International Federation of Digital Seismograph Networks

ZP (2021-2022): Physically Understanding Localized Slip Episodisity

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FDSN Network Information

FDSN code ZP (2021-2022) Network name Physically Understanding Localized Slip Episodisity (PULSE)
Start year 2021 Operated by
  • GNS Science
End year 2022 Deployment region -
Description

Subudction zones, where one tectonic palte descends benath another, produce the planet's largest earthquakes and tsunami; but what controls the timing of fault slip in these events? The recent discovery of frequent, semi-predictable slow-motion earthquakes (lasting days to years) on subudction faults, provide an untapped opportunity to investigate what tips the balance on these faults, causing them to fail. Slow-motion earthquakes on the Hikurangi subduction zone offshore New Zealand's east coast are remarkable for the range of slow and fast (seismic) slip processes occurring at shallow depths (<10 km), offering a globally unique opportunity to resolve processes driving slip on subduction zones, using near-field monitoring. Our project is designed to detect localized fault zone changes prior to slow earthquakes, revelaing the physical mechanims that regulate slip timing on a major fault capable of generating devastating earthquakes and tsunami. We use onshore and offshore sensors coupled with novel geophysical methods to detect high-resolution changes in fault properties leading into an upcoming slow-slip event offshore southern Hawkes Bay, and a recent Gisborne event. Resolving these changes will determine whether seismologically-observed changes in fault properties preceded slip, ultimately enabling future development of more accurate forecasts of both slow and possibly fast (seismic slip earthquakes.

Citation Information

Digital Object Identifier (DOI) https://doi.org/10.7914/SN/ZP_2021
Citation
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