Applicability of the Welch method for examining self-noise level parameters for broadband seismometers  

作　　者：Li Xiaojun Yang Dake Xie Jianbo Ma Jiemei Yuan Songyong Xu Weiwei Zhao Jianhe Li Dongsheng 

机构地区：[1]Earthquake Administration of Hebei Province [2]Institute of Geophysics, China Earthquake Administration [3]Earthquake Administration of Guangdong Province [4]Earthquake Administration of Anhui Province

出　　处：《Geodesy and Geodynamics》2015年第3期233-239,共7页大地测量与地球动力学（英文版）

基　　金：supported by Study on Seismograph Calibration and Preparation of Draft International Standard (201408005);the Earthquake Science and technology Program of Hebei Province (201303);Special Program for Earthquake monitoring (20130203)

摘　　要：Seismometer self-noise levels were determined using Sleeman’s three-sensor method in combination with the Welch method for different parameter combinations. The self-noise levels decreased with the increasing segment window length, which is equivalent to the subwindow length, and with the increasing segment overlap rate for different frequency points at a fixed band. After the statistical examination of 9800 different parameter combinations, a zone of reasonable self-noise calculation parameter combinations was identified. Reasons for the unsuitability of certain parameter combinations were explored with respect to their distortion of the seismometer’s self-noise levels.Seismometer self-noise levels were determined using Sleeman’s three-sensor method in combination with the Welch method for different parameter combinations. The self-noise levels decreased with the increasing segment window length, which is equivalent to the subwindow length, and with the increasing segment overlap rate for different frequency points at a fixed band. After the statistical examination of 9800 different parameter combinations, a zone of reasonable self-noise calculation parameter combinations was identified. Reasons for the unsuitability of certain parameter combinations were explored with respect to their distortion of the seismometer’s self-noise levels.

关 键 词：Self-noise Seismometer Welch method Applicability 

分 类 号：P315.62[天文地球—地震学]