Hodge, Michael ![]() ![]() |
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Abstract
We use the ~110 km long Bilila‐Mtakataka fault in the amagmatic southern East African Rift, Malawi, to investigate the controls on early‐rift geometry at the scale of a major border fault. Morphological variations along the 14±8 m high scarp define six 10‐40 km long segments, which are either foliation parallel, or oblique to both foliation and the current regional extension direction. As the scarp is neither consistently parallel to foliation, nor well oriented for the current regional extension direction, we suggest the segmented surface expression is related to the local reactivation of well oriented weak shallow fabrics above a broadly continuous structure at depth. Using a geometrical model, the geometry of the best‐fitting subsurface structure is consistent with the local strain field from recent seismicity. In conclusion, within this early‐rift, pre‐existing weaknesses only locally control border fault geometry at subsurface.
Item Type: | Article |
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Date Type: | Published Online |
Status: | Published |
Schools: | Earth and Environmental Sciences |
Subjects: | Q Science > QE Geology |
Publisher: | American Geophysical Union (AGU) |
ISSN: | 0094-8276 |
Date of First Compliant Deposit: | 26 April 2018 |
Date of Acceptance: | 10 April 2018 |
Last Modified: | 06 Nov 2023 17:19 |
URI: | https://orca.cardiff.ac.uk/id/eprint/110878 |
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