 
Summary: Petascale Computing for Future
Breakthroughs in Global Seismology
L. Boschi a
J.P. Ampuero a
D. Peter a
P. M. Mai a
G. Soldati b
D. Giardini a
aInstitute of Geophysics, E.T.H. H¨onggerbergHPP, 8093 Z¨urich, Switzerland
bIstituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata 605, 00143
Roma, Italy
Abstract
Will the advent of "petascale" computers be relevant to research in global seismic
tomography? We illustrate here in detail two possible consequences of the expected
leap in computing capability. First, being able to identify larger sets of differently
regularized/parameterized solutions in shorter times will allow to evaluate their
relative quality by more accurate statistical criteria than in the past. Second, it will
become possible to compile large databases of sensitivity kernels, and update them
efficiently in a nonlinear inversion while iterating towards an optimal solution. We
quantify the expected computational cost of the above endeavors, as a function of
