Collaborative Research: Active Out-of-Sequence Thrusting in the Fila Costena Thrust Belt, Pacific Costa Rica

9909699费舍尔9909375加德纳现在人们普遍认识到，会聚边缘可以经历加积或俯冲侵蚀，其速度取决于各种因素。 加积楔的生长过程是有据可查的，然而加积楔的侵蚀过程却更加神秘。 该项目将考察哥斯达黎加的太平洋海岸，并评估与中美洲海沟-断层的内部前弧中的活动逆冲断层相关的流速和总缩短量，这些断层允许通过外部前弧的下冲作用进行俯冲侵蚀。 结果将被用来评估是否有一个弧形移动的位置迅速缩短从脚趾到内部的楔，这方面的粗糙地壳和浅俯冲。 这项工作预计将增加知识，如何accretaionary楔侵蚀。

9909699 Fisher9909375 GardnerIt is now widely recognized that convergent margins can experience accretion or subduction erosion with rates that depend on a variety of factors. The processes by which accretionary wedges grow are well documented, however the processes by which accretionary wedges erode are more enigmatic. This project will examine the Pacific Coast of Costa Rica and evaluate the current rates and the total shortening associated with active thrust faults in the inner fore arc of the Middle America Trench-faults that allow subduction erosion through underthrusting of the outer fore arc. Results will be used to evaluate whether there has been an arcward shift in the location of rapid shortening from the toe to the interior of the wedge for this area of rough crust and shallow subduction. This work is expected to increase knowledge about how accretaionary wedges erode.