by Rizkita Parithusta
(Department of Earth and Planetary Sciences Institute of Seismology and Volcanology — Kyushu University, and Indonesia Center for Earthquake Engineering)
Seminar dan Pameran HAKI 2007 - “KONSTRUKSI TAHAN GEMPA DI INDONESIA”
Abstract
Attenuation relation of the peak horizontal ground accelerations for Indonesia region is developed. The database is compiled for earthquakes with moment magnitudes Mw ≥ 5 that occurs during 1971 – 2007, which consists of horizontal peak ground accelerations and their 5 percent damped response spectra; the accelerograms are recorded on different site conditions classified as rock, hard and soft soils. Earthquake hypocenters with depths up to 150 km are used to attune the equation relevant to subduction, which are the most common earthquake events in Indonesia. The effects of the local site conditions and depth on the attenuation relation are considered simultaneously with the distance and magnitude using a two-stage regression procedure to separate the distance dependence from that of the magnitude.
An iterative partial regression algorithm is proposed to overcome the singularity of the resulting normal equations. It can be observed that the peak ground motions increase with depth for the same magnitude and distance. Considering the soil conditions, it is noticeable that the station coefficients correspond to the soil-type classification varies widely. For the peak ground accelerations, the station coefficients are closely related to the general soil-type classification; while the peak ground velocity have strong relationship with the soil-type classification.
Learn more about Seismic Chart In Performance-Based Earthquake Engineering, you can download here
(Department of Earth and Planetary Sciences Institute of Seismology and Volcanology — Kyushu University, and Indonesia Center for Earthquake Engineering)
Seminar dan Pameran HAKI 2007 - “KONSTRUKSI TAHAN GEMPA DI INDONESIA”
Abstract
Attenuation relation of the peak horizontal ground accelerations for Indonesia region is developed. The database is compiled for earthquakes with moment magnitudes Mw ≥ 5 that occurs during 1971 – 2007, which consists of horizontal peak ground accelerations and their 5 percent damped response spectra; the accelerograms are recorded on different site conditions classified as rock, hard and soft soils. Earthquake hypocenters with depths up to 150 km are used to attune the equation relevant to subduction, which are the most common earthquake events in Indonesia. The effects of the local site conditions and depth on the attenuation relation are considered simultaneously with the distance and magnitude using a two-stage regression procedure to separate the distance dependence from that of the magnitude.
An iterative partial regression algorithm is proposed to overcome the singularity of the resulting normal equations. It can be observed that the peak ground motions increase with depth for the same magnitude and distance. Considering the soil conditions, it is noticeable that the station coefficients correspond to the soil-type classification varies widely. For the peak ground accelerations, the station coefficients are closely related to the general soil-type classification; while the peak ground velocity have strong relationship with the soil-type classification.
Learn more about Seismic Chart In Performance-Based Earthquake Engineering, you can download here
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