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Seismic active faults in the northwestern Beijing by seismic tomography
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作者 王培德 李春来 +2 位作者 Wetzig E 黄瑗 赵华 《Acta Seismologica Sinica(English Edition)》 CSCD 2007年第1期11-20,共10页
Using the arrival times of 197 earthquakes well recorded by the Beijing Seismic Network and the China-Germany cooperative Yanqing Digital Seismic Array in the period from October of 2001 to December of 2005, we accura... Using the arrival times of 197 earthquakes well recorded by the Beijing Seismic Network and the China-Germany cooperative Yanqing Digital Seismic Array in the period from October of 2001 to December of 2005, we accurately relocate these earthquakes by the joint-inversion program for hypocentral position and 3-D velocity structure The distribution of hypocenters shows that there are two major seismic active belts in the northwestern Beijing. The first belt stretches from Qinghe, Wenquan to the NW direction and the second extends from Nankou, Changping to the ENE direction. 展开更多
关键词 seismic activity fault northwestern Beijing seismic tomography high accuracy location Yanqing seismic array
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Projection-based High-dimensional Sign Test
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作者 Hui CHEN Chang Liang ZOU Run Ze LI 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2022年第4期683-708,共26页
This article is concerned with the high-dimensional location testing problem.For highdimensional settings,traditional multivariate-sign-based tests perform poorly or become infeasible since their Type I error rates ar... This article is concerned with the high-dimensional location testing problem.For highdimensional settings,traditional multivariate-sign-based tests perform poorly or become infeasible since their Type I error rates are far away from nominal levels.Several modifications have been proposed to address this challenging issue and shown to perform well.However,most of modified sign-based tests abandon all the correlation information,and this results in power loss in certain cases.We propose a projection weighted sign test to utilize the correlation information.Under mild conditions,we derive the optimal direction and weights with which the proposed projection test possesses asymptotically and locally best power under alternatives.Benefiting from using the sample-splitting idea for estimating the optimal direction,the proposed test is able to retain type-I error rates pretty well with asymptotic distributions,while it can be also highly competitive in terms of robustness.Its advantage relative to existing methods is demonstrated in numerical simulations and a real data example. 展开更多
关键词 high dimensional location test problem locally optimal test nonparametric test sample-splitting spatial sign test
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