000018512 001__ 18512
000018512 005__ 20170118182225.0
000018512 04107 $$aeng
000018512 046__ $$k2017-01-09
000018512 100__ $$aYanxiang, Yu
000018512 24500 $$aResearch on Shakemap of Peak Ground Acceleration With Bias Correction for Ludian Ms6.5 Earthquake on 3 Aug 2014

000018512 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018512 260__ $$b
000018512 506__ $$arestricted
000018512 520__ $$2eng$$aOn 3 August 2014 a great earthquake of Ms6.5 struck Yunan province. The epicenter (27.1°N, 103.3°E) of the earthquake was located in Ludian county Zhaotong City, with a focal depth of 12km according to China Earthquake Administration. This catastrophic event caused extensive casualties and heavy engineering damage in a wide area. The earthquake caused 615 deaths, 114 missing and 3,000 people injured and a large number of houses collapsed and damaged. Considering the geological context, focal mechanism solutions, aftershock distribution, strong-motion peak accelerations and attenuation characteristics of the ground motion in western China, shakemap of PGA (Peak Ground Acceleration) for the Ludian was investigated. In order to reduce the uncertainty of the small value peak acceleration, this paper selected 22 strong-motion peak acceleration with PGA greater than 10gal, using Bias correction method to Correct ShakeMaps of the peak acceleration before. Considering the effect of local site effects, the PGAs of observation stations on surface were converted to the reference surface bedrock. Then abnormal data, outside three times the standard deviation of peak acceleration attenuation relationship, was excluded. Deviation factor (c0 = -2.89; c1 = 1.58) between observed value and estimated value of PGA attenuation relationship can be derived from the log-linear fitting peak acceleration. The estimates of PGA in area without stations were adjusted with the above deviation factor (c0, c1). Finally, considering the effects of local site, the estimates of PGA on bedrock were corrected to the value of the surface, interpolating with real observations to acquire the contour maps of peak ground acceleration. Relationship between PGA and intensity was consistent with the Chinese seismic intensity scale (GB17742-2008) The results shown that decay rate of the peak ground acceleration versus distance for this earthquake was faster than the peak acceleration attenuation relationship of Western China (derived from the 258 earthquake). Results of logarithmic bias correction were more consistent with attenuation of this earthquake. An area with PGA greater than 40gal after correcting is nearly 8,000 square kilometers, which is reduced by about 40%.

000018512 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018512 653__ $$aDistribution of Peak Ground Acceleration， LuDian earthquake， Bias correction;

000018512 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018512 720__ $$aYanxiang, Yu$$iKun, Chen
000018512 8560_ $$ffischerc@itam.cas.cz
000018512 8564_ $$s813095$$uhttps://invenio.itam.cas.cz/record/18512/files/1619.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1619.
000018512 962__ $$r16048
000018512 980__ $$aPAPER