Correlation between type of ground-based on b-value and the impact on buildings due to Sumatra earthquakes

Abstract

The destructive earthquakes occurred in Sumatra are dominated by medium earthquakes, which generally come from the Sumatra fault and to have a direct impact on the land, buildings and around residential buildings. These earthquakes can be classified into high-frequency earthquakes with low-vibration periods. The hazards caused by the earthquake are mostly from damage and collapse of the residential buildings. This study is a literature review that aimed to observe the characteristics of rocks and ground in Sumatra areas based on b-value that obtained using seismicity estimation is related to the resistance of the earthquake on residential buildings. The b-values obtained from some previous researches so that they could be concluded, and then analyzed the type and condition of the local ground and then evaluated its effect on the surrounding buildings. Based on the outcomes, the estimation of b-value seismic parameters in Sumatra was found 0.34 to 0.5. It means that the type of ground in areas of Sumatra has a hard rock layer. Physically, it has highfrequency earthquake waves; low vibration periods, spreading efficiently on hard layer and having a direct impact on local buildings consequently the risk of collapse building will be higher.

Kinerja Seismik Struktur Pascagempa

“…Indonesia merupakan wilayah dengan tingkat ancaman kegempaan yang tinggi, karena berada pada batas pertemuan lempeng besar dunia yang terus bergerak dan saling bertumbukan satu sama lain [1]. Beberapa peristiwa gempa besar yang mengakibatkan keruntuhan bangunan adalah Gempa Aceh (2004), Gempa Jogja (2006) dan Gempa Padang (2009) [2].…”

Analisa Jalur Evakuasi Tsunami di Area Wisata Pantai Panjang Kota Bengkulu

“…Gempa yang melanda daerah Sumatera umumnya diakibatkan karena pengaruh tiga lempeng dunia yang dekat dengan Sumatera [1] [2]. Lebih dari 172 kejadian tsunami telah melanda wilayah Indonesia,termasukdi wilayah pesisir Sumatera [3].…”

Sinergisitas Unsur Masyarakat dan Pemerintah Lokal Dikelurahan Air Tawar Barat Kota Padang Sebagai upaya Peningkatan Kapasitas Warga Menghadapi Ancaman Bencana Gempa dan Tsunami

“…Kota Padang Sumatera Barat termasuk salah satu daerah yang rentan bencana [1], termasuk ancaman gempa-tsunami karena letaknya yang langsung dipengaruhi oleh lempeng Eurasia dan Indo-Australia yang terus bergerak membentuk zona subduksi [2]. Zona subduksi inilah yang selama ini menjadi sumber gempa besar di Sumatera Barat, seperti yang ditampilkan oleh Gambar 1 [3]. Beberapa kejadian gempa yang diikuti tsunami yang pernah terjadi di sekitar wilayah Kota Padang adalah; tsunami Banggai (2000), tsunami Aceh tahun 2004 [4], tsunami Bengkulu (2007), dan tsunami Mentawai (2010).…”