Enhancement of long period components of recorded and synthetic ground motions using InSAR
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Abstract
Tall buildings and flexible structures require a better characterization of long period ground motion spectra than the one provided by current seismic building codes. Motivated by that, a methodology is proposed and tested to improve recorded and synthetic ground motions which are consistent with the observed co-seismic displacement field obtained from interferometric synthetic aperture radar (InSAR) analysis of image data for the Tocopilla 2007 earthquake (Mw=7.7) in Northern Chile. A methodology is proposed to correct the observed motions such that, after double integration, they are coherent with the local value of the residual displacement. Synthetic records are generated by using a stochastic finite-fault model coupled with a long period pulse to capture the long period fling effect.
It is observed that the proposed co-seismic correction yields records with more accurate long-period spectral components as compared with regular correction schemes such as acausal filtering. These signals provide an estimate for the velocity and displacement spectra, which are essential for tall-building design. Furthermore, hints are provided as to the shape of long-period spectra for seismic zones prone to large co-seismic displacements such as the Nazca-South American zone.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Enhancement of long period components of recorded and synthetic ground motions using InSAR |
| Series title | Soil Dynamics and Earthquake Engineering |
| DOI | 10.1016/j.soildyn.2011.01.005 |
| Volume | 31 |
| Issue | 5-6 |
| Year Published | 2011 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Earthquake Science Center |
| Description | 13 p. |
| First page | 817 |
| Last page | 829 |
| Country | Chile |
| Other Geospatial | Tocopilla |
| Google Analytic Metrics | Metrics page |