GPS Study of the Transition Between Subduction and Collision in Papua New Guinea

巴布亚新几内亚俯冲与碰撞过渡的 GPS 研究

• 批准号: 9725792
• 负责人: Eli Silver
• 金额: $ 27.12万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-01-15 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725792&HistoricalAwards=false
• 关键词: GPS; Study; Transition; Between; Subduction

9725792 Silver This study will investigate how the distribution of strain rates across the Papua New Guinea (PNG) convergent margin evolves from oceanic subduction at the New Britain trench to the broader continental collision. Because the overall rates of motion are high, a geodetic network in PNG can be used to determine the extent to which deformation is distributed rather than focused on discrete faults and the degree to which the primary basal decollement is locked. Working together with scientists from Australia and PNG, the P.I.s will measure an expanded GPS network (48 sites) across the Huon Peninsula and Finisterre Range and across the Markham valley to the New Guinea Highlands, an area of approximately 350 x 350 km. They will occupy the expanded network during June, 1998, and again in June, 2000. Purchasing an additional instrument, an Ashtech Z-12, to leave in PNG between campaigns, will give scientists at UNITECH the opportunity to remeasure baselines between campaigns, an effort of great value for the study of interseismic and intraseismic slip. ***

9725792白银这项研究将研究巴布亚新几内亚会聚边缘的应变率分布是如何从新不列颠海沟的大洋俯冲演变到更广泛的大陆碰撞的。由于总的运动速率很高，PNG的大地测量网络可以用来确定变形的分布程度，而不是集中在离散的断层上，以及初级基底滑脱被锁定的程度。与澳大利亚和巴布亚新几内亚的科学家合作，P.I.S将测量一个扩展的GPS网络(48个站点)，覆盖Huon半岛和Finisterre山脉，并跨越Markham山谷到新几内亚高地，面积约为350 x 350公里。他们将在1998年6月和2000年6月再次占用扩展后的网络。购买一台额外的仪器--Ashtech Z-12，在两次活动之间离开巴布亚新几内亚，将使Unitech的科学家有机会在两次活动之间重新测量基线，这一努力对研究地震间和地震内滑动具有重要价值。***