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ITS » Undergraduate Theses » Fisika
Posted by at 14/07/2011 09:17:13  •  2040 Views


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Kestabilan lereng diakibatkan oleh adanya pengaruh tremor dalam skala kecil serta struktur geologi daerah tersebut. Berdasarkan data PGA Peak Ground Acceleration wilayah Malang merupakan daerah yang rawan terhadap gempa. Studi microtremor yang dilakukan di daerah Kec. Bumiaji Malang ini dimaksudkan untuk mengetahui tingkat kerentanan serta stabilitas lereng. Dari hasil pengukuran di lapangan didapatkan bahwa pada saat nilai Frekuensi natural fo berkisar antara 1- 55 H yang berbanding terbalik dengan h ketebalan sedimen sebaran frekuensi natural didominasi oleh indeks yang kecil yakni antara 1-4 Hz sedangkan untuk nilai frekuensi natural yang besar tersebar di sisi barat pegunungan yang memiliki topografi lebih rendah atau berupa landaian sedang nilai fo rendah berada pada main scarp dengan estimasi letak lapisan bedrock yang semakin dalam. Untuk nilai Amplifikasi Am berkisar antara 25 10 faktor amplifikasi sendiri tidak dipengaruhi oleh topografi wilayah namun lebih didominasi oleh pengaruh geologi permukaan wilayah penelitian. Indeks kerentanan Kg berkisar antara 15 28 nilai Kg17 ditunjukkan sebelah selatan lokasi penelitian daerah ini menunjukkan daerah zona lemah dan mengalami kerusakan masimum jika terjadi gempa.. Nilai efektif shear-strainya antara 100 x10 -6 s.d 6400x 10-6. Dari perhitungan nilai shear strain ditunjukkan nilai 947 tinggi berada di daerah dengan topografi tinggi dan merupakan zona lemah dengan efek gempa bumi yang berupa rekahan crack dan longsoran landslide.


The stability of slopes caused by the influence of local tremor in a small scale and geological structure area. Based on data from the PGA Peak Ground Acceleration Malang is prone to earthquakes. Microtremor studies conducted in Bumiaji district Malang which is intended to determine the level of vulnerability and slope stability. The results of field measurements it was found that when the value of natural frequency f o ranged from 1 to 5.5 H which is inversely proportional to h sediment thickness distribution of natural frequencies is dominated by a small index that is between 1-4 Hz while for large values of natural frequency spread on the west side of the mountains which have a lower topography or a slope while the low- fo value is in the main scarp to the estimated location of the deeper layers of bedrock. Factor of amplification Am ranged from 2.5 to 10 which indicates that the amplification of high value is in the main scarp or slope with high topography which is a height limit of the onset of avalanches. Vulnerability index Kg ranged between 15.10 - 6 28.10-6 Kg values 17 shown in south of identifications areas which has a week zones an have maximum effect of earthquakes. An efective velue of shear-strainya between 100. 10 -6 to 6400. 10-6. From the calculation of the value of shear strain it is shown at high topography of the area with the effect of earthquakes is crack and landslide.

KeywordsEfek Gempa; Frekuensi Natural; Amplifikasi; Microtremor; Kec. Bumi Aji-Malang
Subject:  Tanah (teknologi); Lereng (Mekanika tanah)
  1. Prof.Dr.rer.Nat BAGUS JAYA S. SU
Date Create: 08/02/2011
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Undergraduate-3100011042533
Collection ID: 3100011042533
Call Number: RSFi 624.151 363 Cri a

Undergraduate Thesis of Physics, RSFi 624.151 363 Cri a, 2011

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  1.  ITS-Undergraduate-15041-Abstract_id.pdf - 181 KB
  2.  ITS-Undergraduate-15041-Abstract_en.pdf - 175 KB
  3.  ITS-Undergraduate-15041-Conclusion-185186.pdf - 181 KB

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