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ABSTRAKTujuan penelitian ini adalah untuk mengetahui faktor-faktor yang melatarbelakangi terjadinya perilaku komunikasi pengguna aktif Instagram dan mengetahui perilaku komunikasi antar sesama pengguna aktif Instagram. Penelitian ini menggunakan metode kualitatif studi kasus. Teknik pengumpulan data menggunakan wawancara berulang kepada delapan orang informan, observasi, studi pustaka serta analisis dokumen yang berkaitan dengan penelitian ini. Hasil dari penelitian ini mengungkapkan bawah faktor-faktor yang melatarbelakangi terjadinya perilaku komunikasi pengguna aktif instagram adalah fasilitas pendukung, keinginan untuk menghasilkan karya yang lebih baik, frekuensi mengakses yang tinggi serta dorongan kerabat. Perilaku komunikasi antar sesama pengguna aktif instagram yaitu mengunggah foto, melakukan following dan unfollow, memberikan like dan komentar, membubuhi informasi pada foto yang diunggah serta menghadiri kegiatan gathering dan photowalk. ABSTRACTThe purpose of this study was to determine the factors behind the occurrence of communication behavior of active Instagram users and to know the communication behavior among fellow active Instagram users. This study uses a case study qualitative method. Data collection techniques using repeated interviews to eight informants, observation, literature studies and analysis of documents related to this study. The results of this study reveal that the underlying factors in the communication behavior of active users of Instagram are supporting facilities, the desire to produce better works, high frequency of access and encouragement from relatives. Communication behavior among instagram active users is uploading photos, following and unfollowing, giving likes and comments, embedding information on uploaded photos and attending gathering and photowalk activities.

Andesitic volcanic hydrosystems in Indonesia are mostly hydrogeologically unknown despite their socio-economic importance. The development of robust and easy-to-implement methodologies to conceptualize and quantify the water cycle components becomes a prerequisite for their sustainable management.We developed a lumped hydrological model to mimic the structure and functioning of a previously unknown hydrosystem located on the flanks of the Salak volcano (West Java). The structure of the aquifers was revealed with electrical resistivity tomography. The distinction between springs fed by the extensive artesian aquifer and others fed by shallow perched aquifers was obtained mostly using hydrochemistry. The elevation of the recharge area was identified using isotopic analysis of spring water.After designing the hydrological model structure, we carried out a probabilistic parameters exploration using the multiple-try differential evolution adaptive Metropolis algorithm to calibrate aquifer discharge. Multiple Markov chains allow a better exploration of the parameter values. The Bayesian approach provides the best water cycle simulation with a parameter uncertainty analysis, improving the accuracy and representation of the water cycle appropriate for previously unknown hydrosystems.

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Indonesia is located in a subduction zone formed by the collision of continental and oceanic plates. Many volcanoes form as a result of these conditions along the arc. Springs on the volcano's slopes are widely used for domestic, irrigation, and industry water use. Investigating the characteristics of aquifers and springs is essential to ensure groundwater sustainability by providing a robust geological framework. Meanwhile, groundwater in a volcanic geological setting has good quality characteristics because of its occurrence process, which interacts with many minerals in pyroclastic rocks that act as aquifers. The study area is located in the Lido Catchment Area (LCA), which is situated between two distinct volcanic slopes. Geological and morphometric analysis at LCA is the basis of important information relating to its hydrogeological systems. The analysis of thin rock sections and parameters of the physical properties of water in groundwater springs supports our research. We applied a comprehensive geological and morphometric analysis to obtain detailed information about the aquifer. This study aimed to determine the characteristics of aquifers in pyroclastic rocks and their relationship to the formation of springs. From the research conducted, the characteristic of water can be distinguished based on the geological conditions of its constituents. There are 6 different lithological characteristics in the study area: polymictic breccia, monomictic breccia, lapilli, lapilli tuff, coarse tuff, and fine tuff. From the lithology variations obtained, breccia, lapilli, and coarse tuff can play a good role as aquifers. Geological correlations and groundwater systems in the study area show groups of superficial, mixed, and alteration springs. The system of water flows in aquifers through inter-grains or rock fractures. The types of springs in LCA are dominated by depression and fracture types. These results are fundamental information for understanding hydrogeological systems in future volcanic geological settings.