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Perhitungan Nilai Percepatan Tanah Maksimum Berdasar Rekaman Sinyal Accelerograph di Stasiun Pengukuran UNSO Surakarta Sungkowo, Ari
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 8, No 1 (2018) : IJAP Volume 8 ISSUE 01 YEAR 2018
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v8i1.14326

Abstract

Rekaman-rekaman yang dihasilkan oleh strong motion accelerograph merupakan hal yang penting dalam teknik kegempaan sebagai dasar untuk karaterisasi getaran tanah yang digunakan dalam desain seismik. Telah dilakukan perhitungan nilai percepatan tanah maksimum (PGA) menggunakan data rekaman sinyal yang terekam oleh sensor Strong Motion Accelerograph di stasiun pengukuran UNSO yang terpasang di laboratorium hidrologi fakultas teknik sipil Universitas Sebelas Maret Surakarta. Sensor yang terpasang bertipe TSA 100 yang diproduksi oleh Metrozet USA. Rekaman gempa yang digunakan dalam perhitungan ini adalah rekaman gempabumi tanggal 03 Agustus 2017 dengan magitudo 5.3 SR, epicenter gempabumi di BaratDaya Cilacap Jawa Tengah. PGA dihitung dengan metode absolut yaitu menggunakan amplitudo maksimum sinyal yang terekam di sensor. Software yang digunakan untuk menghitung PGA adalah software dadiSP. Nilai PGA pada masing -masing hasil perhitungan adalah 0.307 Gal komponen N-S, 0.302 Gal komponen E-W dan 0.133 Gal komponen U-D. Intensitas gempa di stasiun pengukuran UNSO adalah I MMI. Hasil ini menunjukan sensor UNSO dapat dipergunakan untuk mengetahui nilai PGA dari suatu dari suatu gempabumi.
Acceleration Response Spectra for M 7.4 Donggala Earthquake and Comparison with Design Spectra Sunardi, Bambang; Sulastri; Karnawati, Dwikorita; Haryoko, Urip; Rohadi, Supriyanto; Pramono, Sigit; Sungkowo, Ari
Journal of Sustainable Engineering: Proceedings Series Vol 1 No 1 (2019)
Publisher : Fakultas Teknik Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1412.009 KB) | DOI: 10.35793/joseps.v1i1.3

Abstract

A 7.4 magnitude earthquake have strucked Donggala on September 28th 2018, followed by tsunami and liquefaction which hit Palu, Central Sulawesi, a few minutes later. This event had resulted in damage to buildings, and caused more than 2,000 people were killed and injured. Indonesia already have a building code in form of SNI 1726:2002 which had been updated to SNI 1726:2012. This paper analyses the hazard level caused by the 2018 Donggala earthquake compared to the existing design spectra, as mentioned in SNI 1726:2002 and SNI 1726:2012. A simple analysis was carried out by comparing Donggala earthquake’s acceleration response spectra with the existing design spectra, at the MPSI accelerograph station. The site class at MPSI station is hard soil (SC). The seismic hazard in Palu and Donggala refers to SNI 1726:2002 is included in the earthquake area 4. The maximum earthquake response factor for earthquake area 4 is about 0.6 for hard soil type (SC). The MPSI station recorded peak ground acceleration of Donggala earthquake around 0.14 g. The acceleration response spectra recorded at the MPSI station showed a peak value of around 0.71 g for the N component. This value is actually still below the design spectra referring to SNI 1726:2012, which the peak value is 0.88 g for SC, but, it exceeded the design spectra of SNI 1726:2002.