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Abstract

A strong earthquake of 8.4 Mw occurred at the Sumatra Subduction Zone in September 12, 2007. The area that underwent the impact of the earthquake was located along the coastal area of the Bengkulu Province. A seismic ground response study was then performed with reference to the event. Several site investigations, including standard penetration test and shear wave velocity tests, were conducted to understand the subsoil condition. The data were used to analyze a ground response during the earthquake. The amplification factor of each site was obtained, and a comparison of the spectral accelerations was performed. The results showed that the study area could undergo an amplification factor ranging from 1.1 to 1.5 during the seismic wave propagation. The spectral acceleration that resulted from the seismic response analysis was also within the design value. The study results could generally bring awareness to local engineers to consider the seismic design value for the coastal area of the Bengkulu Province, particularly if a stronger earthquake happens in the future.

Bahasa Abstract

Analisis Respon Seismik di Sepanjang Area Pesisir Bengkulu selama Gempa September 2007. Pada tanggal 12 September 2007, gempa dahsyat berkekuatan 8,4 Mw terjadi di Zona Subduksi Sumatra. Salah satu area yang mengalami dampak dari gempa tersebut adalah pesisir pantai Provinsi Bengkulu. Mengacu pada kejadian tersebut, sebuah studi respon tanah seismik dilakukan. Beberapa investigasi lapangan yang terdiri dari uji SPT dan pengukuran gelombang geser dilakukan untuk memahami kondisi perlapisan tanah. Selanjutnya data yang yang peroleh tersebut digunakan untuk menganalisis respon lapisan tanah selama beban gempa tersebut. Faktor amplifikasi pada setiap lokasi dan perbandingan antara respon spectra dianalisis dalam studi ini. Hasil penelitian menunjukkan bahwa area penelitian dapat mengalami amplifikasi sebesar 1,1 sampai 1,5 kali selama perambatan gelombang seismik. spektra respon yang dihasilkan dari analisis respon seismik juga masih dalam batasan desain yang ditetapkan. Secara umum, hasil studi ini menekankan pada insinyur lokal untuk mempertimbangkan nilai desain yang dihasilkan untuk kawasan pesisir Provinsi Bengkulu, khususnya jika gempa besar terjadi di kemudian hari.

References

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