Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B32020.1 |
Drivers of earthflow motion revealed by an 80 yr record of displacement from Oak Ridge earthflow, Diablo Range, California, USA | |
Nereson, Alexander L.; Finnegan, Noah J. | |
2019-03-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2019 |
卷号 | 131页码:389-402 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Predicting the velocity of slow landslides over multidecadal time scales requires an understanding of the potential drivers of landslide motion, analytical frameworks or models that connect those drivers to kinematic response, and historical records of movement that have sufficient spatial and temporal resolution to test model predictions. Given that detailed long-term records of slow landslide movement are still relatively uncommon, we used a time series of aerial imagery to assemble an 80 yr (1937-2017) record of movement for the Oak Ridge earthflow, a slow-moving landslide in California's northern Diablo Range. Landslide movement was unsteady and nonuniform during this period. We used this history of movement, visual evidence from imagery and the field, and a record of surface moisture balance (the Palmer Drought Severity Index) to evaluate the relative roles of possible drivers of movement. Drivers considered included: supply of mobile regolith from the landslide source zone, fluvial debuttressing from below, changes in climate forcing over time, and changes in failure plane orientation in space. Specifically, we found that spatial patterns of earthflow velocity within the transport zone, where the bulk of movement occurred, were controlled largely by the slope of the underlying failure plane, whereas temporal patterns were governed largely by climate-driven changes in surface moisture balance (PDSI) at the annual-decadal scale. Declines in sediment supply acted as a secondary control on temporal velocity variations over our study period; however, the influence of this driver likely grows at longer time scales. Evidence for transient waves of motion in response to fluvial debuttressing was limited to the toe, and continued monitoring of Oak Ridge earthflow is required to determine whether those perturbations in sediment flux will migrate further upslope. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000460031700003 |
WOS关键词 | NONUNIFORM LANDSLIDE MOTION ; PORE-PRESSURE FEEDBACK ; SEASONAL MOVEMENT ; EEL RIVER ; DEFORMATION ; KINEMATICS ; EVOLUTION ; DYNAMICS ; UNSTEADY ; RAINFALL |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25139 |
专题 | 地球科学 |
作者单位 | Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95060 USA |
推荐引用方式 GB/T 7714 | Nereson, Alexander L.,Finnegan, Noah J.. Drivers of earthflow motion revealed by an 80 yr record of displacement from Oak Ridge earthflow, Diablo Range, California, USA[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2019,131:389-402. |
APA | Nereson, Alexander L.,&Finnegan, Noah J..(2019).Drivers of earthflow motion revealed by an 80 yr record of displacement from Oak Ridge earthflow, Diablo Range, California, USA.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,131,389-402. |
MLA | Nereson, Alexander L.,et al."Drivers of earthflow motion revealed by an 80 yr record of displacement from Oak Ridge earthflow, Diablo Range, California, USA".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 131(2019):389-402. |
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