3D ground-penetrating radar applied to paleoseismology: Examples from the Wellington fault, New Zealand
Détails
ID Serval
serval:BIB_76AAF97C94FF
Type
Actes de conférence (partie): contribution originale à la littérature scientifique, publiée à l'occasion de conférences scientifiques, dans un ouvrage de compte-rendu (proceedings), ou dans l'édition spéciale d'un journal reconnu (conference proceedings).
Collection
Publications
Institution
Titre
3D ground-penetrating radar applied to paleoseismology: Examples from the Wellington fault, New Zealand
Titre de la conférence
Proceeding of the 8th International Conference on Ground Penetrating Radar, Gold Coast, Australia
ISBN
0819437263
ISSN-L
0277-786x
Statut éditorial
Publié
Date de publication
2000
Editeur⸱rice scientifique
Noon D.A., Stickley G.F., Longstaff D.
Volume
4084
Pages
478-481
Langue
anglais
Résumé
The main goal of paleoseismology is to estimate future seismic hazard
through an improved characterization of past fault behavior in seismically
active environments. Paleoseismological investigations provide critical
knowledge about ancient earthquakes that have occurred along active
faults. Such knowledge may be used to refine estimates of local and
regional seismic hazard. Earthquake-related features (e.g. faults,
folds and fissure fill) observed in trenches and outcrops generally
exhibit complex three-dimensional (3D) geometries. Ground penetrating
radar (GPR) data allow information extracted from these conventional
paleoseismological observations to be extrapolated and complemented.
We have conducted detailed 2D and 3D GPR surveys at various locations
along the Wellington Fault in the Hutt Valley of New Zealand. Fault-related
structures are seen clearly in the GPR data as offsets or abrupt
terminations of laterally continuous reflections. In cross-sections
and time- slices extracted from the 3D GPR data sets, sudden changes
of reflection pattern determine the principal fault plane. After
applying a novel topographic migration scheme to the GPR data, individual
lithologic units may be mapped. Our results correlate well with observations
at nearby outcrops. They show that 3D GPR surveys are capable of
supplying clear subsurface images in typical paleoseismological trenching
environments. GPR images may be used to guide trenching strategies
aimed at features of special interest to paleoseismology.
through an improved characterization of past fault behavior in seismically
active environments. Paleoseismological investigations provide critical
knowledge about ancient earthquakes that have occurred along active
faults. Such knowledge may be used to refine estimates of local and
regional seismic hazard. Earthquake-related features (e.g. faults,
folds and fissure fill) observed in trenches and outcrops generally
exhibit complex three-dimensional (3D) geometries. Ground penetrating
radar (GPR) data allow information extracted from these conventional
paleoseismological observations to be extrapolated and complemented.
We have conducted detailed 2D and 3D GPR surveys at various locations
along the Wellington Fault in the Hutt Valley of New Zealand. Fault-related
structures are seen clearly in the GPR data as offsets or abrupt
terminations of laterally continuous reflections. In cross-sections
and time- slices extracted from the 3D GPR data sets, sudden changes
of reflection pattern determine the principal fault plane. After
applying a novel topographic migration scheme to the GPR data, individual
lithologic units may be mapped. Our results correlate well with observations
at nearby outcrops. They show that 3D GPR surveys are capable of
supplying clear subsurface images in typical paleoseismological trenching
environments. GPR images may be used to guide trenching strategies
aimed at features of special interest to paleoseismology.
Mots-clé
Ground penetrating radar, Reflection
Création de la notice
25/11/2013 19:27
Dernière modification de la notice
20/08/2019 15:33