Acceleration ◽  
Seismic Source Models

The development of the new seismic hazard map of Iran is based on probabilistic seismic hazard computation using the historical earthquakes data, geology, tectonics, fault activity and seismic source models in Iran. These maps have been prepared to indicate the earthquake hazard of Iran in the form of iso-acceleration contour lines, and seismic hazard zoning, by using current probabilistic procedures. They display the probabilistic estimates of Peak Ground Acceleration (PGA) for the return periods of 75 and 475 years. The maps have been divided into intervals of 0.25 degrees in both latitudinal and longitudinal directions to calculate the peak ground acceleration values at each grid point and draw the seismic hazard curves. The results presented in this study will provide the basis for the preparation of seismic risk maps, the estimation of earthquake insurance premiums, and the preliminary site evaluation of critical facilities.

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