I went to Kaipoi today to look at the trench trough earthquake liquefaction strctures. One of the PhD students is studying them. Here are some pics. We spent a long time looking at the layers of sediment, trying to figure out the history of events recorded.
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| The grey vertical things are called dikes; they fed the material to the surface from down below. Note the rusty colored ones (most easily seen on lower left); They are probably from an 'ancient' earthquake |
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| more of same |
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| Doming of overlying sediment by ancient earthquake - the grey stuff didn't 'rise' enough to reach the surface |
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| Even more of the same :) |
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| sarah cleaning the surface / looking to see what happens to certain layers in three dimensions |
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| Yet even more of same :) |
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| A close up of feeder dike |
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| yet another close-up .... |
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| The street next to the park where the trench is. Note how irregular (and patched-up) the surface is - this is a consequence of the liquefaction and below-srface disruption - all the silt and sand has been removed from the surface because it was a big air pollution hazard. |
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| House across the road from the trench. Boarded up - This is a red-zone area. |
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| Road near park. |
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