Deep Earthquakes From the Pre-Digital ERA

前数字时代的深层地震

• 批准号: 9316396
• 负责人: Emile Okal
• 金额: $ 20.01万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-04-01 至 1998-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9316396&HistoricalAwards=false
• 关键词: Deep; Earthquakes; Pre; Digital; ERA

WPC 2 ' B Z R # X #| x HP LaserJet IIIP HPLSIIIP.PRS x @ , \ , | @Courier 10cpi Courier 10cpi (Bold) ? x x x , x 6 X @ 8 ; X @ ? x x x , d x ` B ; X | H H 8 2 Y 9218907 X ` h p x (# % '0* , .81 3 5@8 : H? A H 8 Okal H 8 H H @H H ' This research is to study the seismic structure of the Ontong Java Plateau, the largest expression of igneous activity of the ocean floor. Four seismic stations composed of PASSCAL instruments will be deployed for two years on the Micronesian islands of Chuuk, Pohnpei, Kosrae and Nauru. Earthquake sources in the Solomon subduction zone will be used to investigate the dispersion of surface waves over the plateau to measure seismic structure to depths on the order of 200 km. Concurrently, a number of body wave experiments will be conducted targeting the structural anisotropy of the crust and upper mantle in the area. The work is expected to provide answers to such questions as the exact thickness of the crust, the nature of the deep crust, the structure of the mantle (lid and underlying low velocity zone) of the plateau, and the extent and direction of anisotropy in the upper mantle. In turn, these parameters will put constraints on the environment and mechani sm of emplacement of the plateau in the Cretaceous. ***

WPC 2英尺 B Z R # X #|X HP LaserJet IIIP HPLSIIIP.PRS X @ , \ , | @C10cpi C10 cpi（粗体） ? x x x， X 6 X @ 8 ; X @ ? x x x， D X ` B ; X | H H 8 2 Y 9218907 X ` H p X （# % '0*，.81 3 5@8：H？一 H 8 欧卡尔 H 8 H H @H H ' 这项研究是为了研究翁东爪哇高原的地震结构，这是海底火山活动的最大表现。 由PASSCAL仪器组成的四个地震观测站将在巴布亚新几内亚的楚克、波恩佩、科斯雷和瑙鲁岛部署两年。 将利用所罗门俯冲带的地震震源来调查高原上表面波的分散情况，以测量200公里左右深度的地震结构。 与此同时，将针对该地区地壳和上地幔的结构各向异性进行一些体波实验。 预计这项工作将回答诸如地壳的确切厚度、深部地壳的性质、高原的地幔结构（盖层和下面的低速带）以及上地幔各向异性的程度和方向等问题。 这些参数反过来又制约着白垩纪高原的侵位环境和机制。***