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OALib Journal期刊
ISSN: 2333-9721
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初至波层析成像的反演参数选取:以南海中央次海盆三维地震探测数据为例*
Keywords: 初至波层析成像,反演参数,三维地震探测,中央次海盆
Abstract:
？fast(firstarrivalseismictomography)软件是获取复杂地区三维深部结构的最常用工具之一,而反演参数选取是快速有效地获得真实合理的地震结构的关键环节。以南海中央次海盆三维地震探测数据为基础,采用先固定其中一个参数、选取另外一个参数、再综合选取的控制变量法,详细地介绍了fast反演参数组合的选取过程。选取结果表明,反演参数组合(阻尼因子λ=2,平滑度权重因子sz=1,反演次数i=4)为南海中央次海盆三维地震结构的最佳反演参数,由此获得的最佳初步速度模型表明中央次海盆具有典型慢速扩张的洋壳结构。此项反演参数选取工作不仅为珍贝-黄岩海山链精细三维地震结构的正式模拟奠定了基础,同时为fast软件在其他地区的应用提供了丰富的经验与借鉴。
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