Collaborative Research: Lithospheric Evolution in Response to Triple Junction Migration: Seismic Images of the Mendocino Triple Junction Region

合作研究：响应三重交界迁移的岩石圈演化：门多西诺三重交界地区的地震图像

• 批准号: 9526116
• 负责人: Anne Meltzer
• 金额: $ 5万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-15 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526116&HistoricalAwards=false
• 关键词: Collaborative; Research; Lithospheric; Evolution; Response

9526116 Meltzer The coastal region of northern California from latitude 39oN to42oN represents a region in which the active tectonic regime changes abruptly from subduction to transform motion at the Mendocino Triple Junction (MTJ). Knowledge of the crustal and upper-mantle structure in this region, when combined with information on the plate-tectonic history, geologic structure, seismic activity, and timing and extent of heat influx and consequent surface volcanism, places constraints on the processes that control continental growth and evolution. Because the triple junction has been migrating north along the coast of North America, an understanding of crustal structure and evolution in this region will provide insights into the geologic history of the entire U.S. west coast continental margin and will contribute to better assessments of the seismic hazards represented by the Cascadia subduction zone and northern San Andreas Fault system. In 1993 and 1994 the principal investigators collected a network of large-aperture seismic profiles to image the crustal and upper- mantle structure beneath northern California and the adjacent continental margin. The data include approximately 650 km of onshore seismic refraction/reflection data, 2000 km of offshore multichannel seismic (MCS) reflection data, and simultaneous onshore and offshore recording of the MCS airgun source to yield large-aperture data. Scientists from more than 12 institutions were involved in data acquisition, which was led by a team of principal investigators from Oregon State, Lehigh, Rice, and Stanford Universities and from the U.S. Geological Survey. This award provides a fourth year of support from the Continental Dynamics program to permit the principal investigators to complete data analysis and presentation. Support for a workshop is also provided during which they will discuss their seismological results with the broader community of earth scientists interested in geological, ge odynamic, and natural hazard issues associated with plate interactions in along the western margin of North America. ***

9526116 Meltzer北加州的沿海地区从纬度39on到42on代表一个区域，在该区域中，主动构造政权从俯冲活动突然变化为Mendocino Triple Junction（MTJ）的运动。 了解该区域的地壳和上层结构的知识，并结合有关板岩历史，地质结构，地震活动以及热涌入和随之而来的表面火山症的时间的信息，对控制大陆生长和进化的过程构成了约束。 由于三连接点一直沿北美海岸向北迁移，因此对该地区的地壳结构和进化的理解将提供对整个美国西海岸大陆边缘的地质历史的见解，并将有助于更好地评估卡斯卡迪亚俯冲区和北萨圣安德烈亚斯故障系统所代表的地震危害。 在1993年和1994年，主要研究人员收集了一个大型地震概况网络，以对北加州和邻近大陆边缘下方的地壳和上层结构进行成像。 数据包括大约650公里的陆上地震折射/反射数据，2000 km的海上多通道地震（MCS）反射数据，以及同时在陆上和近海记录MCS气枪源以产生大量数据。 来自12个以上机构的科学家参与了数据获取，该数据获取是由俄勒冈州，利哈伊，赖斯和斯坦福大学以及美国地质调查局的主要研究人员团队领导的。 该奖项为大陆动力学计划提供了第四年的支持，以允许首席研究人员完成数据分析和演示。 还提供了对研讨会的支持，在此期间，他们将与对地质，地球，杂技学和自然危害问题感兴趣的更广泛的地球科学家讨论与北美西部边缘的板块相互作用相关的自然危害问题。 ***