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

正在为横跨中美洲海沟和哥斯达黎加的一项为期三年的多机构、两断面、大地测量和地震试验提供资金，该试验就在俯冲的可可和俯冲的加勒比板块之间的孕震界面上方。PI将在陆地上操作GPS、水准和数字记录地震仪，并在近海部署海底地震仪(OBSS)。其目的是绘制孕震区的三维分布和性质图，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分布和板块耦合的过程进行比较。尼科亚和奥萨半岛地区的孕震带成像将得到加强，因为当地海岸线靠近大地震发生的海沟轴线。

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.