Complex internal architecture of a debris-flow deposit revealed using ground-penetrating radar, Cass, New Zealand

2013 ◽  
Vol 69 (1) ◽  
pp. 26-38 ◽  
Author(s):  
Colette C.A. Starheim ◽  
Christopher Gomez ◽  
Justin Harrison ◽  
Claire Kain ◽  
Nicholas J. Brewer ◽  
...  
Keyword(s):  
New Zealand ◽  
Debris Flow ◽  
Ground Penetrating Radar ◽  
Debris Flow Deposit ◽  
Flow Deposit ◽  
Ground Penetrating ◽  
Internal Architecture

The 55- to 60-ka Te Whaiau Formation: a catastrophic, avalanche-induced, cohesive debris-flow deposit from Proto-Tongariro Volcano, New Zealand

2001 ◽  
Vol 63 (8) ◽  
pp. 509-525 ◽  
Author(s):  
Jérôme A. Lecointre ◽  
Vincent E. Neall ◽  
Cleland R. Wallace ◽  
Warwick M. Prebble
Keyword(s):  
New Zealand ◽  
Debris Flow ◽  
Debris Flow Deposit ◽  
Flow Deposit

Huge, CO2-charged debris-flow deposit and tectonic sagging in the northern plains of Mars

Geology ◽  
2001 ◽  
Vol 29 (5) ◽  
pp. 427 ◽  
Author(s):  
Kenneth L. Tanaka ◽  
W. Bruce Banerdt ◽  
Jeffrey S. Kargel ◽  
Nick Hoffman
Keyword(s):  
Debris Flow ◽  
Northern Plains ◽  
Debris Flow Deposit ◽  
Flow Deposit

scholarly journals Assessing Ground Penetrating Radar's Ability to Image Subsurface Characteristics of Icy Debris Fans in Alaska and New Zealand

2018 ◽  
Vol 23 (4) ◽  
pp. 423-436 ◽  
Author(s):  
Robert W. Jacob ◽  
Jeffrey M. Trop ◽  
R. Craig Kochel
Keyword(s):  
New Zealand ◽  
Ground Penetrating Radar ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Glacial Ice ◽  
Signal Velocity ◽  
Alpine Regions ◽  
Flow Processes ◽  
Ground Penetrating ◽  
Antenna Polarization

Icy debris fans have recently been described as fan shaped depositional landforms associated with (or formed during) deglaciation, however, the subsurface characteristics remain essentially undocumented. We used ground penetrating radar (GPR) to non-invasively investigate the subsurface characteristics of icy debris fans (IDFs) at McCarthy Glacier, Alaska, USA and at La Perouse Glacier, South Island of New Zealand. IDFs are largely unexplored paraglacial landforms in deglaciating alpine regions at the mouths of bedrock catchments between valley glaciers and icecaps. IDFs receive deposits of mainly ice and minor lithic material through different mass-flow processes, chiefly ice avalanche and to a lesser extent debris flow, slushflow, and rockfall. We report here on the GPR signal velocity observed from 15 different wide-angle reflection/refraction (WARR) soundings on the IDFs and on the McCarthy Glacier; the effect of GPR antenna orientation relative to subsurface reflections; the effect of spreading direction of the WARR soundings relative to topographic contour; observed differences between transverse electric (TE) and transverse magnetic (TM) antenna polarization; and a GPR profile extending from the McCarthy Glacier onto an IDF. Evaluation of the WARR soundings indicates that the IDF deposits have a GPR signal velocity that is similar to the underlying glacier, and that the antenna polarization and orientation did not prevent identification of GPR reflections. The GPR profile on the McCarthy Glacier indicates that the shallowest material is layered, decreases in thickness down fan, and has evidence of brittle failure planes (crevasses). The GPR profile and WARR soundings collected in 2013 indicate that the thickness of the McCarthy Glacier is 82 m in the approximate middle of the cirque and that the IDF deposits transition with depth into flowing glacial ice.

Sign in / Sign up

Export Citation Format

Share Document