Premium
Orientation error estimation of buried seismographs in array observation
Author(s) -
Yamazaki Fumio,
Lu Lin,
Katayama Tsuneo
Publication year - 1992
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290210803
Subject(s) - seismometer , orientation (vector space) , coherence (philosophical gambling strategy) , ground motion , geodesy , random error , point (geometry) , geology , algorithm , geometry , mathematics , statistics , seismology
Abstract Array observation is an efficient tool to investigate various characteristics of earthquake ground motion. However, seismographs used in arrays may involve unexpected errors in their orientations. Methods of orientation error estimation were developed in three‐dimensional space by comparing recorded ground motions at a reference point with those at a checking point. A maximum cross‐correlation method and a maximum coherence method were proposed and their accuracy was demonstrated. The earthquake ground motions recorded in the Chiba array and in two other arrays were used in numerical examples. Non‐trivial orientation errors were detected for all these arrays. The cross‐correlation coefficients and the coherence values between two points increased significantly by correcting the estimated orientation errors.