View from Mt Roberts: Speargrass Valley, NZ

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Comments (6)

very nice

like1

Greetings from IRAN

    Mahmood
bdeh on May 22, 2011

Nice sky with clouds Ian. Give the picture something more. Greetings Berend

Ian Stehbens on May 22, 2011

Thank you Mahmood. It is great to share with you, and also to send you warm greetings from Australia and NZ.

Ian

Ian Stehbens on May 23, 2011

I believe this was mostly cleared for grazing once, but it has ben reforested. I found this landscape very interesting Berend, because of the faulting and therefore there were some unexpected valley alignments, landslide dammed lakes, and odd steep angles of valley sides.

This is one of those valleys, that are much higher on one side than the other because the streams (or previously glaciers) follow the lines of the faults rather than the regional gradients.

I hope that makes some sense, and helps to explain the odd form of this valley.

Regards,

Ian

bdeh on May 23, 2011

Your explanation maked sense Ian. Thanks, greetings Berend

Ian Stehbens on May 24, 2011

A little more on the tecytonic activity around here, Berend. Generally the earthquakes that are centred in this area are quite deep ones, whereas the Christchurch quakes and aftershocks were very shallow.

The biggest quake in this area (The Murchison Quake) occurred in 1929 and the epicentre was about 60 kms NW of this scene (to the right). It produced about 4.5 M of vertical movement and 2.5 M of lateral movement. Such displacement is still very evident in the landscape. I had a good look at it where the tear fault crosses the Buller River about 30kms west from here.

Greetings,

Ian

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  • Uploaded on May 21, 2011
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    by Ian Stehbens

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