000018200 001__ 18200
000018200 005__ 20170118182212.0
000018200 04107 $$aeng
000018200 046__ $$k2017-01-09
000018200 100__ $$aDalguer, Luis
000018200 24500 $$aPermanent Displacement From Surface-Rupturing Earthquakes: Insights From Dynamic Rupture of Mw7.6 1999 Chi-Chi Earthquake

000018200 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018200 260__ $$b
000018200 506__ $$arestricted
000018200 520__ $$2eng$$aLarge permanent displacements, sometimes named “fling”, resulted from surface-rupturing faulting have been observed in some earthquakes, such as the 1999 Kocaeli, 1999 Chi-Chi, 2002 Denali, reaching amplitudes over 8 m. This type of nearsource ground motion is different from ordinary ground motion often evaluated by engineers and seismologist, for example to derive traditional ground motion prediction equations or to conduct seismic hazard studies. These permanent displacements are formed from coherent long period velocity pulses caused mainly by the offset of the ground surface when fault-rupture extends to the earth surface. To further investigate this type of ground motion, we developed dynamic rupture simulations of the Mw7.6 1999 Chi-Chi, Taiwan earthquake using asperity models in which the shallow layer (SL) of the first 2km depth is assumed to operate during rupture with enhanced energy absorption mechanism, as such it is parameterized with negative stress drop. Our physics-based dynamic rupture models show that the velocity ground motion causing permanent displacement near the source is dominated by the energy carried by the slip velocity pulse at the shallow layer fault of the first 2km depth, though this shallow zone is characterized with negative or zero stress drop. The asperities are the main driver elements to break the shallow layer and free-surface, but if surface rupture is not allowed, the rupture is inhibited to extend along strike, consequently the velocity pulse causing permanent displacement is reduced significantly. This study suggests that the slip velocities at the shallow fault zone, in which zero or negative stress drop operates, are the main source causing strong velocity pulses causing permanent displacement near the source. Therefore, when using simplified models, such as kinematic models, to study near source ground motion of surface-rupturing earthquakes, these slip velocity functions at the shallow zone have to be carefully considered.

000018200 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018200 653__ $$aPermanent displacement, surface rupture, dynamic rupture simulation, slip velocity function, near-source ground motion.

000018200 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018200 720__ $$aDalguer, Luis$$iIrikura, Kojiro$$iWu, Hao
000018200 8560_ $$ffischerc@itam.cas.cz
000018200 8564_ $$s1247400$$uhttps://invenio.itam.cas.cz/record/18200/files/1004.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1004.
000018200 962__ $$r16048
000018200 980__ $$aPAPER