Greener Journal of Physical Sciences

Greener Journal of  Physical Sciences  Vol. 3 (2), pp. 038-048, February 2013.

ISSN: 2276-7851 © 2011 Greener Journals

Research Paper

Manuscript Number: 010613358

 

Analysis Study of Landslide Induced By Earthqueke in Tandikat Partamuan
Sub District, Padang Pariaman District, 

West Sumatra, Indonesia 

 

Skunda D.^1*, R. Har², A. Saidi³, and I. Berd⁴

 

 ¹Postgraduated Programme, Padang State University.

²Postgraduated Programme, Andalas University.

³Faculty of Agriculture, Andalas University.

 ⁴Faculty of Agriculture Technology, Andalas University.

 

*¹Corresponding Author’s Email: skundadiliarosta @ yahoo.go.id,

Phone Number: +81374916297

Abstract:

Earthquake on 30 September 2009 and its induced landslide that happened in Sumatra have destructed many things in Padang Pariaman district and Padang City. Exactly, the location of landslide is in Lubuk Laweh, Cumanak, and Kapalo Koto. In these areas there were 200 people, many houses and schools, and also agricultural lands (sawahs, and ladangs) buried. A research was conducted using survey method, which was done by field observing on pumiceous tuff phenomenon affected by water flow in the study area. Beside that, soil and land characteristic data from previous research were used. Among soil physical characteristic used are soil texture (pipete method) and structure, bulk density (gravimetric method), permeability (Debodt method), solum depth (direct measure), and soil organic matter (walkley and Black method). Land characteristic analysis were conducted by observing the field and also analyzing topographic map from google earth programme, land use analysis was conducted by using landuse map. Analysis data of soil and land characteristic were used for landslide grade criterium from Zuidam (1979); Daekombe dan Gardiner (1983); Cooke dan Doorkamp (1994). Based on our field study and some previous research showed that this location has high susceptibility for happening landslide process. It is mainly affected by parent material of the soil which is hornblende hypersthene pumiceous tuff (Qhpt) and pumiceous tuff and andesite (basalt) (Qpt). Those parent materials are sligtly consolidated, soft and light. Generally, the top soil has clay, loam and the subsoil has sand as well as loamy sand texture. The climate of the location is wet tropical season which is characteritized by more than 4000 mm rainfall per year and evently distributed whole years. Based on water balance Penman equation, the study area has surplus of water the whole year. The rolling and steep slope (> 45 % slope) hillocky and strongly disected of the study area were observed in the landslide site. Land use type also promotes landslide processes because coconut trees and mixed garden growing in steep slope. The result of soil and land characteristic analysis showed that soil characteristics of landslide has interval value 13 and land characteristic of landslide has interval value20. By summing the value of soil characteristics and land characteristics, the total was 33. This grade showed that the risk level in landslide area was quite high. Thus, this study area has high interval value of landslide damage. Besides this site, there are many other locations detected having high landslide damage, i.e Sungai Geringging, Koto Timur, and areas thoroughout Maninjau caldera.
 
KEYWORDS: Landslide, Earthqueke, Pumiceous tuff, Wet Tropical climate, Soil and Land characteristics.

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