Viscosity and finite strength of the mantle as determined from water and ice loads
Geophysical Journal International
By: Max D. Crittenden Jr.
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Abstract
Some recent examples of transient Earth loads (Lake Bonneville, Utah; Glacier Bay, Alaska; northeast Greenland) indicate that both the viscosity and finite strength of the mantle are lower than is commonly presumed. A time constant (1/e) of 4000 years is estimated for Lake Bonneville, and of 1000 years for northeast Greenland. A strain rate of 10−14 is typical. These figures imply viscosities in a homogeneous half space ranging from 1020 to 1021 poises.
An upper limit of finite strength is set by Lake Bonneville at a few times 106 dyn/cm2. If mountain ranges like the Sierra Nevada or Himalaya are regarded as dynamically supported rather than static systems, this low value is not incompatible with other geologic observations.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Viscosity and finite strength of the mantle as determined from water and ice loads |
| Series title | Geophysical Journal International |
| DOI | 10.1111/j.1365-246X.1967.tb06243.x |
| Volume | 14 |
| Issue | 1-4 |
| Publication Date | January 26, 2010 |
| Year Published | 1967 |
| Language | English |
| Publisher | Oxford Academic |
| Description | 19 p. |
| First page | 261 |
| Last page | 279 |
| Country | Greenland, United States |
| State | Alaska, Utah |
| Other Geospatial | Glacier Bay, Lake Bonneville, Mesters Vig |