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ITS » Master Theses » Geoteknik S2 Posted by aprill@is.its.ac.id at 30/10/2015 15:06:37 • 2404 Views
MICROZONATION STUDY AT NGANTANG-MALANG AREA WITH MICROTREMOR APPROACH
Author : JUNAIDI ( 3111201002 )
ABSTRAK
Sebagian wilayah Indonesia termasuk daerah yang rawan terjadi gempa
bumi dan merupakan daerah perbukitan tanah residual yang sangat rawan
mengalami kelongsoran pada musim hujan. Aktivitas iklim perubahan musim
dan kegempaan merupakan dua faktor alam pemicu utama yang memberikan kontribusi terhadap kelongsoran. Tingkat kerusakan dan bahaya gempa bumi juga dipengaruhi oleh pengaruh lokasi setempat local site effect. Metode HVSR microtremor sangat berguna untuk mikrozonasi gempa kuantitatif dan penilaian ketidakstabilan lereng yang disebabkan oleh gempa. Penelitian ini bertujuan
menentukan mikrozonasi lereng tanah residual berdasarkan frekuensi natural
puncak HVSR indeks kerentanan tanah dan shear-strain tanah pada musim
kemarau dan musim hujan di Dusun Songkorejo Desa Jombok-Kecamatan
Ngantang. Telah dilakukan pengukuran mikrotremor sebanyak 51 titik uji dengan
grid 15 m x 15 m di lokasi penelitian. Pengukuran dilakukan pada dua musim
yaitu musim kemarau dan musim hujan. Dari penelitian ini dihasilkan frekuensi
natural tanah yang hampir relatif sama pada musim kemarau dan musim hujan.
Sedangkan nilai puncak HVSRfaktor amplifikasi maksimum meningkat 2740
indeks kerentanan tanah dan shear-strain tanah maksimum meningkat 6870
pada musim hujan dibandingkan dengan musim kemarau. Zona longsor
landslide berdasarkan shear-strain tanah pada saat musim hujan teridentifikasi pada saat PGA gempanya diatas 03g.
ABSTRACT
Some parts of Indonesia are categorized areas prone to earthquakes and the hilly areas of residual soil type is very vulnerable to sliding in the rainy
season. Activity climate change of seasons and seismicity are the two main
drivers of natural factors that contributed to the landslide. The level of damage and earthquake hazard is also affected by influence local site effect. Microtremor HVSR method is very useful for quantitative seismic microzonation and assessment of slope instability caused by the earthquake. This study aims to determine residual soil slope microzonation based on predominant frequency the peak HVSR soil vulnerability index and shear-strain soil during the dry season
and the rainy season in Songkorejo Hamlet Jombok Village-Ngantang.
Microtremor measurements have been carried out as many as 51 test
points using a grid pattern of 15 mx 15 m at the study site. Measurements were
taken at two seasons namely dry and rainy seasons. From the study has been
suggested that the soil predominant frequencies are relatively the same during the dry and rainy season Meanwhile HVSR peak amplification factor maximum value increased by 27.40 maximum soil vulnerability index and shear-strain increased 68.70 in the rainy season than the dry season. Landslide zones based on the shear-strain soil during the rainy season has been identified at the time of earthquake above 0.3 g PGA.
Keywords:
Sebagian wilayah Indonesia termasuk daerah yang rawan terjadi gempa
bumi dan merupakan daerah perbukitan tanah residual yang sangat rawan
mengalami kelongsoran pada musim hujan. Aktivitas iklim (perubahan musim)
dan kegempaan merupakan dua faktor alam
Subject
: mikroseismik
Contributor
Dr. Ir. Ria Asih Aryani Soemitro, M.Eng.
Dr. Dwa Desa Warnana, S.Si., M.Si.
Date Create
: 30/10/2015
Type
: Text
Format
: pdf
Language
: Indonesian
Identifier
: ITS-Master-31103150001503
Collection ID
: 31103150001503
Call Number
: RTS 551.457 Jun s
Source Master Theses of Civil Engineering, RTS 551.457 Jun s, 2015
Coverage ITS Community
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