Coherence of SH-waves near a semi-circular inclusion-the role of interference and standing waves

作     者：Z.Tokmechi R.S.Jalali M.D.Trifunac M.I.Todorovska Z.Tokmechi;R.S.Jalali;M.D.Trifunac;M.I.Todorovska

作者机构：Department of Civil EngineeringFaculty of EngineeringUniversity of GuilanP.O.Box 3756RashtIran Department of Civil EngineeringUniversity of Southern CaliforniaLos AngelesCalifornia 90089USA Department of Civil EngineeringTianjin UniversityTianjin 300350China 

出 版 物：《Earthquake Engineering and Engineering Vibration》 (地震工程与工程振动（英文刊）)

年 卷 期：2021年第20卷第3期

页      面：535-552页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

主　　题：coherence of strong motion coherence in the presence of standing waves coherence caused by interference reduction of coherence for radiation from large faults 

摘      要：We present examples of a controlled numerical experiment that contribute towards understanding of the physical phenomena that lead to the reduction of coherency of strong earthquake ground *** show examples for separation distance of 100 m between the two points on the ground surface,which is in the range of engineering *** examples illustrate the consequences of:(a)standing waves that result from interference of the incident and reflected waves from a near vertical contrast in material properties,(b)standing waves within a concave inhomogeneity(a semi-circular valley in our examples),and(c)smaller motions in the diffraction zone,behind the *** show that it is possible to reduce coherency,to the extent observed for recorded strong earthquake ground motion,even by a single inclusion in a half space,for incident ground motion that is *** also illustrate the combined effects of geometric spreading and finite fault width,superimposed on the otherwise dominating effects caused by *** examples show reduction of coherence for specific angles of incident waves,while,for other angles of incidence,the coherence remains essentially equal to one.