Imaging the Seismogenic Zone with Geodesy and Seismology: Two Land Ocean Transects Across Costa Rica and the Middle America Trench

目前正在提供资金，以便在中美洲海沟和哥斯达黎加、就在俯冲科科斯板块和上覆加勒比板块之间的地震发生界面之上进行一项为期三年的多机构、两个断面的大地测量和地震实验。PI将在陆地上操作GPS，水准测量和数字记录地震仪，并在海上部署海底地震仪（OBS）。目的是绘制地震孕育区的三维分布和性质，即产生大地震的锁定或部分锁定的板块界面，以便与控制地震活动和板块耦合分布的过程进行比较。在尼科亚和奥萨半岛地区，由于当地海岸线靠近大地震发生的海沟轴线，因此将加强对孕震区的成像。

Funds are being provided for a three year, multi-institutional, two-transect, geodetic and seismic experiment across the Middle America Trench and Costa Rica, immediately above the seismogenic interface between subducting Cocos and overriding Caribbean plates. The PIs will operate GPS, leveling, and digitally recording seismometers on land and deploy ocean bottom seismometers (OBSs) offshore. The goal is to map the three-dimensional distribution and nature of the seismogenic zone, the locked or the partly locked plate interface that generates large earthquakes, for comparison to processes that control the distribution of seismicity and plate coupling. The imaging of the seismogenic zone will be enhanced in the Nicoya and Osa peninsular region because of the close approach of local coastline to the trench axis where the large earthquakes are generated.