التفاصيل البيبلوغرافية
| العنوان: |
Ground-Motion Simulation and Validation of the 2008 Chino Hills, California, Earthquake. |
| المؤلفون: |
Taborda, Ricardo, Bielak, Jacobo |
| المصدر: |
Bulletin of the Seismological Society of America; Feb2013, Vol. 103 Issue 1, p131-156, 26p |
| مصطلحات موضوعية: |
EARTHQUAKES, SEISMOLOGY, PREDICTION models, SIMULATION methods & models, EARTHQUAKE magnitude, ELASTIC wave propagation, FINITE element method |
| مصطلحات جغرافية: |
CHINO Hills (Calif.), CALIFORNIA |
| مستخلص: |
We present a simulation of the 2008 Mw 5.4 Chino Hills earthquake for a maximum frequency up to 4 Hz and a minimum shear-wave velocity down to 200 m/s and perform a validation study comparing data obtained from seismic networks with simulation synthetics on more than 300 recording stations. The simulation was done using a parallel-computing code for earthquake simulations that implements a finite-element solution to anelastic wave propagation in heterogeneous media. The source model corresponds to that of an independent inversion study, and the material model used is a community velocity model (CVM) developed by the Southern California Earthquake Center (SCEC). Our results for the goodness-of-fit measure of the syn-thetics indicate that, from a regional perspective, the simulation starts to deviate from the data at frequencies above 1 and 2 Hz. At particular locations or station clusters, however, the synthetics yield very good results, even at frequencies between 2 and 4 Hz. The best results are obtained between 0.1 and 0.25 Hz over the entire region and up to 1 Hz within the major basins. These and other results from comparisons at boreholes, biases of the peak surface response, and the differences in the strong-phase duration of the waveforms and the arrival time of P waves suggest a strong sensitivity to seismic velocities. In particular, the CVM used seems to misrepresent the shallow soil deposits and overestimate seismic velocities in the upper layers out-side the basins. These observations are helpful in identifying regions where the veloc-ity model may need to be revised. Overall, this study shows that extending the maximum frequency for deterministic earthquake simulations beyond 1 Hz is an effort worth pursuing. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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