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> REPLACE THIS LINE WITH YOUR PAPER IDENTIFICATION NUMBER (DOUBLE-CLICK HERE TO EDIT) < 1 Abstract--We discuss the possibility of imaging the propagation of seismic waves from a very large space-based optical
 

Summary: > REPLACE THIS LINE WITH YOUR PAPER IDENTIFICATION NUMBER (DOUBLE-CLICK HERE TO EDIT) < 1

Abstract--We discuss the possibility of imaging the propagation of seismic waves from a very large space-based optical
telescope. Images of seismic waves propagating at the Earth's surface would be an invaluable source of information for
investigating earthquake physics and the effect of the subsurface on earthquake ground motions. This application would
require ground displacement measurements at about every 100 m, with centimetric accuracy, and temporal sampling on
the order of 1 Hz. A large field of view (>105
km2
) is required to measure the full extent of a large earthquake in the areas
of interest. A geostationary optical telescope with a large aperture appears to be the most promising system. We establish
preliminary technical requirements for such a system, which lead us to consider a telescope with an angular field of view
of 0.8 degree and with an aperture greater than 4 m. We discuss and quantify the various sources of noise that would
limit such a system: atmospheric turbulence; evolution of ground reflectance and solar incidence angle; and stability of
the platform at 1 Hz. We present numerical simulations, which account for these sources of noise. They show that key
details of the seismic wave field, hardly detectable using ground-based instruments, would indeed be imaged by such a
system. Data flow would be about 20-50 Gb.s-1
and data memory about 50 Tb, at the upper limit of modern technology.
Index Terms--Geophysical deformations, large space telescope, geostationary, earthquakes, subpixel, correlation, optical flow,
photoclinometry, Earth monitoring
I. INTRODUCTION

  

Source: Ampuero, Jean Paul - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collections: Geosciences