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"Indonesian trading development rapidly shows an improvement with neighbour countries such as Malaysia and Singapore. Even though the transportation infrastructures arround Malacca Straits are currently just provided by boats. For balancing the development trading reasons, Indonesian Government concerns to facilitate the building of transportation infrastructures or a fix-link infrastructure, a crossing bridge between Sumatera island (Indonesia) and Malaysia. Malacca strait Bridge (MSB) between Indonesia and Malaysia is a part of Trans Asia road link, has been planned since years ago. To support the current planning, the research and development Agency - Ministry of Public Works-Republic of Indonesia (Badan Penelitian dan Pengembangan, Kementrian Pekerjaan Umum, Indonesia) needs to make a reviewing on a pre-feasibility study (Pre FS) for MSB. Pre FS activity involved many disciplines of knowledge especially for road/corridor, transportation, bridge, geotechnical, , sea shore, environment, and social-economic-culture-policy. Pre FS result results that break event point for Corridor I among Dumai-P. Rupat-P. Medang Malaysia may be expected between 25 and 30 years based on Benefit Cost Ratio methode, using cable stayed and suspension bridges and girders. The longest span for cable stayed and suspension bridges are 2600 m and 1280 m. respectively. The selected corridior must be intensively discussed about technology absorbed and safety factor, resources capability for maintenance , integration within toll road network, fundation technology in the sea, and users psychology and comfort. Consession for operator may apply for 30 to 40 years."

"Malacca Strait, as one of the strategic straits in world trade, often face various nontraditional security threats. In accordance with United Nations Convention on the Law of The Sea (UNCLOS), littoral states such as Indonesia, Singapore, and Malaysia are obligated to maintain the security in Malacca Straits, to ensure that world trades and world economic are not disrupted. This study analyzes how the Malacca straits patrol (MSP) framework is formed by littoral states in order to maintain the security stability in Malacca Strait. The authors employ qualitative method through literature study. The obtained data were analyzed using the theory of defense cooperation and concept of defense diplomacy. The results of the study conclude that MSP, which is consisted of the Malacca Straits Sea Patrol (MSSP), "Eyes-in-the-Sky" Combined Maritime Air Patrols (EiS), and the MSP Intelligence Exchange Group (IEG), is classified as a defense diplomacy activity in the form of multilateral contacts between military officials and multilateral military exercises aimed at increasing mutual trust and defense capabilities of each country."

"Selat Sunda terletak diantara dua struktur subduksi yang berbeda yaitu subduksi miring pada bagian barat daya Sumatera serta subduksi normal pada bagian se- latan Jawa. Selat Sunda dan sekitarnya juga dilalui oleh jalur cincin gunung api aktif. Hal tersebut membuat keberagaman struktur geologi serta vulkanik di bawah selat sunda dan sekitarnya menjadi penting untuk dipahami untuk meningkatkan kewaspadaan terhadap kejadian gempa di masa mendatang. Pada penelitian kali ini digunakan tomogra kecepatan seismik 3D untuk mencitrakan bawah permukaan Pada wilayah barat Jawa, khususnya pada Selat Sunda hingga kedalaman 150 km. Data waktu tempuh gelombang P dan S dari periode April 2009 hingga Desember 2021 sejumlah 1418 event gempa dengan minimal 15 fase dengan magnitudo M >3 digunakan untuk mendapatkan citra tomogram Vp, Vs, dan Vp/Vs. Proses inversi dan relokasi hiposenter dilakukan menggunakan SIMULPS12 dengan algoritma to- mogra waktu tempuh. Tomogra waktu tempuh berhasil mencitrakan perubahan kecepatan yang signi kan pada struktur geologi yang berpotensi menjadi sumber gempa seperti lempeng subduksi, struktur vulkanik, serta zona seismogenic lain- nya. Pelelehan sebagian (partial melting) pada bawah Gunung Sekincau, Krakatau, Prakasak, serta kompleks Gunung Salak dan Guntur berhasil tercitrakan dengan anomali kecepatan P dan S yang rendah serta nilai rasio Vp/Vs yang tinggi. Lem- peng subduksi Indo-Australia dengan Eurasia juga terlihat sebagai anomali peruba- han kecepatan P dan S yang tinggi.

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The Sunda Strait is located between two different subduction structures: oblique subduction in southwestern Sumatra and normal subduction in southern Java. The Sunda Strait and surrounding areas are also traversed by an active volcanic ring. This makes the diversity of geological and volcanic structures under the Sunda Strait and surrounding areas important to understand to increase awareness of fu- ture earthquake events. In this study, 3D seismic velocity tomography is used to image the subsurface in the western region of Java, especially in the Sunda Strait to a depth of 150 km. P and S wave travel time data from April 2009 to December 2021 totaling 1418 earthquake events with at least 15 phases with magnitudes of M >3 are used to obtain Vp, Vs, and Vp/Vs tomogram images. The inversion process and hypocenter relocation were performed using SIMULPS12 with the traveltime tomography algorithm. Travel-time tomography successfully imaged signi cant ve- locity changes in geological structures that are potential earthquake sources such as subduction plates, volcanic structures, and other seismogenic zones. Partial melt- ing beneath Mount Sekincau, Krakatau, Prakasak, and the Mount Salak and Guntur complexes was successfully imaged with low P and S velocity anomalies and high Vp/Vs ratio values. The Indo-Australian subduction plate with Eurasia is also seen as low anomalous changes in P and S Velocity."

"Pembangunan infrastruktur jembatan selat sunda diproyeksikan menghabiskan dana hingga + 250 trilyun, sedangkan sedikit sekali investor yang terjaring dalam proyek ini, sehingga dibuatlah beberapa inovasi yang mampu menarik minat investor, salah satunya adalah pengembangan kawasan pariwisata dikawasan selat sunda. Pengembangan kawasan pariwisata selat sunda yang terintegrasi dengan JSS akan dipusatkan pada Pulau Sangiang dengan konsep resort yang didalamnya terdapat theme park sebagai wahana utama. Analisis kelayakan dilakukan dengan menggunakan skema Life Cycle Costing dengan parameter berupa nilai Internal Rate of Return (IRR) sebesar 10,30% serta Net Present Value (NPV) sebesar Rp. 20.100.940.090.529.

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Sunda strait bridge construction is projected to cost up to + 250 trillion, while the few investors in the running for this project, which was made several innovations that can attract investors, one of which is the development of the tourist area of the Sunda Strait region. Sunda strait tourism area development integrated with the JSS will be centered on the concept Sangiang island resort in which there are theme park as the main vehicle. Feasibility analysis is done by using Life Cycle Costing scheme with a parameter value of the Internal Rate of Return (IRR) of 10.30% and the Net Present Value (NPV) of Rp. 20.100.940.090.529."

"ABSTRAKJembatan Selat Sunda menjadi salah satu mega proyek yang direncanakan oleh pemerintah dimana masalah kelayakan selalu menjadi perdebatan untuk dibangun. Dengan pendekatan studi rekayasa nilai, Pembangunan Jembatan Selat Sunda dengan fungsi tambahan ini diperkirakan menghabiskan biaya 187 Triliun dengan rekayasa nilai (fungsi tambahan). Didapat nilai Internal Rate of Return sebesar 7.25%, yang masih dibawah Hurdle Rate Sehingga dibuatlah skema pembiayaan ideal dan kelembagaan berdasarkan Kerjasama Pemerintah Swasta (KPS) untuk membuat proyek layak secara finansial,dengan IRR diatas 13% dan memberikan pemasukan bagi pemerintah.

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ABSTRACTSunda Strait Bridge is one of the biggest project planned by Government of Indonesia where feasibility issues shoud be argued to construct. With Value Engineering approach, Sunda Strait Bridge will be built by added function with estimted Cost about 187 billion dollars with 7.25% Internal Rate of Return (IRR) which under the Minimum Acceptable Rate of Return which conduct Public Private Partnerships (PPP) financing and institutional scheme so that the IRR increases above 13% with give the Revenue to Government."