The landslides mechanism on the slopes of mount rinjani due to the july 2018 Lombok earthquake

Muhammad Zuhdi, Syamsuddin Syamsuddin, Bakti Sukrisna

Abstract

The Lombok earthquake that occurred in succession, which began at the end of July 2018, triggered landslides on several slopes on Mount Rinjani. The vibrations caused by the earthquake make the slopes unstable due to a decrease in the normal force as a component of the frictional force that binds the deposited material on the mountain slopes. The standard power is one factor that influences the friction force as a material binding to resist landslides. Under ordinary conditions, the average pressure depends on mass, gravity, and the slope's slope. During an earthquake, the normal force can be significantly reduced, causing landslides to occur. The slope stability angle shows the maximum slope angle susceptible to landslides due to an earthquake shock. The greater the peak ground acceleration (PGA) due to an earthquake, will have a landslide effect at a smaller tilt angle. The means that a significant shock due to an earthquake on a slope will be able to launch a landslide on a gentle slope, whereas a small shock can only slide a steep slope with a large angle. From the calculation of slope stability, which depends on the static friction coefficient, and PGA, which depends on the earthquake magnitude and the distance of the earthquake source from the slopes of Mount Rinjani, it gives a maximum value of 61.9o and a minimum value of 45.76o.

Keywords

landslide, Rinjani, Lombok Earthquake

Full Text:

PDF

References

Refice, A., Capolongo, D., Probabilistic modeling of uncertainties in earthquake-induced landslide hazard assessment, Computers & Geosciences 28 p 735–749, 2002

Boomer, J.J., Rodriguez, C. E., Earthquake-induced landslides in Central America, Engineering Geology 63, p 189– 220, 2002

Shou, K.J., Wang, C.F, Analysis of the Chiufengershan landslide triggered by the 1999 Chi-Chi earthquake in Taiwan, Engineering Geology 68 ,p 237–250, 2003

Mahdavifar, M. R., Solaymani, S., Jafari, M. K., Landslides triggered by the Avaj, Iran earthquake of June 22, 2002, Engineering Geology 86, p. 166–182, 2006

Farid, M., Hadi, A. I., Measurement of Shear Strain in Map Liquefaction Area for Earthquake Mitigation in Bengkulu City, TELKOMNIKA, Vol.16, No.4, pp. 1597~1606, Agustus 2018

Syamsudin, Ashari, I., Adhi, M.A., Seismic Hazard And Microzonation Study Of Tanjung Region, North Lombok (Indonesia) Using Microtremor Measurement, Jurnal Pendidikan Fisika Indonesia 14 (2) (2018) 105-110, 2018

Angga, A., Feranie, S., Tohari, A., Karakterisasi Lereng Berpotensi Longsor Serta Upaya Mitigasi Bencananya: Studi Kasus Di Lembang Dan Cijambe-Subang, Fibusi (JoF), Vol. 4 No. 2 Agustus 2016

Lucas, A. Mangeney, J. Ampuero, A. Lucas, A. Mangeney, and J. A. Frictional, “Frictional velocity-weakening in landslides on Earth and on other planetary bodies, Nat. Commun., vol. 5, pp. 1–9, 2017.

S. Parez and E. Aharonov, “Long runout landslides : a solution from granular mechanics,” vol. 3, no. October, pp. 1–10, 2015.

M. Yamada, A. Mangeney, Y. Matsushi, and T. Matsuzawa, “Estimation of dynamic friction and movement history of large landslides,” vol. d, no. November 2017, 2018.

M. P. Billing, “Structural Geology,” Prentice Hall, pp. 58-87, 1946.

A. Ludman, “Physical Geology,” Mc.Graw Hill. inc. pp.194-213, 1982.

D. Halliday, R. Resnick, J. Walker, “Fundamental 0f Physics” John Wiley & Sons.Inc. 6th Edition, pp. 100–103, 2001.

Zuhdi, M., Supriyadi, Design And Construction Of Friction Coefficient Measuring Instrument Based On Slope Of Lanslide Plane, J. Pijar MIPA, Vol.14 No. 3, September 2019: 192-196

Refbacks

  • There are currently no refbacks.