| 摘 要： | Based on the borehole strainmeter recordings immediately before the strong earthquakes(MS≥7.5) during the period from 2001 to 2005 observed at the Taian observation station,Shandong Province,the authors make a systematic and objective examination of the precursor waves of the quakes.The effects of Earth tides with periods larger than 128 min are eliminated through high-pass filtering;and atmospheric-pressure inferences are removed by linear regression.The 2-128 min signals are then separated into six freque...
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