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Abstract. Predicting landslide displacement is challenging, but accurate predictions can prevent casualties and economic losses. Many factors can affect the deformation of a landslide, including the geological conditions, rainfall and reservoir water level. Time series analysis was used to decompose the cumulative displacement of landslide into a trend component and a periodic component. Then the least-squares support vector machine (LSSVM) model and genetic algorithm (GA) were used to predict landslide displacement, and we selected a representative landslide with episodic movement deformation as a case study. The trend component displacement, which is associated with the geological conditions, was predicted using a polynomial function, and the periodic component displacement which is associated with external environmental factors, was predicted using the GA-LSSVM model. Furthermore, based on a comparison of the results of the GA-LSSVM model and those of other models, the GA-LSSVM model was superior to other models in predicting landslide displacement, with the smallest root mean square error (RMSE) of 62.4146 mm, mean absolute error (MAE) of 53.0048 mm and mean absolute percentage error (MAPE) of 1.492 % at monitoring station ZG85, while these three values are 87.7215 mm, 74.0601 mm and 1.703 % at ZG86 and 49.0485 mm, 48.5392 mm and 3.131 % at ZG87. The results of the case study suggest that the model can provide good consistency between measured displacement and predicted displacement, and periodic displacement exhibited good agreement with trends in the major influencing factors.

Abstract. Landslides whose slide surface is gentle near the toe and relatively steep in the middle and rear part are common in the Three Gorges Reservoir area, China. The mass that overlies the steep part of the slide surface is termed the "driving section", and that which overlies the gentle part of the slide surface is termed the "resisting section". A driving–resisting model is presented to elucidate the deformation mechanism of reservoir landslides of this type, as exemplified by Shuping landslide. More than 13 years of field observations that include rainfall, reservoir level, and deformation show that the displacement velocity of Shuping landslide depends strongly on the reservoir level but only slightly on rainfall. Seepage modeling shows that the landslide was destabilized shortly after the reservoir was first impounded to 135 m, which initiated a period of steady deformation from 2003 to 2006 that was driven by buoyancy forces on the resisting section. Cyclical water level fluctuations in subsequent years also affected slope stability, with annual "jumps" in displacement coinciding with drawdown periods that produce outward seepage forces. In contrast, the inward seepage force that results from rising reservoir levels stabilizes the slope, as indicated by decreased displacement velocity. Corrective transfer of earth mass from the driving section to the resisting section successfully reduced the deformation of Shuping landslide and is a feasible treatment for huge reservoir landslides in similar geological settings.

Chapter 1. Editorial of the new open access book series "Progress in Landslide Research and Technology" (Kyoji Sassa) -- Part I. Original Articles -- Chapter 2. Key Techniques of Prevention and Control for Reservoir Landslide Based on Evolutionary Process (Huiming Tang) -- Chapter 3. Landslide research and technology in patent documents (Matjaž Mikoš) -- Chapter 4. Scalable Platform for UAV Flight Operations, Data Capture, Cloud Processing and Image Rendering of Landslide Hazards and Surface Change Detection for Disaster-Risk Reduction (David Huntley) -- Chapter 5. Ongoing persistent slope failures at the toe of a giant submarine slide in the Ryukyu Trench that generated the AD 1771 Meiwa tsunami (Kiichiro Kawamura) -- Chapter 6. Experimental simulation of landslide creep in ring shear machine (Netra Prakash Bhandary) -- Chapter 7. Assessment of the effects of rainfall frequency on landslide susceptibility mapping using AHP method: a case study for a mountainous region in central Vietnam (Chi Cong Nguyen) -- Chapter 8. Suffosion landslides as a specific type of slope deformations in the European part of Russia (Oleg V. Zerkal) -- Chapter 9. In situ triaxial creep test on gravelly slip zone soil of a giant landslide: innovative attempts and findings (Qinwen Tan) -- Chapter 10. Challenges and lessons learned from heavy rainfall induced geo-disasters over the last decade in Kyushu Island, Japan (Noriyuki Yasufuku).

Part I: ICL Landslide Lesson -- Sliding-surface liquefaction and undrained steady-state shear strength -- Identification and Mitigation of Reservoir Landslides Cases Studied in the Three Gorges Reservoir Area of China -- Part II: Original articles -- Impact of input data on the quality of the landslide susceptibility large-scale maps: A case study from NW Croatia -- Landslide warning systems in high-income countries: past accomplishments and expected endeavours -- Modelling of Landslide-Structure Interaction (LSI) through Material Point Method (MPM) -- Landslide Research and Technology in International Standards -- Mathematical and numerical modeling of slope stability for the Mong Sen landslide event in the Trung Chai commune, Sapa, Vietnam -- Landslide early warning system based on the empirical approach - Case study in Ha Long City (Vietnam) -- The modern activity of the Buzulgan landslide and its influence on the debris flow hazard for the Tyrnyauz town (Northern Caucasus, Russia) -- A risk evaluation method of unstable slopes using multipoint tilting sensors -- Part III: IPL/WCOE/KLC2020 -- Community Level Slope Disaster Risk Reduction Program through Multi-Scale Mapping by Mountain Ethnic Group in Northern Vietnam - Project Study by JICA / Lao Cai DARD / ITST -- Landslide Risk Assessment in the tropical zone of Vietnam as a contribution to the mitigation of natural disaster vulnerability -- Protection and conservation of Georgian rupestrian cultural heritage sites: a review -- Spatial and temporal characterization of landslide deformation pattern with Sentinel-1 -- Lessons from 2019-2020 landslide risk assessment in an urban area of volcanic soils in Pereira-Colombia -- Part IV: ICL Landslide Teaching Tools -- Zonation of landslide susceptibility in the Gipuzkoa province (Spain): an application of LAND-SUITE -- Landslide and soil erosion inventory mapping based on high-resolution remote sensing data: A case study from Istria (Croatia) -- Part V: Technical Notes and Case Studies -- Landslide monitoring with RADARSAT Constellation Mission InSAR, RPAS-derived point-clouds and RTK GNSS time-series in the Thompson River Valley, British Columbia, Canada -- Digital terrain models derived from unmanned aerial vehicles and landslide susceptibility -- Use of GIS to assess susceptibility per landform unit to gravitational processes and their volume.

Part I: ICL Landslide Lesson -- Advancements in shear strength interpretation, testing, and use for landslide analysis -- Rock Avalanches in the Tibet Plateau of China -- Part II: Original articles -- Landslide Susceptibility Zonation Using GIS-based Frequency Ratio Approach in the Kulon Progo Mountains Area, Indonesia -- Physically-based regional landslide forecasting modelling: model set-up and validation -- Consequence - frequency matrix as a tool to assess landslides risk -- Do not let your guard down: landslide exposure and local awareness in Mexico -- Landslides in Higher Education Curricula and Beyond -- Community Scale Landslide Resilience: A citizen-science approach -- Remedial Measures Impact on Slope Stability and Landslide Occurrence in Small-Scale Slope Physical Model in 1g Conditions -- Surficial geology and geomorphology of the North Slide, Thompson River valley, British Columbia: application of fundamental geoscience information to interpretations of geospatial monitoring results -- High Resolution Numerical Weather Simulation for Orographic Precipitation as an Accurate Early Warning Tool for Landslide Vulnerable Terrains -- Climate Change as Modifier of Landslide Susceptibility: Case Study in Davao Oriental, Philippines -- Fractal-based evaluation of the spatial relationship between conditioning factors and the distribution of landslides (A case study in Tinh Tuc, Cao Bang province, Vietnam) -- Procedure of Data Processing for the Improvement of Failure Time of a Landslide Based on the Velocity and Acceleration of the Displacement -- Numerical analysis of the effect of rainfall on the stability of sandstone-covered mudstone cutting slopes -- Part III: Review articles -- Post-formation behaviour of Hattian Landslide Dam and post-breaching situation -- Investigation of debris flow impact mechanisms and designs -- A review of the disaster risk assessment perspectives -- Part IV: IPL/WCOE/KLC2020 -- Application of LAND-SUITE for landslide susceptibility modelling using different mapping units. A case study in Croatia -- An Integrated approach to landslides risk management for local and national authorities -- Assessing landslide hazard in the High City of Antananarivo, Madagascar (UNESCO Tentative site) -- Part V: ICL Landslide Teaching Tools -- Teaching Tools for LS-Tsnnamis -- Part VI: Technical Notes and Case Studies -- CliRtheRoads – An integrated approach to landslide risk management on roads in Serbia -- Part VII: World Landslide Reports -- Rock slope instabilities affecting the AlUla archaeological sites (KSA) -- Refugees' perception of landslide disasters: Insights from the Rohingya camps in Cox's Bazar, Bangladesh.