Analisis Respons Tanah Di Permukaan Pada Beberapa Lokasi Pemboran Dangkal Stasion Gempa Bmkg
DOI:
https://doi.org/10.31815/jp.2017.12.45-57Kata Kunci:
Hazard gempa, respons tanah, spesifik situs, amplifikasi, spectrum responsAbstrak
Analisis hazard gempa untuk wilayah Indonesia sudah disusun dalam peraturan gempa Indonesia (SNI-1726-2012) untuk Peak Ground Acceleration (PGA) dan spektrum respons dibatuan dasar, sedangkan aplikasi untuk disain struktur harus dihitung dipermukaan dengan mempertimbangkanefek tanah lokal. Analisis respon spesifik site dapat dilakukan dengan menggunakan analisis perambatan gelombang dari batuan dasar ke permukaan berdasarkan input parameter tanah dan goyangan di batuan dasar. Pada penelitian ini dilakukan analisis respon spesifik situs pada empat lokasi yang telah diketahui kondisi tanahnya berdasarkan hasil uji pengeboran dan Standard Penetration Test (SPT) yaitu di Serang, Sukabumi, Cilacap, dan Wonogiri yaitu lokasi stasion seismograf milik Badan Meteorologi Klimatologi dan Geofisika (BMKG). Hasil analisis pada seluruh lokasi tersebut diperolehspektrum respons dipermukaan pada perioda 1,0 detik terjadi amplifikasi, sedangkan pada PGA dan spektrum respons 0,2 detik terjadi deamplifikasi. Bila dibandingkan dengan ASCE-07-10 untuk jenis tanah sedang (SD) memperlihatkan nilai amplifikasi hasil penelitian yang lebih rendah. Hal ini tentunya akan menjadi bahan kajian dan evaluasi lebih lanjut untuk kebutuhan praktis.
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