Tracking the Cracking: A Holistic Analysis of Rapid Ice Shelf Fracture Using Seismology, Geodesy, and Satellite Imagery on the Pine Island Glacier Ice Shelf, West Antarctica

被引：9
|
作者：
Olinger, S. D. [1 ,2 ]
Lipovsky, B. P. [2 ]
Denolle, M. A. [2 ]
Crowell, B. W. [2 ]
机构：
[1] Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA
[2] Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2022年 / 49卷 / 10期
基金：
美国国家科学基金会; 美国国家航空航天局;
关键词：
ice shelf fracture; Pine Island Glacier; rifting; calving; RIFT PROPAGATION; WAVES; SEISMICITY; ICEQUAKES; SURFACE; MODEL;
D O I：
10.1029/2021GL097604
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Ice shelves regulate the stability of marine ice sheets. We track fractures on Pine Island Glacier, a quickly accelerating glacier in West Antarctica that contributes more to sea level rise than any other glacier. Using an on-ice seismic network deployed from 2012 to 2014, we catalog icequakes that dominantly consist of flexural gravity waves. Icequakes occur near the rift tip and in two distinct areas of the shear margin, and TerraSAR-X imagery shows significant fracture in each source region. Rift-tip icequakes increase with ice speed, linking rift fracture to glaciological stresses and/or localized thinning. Using a simple flexural gravity wave model, we deconvolve wave propagation effects to estimate icequake source durations of 19.5-50.0 s and transient loads of 3.8-14.0 kPa corresponding to 4.3-15.9 m of crevasse growth per icequake. These long-source durations suggest that water flow may limit the rate of crevasse opening.
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页数：11
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