Daerah penelitian secara administratif berada di Kecamatan Bener, Kabupaten Purworejo, Jawa Tengah. Secara geomorfologi, bentuk lahan daerah tersebut terdiri dari Perbukitan Struktural (S1), Lembah Homoklin (S2), Dataran Alluvial (F1), Tubuh Sungai (F2), dan Dataran Limpah Banjir (F3). Lito-stratigrafi daerah penelitian mulai dari batuan tertua, disusun oleh Satuan Breksi-vulkanik Kaligesing, Satuan Lava-andesit Kaligesing, kedua satuan berumur Oligosen Akhir hingga Miosen Awal, Satuan Batugamping-pasiran Sentolo berumur Miosen Tengah – Pliosen Awal (N14 – N19), dan Satuan endapan alluvial berumur recent. Di daerah penelitian juga dijumpai intrusi andesit berumur Oligosen Akhir – Miosen Awal. Struktur geologi berupa kekar dan sesar secara umum mempunyai orientasi Timurlaut – Baratdaya termasuk reverse left slip fault, dan Baratlaut – Tenggara, merupakan right lateral slip fault. Dari hasil analisis kestabilan lereng terhadap enam lokasi lereng batu berdasarkan metode Markland, diketahui bahwa lereng Wadas berpotensi longsor tipe wedge failure dan planar slide, lereng Kaliwader 1 berpotensi longsor tipe wedge failure, lereng Kaliwader 2 berpotensi longsor tipe wedge failure, lereng Kaliwader 3 berpotensi longsor tipe wedge failure, lereng Kaliwader 4 tidak berpotensi longsor, dan lereng Ngargosari berpotensi terjadi longsoran tipe wedge failure dan tipe planar slide. Penanggulangan longsor dapat dilakukan dengan melakukan pelandaian lereng dan atau metode trap/terasering.

Bener District, Purworejo Regency, Central Java, Indonesia, located in the Kulon Progo Mountains can be classified as a high-risk area. Many experts and researchers have studied landslides, but there has been little research on rock slope kinematics. In fact, when such a rock slope is unstable and poorly monitored, it has the potential to endanger the community or facilities at the adjacent site. This is why slope kinematics research is required. To complete this study, rock kinematics analysis using the Markland method was performed on six representative slopes. The assessment results show that Kaliwader slope A, Kaliwader slope B, and Argosari slope each tend to collapse with wedge failure, Kaliwader slope D and Wadas slope have the potential for wedge failure and planar slide, but Kaliwader slope C does not. Despite their steep inclination, slopes that are likely to fail are strongly related to the presence of geologic structures, particularly joints, and faults, at the sites. The findings of this study will be helpful in the development of landslide vulnerability zones in the context of disaster mitigation.