Collaborative Research: Seismogenesis of the Middle America Trench at the Nicoya Peninsula over multiple seismic cycles

智力价值拟议中的工作将利用尼科亚半岛的陆上地质证据，解决与沿中美洲海沟100公里长的部分俯冲有关的基本问题。这项工作包括以下几个部分：(1)古地震学：该项目的这一部分将利用河口的地层和古生态来调查史前地震的规模和复发情况。(2)古地理：作为古地震调查的一部分，这项研究将调查尼科亚半岛的相对海平面变化，以评估地震间隔期间垂直地面运动的模式。(3)地貌构造与长期隆升：这项研究将检验长期形变与地震发生的关系。所有这些技术将结合起来定义俯冲带上的史前破裂行为。布罗德影响这个项目包括一名博士生的培训。本科生将参加实地考察项目。与哥斯达黎加同事的国际合作有很大一部分内容。将为来自美国和哥斯达黎加的学生组织研讨会，并将在研究现场为学生举办实地学校。这项研究对于了解哥斯达黎加的地震危害很重要。

Intellectual MeritThe proposed work would use onshore geologic evidence from the Nicoya Peninsula to address basic questions related to subduction along a 100-km-long part of the Middle America Trench. The work includes the following components: (1) Paleoseismology: This part of the project will investigate pre-historic earthquake size and recurrence using the stratigraphy and paleoecology of an estuary. (2) Paleogeodesy: As part of the paleoseismic investigation, the study would investigate relative sea level change on the Nicoya Peninsula to assess patterns of vertical ground motion during intervals between earthquakes. (3) Morphotectonics and long-term uplift: The study will test the relationship of long-term deformation to earthquake generation. All of these techniques will be combined to define the pre-historic rupture behavior along the subduction zone.Broader ImpactsThis project includes the training of a Ph.D. student. Undergraduate students will participate in the field program. There is a large component of international collaboration with colleagues in Costa Rica. A workshop for students from the US and Costa Rica will be organized, and a field school for the students will be held at the research site. The study is important for understanding seismic hazards in Costa Rica.