000010336 001__ 10336
000010336 005__ 20141205155716.0
000010336 04107 $$aeng
000010336 046__ $$k2008-10-12
000010336 100__ $$aIrie, Kiyoshi
000010336 24500 $$aSeismic Fault Model for Predicting Strong Ground Motions Based on Physical Relation Between Surface and Subsurface Slip

000010336 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000010336 260__ $$b
000010336 506__ $$arestricted
000010336 520__ $$2eng$$aThe strong ground motions and the displacement of the surface fault trace are the results of the rupture of the subsurface fault, but they are not related physically with each other so far. Therefore, we proposed a procedure to model a subsurface fault for predicting strong ground motions under the physical constraint of the displacement of the surface fault trace estimated by the empirical relationship between the fault length and the displacement. In the procedure, given the fault length and the width, eight fault parameters of the fault area, the seismic moment, the short-period level, the average stress drop on the entire fault, the average slip on the entire fault, the area of the asperities, the stress drop on the asperities, and the S-wave velocity of the shallow layers were evaluated based on the eight theoretical and empirical equations of these fault parameters. Here, the short-period level is the flat level of the acceleration source spectrum in the short-period range. Since two unknown constants were included in the equations, they were determined by the results of a preliminary dynamic rupture simulation. We carried out the dynamic rupture simulation by the 3D finite difference method. We took an example of the fault model 25-km long and 15-km wide, consisting of two asperities. And, we obtained the areas of the asperities of 3.2 km×3.2 km and 1.9 km×1.9 km, the dynamic stress drop of the asperities of 32 MPa, and the S-wave velocity of the shallowest layer of 0.5 km/s. On the other hand, the rupture propagation velocity of the results was faster than the S-wave velocity, called super-shear, on some area of the fault. Since the super-shear rupture propagation velocity is not realistic in the earthquake of the fault size studied in this paper, we should further examine the parameters of the slip weakening model, for example, giving some random fracture energy on the fault.

000010336 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000010336 653__ $$asubsurface fault, strong motion prediction, asperity model, dynamic rupture simulation, slip-weakening model, surface fault

000010336 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000010336 720__ $$aIrie, Kiyoshi$$iDan, Kazuo$$iMatsumoto, Ryoichiro$$iMiake, Masayuki$$iIrikura, Kojiro
000010336 8560_ $$ffischerc@itam.cas.cz
000010336 8564_ $$s462264$$uhttps://invenio.itam.cas.cz/record/10336/files/03-01-0008.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 03-01-0008.
000010336 962__ $$r9324
000010336 980__ $$aPAPER