Inversion history of the northern Tasman Ridge, Taranaki Basin, New Zealand: implications for petroleum migration and accumulation

Seebeck, Hannu; Thrasher, Glenn P.; Viskovic, Paul

doi:10.1080/00288306.2019.1695633

Cited by 8 publications

(13 citation statements)

References 39 publications

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“…The 3D structure of the CEF is resolved to a depth of ∼8 km using high‐quality industry 2D and 3D seismic‐reflection lines covering a region 80 km long and up to 35 km‐wide (Figure 1; Seebeck et al., 2020, 2021). The CEF is a Late Cretaceous‐Palaeocene normal fault that was inverted (i.e., reverse reactivated) during the Miocene and has subsequently accommodated a further phase of Plio‐Pleistocene to Recent normal faulting (Nicol et al., 2005; Reilly et al., 2015; Seebeck et al., 2020), which is the subject of this paper. The geometry of the CEF fault surface changes along strike and down dip, therefore providing the opportunity to test how introducing a realistic fault geometry influences simulated earthquake catalogs (compared with, e.g., a simple planar approximation to fault geometry).…”

Section: Methodsmentioning

confidence: 99%

“…The CEF is well imaged by geophysical data and has been extensively studied (King & Thrasher, 1996; Nicol et al., 2005; Nodder, 1993, 1994; Seebeck et al., 2020, 2021). The 3D structure of the CEF is resolved to a depth of ∼8 km using high‐quality industry 2D and 3D seismic‐reflection lines covering a region 80 km long and up to 35 km‐wide (Figure 1; Seebeck et al., 2020, 2021). The CEF is a Late Cretaceous‐Palaeocene normal fault that was inverted (i.e., reverse reactivated) during the Miocene and has subsequently accommodated a further phase of Plio‐Pleistocene to Recent normal faulting (Nicol et al., 2005; Reilly et al., 2015; Seebeck et al., 2020), which is the subject of this paper.…”

Section: Methodsmentioning

confidence: 99%

“…was inverted (i.e., reverse reactivated) during the Miocene and has subsequently accommodated a further phase of Plio-Pleistocene to Recent normal faulting (Nicol et al, 2005;Reilly et al, 2015;Seebeck et al, 2020), which is the subject of this paper. The geometry of the CEF fault surface changes along strike and down dip, therefore providing the opportunity to test how introducing a realistic fault geometry influences simulated earthquake catalogs (compared with, e.g., a simple planar approximation to fault geometry).…”

Section: The Cape Egmont Faultmentioning

confidence: 99%

“…Inset map is a depth structure map of Base Pliocene unconformity (after Seebeck et al, 2021). (b and c) Interpreted seismic sections of the CEF and some horizons (after Seebeck et al, 2020). See (a) for location of sections.…”

Section: The Cape Egmont Faultmentioning

confidence: 99%

“…Prominent changes in fault strike occur at a high-angle junction between the northern (characterized by multiple synthetic and antithetic faults) and the southern segments along fault branch lines (Nicol et al, 2005;Seebeck et al, 2021). These changes in fault geometry at least partly reflect differences in the reactivation and inversion history of the fault since the Late Cretaceous (Nicol et al, 2005;Seebeck et al, 2020). The most recent phase of normal faulting on the CEF commenced at ca.…”

Section: The Cape Egmont Faultmentioning

confidence: 99%

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Impact of Variable Fault Geometries and Slip Rates on Earthquake Catalogs From Physics‐Based Simulations of a Normal Fault

Delogkos,

Howell,

Seebeck

et al. 2023

JGR Solid Earth

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Physics‐based earthquake simulators have been developed to overcome the relatively short duration and incompleteness of historical earthquake and paleoseismic records, respectively. These simulators have the potential to be a useful addition to seismic hazard assessment as they produce millions of synthetic earthquakes over thousands to millions of years using predefined fault geometries and slip rates. Due to the sparsity of fault data and the computational expense of the modeling, it is common to simplify earthquake simulator input parameters. Fault surfaces are typically characterized by simplified mapped traces and constant dip with depth, with slip rates that are often assumed to be uniform over the fault plane. This study uses the well‐defined 3D geometry of an active normal fault in offshore Aotearoa New Zealand, the Cape Egmont Fault, to demonstrate the impact of using nonuniform slip rates and nonplanar fault geometries on the resulting synthetic earthquakes from the earthquake simulator RSQSim. Adopting variable slip rates that decrease to zero along the fault tipline (rather than uniform slip rates) reduces unrealistically high nucleation rates of seismicity along fault edges. Introduction of complex 3D fault geometries, including fault segmentation and bends on kilometer scales, and variable slip rates produces less characteristic earthquake populations, increasing the number of M6‐7 moderate‐large magnitude events. Incorporation of variable fault geometries and slip rates in physics‐based simulators may modify the seismic hazards estimated from synthetic earthquake catalogs.

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