Icequakes and glacier motion: The hans glacier,spitsbergen |
| |
| Authors: | Artur Cichowicz |
| |
| Institution: | (1) Institute of Geophysics, Polish Academy of Sciences, Pasteura 3, 00-973 Warsaw, Poland |
| |
| Abstract: | The recording of glacier icequakes has been carried out on the Hans glacier, Spitsbergen. The icequakes have been connected
with the formation of open cracks. The energy of the main group of icequakes has ranged from 0.01 J to 6 J, their seismic
moment being from 0.5 · 1014 dyne · cm to 26 · 1014 dyne · cm. The nonelastic volume increase corresponding to each crack has ranged from 0.2 · 10−2 m3 to 8.8 · 10−2 m3. The stresses released due to extensional faulting ranged from 25N/m2 to 500 N/m2; these values are so small that they suggest an incomplete release of the medium. The contribution into the glacier flow
rate of the deformation in the surface glacier layer due to extensional faulting is lower by 2 to 3 orders of magnitude than
the total plastic deformation associated with the ice creeping. |
| |
| Keywords: | Icequake Tensile fracture |
| 本文献已被 SpringerLink 等数据库收录！ |
|
