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ITS » Master Theses » Geoteknik S2
Posted by aprill@is.its.ac.id at 30/10/2015 15:06:37  •  1764 Views


STUDI MIKROZONASI WILAYAH NGANTANG-MALANG DENGAN PENDEKATAN MIKROTREMOR

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.



KeywordsSebagian 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
  1. Dr. Ir. Ria Asih Aryani Soemitro, M.Eng.
  2. 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

Rights
Copyright @2015 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




[ Download - Open Access ]

  1.  ITS-Master-39293-3111201002-Abstract_in.pdf - 357 KB
  2.  ITS-Master-39293-3111201002-Abstract_en.pdf - 360 KB
  3.  ITS-Master-39293-3111201002-Conclusion.pdf - 840 KB




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