Publications
The basement morphology under Tongariro National Park, southern Taupo Volcanic Zone
A deep, asymmetric trough underlies Tongariro National Park, extending from the southern end of Lake Taupo and reaching beneath Mt. Tongariro before diminishing near Mt. Ruapehu. This geological feature, up to 2.5 km deep, was revealed through analysis of gravity data collected in the 1950s and 1960s, processed into Bouguer anomalies at an elevation of 500 meters. Researchers separated regional and residual anomalies, derived sediment density-depth relationships from borehole measurements, and used 2D gravity modeling to construct a 3D structural model. The study provides critical insights into the subsurface morphology of the southern Taupo Volcanic Zone, contributing to our understanding of volcanic activity in this UNESCO World Heritage Site.
Calibrating the amplitude source location (ASL) method by using active seismic sources: An example from Te Maari volcano, Tongariro National Park, New Zealand
A study on Te Maari volcano, Tongariro National Park, reveals that the amplitude source location (ASL) method can produce significant location discrepancies—up to 1.0 km laterally and 500 m in depth—when using independently determined velocity models, attenuation factors, and site amplification factors (AFs). Sensitivity tests show that while attenuation and velocity have a moderate influence on ASL accuracy, AFs strongly impact location precision, potentially introducing substantial uncertainties. The research demonstrates that model uncertainties can affect either lateral or depth estimates depending on input parameters, station corrections, and source-station geometry, providing critical insights for refining seismic monitoring techniques in volcanic regions.
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