I have nothing to add at the high end but would like to claim the SHORTEST section: about 10 micrometers…
Laurich, B., Urai, J.L., Desbois, G., Vollmer, C., Nussbaum, C., 2014. Microstructural evolution of an incipient fault zone in Opalinus Clay: Insights from an optical and electron microscopic study of ion-beam polished samples from the Main Fault in the Mt-Terri Underground Research Laboratory. Journal of Structural Geology 67, 107–128.
kind regards,
Janos
Prof. Dr. Janos L. Urai
Structural Geology, Tectonics and Geomechanics
RWTH Aachen University, Lochnerstrasse 4-20
D-52056 Aachen, Germany
T: +49 241 809 5723 e-mail: [log in to unmask]
www.ged.rwth-aachen.de
> On 26. Jan 2019, at 0442:, Jennifer Roberts <[log in to unmask]> wrote:
>
> This is great! Thanks folks; please do follow up your suggestions / keep the suggestions coming. I’m quite wowed.
> And, though our question was specifically for normal fault + siliclastic sediments, out of curiosity / fun, I happily widen the competition criteria to consider the longest retrieved core drilled through *any* fault zone…
>
> (I feel a blog/article forming…)
>
> Jen
>
> [NB: I am currently on research secondment with CSIRO Energy in Perth, Australia]
> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> Dr Jennifer Roberts
> Research Fellow
> Civil & Env Engineering, University of Strathclyde
> Tel: 0141 5483177; Twitter: @the_JenRoberts
>
> From: Tectonics & structural geology discussion list <[log in to unmask]> on behalf of Elisabeth Nadin <[log in to unmask]>
> Reply-To: Tectonics & structural geology discussion list <[log in to unmask]>
> Date: Saturday, 26 January 2019 at 03:31
> To: "[log in to unmask]" <[log in to unmask]>
> Subject: Re: Longest retrieved core of a fault zone?
>
> In case anyone was dying of curiosity, SAFOD crossed the San Andreas fault at ~3km depth, so that's how deep that hole went.
> (I know, not a normal fault)
> you can view some of it online:
> https://iodp.tamu.edu/curation/gcr/safod/
>
>
> ---------------------------------------------
> Elisabeth Nadin
> Associate Professor
> Dept. of Geosciences
> University of Alaska Fairbanks
> 1930 Yukon Drive
> Fairbanks, AK 99775-5780
> ---------------------------------------------
>
>
> On Fri, Jan 25, 2019 at 3:27 AM Chris Elders <[log in to unmask]<mailto:[log in to unmask]>> wrote:
> And in the thrust fault category, let’s not forget the very exciting project that is currently underway with the Chikyu - IODP Expedition 358 - to drill through the boundary between the Eurasian and Philippine Sea Plate - part of the Nankai Trough Seismogenic Zone Experiment: https://www.jamstec.go.jp/chikyu/e/nantroseize/expedition_358.html
>
> Chris
>
>
> Chris Elders
> Professor of Petroleum Geology
> School of Earth and Planetary Sciences
> Faculty of Science and Engineering
>
> Curtin University
> Tel | +61 8 9266 1168
> Mobile | 0474 204 359
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> Email | [log in to unmask]<mailto:[log in to unmask]>
> Web | http://curtin.edu.au<http://curtin.edu.au/>
>
>
>
> [cid:168865454264cff311]
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>
>
> On 25 Jan 2019, at 18:43, Tim Needham <[log in to unmask]<mailto:[log in to unmask]>> wrote:
>
> Hi Jen
>
> Oilfield core tends to be restricted to the reservoir (you would hope!) and the wells attempt to avoid faults. Fortunately for us the latter condition isn't always met. In looking at a few hundred cored wells down the years I'd start off by suggesting cores from Bruce field (Jurassic clastics), particularly wells 9/9b-2B, 9/9a-8, 9/9b-3 and 9/9b-9. These may not win the quantity award but are all highly faulted. All cores, excepting 9/9b-2B (73m), are >100m in length. Core from well 22/29-3 (Triassic) is also good but not >100m. Core photos should be accessible via the BGS website. There are some Norwegian wells that would fit the bill too but I'm not sure if they're released. If they are, photos should be available via the NPD website. I'll check and let you know the wells. All of these may be regarded as quality over quantity! In the longer wells it is usual to see clusters of faults and it isn't always clear whether these represent different fault zones or clusters within a single, wider damage zone.
> Happy hunting!
>
> Tim
> ---------------------------------------------------------------------------
> Dr Tim Needham
> Needham Geoscience Limited
> 10 Ghyll Wood
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>
> -----Original Message-----
> From: Tectonics & structural geology discussion list <[log in to unmask]<mailto:[log in to unmask]>> On Behalf Of Jennifer Roberts
> Sent: 25 January 2019 07:17
> To: [log in to unmask]<mailto:[log in to unmask]>
> Subject: Longest retrieved core of a fault zone?
>
> Dear Geotectonics Community,
>
> Out of general and research interest, and also for geoscience communication purposes, we wanted to tap into your collective knowledge of drilling and coring of fault zones around the world to help us to answer the following question:
> To date, what is the longest section of ~fully recovered core retrieved from a borehole drilled through a normal fault zone in clastic sediments?
>
> We are trying to identify the 'world record'. However, we do realise that there could be multiple winners (apparent fault zone thickness, actual fault zone thickness, onshore, offshore, and so on and so forth).
>
> Thanks in advance for your insights,
>
> Jen Roberts (University of Strathclyde) and Julian Strand (CSIRO)
>
> [NB: I am currently on research secondment with CSIRO Energy in Perth, Western Australia]
> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> Dr Jennifer Roberts
> Research Fellow
> Civil & Env Engineering, University of Strathclyde
> Tel: 0141 5483177; Twitter: @the_JenRoberts
>
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