Advantages of Realistic Model Based on computational method: NDSHA versus Standard PSHA

10th Aceh International Workshop and Expo on Sustainable Tsunami Disaster Recovery

Irwandi, I.^1,2,3

Tsunami and Disaster Mitigation Research Center (TDMRC), Syiah Kuala University, Jl. Prof. Dr. Ibrahim Hasan, Gampong Pie, Banda Aceh

23233, Indonesia^1

Physics Department, Syiah Kuala University, Jl. Syech Abdurrauf, Banda Aceh

23111, Indonesia^2

Geophysics Engineering Department, Syiah Kuala University, Jl. Syech Abdurrauf, Banda Aceh

23111, Indonesia^3

关键词: Attenuation relations;    Linear relationships;    Probability of exceedance;    Propagation modeling;    Seismic hazard assessment;    Strong ground motion;    Synthetic seismogram;    Translation invariants;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/56/1/012007/pdf
DOI  :  10.1088/1755-1315/56/1/012007

来源: IOP

【 摘 要 】

Procedure of standard Seismic Hazard Assessment (PSHA) has a problem with over simplifying recurrence since being represented by a linear relationship. However, the relationship will be satisfied only if the size of the study area is large enough with respect to linear dimensions of sources.. PSHA lies in attenuation relations are usually not translation invariant in the phase space. Regarding the problem of completeness data, instead of using recurrence relationship DSHA select the most credible earthquakes. However, the DSHA remain lies in attenuation relations, assume the same propagation model for all the events, but such a hypothesis is not very realistic. On the contrary, NDSHA procedure has advantages in calculation strong ground motion from the realistic model of synthetic seismograms from source specific properties and cooperates with the available structural model. Additionally, The NDSHA produced more information such as PGD, PGV, PGA for horizontal and vertical components each. Using realistic computation for Banda Aceh, NDSHA provides an accurate value for each of those components, achieving probability of exceedance in the range between 10% to 2% probability of exceedance PGA from PSHA computation. Regarding some limitation from PSHA, Indonesia needs to establish research on NDSHA for the area has critical infrastructures to face the seismic hazard.