Supriyadi, - and R H Hidayatullah, - and Mahardika Prasetya Aji, - and Taufik Nur Fitrianto, - and Rini Kusumawardani, FT Teknik Sipil (2020) Identifikasi Gerakan Tanah Longsor Dengan Pendekatan Ground Shear Strain Menggunakan Pengukuran Mikroseismik di Graha Taman Nirwana Kota Semarang. Indonesian Journal of Applied Physics, 10 (1). ISSN 2089 - 0133

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Abstract

Mikroseismic research at Graha Nirwana has been carried out as information on lanslide-prone areas that can be used to minimize the risk of lanslide impacts, so as to optimize infrastructure development and spatial development. Data retrieval is done using a 3-component seismometer at 16 points with a distance between 100 m. Data processing is done by HVSR method. The data obtained are in the form of horizontal spectral comparasion to vertical (H/V), dominant frequency and amplification. The value of natural frequency and amplification can be used to determine the value of maximum round acceleration earthquake vulnerability and ground shear strain value. From the results of the study, the thickness of the sediment layer was obtained ranging from 10-30 m which generally consisted of alluvial layers in the form of sandstone and claystone.The earthquake vunerability value ranged between 3-5.1, while the average shear strain value was in the range of 0.001-0.0022 with an average eartquake intensity scale of IV MMI scale. Based on research data, in general the potential for lanslide in the Graha Nirwana area is relatively high. There are areas with high seismic vulnerability and high shear strains that need to be considered. In areas with earthquake vulnerability and high shear strains it is not recommended to construct buildings. Building constructionn in areas with high earthquake vulnerability is recommended to be built with deep foundation with bulidings that are not t o high.

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