Seasonal, long-term, and short-term deformation in the central range of Taiwan induced by landslides

Ya Ju Hsu, Rou Fei Chen, Ching Weei Lin, Horng Yue Chen, Shui Beih Yu

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Seasonal movement of GPS stations is often attributed to hydrological loading and other environmental factors. For the first time we observe seasonal motion associated with slow-moving landslides. Eight of 26 continuous GPS (cGPS) sites in the Central Range of Taiwan show long-term landslide-induced motion at rates of ~3-15 mm/yr, ~20%-60% of their tectonic interseismic velocities. The directions of movements after heavy rains and in the wet season are consistent with the slope directions derived from a high-resolution elevation model constructed by airborne lidar. Long-term and seasonal interseismic motions are modulated by slow-moving landslides. Seasonal motions of landslides at Lushan show peak to peak amplitudes of ~3-19 mm. Estimates of interseismic crustal strain can be biased if surface processes are not taken into account. Preliminary analyses indicate that rainfall and topography play strong roles in the occurrence of landslides. Discrimination between surface processes and motion that has a tectonic origin is the key to natural hazard assessments.

Original languageEnglish
Pages (from-to)991-994
Number of pages4
JournalGeology
Volume42
Issue number11
DOIs
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Geology

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