Journal
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Volume 20, Issue 8, Pages 4292-4304Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GC008229
Keywords
Slow slip; Hikurangi; Absolute pressure gauge; Ocean bottom pressure gauge; Gisborne; New Zealand
Categories
Funding
- U.S. NSF EAPSI [1713928, OCE-1551929, OCE1334654, OCE-1551876]
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Studying offshore slow-slip events (SSEs) along subduction zone interfaces is important for constraining the overall slip budget and potential for seismic slip and the relationship with large megathrust earthquakes. Models using only onshore data increasingly lack model resolution the further from the shore the SSE occurs. In this study, we combine data from the Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip seafloor absolute pressure gauge (APG) network with daily position time series from New Zealand's GeoNet to create time-dependent models of slip during the 2014 Gisborne, New Zealand SSE using the Network Inversion Filter. We compare models assuming heterogeneous versus homogenous elastic properties to explore their influence on our models. The time-dependent results show that slip uncertainties under the APGs drop by about 23%. We also find that the peak value of slip increases with heterogeneous elastic properties as compared to homogenous models. The inclusion of the offshore APG data in our models places more slip near the trench and detects a more defined migration of slip, especially in the heterogeneous model. These differences are important for interpreting the relationship between the SSE and associated tremor, which occurs after the peak SSE slip rate. Additionally, we use a static potency bounding technique in order to gauge the range of models that can fit the data. This analysis demonstrates that the inclusion of offshore data helps to substantially narrow the range of plausible slip models.
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