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  • 1
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    Geotechnical characterization of trench- and slope sediments off Southern Chile: preliminary results (2010)
    Universitätsverlag Göttingen
    Details
    Publication Date: 2021-03-29
    Description: To understand seismogenesis in shallow parts of subduction zones, it is vital to know about strength and frictional parameters of subducted sediment. For this purpose, PETROTEC, as part of the TIPTEQ-Project, gathers geotechnical data for sediments deposited on the incoming Nazca Plate, the trench and the slope off the southern Chilean coast during the last 5 Ma, and whose equivalents are now being underthrusted into the seismogenic zone beneath South America. Material comes from gravity cores collected during R/V SONNE Cruises SO181 (Flüh E. & Grevemeyer I (Editors) 2005), SO102 (Hebbeln D, Wefer G, et al. 1995) and SO156 (Hebbeln D, et al. 2001), as well as from ODP Leg 141 (Behrmann JH, et al. 1992) drill cores. Sediment strength and frictional properties are determined by triaxial testing, ring shear testing and direct shear testing...
    Description: conference
    Keywords: 551 ; VAT 210 ; VBP 100 ; VBP 400 ; VAE 130 ; VKB 311 ; Untersuchungsverfahren mariner Sedimente {Geologie} ; Methodik, Untersuchungsverfahren und Instrumente {Ingenieurgeologie} ; Felsmechanik, Gebirgsmechanik, Gebirgsdruck ; Geomechanik ; Untersuchungsmethoden und Probennahme im Gelände {Sedimentologie} ; Chile ; Kontinentalrand ; Konturit ; Gesteinsmechanik
    Language: German
    Type: anthologyArticle , publishedVersion
    Format: application/pdf
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    CITATION GEO-LEO
  • 2
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    Observations of Laboratory and Natural Slow Slip Events: Hikurangi Subduction Zone, New Zealand (2021)
    Details
    Publication Date: 2021-07-21
    Description: Slow slip events (SSEs) are recognized as an important component of plate boundary fault slip, and there is a need for laboratory friction data on natural samples to guide comparisons with natural SSEs. Here, we compile a comprehensive catalog of SSEs observed geodetically at the Hikurangi subduction zone offshore northern New Zealand, and compare it with results of laboratory friction experiments that produce laboratory SSEs under plate tectonic driving rates (5 cm/yr). We use samples from Ocean Drilling Program Site 1124 seaward of the Hikurangi subduction zone to represent the plate boundary that hosts shallow SSEs at Hikurangi. We find that laboratory SSEs exhibit a similar displacement record and range of stress drops as the natural SSEs. Results of velocity step tests, which can be used to evaluate frictional instability based on the critical stiffness criterion, indicate that the slow slip activity at Hikurangi is a form of stably-accelerating slip. Our laboratory SSEs provide an alternative method of quantifying (in)stability by direct measurement of the unloading stiffness during the stress drop. The observed dependence of laboratory SSE parameters on effective normal stress is consistent with critical stiffness theory; however, depth-increasing projections based on laboratory data do not match observations from natural SSEs. These differences are likely related to changing temperature and fault rock composition downdip but also complications related to scaling and/or limited sampling. Scientific drilling recently undertaken at the Hikurangi subduction zone should serve to improve and guide future studies of the role of frictional properties for the occurrence of SSEs.
    Keywords: 551.8 ; Hikurangi ; slow slip ; subduction zone ; friction ; GPS ; fault
    Language: English
    Type: article
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    CITATION GEO-LEO
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