[图书馆]EARTHQUAKE DYNAMICS AND THE PREDICTION OF STRONG GROUND [复制链接]

A large number of earthquakes have been modelled in detail using seismological, geological and amSyGQ2  
geodetic information. Several common traits have been found for earthquakes kinematics at O.E0LCABC  
periods longer than 3s. At these frequencies, all large earthquakes (M>7) appear complex with kC k-  
highly variable slip, and propagate with rupture velocities close to about 80 % of the shear wave :3t])mL#   
speed. Starting from these kinematic inversions, it is possible to use numerical wave propagation ^0&] .m  
models in order to estimate the complete radiated field including near and far field effects. *]eZ Y  
Radiation can be separated into two main components: a near field term responsible for the socalled C
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fling steps due to permanent, geodetic offsets; and the far field that produces pulse like q kKABow  
motions. Using seismological scaling relations it is possible to explain the main features of h|H;ZC(B  
displacement spectra using classical seismological models at long periods. Seismic simulations \l2 s^7G_  
may now be extended to the frequencies up to a few Hz by means of dynamic rupture propagation, GMNb;D(>K  
where rupture is simulated starting from the kinematic models. In this talk I will review the main ye%F <:O7  
results obtained so far and the new avenues of research that have been opened thanks to new near {DK:"ep  
field earthquake data and the ability to simulate increasingly complex and realistic seismic e
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ruptures in a computer.