Abstract

This seminar will be held online. Zoom details will be sent to members of the Earth Sciences department via email. Please contact the organisers if you are outside the department and would like to attend

Characterization of active faults in humid areas is difficult because geomorphic expression of faults subdued by rapid weathering and erosion. Indonesia has many active faults with potential seismic hazards, but many of them are not well studied, particularly for the inland faults. This mainly because many of the active faults are diffused and their characterization is challenging. Most of them are buried by thick sediments or soil and will not detectable until they broke during an earthquake. In this talk, I will provide an overview of our completed and ongoing active fault studies in Indonesia. Some of the examples are along the Cimandiri, Pasuruan, Aceh, and Palu Koro faults. We implemented various methods including tectonic geomorphic mapping, quantitative geomorphic analysis and paloeseismology to study these faults.

Further reading: Marliyani, G. I., Arrowsmith, J. R., and Whipple, K. X. (2016), Characterization of slow slip rate faults in humid areas: Cimandiri fault zone, Indonesia, J. Geophys. Res. Earth Surf., 121, 2287– 2308, doi:10.1002/2016JF003846.

Marliyani, G. I., Helmi, H., Arrowsmith, J. R., Clarke, A., (2020) Volcano morphology as an indicator of stress orientation in the Java Volcanic Arc, Indonesia, Journal of Volcanology and Geothermal Research, 400, https://doi.org/10.1016/j.jvolgeores.2020.106912.