Tree-ring eccentricity-based dating of landslide movements: Defining a new effective approach
Por:
Silhan, Karel, Guillen, Karla Aurora De la Pena, Allende, Teodoro Carlon, Tsou, Ching-Ying, Zhang, Yong
Publicada:
1 ene 2024
Ahead of Print:
1 oct 2023
Categoría:
Earth-surface processes
Resumen:
Dendrogeomorphic dating of landslide movements is nowadays a frequently
used tool for understanding past landslide behaviour. One of the most
widespread growth disturbances induced by landslides is tree-ring
ec-centricity. However, extracting the landslide signal from the time
series of its values is a challenge that has suffered from many
shortcomings so far. In this study, a new approach based on the
detection of changes in tree-ring eccentricity values was developed. The
approach, which combines the advantages of previous approaches, was
tested on four landslides in different physical-geographical conditions
with different tree species of different ages. For all landslides, the
year of activity was well known and analyses of the results focused on
this year. The tested methodological approach successfully detected all
these known years. However, it also detected a higher amount of noise in
two cases, which may have been caused by imperfect knowledge of
pre-landslide slope ac-tivity or creep. An important feature identified
in the results obtained by the approach was their potential
in-dependence of tree age. As with the use of other macroscopic growth
disturbances, this approach does not allow dating with seasonal
accuracy. However, compared to previous methodological approaches
working with tree-ring eccentricity analysis, the new approach
demonstrated significant advantages. The procedure does not truncate the
reconstructed time series, does not smooth the landslide signal, and
uses exactly defined landslide signal thresholds.
Filiaciones:
Univ Ostrava, Fac Sci, Dept Phys Geog & Geoecol, Chittussiho 10, Ostrava Slezska 71000, Czech Republic
Univ Nacl Autonoma Mexico, Ctr Invest Geog Ambiental, Campus Morelia,Antigua Carretera Patzcuaro Num, Morelia, Mexico
Univ Nacl Autonoma Mexico, Unidad Michoacan, CONACYT, Inst Geofis, Antigua Carretera Patzcuaro 8701, Morelia, Michoacan, Mexico
Hirosaki Univ, Fac Agr & Life Sci, Hirosaki, 0368561, Japan
Chinese Acad Sci, Key Lab Land Surface Pattern & Simulat, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
Bronze, All Open Access; Bronze
|