Landslides in a Changing Climate

The Oso landslide in Washington state is the subject of research to better understand the likelihood of this kind of event happening again. A team of scientists from the University of Washington has published a new study concluding that the deadliest landslide in US history, which killed more than 40 people in Oso , Washington , was not a fluke. In fact, they estimated that over the past 2, years, the same stretch of valley has been slammed by a major slide every years, on average. Using lidar images, the scientists zoomed in on old slides and quantified how rough their surfaces were. Then they compared slides of known ages to slides of unknown ages to come up with an approximate scale. I am looking for particular applications for monitoring of geo-hazards along a pipeline Right of Way. Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email. This site uses Akismet to reduce spam.

Dating Landslides with Lichen

McCalpin and A. Nelson, Introduction to Paleoseismology. The Scope of Paleoseismology. Prehistoric Earthquake Recurrence and Dating. Estimating the Magnitude of Prehistoric Earthquakes. The Early Development of Paleoseismology.

More recently is good for dating, wood and plant fibers that of organic material. What can radiocarbon dating landslides, we are able to date older material.

Most of us have seen splotchy lichens clinging to rocks, trees and maybe even the ground, but did you know that you can date landslides with lichens? Lichens grow only. This technique has been used to date historic earthquakes that may have caused landslides. While lichens are a relatively new tool in geologic applications, there have been numerous uses of lichens by humans for centuries. Ethnolichenology is the study of how humans have used lichens in making dyes, in medicine and even as a food.

The use of lichens in traditional medicine is extensive in many cultures.


Colin K. Sandeman, Sheng Xu. Little is known of hard-rock coastal landsliding in Scotland.

Our approach to the timing and linkage of giant submarine landslides and Molokai and other southern Hawaiian Islands, tentatively dated at + and +.

Toggle navigation. Have you forgotten your login? Journal articles. Zerathe 1 T. Lebourg 1 Regis Braucher 2 D. Bourles 2 Details. Zerathe 1 AuthorId : Author. Lebourg 1 AuthorId : Author. Hide details. Abstract : Although it is generally assumed that the internal structure of a slope e. Highlighting in this study the spatial and temporal concordant clustering of deep-seated slope failures in the external Southwestern Alps, we discuss and review the possible causes for such wide-spread slope instabilities at both local and larger Alpine scale.

We show that they developed in the same geostructural context of thick mudstone layers overlain by faulted limestone and followed a block-spread model of deformation that could evolve in rock-collapse events.

A Submerged Forest

The Flims rockslide happened about 10, years ago BC in eastern Switzerland. The town of Flims can be found at the line where the slip surface disappears under the debris. South of Flims is a huge hilly debris area that has been forest ever since, as this area is not suitable for farming , firstly for its shape and, even more for its lack of water. The river Rhine crosses this debris in a gorge called Ruinaulta.

Landslides, lake sediments and paleo-earthquakes, GNS Science coring of sediments, further cosmogenic dating of the landslides and study of the activity.

Those are key conclusions of a new University of Utah study that provides the first definitive date for the landslide and estimates its size and dynamics, including a speed likely as fast as mph. The huge landslide had a volume of million cubic meters or Computer simulations matched known landslide deposits and show the huge slide rushed southeast across Zion Canyon in about 20 seconds, with an average speed of mph and a peak speed of to mph. Then, for 30 more seconds, the slide debris spread up and down Zion Canyon.

More than 3. The other aspect is the extreme hazard that a similar event would pose if it happened today. The 4,year-old landslide deposit still produces many smaller slides, including one in that damaged the road between the visitor center and the lodge, Moore says. Volunteer Scott Castleton and University of Utah geologist Jeff Moore collect rock samples from boulders for a new study that provides the first direct date — 4, years ago — for a a gargantuan landslide in what is now Zion National Park, Utah.

Because of their large volume, they are relatively rare. Some people initially thought Zion Canyon was flat because of glacial debris, like Yosemite Valley in California.

How a huge landslide shaped Zion National Park

My research focuses on rock slope stability and integrates neotectonics, paleoseismology, Quaternary landscape development and the technical and societal responds to landslide threat. Research topics include:. A selection of recent journal publications, artistic productions, books, including book and report excerpts. See all publications in the database. Reginald Hermanns.

() describe an ancient landslide at Xuelongnang in Tibet. This rockslide blocked the Jinsha River, creating a lake. The dating suggests that.

The Blackhawk landslide is best known as an example to support a number of hypotheses regarding large volume landslide mechanics. Surprisingly, there is little dating control on the timing of the landslide. This page briefly outlines our approach to determine the timing of landsliding by using surface exposure age dating. The Blackhawk landslide is a granular slide that sourced in the San Bernardino Mountains.

The runout zone is approximately 3 km wide by 10 km long. The runout is particularly long compared to the drop relief.

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A catastrophic landslide, one of the largest known on the surface of the Earth, took place within minutes in southwestern Utah more than 21 million years ago, reported a Kent State University geologist in a paper published in the November issue of the journal Geology. The Markagunt gravity slide, the size of three Ohio counties, is one of the two largest known continental landslides larger slides exist on the ocean floors.

David Hacker, Ph. His colleagues and co-authors are Robert F. Rowley of Geologic Mapping, Inc. Geologists had known about smaller portions of the Markagunt slide before the recent mapping showed its enormous extent.

Report Title: Report on the Dating of Natural Terrain Landslides in Hong Relative ages of relict landslide clusters can be suggested by Aerial.

William T. Struble, Joshua J. Roering, Bryan A. Black, William J. GSA Bulletin ; : — Large-magnitude earthquakes and hydrologic events in mountainous settings commonly trigger thousands of landslides, and slope failures typically constitute a significant proportion of the damage associated with these events. Large, dormant deep-seated landslides are ubiquitous in the Oregon Coast Range, western United States, yet a method for calculating landslide ages with the precision required to diagnose a specific triggering event, including the A.

Establishing a compelling connection between prehistoric slope instability and specific triggers requires landslide ages with precision greater than that provided by 14 C dating of detrital materials. Tree-ring analysis is the only known method capable of determining landslide age with this precision. We cross-dated tree-ring indices from drowned Douglas fir trees with live tree-ring records from the Oregon Coast Range that exhibit synchronous, time-specific patterns due to regional climate variations.

Our analyses determined that the landslides responsible for creating Wasson and Klickitat Lakes occurred in A. The 14 C dates from selected tree rings and landslide deposit detritus are consistent with our tree-ring analysis, although the ages exhibit high variability, revealing the limitations of using 14 C dating alone. Because dendrochronology provides annual precision for landsliding, sampling of tree rings at additional landslide-dammed lakes throughout the Oregon Coast Range can be used to constrain the potential effects of ground motion and major storms on Cascadia landscapes.

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Techniques and methods in landslide mapping

With a wave runup of nearly metres, the tsunami that ripped through an Alaskan fjord in was one of the largest ever documented. But with no-one killed, it almost went unnoticed. The tsunami generated a wave runup, the maximum vertical extent of wave uprush on a beach, of metres feet.

Citazione: Crosta, G., & Clague, J.J. (). dating, triggering, modelling, and hazard assessment of large landslides; landslides; engineering geology;.

The purpose of this study is to explore and illustrate the potential of exposed roots to reconstruct larger-scale landslide activity and thus to complement tree-ring data gathered from stems to reconstruct spatio-temporal patterns of landslide reactivation. The study demonstrates that reconstructions of landslide reactivations obtained from exposed roots samples are not significantly different from those gathered from stems, but that the inclusion of exposed roots permits realization of frequency maps in sectors which could not be documented with classic dendrogeomorphic approaches focusing on tree-ring records from stems scars, cracks.

In addition, and even more importantly, the inclusion of exposed roots allowed assessment of the geomorphic evolution of the landslide at the local scale and to detect precursor signals of major reactivations in the form of crack widening before the main movement was registered in the tree stems. In that sense, the combined approach presented in this paper can be considered as a valuable tool for land-use planners and emergency cells in charge of forecasting future events and in protecting people and their assets from the negative effects of landslides.

As a consequence, their occurrence has recently become a topic of major interest for both researchers and local administrators, especially in terms of landslide hazard and risk assessments Magliulo et al. The steadily growing interest in landslides certainly reflects the increasing awareness of the socio-economic significance of the process Aleotti and Chowdhury, but also indicates quite clearly that human pressure on the environment is becoming ever more important for land development and urbanization Petrascheck and Kienholz, An appropriate assessment of existing and potential future landslide hazards becomes a prerequisite for a sustainable land-use, but requires, among others, a detailed determination of the spatial and temporal occurrences of landslides at the site level.

However, major obstacles normally exist to obtain this kind of data, mainly due to the lack of reliable historical records on the frequency and localization of past events Aleotti and Chowdhury, As a consequence, past research on landslides focused more on their susceptibility see Guzzetti, , and references therein for a review rather than on the documentation of landslide hazards at the level of individual sites.

As trees suffering from superficial and slow movements may survive reactivations and thus conserve the evidence of tree topping, tilting or S-shaped stems and scars in their increment series Carrara and O’Neill, ; Stefanini, , spatial and temporal patterns of past landsliding can be dated using tree-ring samples from stem. Previous studies using increment rings in exposed roots root rings focused primarily on the quantification of i long-term aerial denudation rates e.

In their recent review paper, Stoffel et al. B: View of the main scarp SC1, dotted line and of the landslide body.

Death Toll Rises to 19 in Yunnan Landslide