【摘要】 引入时频分析中的S变换方法,对姑咱台四分量钻孔应变观测曲线中出现的"压性脉冲"和"潮汐畸变"异常信号进行分析。结果表明,在背景信号的基础上,周期约10～60分钟的信号在汶川地震前开始大量出现,震后逐渐衰减;能量最大的信号仍然是背景信号,其能量幅度随地震发生时间的临近而增大,震后逐渐减弱。更多还原

【Abstract】 It is found that some abnormal signals like compressive pulses and tidal distortion of the 4-component borehole strain observation at Guza station about a year before the Wenchuan Ms8.0 earthquake in 2008 and even 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 Guza 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.更多还原