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Titi Anggono

Unknown Affiliation

Author-ID : 453214

Astronomy Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics

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Penentuan Percepatan Tanah Puncak di Pulau Simeulue dengan Metode Deterministik Lina Handayani; Nugroho D. Hananto; Titi Anggono; Syuhada Syuhada; Karit L. Gaol; Sonny Aribowo
Jurnal Lingkungan dan Bencana Geologi Vol 8, No 3 (2017)
Publisher : Badan Geologi

ABSTRAKPulau Simeulue terletak di busur muka subduksi Sumatra bagian utara yang merupakan pulau dengan tingkat bahayakegempaan sangat tinggi. Catatan sejarah kegempaan menunjukkan bahwa pulau ini merupakan daerah dengan bahayagempa bumi dan tsunami. Bahaya gempa bumi telah disadari oleh penduduk Pulau Simeulue. Walaupun seluruhpenduduk telah mengetahui adanya potensi bahaya gempa bumi, diperlukan peta daerah bahaya gempa bumi yanglebih terperinci. Peta bahaya gempa bumi ini diperlukan sebagai panduan dalam pengembangan infrastruktur di pulauini. Analisis bahaya gempa bumi dengan metode deterministik dilakukan untuk menyusun peta mikrozonasi bahayagempa bumi Simeulue. Metode ini dipilih berdasarkan kajian dan analisis tektonik dan kegempaan di Simeulue sertadata geologi dan geofisika lainnya. Hasil analisis yang berupa nilai percepatan tanah puncak menunjukkan tingkatbahaya kegempaaan secara keseluruhan di Pulau Simeulue yang sangat tinggi, dengan nilai percepatan 0,7 hingga1,3g. Daerah dengan kemungkinan bahaya tertinggi terletak di daerah pesisir barat laut dan terendah terletak di bagiantenggara Pulau Simeulue.Kata kunci: deterministik, gempa bumi, Pulau Simeulue, percepatan tanah puncakABSTRACTSimeulue Island, located at the forearc region of Sumatra subduction zone, is an island with high seismic hazard.History records show the past disasters caused by great earthquakes and tsunamis. People of Simeulue has alreadyknown the threat of the possible earthquakes and tsunamis. However, better knowledge of detailed microzonation isneeded as a guide for future development of the island. Deterministic seismic hazard analysis was selected for hazardmicrozonation of the island. The analysis was based on the geological and geophysical data. The result of the analysisindicated a high value of peak ground acceleration (PGA) for the whole area of the island. The highest accelerationoccurred along the southwest coast and the lowest occurred at the southeast end part of the Simeulue Island.Keywords: deterministic seismic hazard analysis, earthquake, Simeulue Island, peak ground acceleration

DEFORMASI KOMPLEKS DI PULAU SIMEULUE, SUMATRA: INTERAKSI ANTARA STRUKTUR DAN DIAPIRISME Sonny Aribowo; Lina Handayani; Nugroho D. Hananto; Karit L. Gaol; Syuhada Syuhada; Titi Anggono
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 24, No 2 (2014)
Publisher : Indonesian Institute of Sciences

The accretionary prism complex has unique morphological characteristic as a result of deformation and sedimentation processes that develop in the area. Simeulue Island is one example of the islands in the accretionary complex. Geological study was arranged to map geological structure and morphology of Simeulue Island by satellite images interpretation and field survey. We use Landsat TM 5, Landsat 8 and Aster-GDEM imageries for morphology and structural geology interpretation. The collision in the deformation front has generally developed reverse and thrust faults in the Simeulue Island. The north-northeast blocks tend to be higher than the south-southwest blocks. Based on imagery interpretation, the dominant thrusts are the trenchward-vergence thrusts. Measurement of structural features and folds reconstruction indicated the existence of the out-of-sequence thrusts, which might activated the arcward-vergence thrust. This arcward-vergence thrust could be interpreted as a backthrust fault of a backstop mechanism in the inner accretionary prism. The thrusts might be correlated to the mud diapirisms that were also found in some locations in the island. The finding of thrusts and mud diapirism traces concurred to the theory that the mélange complexes in subduction zones were formed through mud diapirism that facilitated by backthrust faults.ABSTRAKKompleks prisma akresi memiliki karakteristik morfologi yang unik sebagai hasil dari proses deformasi dan sedimentasi yang berkembang di daerah tersebut. Pulau Simeulue merupakan salah satu contoh pulau yang terbentuk pada prisma akresi. Studi geologi dilakukan untuk menggambarkan keadaan struktur geologi yang terbentuk di Pulau Simeulue yang berhubungan dengan mekanisme pembentukan sesar-sesar anjak pada prisma akresi, pembentukan kompleks batuan bancuh dan mekanisme kubah lumpur. Morfologi dan struktur geologi Pulau Simeulue dipetakan melalui interpretasi citra dan survey lapangan. Citra yang digunakan dalam studi ini adalah citra Landsat TM5, Landsat 8 dan Aster-GDEM. Tumbukan di bagian muka deformasi mengakibatkan berkembangnya struktur berupa sesar-sesar naik dan anjak dimana di bagian utara-timurlaut cenderung lebih naik daripada bagian selatan-baratdaya. Berdasarkan hasil interpretasi citra, sesar-sesar yang berkembang tersebut umumnya merupakan sesar-sesar anjak berarah palung (trenchward-vergence thrusts). Berdasarkan hasil pengukuran fitur struktur di lapangan dan rekonstruksi lipatan di Pulau Simeulue, perkembangan struktur anjak juga terjadi secara out-of-sequence yang mengakibat-kan teraktifkannya sesar anjak berarah busur (arcward-vergence thrusts). Sesar anjak berarah palung dapat diinterpretasikan sebagai backthrust fault dari sebuah mekanisme backstop di bagian belakang prisma akresi. Sesar-sesar anjak ini dapat dikaitkan dengan keberadaan kubah lumpur (mud diapir) yang jejaknya juga ditemukan di beberapa lokasi di Pulau Simeulue. Hal-hal tersebut mendukung teori bahwa kompleks batuan mélange di Pulau Simeulue terbentuk melalui proses mud diapirism yang muncul melalui sesar-sesar anjak.

Optimization of Band Pass Filter for Variance Reduction in Determining The Solution of Moment Tensor and Focusing Mechanism with ISOLA-GUI Sequence of The Minahasa Peninsula Earthquake Date 28 September 2018 to 1 October 2018 Titi Anggono; Rio Rinaldo Tarigan; Diana Alemin Barus
Journal of Technomaterial Physics Vol. 3 No. 2 (2021): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v3i2.5558

Sulawesi is one of the islands in Indonesia with a high level of seismicity because there are many active faults, especially in the Minahasa Peninsula area. This study discusses the moment tensor solution and the focus mechanism in the Minahasa Peninsula region from 28 September 2018 to 1 October 2018 using the ISOLA-GUI program. This program is used to process seismic data from the three components recorded by the seismogram. The data used in this study were five earthquake events consisting of earthquake foreshock, earthquake mainshock, and earthquake aftershock. With the ISOLA program, data processing is carried out which includes: crustal models, event info, selecting earthquake recording stations, preparing raw data for defining seismic sources, calculating green functions with computations, performing inversions and plotting results. In the inversion, the frequency of the band pass filter is selected to obtain the optimal reduction variance. After processing, calculating and interpreting the plot results, a fault model is obtained for each earthquake event, namely strike-slip.

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