000019105 001__ 19105
000019105 005__ 20170118182259.0
000019105 04107 $$aeng
000019105 046__ $$k2017-01-09
000019105 100__ $$aNagasaka, Yosuke
000019105 24500 $$aStrong Ground Motion Simulation for the 2005 Central Chiba Intraslab Earthquake With the Pseudo Point-Source Model

000019105 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019105 260__ $$b
000019105 506__ $$arestricted
000019105 520__ $$2eng$$aValidated strong ground motion simulation methods are important for an earthquake-resistant design of structures. However, in the technical standards for ports in Japan, limited methods are available to evaluate shaking from intraslab earthquakes, which occur inside subducting plates. In this study, strong ground motion simulations that use the pseudo point-source model were conducted on the July 23, 2005 Central Chiba intraslab earthquake, which occurred under the Tokyo metropolitan area. The purpose is to develop a suitable strong ground motion estimation method for intraslab earthquakes. Results are analyzed to identify the applicability and understand the limitations of the model. The strong ground motion simulation showed a generally good agreement with observed records. However, underestimation of observed ground motions was found at several stations west of the epicenter. One of the possible causes is the rupture directivity effect, which the current version of the pseudo point-source model does not consider. The rupture process estimated by waveform inversion indicated that the rupture propagated toward the surface. This rupture can cause forward rupture directivity effect at the underestimated stations. We then attempted to introduce a corner frequency model that expressed the rupture directivity effect of unilateral rupture. The modelled corner frequencies do not match the observed corner frequencies. Although considering the directivity effect was unnecessary for the 2005 Central Chiba intraslab earthquake, we continued to investigate the applicability of the model. Variation in the site amplification factors is discussed as another potential cause of the underestimation. At the underestimated stations, the site amplification factors of the intraslab earthquakes that occurred near the 2005 Central Chiba earthquake were found to be larger than those of the earthquakes that occurred at various locations. The results of the simulation were improved with the use of corrected site amplification factors for intraslab earthquakes.

000019105 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019105 653__ $$astrong ground motion simulation, pseudo point-source model, intraslab earthquake

000019105 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019105 720__ $$aNagasaka, Yosuke$$iNozu, Atsushi
000019105 8560_ $$ffischerc@itam.cas.cz
000019105 8564_ $$s808767$$uhttps://invenio.itam.cas.cz/record/19105/files/2855.pdf$$yOriginal version of the author's contribution as presented on USB, paper 2855.
000019105 962__ $$r16048
000019105 980__ $$aPAPER