Unravelling fault structures of the Hamilton Basin.

Francesca Spinardi, Ben Campbell, Vicki Moon, Adrian Pittari, Bethany Fox, Willem de Lange

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Geological and geomorphological mapping provide evidence for three complex fault zones in the Hamilton Basin, an area with no previously mapped surface fault traces. Rectangular drainage patterns, stream knickpoints, and linear ridge and drainage systems all point to structural control on the path of the Waikato River and its tributary gullies. Exposed fault traces indicate significant
splintering of fault planes on encountering the soft sediments and tephras infilling the basin; hence fault zones are wide and characterised by multiple traces forming a complex ridge geomorphology. Steeply dipping normal faults are observed, with relative uplift to the north, indicating a north-south extensional environment. So far, no definitive evidence for movement more recent than 350 ka has been identified
Original languageEnglish
Title of host publicationProceedings of the 20th New Zealand Geotechnical Society Symposium
EditorsG. J. Alexander, C. Y. Chin
Pages121-128
Number of pages8
Publication statusPublished - 2017
Externally publishedYes
EventNew Zealand Geotechnical Society Symposium: What in Earth is Going On? Balancing Risk, Reward and Reality - Napier, New Zealand
Duration: 23 Nov 201726 Nov 2017
Conference number: 20
http://www.nzgs.org/event/nzgs-20th-symposium/ (Link to Conference Information)

Conference

ConferenceNew Zealand Geotechnical Society Symposium
Abbreviated titleNZGS
CountryNew Zealand
CityNapier
Period23/11/1726/11/17
Internet address

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Spinardi, F., Campbell, B., Moon, V., Pittari, A., Fox, B., & de Lange, W. (2017). Unravelling fault structures of the Hamilton Basin. In G. J. Alexander, & C. Y. Chin (Eds.), Proceedings of the 20th New Zealand Geotechnical Society Symposium (pp. 121-128)