微动勘探法圆形阵列台站数量和分布方式研究

对于微动勘探法常用的圆形阵列,讨论圆周上不同台站数量和分布方式对实测结果的影响。以10个台站的圆形阵列为例,对场地实测微动数据估算其空间自相关系数;并对比分析不同台站数量和分布方式情况下空间自相关系数的差别。结果表明:当圆周上只有1个台站时,难以得到准确的空间自相关系数;当等间隔分布3个台站时,能得到准确的空间自相关系数;当不等间隔分布3个台站时得到的空间自相关系数会有一定的扰动,且在第一个最小值附近有很大的偏差。结论是圆周上等间隔分布3个台站的圆形阵列最具适用性。

Study on station number and arrangement of circle arrayin Mircrotremor Survey Method

As the circular array frequently used in Mircrotremor Survey Method, this paper discusses the influence to measured results caused by different station number and arrangement on the circumference. With 10 stations arranged in circle for example, we estimate the SPAC coefficient from microtremor record, and compare the deviation of SPAC coefficient caused by different station number and arrangement on the circumference . The result is that when only one station on the circumference, SPAC coefficient can not be obtained accurately; when 3 stations are equally spaced, SPAC coefficient can be obtained accurately; when 3 stations are unequally spaced, SPAC coefficient can not be obtained accurately. The conclusion of paper is that 3 stations equally spaced on the circumference is the most suitable.