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  Seismic constraints on rock damaging related to a failing mountain peak: the Hochvogel, Allgäu

Dietze, M., Krautblatter, M., Illien, L., Hovius, N. (2021): Seismic constraints on rock damaging related to a failing mountain peak: the Hochvogel, Allgäu. - Earth Surface Processes and Landforms, 46, 2, 417-429.
https://doi.org/10.1002/esp.5034

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5003979 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5003979_7
Genre: Journal Article

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Dietze, Michael1, Author              
Krautblatter, M.2, Author
Illien, Luc1, Author              
Hovius, Niels1, Author              
Affiliations:
14.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146045              
2External Organizations, ou_persistent22              

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 Abstract: Large rock slope failures play a pivotal role in long‐term landscape evolution and are a major concern in land use planning and hazard aspects. While the failure phase and the time immediately prior to failure are increasingly well studied, the nature of the preparation phase remains enigmatic. This knowledge gap is due, to a large degree, to difficulties associated with instrumenting high mountain terrain and the local nature of classic monitoring methods, which does not allow integral observation of large rock volumes. Here, we analyse data from a small network of up to seven seismic sensors installed during July–October 2018 (with 43 days of data loss) at the summit of the Hochvogel, a 2592 m high Alpine peak. We develop proxy time series indicative of cyclic and progressive changes of the summit. Modal analysis, horizontal‐to‐vertical spectral ratio data and end‐member modelling analysis reveal diurnal cycles of increasing and decreasing coupling stiffness of a 260,000 m3 large, instable rock volume, due to thermal forcing. Relative seismic wave velocity changes also indicate diurnal accumulation and release of stress within the rock mass. At longer time scales, there is a systematic superimposed pattern of stress increased over multiple days and episodic stress release within a few days, expressed in an increased emission of short seismic pulses indicative of rock cracking. Our data provide essential first order information on the development of large‐scale slope instabilities towards catastrophic failure.

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 Dates: 20202021
 Publication Status: Finally published
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 Identifiers: DOI: 10.1002/esp.5034
GFZPOF: p4 T3 Restless Earth
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Title: Earth Surface Processes and Landforms
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 46 (2) Sequence Number: - Start / End Page: 417 - 429 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals103
Publisher: Wiley