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.

Walsh, B., Jolly, A. D., & Procter, J. (2017). Calibrating the amplitude source location (ASL) method by using active seismic sources: An example from Te Maari volcano, Tongariro National Park, New Zealand. Geophysical Research Letters, 44(8), 3591–3599. Portico. https://doi.org/10.1002/2017gl073000