Transverse Isotropy and the Evolution of the Upper Oceanic Crust

横向各向同性和上洋壳的演化

• 批准号: 8711646
• 负责人: Gerard Fryer
• 金额: $ 12.5万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-10-15 至 1990-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8711646&HistoricalAwards=false
• 关键词: Transverse; Isotropy; Evolution; Upper; Oceanic

The concept of apparent thinning of the layer 2A with age due to seismic anisotropy is the central theme of this research. According to the P.I., the horizontal velocity in the upper crust is a much as 40% higher than the velocity measured in the vertical direction. This is due to subhorizontal cracks in the uppermost oceanic crust which are most prominent near the spreading center. With age these cracks are filled by alteration products and this reduces the extent of the anisotropy. In other words, the apparent thinning of layer 2A as observed in seismic reflection and refraction studies is caused by increase in seismic velocities (measured vertically) away from the spreading axis. In this award, the P.I. will test this concept by computer modeling of the existing data and in the process will understand the mechanism of hydrothermal mineralization in the crust. Any such modeling work should be completed before carrying out a field study. The P.I. is a capable theoritical geophysicist and modeler and the study has a very high chance of success.

2A层随年龄明显变薄的概念 由于地震各向异性是本研究的中心主题。 据私家侦探说，上地壳水平速度 是一个高达40%以上的速度测量在 垂直方向。 这是由于地下室的 最上面的洋壳在靠近大洋的地方最为突出 扩散中心 随着年龄的增长，这些裂缝被蚀变所填补 这降低了各向异性的程度。 换句 换句话说，在地震中观察到的2A层明显变薄， 反射和折射研究是由增加， 地震速度（垂直测量）远离扩展 轴线 在这个奖项中，P.I.我将用电脑来测试这个概念 现有数据的建模，并在此过程中将了解 地壳热液成矿机制。 任何此类建模工作都应在进行 实地研究 私家侦探是一个有能力的理论唯物主义者， 这是一个很好的模型，这项研究有很大的成功机会。