seismic-observations-of-crevasse-growth-following-rain-induced-glacier-acceleration-haupapatasman-glacier-new-zealand.pdf (656.5 kB)

Seismic observations of crevasse growth following rain-induced glacier acceleration, Haupapa/Tasman Glacier, New Zealand

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posted on 06.03.2021, 20:49 by S Taylor-Offord, Huw Horgan, John Townend, JP Winberry
Copyright © The Author(s) 2019 This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.. Changing rates of water input can affect both the flow of glaciers and ice sheets and their propensity to crevasse. Here we examine geodetic and seismic observations during two substantial (10-18-times background velocity) rain-induced glacier accelerations at Haupapa/Tasman Glacier, New Zealand. Changes in rain rate result in glacier acceleration and associated uplift, which propagate down-glacier. This pattern of acceleration results in a change to the strain rate field, which correlates with an order of magnitude increase in the apparent seismicity rate and an overall down-glacier migration in located seismicity. After each acceleration event the apparent seismicity rate decreases to below the pre-acceleration rate for 3 days. This suggests that seismic events associated with surface crevasse growth occur early during phases of glacier acceleration due to elevated extensional stresses, and then do not occur again until stresses recover.

History

Preferred citation

Taylor-Offord, S., Horgan, H., Townend, J. & Winberry, J. P. (2019). Seismic observations of crevasse growth following rain-induced glacier acceleration, Haupapa/Tasman Glacier, New Zealand. Annals of Glaciology, 60(79), 14-22. https://doi.org/10.1017/aog.2019.20

Journal title

Annals of Glaciology

Volume

60

Issue

79

Publication date

01/09/2019

Pagination

14-22

Publisher

Cambridge University Press (CUP)

Publication status

Published

Online publication date

30/05/2019

ISSN

0260-3055

eISSN

1727-5644

Language

en