Bali is one of the areas prone to earthquake and tsunami as being at the junction of two plates, namely the Eurasian plate and the Indo-Australian plate is located in the south of Bali and back arc trust zones are located in the North of Bali. We need research on the potential dangers of earthquakes and tsunami in Bali are based on the value of seismicity which is interpreted by the value of b and a. This study uses earthquake data on the coordinates 6?-11? SLand 114?-116? EL with 339 data that was processed using Zmap in order to obtain the value of b at 1.57 ± 0.008 and the value of a is 10.6 and maximum magnitude of 7.1 Mw. From mapping the values ??of b and a known area that has the highest value of b and a lies in the sea area to the south of Bali, Karangasem and Buleleng to the northern region of Bali. Furthermore, for mapping the tsunami in Bali using the TOAST application obtained tsunami prone areas of Bali, Kuta Beach, East Buleleng and Karangasem.
An investigation of risk identification earthquake disaster in Nusa Tenggara Barat by three factors: the danger factor of earthquakes is Peak Ground Acceleration(PGA), vulnerability factor is population density by district, as well as the capasity factors are HDI (Human Development Index) by district in the province of West Nusa Tenggara has be done. PGA value calculation was performed using the attenuation function Fukushima and Tanaka with earthquake parameter data from 1970 - 2014 with the criteria of magnitude ? 4.5mB, depth ? 60 km and the epicenter in the range of 7.5o - 12o and 115o-120o BT and for disaster risk index calculation earthquake using AHP (Analytical Hierarchy Process). From the calculation of the obtained regions with earthquake disaster risk levels are highest are southern Dompu, Mataram, Bima, northern Bima Regency while the lowest West Sumbawa regency and southern Sumbawa regency.
Berdasarkan catatan sejarah kegempaan, Pulau Lombok merupakan kawasan yang sering mengalami gempa kecil hingga menengah. Kabupaten Lombok Tengah khususnya wilayah Mandalika merupakan daerah yang terletak di bagian selatan pulau Lombok yang dekat dengan sumber kegempaan yaitu sumber gempabumi Penunjaman Parit Jawa atau Zona Benioff Wadati Jawa-Bali. Zona megathrust atau subduksi dengan potensi magnitudo maksimum 8,7 dapat memberikan dampak signifikan apabila mengguncang wilayah selatan Lombok dan sumber gempa ini berpotensi tsunami. Penelitian ini bertujuan untuk memberikan gambaran mengenai genangan tsunami maksimum di wilayah Kuta Mandalika, sehingga dapat dijadikan acuan tambahan dalam penentuan jalur evakuasi dan titik kumpul. Selanjutnya menyusun sebuah peta yang menggambarkan jalur evakuasi di Mandalika, Kabupaten Lombok Tengah terhadap bahaya landaan tsunami. Metode yang digunakan adalah Community Model Interface for Tsunami (ComMIT) melalui Method of Splitting Tsunami (MOST) buatan National Oceanic and Athmospheric Administration (NOAA) Center for Tsunami Research. Hasil pemodelan menunjukkan bahwa tinggi dan inundasi paling besar ditimbulkan oleh sumber gempabumi Megathrust segmen Bali dengan maginitude 9,0. Sedangkan Peta Flow Depth menunjukkan bahwa genangan maksimum yang terjadi di Kuta sekitar 0,5 m hingga 12 m di bibir pantai dengan luas genangan 15,27 km2. Peta Flow Depth ini selanjutnya dapat digunakan sebagai acuan dasar dalam pembuatan peta evakuasi tsunami.
In this research, we have determined the model of empirical formula of Peak Ground Acceleration (PGA) based on general formula of Lin and Wu using 62 observational PGA data which corresponds to earthquake parameter data of Bali and its surroundings for year 2008-2013. Based on the regression analysis, the geometrical spreading coefficient is a = -2.019, the magnitude coefficient b = 0.894, the empirical model formula constant c = 0.551, and the empirical model of PGA model for Denpasar is. The results of statistical verification yielded a strong positive linear correlation of 0.853 with the residual error of 0.035.
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