Gempa yang terjadi pada tanggal 25 Oktober di Pulau Mentawai merupakan gempa megathrust segmentasi Mentawai-Pagai. Segmentasi megathrus ini memiliki sejarah gempa yang terjadi sebelumnya yaitu pada tahun 1797 dan 1833. Artikel ini akan membahas review paper tentang model gempa megathrust di segmentasi Mentawai-Pagai yang terdiri dari berbagai aspek kajian, seperti: paleogeodetik, seismologi teleseismik, analisis gempa susulan, mikroatol dan refleksi seismik. Model keretakan yang terjadi di segmentasi Mentawai-Pagai ditemukan di kerak samudera. Energi yang dilepaskan dari gempa megathrust hanya sepertiga dari energi yang tersedia. Kemudian studi lebih lanjut diperlukan untuk memantau prediksi tsunami.
The phenomenon of land subsidence in Negeri Sila of Nusalaut Island was caused by an earthquake in Ambon Island and surrounding areas on September 26, 2019 with the magnitude of 6.5. This research had been conducted using a resistivity method with a dipole-dipole configuration. Land subsidence occurred due to seawater intrusion around the area. The earthquake around Ambon Island was the trigger, so soil creep occurred.The purpose of this study is to obtain a weak resistivity zone area that indicates subsidence. The results showed a low resistivity value of 1-10 Ohm meters which indicated a weak zone of potential subsidence of the ground surface, and the presence of sea water intrusion into the area.
Gastropods are the sources of protein for coastal communities in the Maluku islands. We conducted analysis quantitative and qualitative of protein in Nerita undata meat from Hasa Cape in Saparua Island. The percentage of protein was analyzed by the Kjeldahl method. Qualitative analysis began with breaking peptide bonds in protein to amino acid components by sulphuric acid and barium hydroxide hydrolyzed. We identified amino acid compounds by using thin-layer chromatography (TLC) in butanol-acetic acid-water (8:1:1, v/v) as eluent. The result showed that N. undata meat contains 11.15% of protein and twelve amino acid compounds. There are seven essential amino acids in N. undata meat from supralittoral rocks and mezolittoral zone of Hasa cape is a source of quality protein. Thus, this species can be considered as a source of high-quality protein.
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