Two dimensions (2D) seismic profile of Baruna and Jaya lines at North-East Java Basin show seismic reflector characteristics that can be used to interpret sediment thickness and continuity. Those reflector characteristics that can be applied for seismic facies analysis that represents depositional environment. This study starts from seismic data processing that using Kirchhoff Post Stack Time Migration method which is 2D seismic profile as result. Seismic reflector characterization has been done to both 2D profiles. Seismic reflector characterization was grouped as (i) individual reflection, (ii) reflection configuration, (iii) reflection termination, (iv) external form. Individual reflection characteristics show high and medium amplitude, medium and low frequency, and continuous. Configuration reflection is continuous with parallel and subparallel type. Reflection termination shows on lap, and external form shows sheet drape. Local mound appearance can be interpreted as paleo-reef. Facies seismic analysis result for this study area is a shelf.
This study was aimed to develop a method for metal analysis in continuous integration using voltammetry techniques. The research subject was copper(II) ions. The objects of research were linearity, scan rate, repeatability of readings, and the presence of Cu(II) levels in well water samples. In this study, a selective electrode was developed with a solid membrane voltammetry system using differential pulse voltammetry measurement. The results showed the regression line of voltammetry method, y = 10.265 ln (x) + 330.47, with a correlation value of 0.9654, the optimum scan rate was 10 mV/s, and within five repetitions of each measurement for one electrode, it showed good repeatability. Meanwhile, the result of regression with the UV-Vis spectrophotometric method for Cu(II) was y = 0.12386x + 0.00879 with a correlation value of 0.9943. The voltammetry method was found to be much better than the UV-Vis method because it was able to be used for analysis up to a concentration of 6.35 × 10–4 ppm (or 1.00 × 10–11 M), while the UV-Vis method was only able to analyze up to 1.5 ppm (or 2.36 × 10–5 M).
The quality of seismic is important for interpretation. Prestack Depth Migration produce better quality of seismic imaging. The seismic generated through PSDM method has better seismic reflector and geological structure appearance compared to Prestack Time Migration (PSTM) method. Accurate interval velocity modeling is a key in PSDM process, involving dix transformation, coherency inversion, and tomography. Comparison between PSTM and PSDM show that PSDM offer better imaging for interpretation because PSDM has better seismic reflector continuity and good geological appearance.
Seafloor mapping shows size, position, and depth of morphology and any objects at seafloor. Therefore, these technologies can be used to search and rescue (SAR) which are applied when AirAsia QZ8501 was missing at southern Karimata Strait using three vessels, RV. Baruna Jaya I, MV. Java Imperia, and KN. Trisula. Seafloor mapping technologies that applied were (i) multibeam echosounder system (MBES), (ii) side scan sonar (SSS), (iii) magnetometer (MM), (iv) autonomous underwater vehicle (AUV), (v) pinger locator (PL), (vi) underwater remotely operated vehicles (ROV). MBES, SSS, AUV, and USBL use acoustic wave that transmitted by transducer to seafloor then it back to reciever. Indirectly, MBES and SSS generate 3D image based on acoustics signal according to sound propagation and its travelling time in sea from transducer to receiver. MBES and SSS transmit acoustic wave with frequency 180 kHz for MBES and dual-frequency (120 kHz and 420 kHz) for SSS. AUV that attached SSS working with frequency 600/1600 kHz. USBL that used as pinger locator transmit acoustic wave with same frequency as blackbock which known using 37.5 kHz. USBL inform distance between transducer to blackbox, so that the position of blackbock can be determined by triangulation method. MBES and SSS on KR. Baruna Jaya I detect suspect anomaly with height about 3 meters. SSS that installed on AUV and operated on KN Trisula detect an object looks like human body. Triangulation method was done on MV. Java Imperia has found blackbox position.
Gas-charged sediment is one of the parameter for geohazard study in infrastructure, especially in a swamp area. Instability of sediment layer for example subsidence and landslide result in geohazard potential is caused by gas-charged sediment. The seismic single channel can be used to identify gas charged sediment location. Seabed morphology is collected from bathymetry and tidal survey. From the seismic profile, interpretation shows gas-charged sediment indication in Line A and Line B. Those indications emerged by the presence of acoustic turbid zone and acoustic blanking. The location of Line A and Line B will be the spotlight in next geotechnical port construction study.
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