C349Abstrak-Penelitian ini dilakukan untuk memperkirakan nilai kecepatan gelombang geser (Vs) dan mikrozonasi gempa di kecamatan Puger, Jember. Wilayah kecamatan Puger merupakan daerah yang memiliki dataran alluvial pantai yang luas dan rawan terjadi gempabumi karena terletak pada jalur tektonik. Analisis mikrotremor menggunakan metode HVSR dilakukan di wilayah kecamatan Puger untuk memetakan mikrozonasi gempa di daerah tersebut. Dari pengukuran mikrotremor yang telah dilakukan, didapatkan nilai indeks kerentanan seismik (Kg) berkisar 14.4 -120 dan estimasi nilai kecepatan gelombang geser pada lapisan sedimen yang didapatkan berkisar 223.07 -765.71 m/s.
Abstrak. Jawa timur bagian utara merupakan daerah prospek dalam industri Minyak dan Gas Bumi. Sebagai zona RMKS (Rembang, Madura, Kangean, dan Subala). Cekungan Jawa Timur utara memiliki kerangka geologi didominasi oleh graben, half-graben, dan sesar lain akibat fase rifting pada periode ekstensional zaman Paleogen dan arah sedimentasi berawal sisi utara cekungan, seiring terbentuknya gunung api hasil subduksi lempeng dibagian selatan maka sedimen terendapkan dari bagian selatan cekungan. Secara regional terdapat potensi reservoar yang terbentuk dari batuan pasir dan karbonat. Berlatarbelakang sumur tua yang terletak di desa Sumberwaru, Kecamatan Wringinanom, Gresik. Indikasi awal daerah tersebut memiliki petroleum system sehingga, penelitian bertujuan mengidentifikasi arah persebaran sedimen dalam tinjauan awal eksplorasi kembali pada daerah tersebut. Data yang digunakan adalah data primer pengukuran metode mikrotremor berdimensi 36.000 m 2 (122 titik) selama 6 hari, dengan frekuensi natural 4-8 Hz. Kata Kunci : Mikrotremor, frekuensi, HVSR, Vs30, Wringinanom Abstract. East Java is the northern region of prospect in the Oil and Gas industry. As a zone of RMKS (Rembang, Madura, Kangean, and Subala). The northern East Java basin has a geological framework dominated by graben, half-graben and other faults due to the rifting phase of the Paleogenian period and the sedimentation direction begins on the north side of the basin, as the resulting volcanic subduction volcano in the southern part of the sediment is deposited from
Biochemical oxygen demand shows the amount of oxygen needed by microorganisms to decompose dissolved organic substances suspended in water. This variable determines water quality. The higher value indicates lower water quality. Obtaining this value requires a lengthy procedure of five days in typical laboratories. This paper proposes to predict biochemical oxygen demand using a radial basis function network with improvement relational fuzzy c-means clustering to set centroid by using 11 parameters that come from water quality records. The dataset used in testing consisting of weekly parameters between 2014-2019. Testing results show performance measurement of mean absolute error, mean square error, root mean square error, mean absolute percentage error, and accuracy using centroid with improvement relational fuzzy c-means 0.15016, 0.3677, 0.19082, 21.64490 and 78.35510 comparing with centroid from fuzzy c-means 0.16002, 0.04021, 0.19963, 22.83184, and 77.16816.
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