Regional characterization of large landslides in southwest Yukon, with emphasis on the role of neotectonics
department or school: Science, Faculty of
department or school: Earth, Ocean and Atmospheric Sciences, Department of
data provider: DSpace
degree campus: UBCV
creator: Everard, Keith Alan
issued: 2009-01-09T19:47:44Z
issued: 1994
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Neotectonics may be defined as any recent movement or deformation at or near the earth's surface, and the associated geological processes or mechanisms thereof (Vita-Finzi 1986). A regional study of large landslides was undertaken in southwest Yukon, with the aim of assessing the relationship between large landslides and neotectonic processes, with particular emphasis on the role of seismicity. Landslides were inventoried in an area covering 18,800 km² in southwest Yukon and 4,400 km² in adjacent south-eastern Alaska. Their spatial distribution was found to correlate with certain lithological units, regional faults, and often dense clusters of low-level earthquakes. Seismicity is especially intense in the Cement Creek area, where the relative temporal distribution of landslides departs from the regional slope exhaustion model and more closely resembles a steady-state distribution. A recent (1983) landslide in this area was attributed to a modest M5.4 earthquake (Power 1988). Field reconnaissance in Cement Creek valley was undertaken to assess the possible role of neotectonic processes, and to gather data for a program of numerical modelling. Rupture surfaces of the landslides were generally coincident with bedding surfaces in the tightly folded volcanic rocks. Geomorphic evidence suggests an incremental displacement failure mechanism. The available methods of dynamic numerical modelling are reviewed. Program UDEC is found to be an appropriate analytical package for the modelling program. Limited verification tests of UDEC were performed. Strong motion data from a magnitude 4.6 earthquake were input successively to a representative slope model. The program was able to simulate geomorphic features related to slope deformation at Cement Creek, as well as confirming seismicity as a possible landslide triggering mechanism.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/3470
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note: REGIONAL CHARACTERIZATION OF LARGE LANDSLIDES IN SOUTHWEST YUKON, WITH EMPHASIS ON THE ROLE OF NEOTECTONICS by KEITH A L A N EVERARD B.A.Sc , The University of British Columbia, 1989 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE FACULTY OF GRADUATE STUDIES (Department of Geological Sciences) (Geological Engineering Programme) We accept this thesis as conforming to the required standard THE UNIVERSITY OF BRITISH COLUMBIA December 1994 © Keith Alan Everard, 1 9 9 4 In presenting this thesis in partial fulfilment of the requirements for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission. Department of Gi=oi_ocbicAi Q C I E M C ^ S The University of British Columbia Vancouver, Canada Date D E C F H ^ R 'XS , l<m DE-6 (2/88) ABSTRACT Neotectonics may be defined as any recent movement or deformation at or near the earth's surface, and the associated geological processes or mechanisms thereof (Vita-Finzi 1986). A regional study of large landslides was undertaken in southwest Yukon, with the aim of assessing the relationship between large landslides and neotectonic processes, with particular emphasis on the role of seismicity. Landslides were inventoried in an area covering 18,800 km 2 in southwest Yukon and 4,400 km 2 in adjacent south-eastern Alaska. Their spatial distribution was found to correlate with certain lithological units, regional faults, and often dense clusters of low-level earthquakes. Seismicity is especially intense in the Cement Creek area, where the relative temporal distribution of landslides departs from th…
has type: Thesis/Dissertation
date issued: 1995-05
is shown at: 10.14288/1.0052859
language: eng
degree discipline: Geological Sciences
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/3470