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Deep Short-term Slow Slip and Tremor in the Manawatu Region, New Zealand
  • Shannon Lee Fasola,
  • Noel McCay Jackson,
  • Charles A. Williams
Shannon Lee Fasola
University of Kansas

Corresponding Author:[email protected]

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Noel McCay Jackson
University of Kansas
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Charles A. Williams
GNS Science
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The Manawatu region experiences deep tremor and long-term SSEs; however tremor is adjacent to, and not co-located with, long-term SSEs. Observations of Episodic tremor and Slip (ETS) elsewhere suggest it is possible smaller short-term SSEs below the current detection threshold occur where tremor is observed. Therefore, we sought to determine if small SSEs occurred with Manawau tremor. We decomposed GNSS data using times of tremor to assess average surface displacements and performed a static slip inversion to model the displacement during tremor. The slip inversion suggested small slow slip partially coincided with tremor and long-term SSEs may influence these small SSEs by increasing slip rates. We suggest that the interface below deep long-term SSEs may slip often, in small ETS-like SSEs that are not individually detectable geodetically. The question remains as to the nature of the strong variability in SSE behavior with depth and duration in the southern Hikauangi margin.
05 Aug 2023Submitted to ESS Open Archive
08 Aug 2023Published in ESS Open Archive