Slow earthquakes and great earthquakes along the Nankai trough

Details Slow earthquakes and great earthquakes along the Nankai trough Slow earthquakes and great earthquakes along the Nankai trough

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002e%26psl.203..265l&link_type=abstract

Earth and Planetary Science Letters, Volume 203, Issue 1, p. 265-275.

Physics

13

Scientific paper

We have reexamined reports indicating that slow deformation occurred before the great Japan earthquakes of 1944 (Tonankai) and 1946 (Nankaido) and find that the observations are well founded. Although no quantitative models have previously been proposed to explain all of the relevant data we show that they are satisfied by a simple model for both earthquakes. The model, based on known properties of subduction zones, has slow slip on the subduction interface in an area deeper than the seismic rupture. If this model is correct and a similar physical situation holds for an anticipated Tokai earthquake, existing instruments will be able to reveal the pre-slip in real time. While differences among the deformation time series at different sites will provide strong constraints on the slow rupture propagation, these differences could result in delaying the recognition of a coherent event.

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