scholarly journals Significance of weathering zone in a reverse-dip slope type landslide occurred on a diagenetic zone hard shale : an example of the Honki Slide area in northeastern Hokkaido, Japan

2014 ◽  
Vol 51 (1) ◽  
pp. 13-20
Author(s):  
Hiroyuki MAEDA ◽  
Masanori KOHNO ◽  
Junpei KOTAKE ◽  
Susumu ANDO
Keyword(s):  
Slide Area ◽  
Weathering Zone ◽  
Dip Slope

Resolving pre-collapse slope motion at the February 2021 Chamoli rock-ice avalanche via feature tracking of optical satellite imagery

2021 ◽  
Author(s):  
Maximillian Van Wyk de Vries ◽  
Shashank Bhushan ◽  
David Shean ◽  
Etienne Berthier ◽  
César Deschamps-Berger ◽  
...  
Keyword(s):  
High Resolution ◽  
Satellite Imagery ◽  
Feature Tracking ◽  
Satellite Image ◽  
Image Feature ◽  
Sampling Distance ◽  
Velocity Changes ◽  
The Stability ◽  
Slide Area ◽  
Ice Avalanche

<p>On the 7<sup>th</sup> of February 2021, a large rock-ice avalanche triggered a debris flow in Chamoli district, Uttarakhand, India, resulting in over 200 dead or missing and widespread infrastructure damage. The rock-ice avalanche originated from a steep, glacierized north-facing slope with a history of instability, most recently a 2016 ice avalanche. In this work, we assess whether the slope exhibited any precursory displacement prior to collapse. We evaluate monthly slope motion over the 2015 and 2021 period through feature tracking of high-resolution optical satellite imagery from Sentinel-2 (10 m Ground Sampling Distance) and PlanetScope (3-4 m Ground Sampling Distance). Assessing slope displacement of the underlying rock is complicated by the presence of glaciers over a portion of the collapse area, which display surface displacements due to internal ice deformation. We overcome this through tracking the motion over ice-free portions of the slide area, and evaluating the spatial pattern of velocity changes in glaciated areas. Preliminary results show that the rock-ice avalanche bloc slipped over 10 m in the 5 years prior to collapse, with particularly rapid slip occurring in the summer of 2017 and 2018. These results provide insight into the precursory conditions of the deadly rock-ice avalanche, and highlight the potential of high-resolution optical satellite image feature tracking for monitoring the stability of high-risk slopes.</p>

Uranium distribution and mobility in the weathering zone of the Nisa deposit, Portugal

2018 ◽  
Vol 44 (3) ◽  
pp. 497-512
Author(s):  
C. M. Prazeres ◽  
M. J. Batista ◽  
A. J. Pinto ◽  
M. A. Gonçalves
Keyword(s):  
Uranium Distribution ◽  
Weathering Zone

Composite Geoelectrical Investigation to Delineate Groundwater Feasibility in Hard Rock area of Raipur, Chhattisgarh, India.

2022 ◽  
Vol 9 (1) ◽  
pp. 0-0
Keyword(s):  
Hard Rock ◽  
Geophysical Investigation ◽  
Groundwater Movement ◽  
Indian State ◽  
Subsurface Fractures ◽  
Resistivity Meter ◽  
Integrated Geophysical Survey ◽  
And Storage ◽  
Weathering Zone ◽  
Resistivity Profiling

In hard rock terrains, groundwater movement, migration, and storage occur through subsurface fractures. To assess the fractures and associated water, we carried integrated geophysical investigation with Wenner, (GRP), Schlumberger, and Pole-Dipole array in Indian State. The resistivity survey carried out using a CRM-500 resistivity meter. The analyzed results are also re-verified with the help of IPI2WIN software. Initially, lateral and surface variations of resistivity were plotted by using Wenner and Gradient Resistivity profiling array. Then the low resistivity points were investigated with Schlumberger and Pole-Dipole array. In interpretation, low resistive zones identified correspond to the possible fractured zones. The results allowed mapping of the weathering zone at depth 12 to 15 m, and deep fracture lies below depth 55.0 m depth. The present study validates that the integrated Geophysical survey is a powerful exploration technique to scrutinize and identify water-bearing fractures in the hard rock area.

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