1. Department of Earth Resources Engineering, Kyushu University, 744, Motooka, Nishiku, Fukuoka 819-0395, Japan
2. Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Jalan Grafika No. 2 Kampus UGM Bulaksumur, Yogyakarta, Daerah Istimewa Yogyakarta 55281, Indonesia
3. Unconventional Geo-Resources Research Group, Faculty of Engineering, Universitas Gadjah Mada, Jalan Grafika No. 2 Kampus UGM Bulaksumur, Yogyakarta, Daerah Istimewa Yogyakarta 55281, Indonesia