大地测量与地球动力学2011，Vol.31Issue(4)：6-9,4.
S变换在汶川地震前后应变变化分析中的应用
APPLICATION OF S TRANSFORM IN ANALYSIS OF STRAIN CHANGES BEFORE AND AFTER WENCHUAN EARTHQUAKE
摘要
Abstract
It is found that some abnormal signals like compressive pulses and tidal distortion of the 4-compo-nent borehole strain observation at Guza station about a year before the Wenchuan Ms8.0 earthquake in 2008 and e-ven continued to occur occasionally after the earthquake. The S transform was tried to apple to the field in order to carry out a further research into the abnormal signal characteristic from a different perspective. An analysis of 4-component borehole strain observation from over 20 stations within 1500 kms from the Wenchuan epicenter showed that only in the observations at Cuza station there were significant abnormal signals with the following characteristics; On the basis of the background signals, the signals with period of about 10 to 60 minutes increased before the Wenchuan earthquake and gradually decreased after the earthquake, meanwhile, the most powerful signals were background signals with the power enhanced before the earthquake and weakened after it.关键词
汶川地震/四分量钻孔应变/时频分析/地震前兆/S变换Key words
Wenchuan earthquake/ 4-component borehole strain/ time-frequency analysis/ earthquake precursor/ S transform分类
天文与地球科学引用本文复制引用
刘琦,张晶..S变换在汶川地震前后应变变化分析中的应用[J].大地测量与地球动力学,2011,31(4):6-9,4.基金项目
中国地震局地震行业专项(2011080093) （2011080093）
中国地震局地震预测研究所基本科研专项(02092432) （02092432）
