地震台阵滤波及子台分布对聚束效果的影响(Ⅱ)——子台分布及聚束效果的分析

INFLUENCE OF THE WAVE FILTER AND THE DISTANCE AMONG SUBSTATIONS TO BEAM-FORM IN SEISMIC ARRAY (Ⅱ)——ANALYSIS ON BEAM-FORM EFFECT AND CONFIGURATION OF ARRAY

摘要:

本文假设对于确定的相关系数及子台间距存在一个相干波长,将不同频率、震中距的相关性变化的原因归纳为视波长的变化.对近事件而言,几乎不存在相关系数十分理想的子台间距的区间范围.对非理想相关的台阵,应用S. Mykkeltveit等介绍的增益公式来预测台阵的增益,其效果与实际情况吻合的较好.论述了区域台阵与侦察远处事件的台阵有诸多不同之处.

Abstract:

On the hypothesis that for a given correlation coefficient and a distance between two substations, there will be a referent correlative wavelength, and all the changes of correlation caused by frequency and epicentral distance can be regarded as changes of the apparent wavelength. For near events, there are no ideal correlation coverage of the distances among substations.In the case.using the gain formula reported by S. Mykkeltveit etc.to forecast signal-noise ratio gain of beam-form is proposed, without restriction on array configuration.The method appears to fit for our data.Some differences between a regional array and for far enent one are discussed.