Effects of tsunami at sissano lagoon, Papua new guinea: submarine-landslide and tectonics origins

摘要

A submarine landslide has been conjectured at the outset as a source of the 1998 PNG tsunami, because the observed run-up pattern was much more localized than the predictions of numerical simulations with a co-seismic fault source. The discrepancy is however resulted from the faulty bathymetry data and insufficient grid size in the simulations. An earthquake fault source combined with the seafloor geometry taken from the published nautical chart can explain the tsunami focusing. A smaller source area of the submarine landslide results a runup distribution pattern distinct from the fault-source model.