Kajian Nilai Percepatan Puncak di Daerah Kulon Progo Utara, Yogyakarta, Indonesia, Berbasis Peta Gempa Nasional 2017 dan Pengukuran Mikrotremor

Authors

  • Eddy Hartantyo Program Studi Geofisika, Universitas Gadjah Mada
  • Novia Nurul Khayati Program S2 Fisika, FMIPA, UGM
  • Rusnianti Nur Program S2 Fisika, FMIPA, UGM
  • Skolastika Novita Program S2 Fisika, FMIPA, UGM

DOI:

https://doi.org/10.26418/positron.v10i2.43310

Keywords:

HVSR, Kulon Progo, longsor, PGA

Abstract

Daerah Kulon Progo bagian utara memiliki morfologi perbukitan batuan lapuk dengan banyak kejadian longsor. Terdapat 16 titik wisata di daerah ini, sehingga sangat penting untuk dilakukan kajian resiko bencana longsor. Salah satu data cukup penting dalam perhitungan empiris adalah kajian nilai peak ground acceleration (PGA)/nilai percepatan puncak lokal di permukaan. PGA dihitung menggunakan kombinasi pengukuran mikroseismik dan peta PGA di batuan dasar untuk berbagai skenario deterministik maupun probabilistik. Sebanyak 78 data mikroseismik yang tersebar dengan pusat Desa Gerbosari dan sekitarnya diukur menggunakan Lennartz 1 Hz dengan sampling perekaman 100 Hz selama masing-masing 40-45 menit. Data diproses menggunakan  modul horizontal to vertical spectral ratio (HVSR) di Geopsy. Hasil yang diperoleh menunjukkan bahwa 55% data merupakan clearpeak, 23% clearpeak dengan noise rendah, dan 10% noise sedang. Amplitudo amplifikasi diperoleh hingga 5 kali, terutama di sisi tenggara dan barat Desa Gerbosari. Pada daerah dengan amplifikasi tinggi tersebut diperoleh nilai PGA untuk skenario P01, P07 dan P10 masing-masing sebesar 0,8 g, 3,8 g dan minimal 5 g. Daerah dengan nilai PGA dan amplifikasi tinggi bersesuaian dengan   lokasi-lokasi yang dilaporkan terjadi longsor yang dipicu oleh jenuhnya air, kemiringan lereng, dan amplifikasi goncangan, terutama yang berdekatan dengan jalan raya.

Author Biography

Eddy Hartantyo, Program Studi Geofisika, Universitas Gadjah Mada

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Published

2020-12-29

Issue

Vol. 10 No. 2 (2020): Vol. 10 No. 2 Edition

Section

Articles

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