Characteristics of Paleotsunami Sediments, A Case Study in Cilacap and Pangandaran Coastal Areas, Jawa, Indonesia

  • Yudhicara Y
  • Zaim Y
  • Rizal Y
  • et al.
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Abstract

A paleotsunami study having been conducted in 2011 took two study cases in Cilacap and Pangandaran coastal areas. These two regions have been devastated by tsunami in the past and had the most severe dam-aged on 17 July 2006. Trenching, beach profiling, and sediment sampling had been carried out, and further analysis at the laboratory had been done, such as grain size and fossil analyses and dating. In Cilacap, an iron sand layer was found as a key bed suspected as a paleotsunami deposits due to the content of anthro-pogenic fragments. In Pangandaran, two layers of tsunami deposit candidates were found having thickness of 5 -6 cm at the top as a 2006 tsunami deposit candidate, and 5 -10 cm at the bottom as a paleotsunami deposit candidate. Both grain size and fossil analysis results could explain that Pangandaran's sediments are tsunami deposits while Cilacap's ones are assumed to be deposited by another process rather than a tsunami. Abstrak Pada tahun 2011 telah dilakukan studi paleotsunami dengan studi kasus di dua tempat, yaitu di wilayah pantai Cilacap dan Pangandaran. Kedua tempat ini memiliki sejarah pernah mengalami tsunami dan mengalami kerusakan paling parah saat terlanda tsunami pada tanggal 17 Juli 2006. Pekerjaan lapangan seperti pembuatan paritan dan penampang pantai serta pengambilan percontoh sedimen telah dilakukan. Analisis lebih jauh di laboratorium seperti analisis besar butir dan identifikasi fosil telah dilaksanakan. Dari Cilacap, ditemukan lapisan pasir besi sebagai lapisan kunci yang dicurigai sebagai endapan tsunami karena mengandung fragmen antropogenik. Sementara di Pangandaran, ditemukan dua lapisan sedimen yang dianggap sebagai endapan tsunami dengan ketebalan 5 -6 cm di bagian atas sebagai endapan tsu-nami 2006, dan endapan paleotsunami di bagian bawah dengan ketebalan 5 -10 cm. Hasil analisis besar butir dan fosil menunjukkan bahwa singkapan sedimen yang ditemukan di Pangandaran adalah endapan tsunami, sedangkan singkapan sedimen yang ditemukan di Cilacap bukan endapan tsunami melainkan endapan proses lainnya. Kata kunci: sedimen pantai, endapan tsunami, paleotsunami, besar butir, analisis fosil

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Yudhicara, Y., Zaim, Y., Rizal, Y., Aswan, A., Triyono, R., Setiyono, U., & Hartanto, D. (2013). Characteristics of Paleotsunami Sediments, A Case Study in Cilacap and Pangandaran Coastal Areas, Jawa, Indonesia. Indonesian Journal on Geoscience, 8(4). https://doi.org/10.17014/ijog.v8i4.166

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