Variations and Controls on the Up- and Down-Dip Limits of the Central America Seismogenic Zone

电话：0229876 SchwartzA一阶表征的孕震区，包括其几何形状和向上和向下倾斜的限制几乎是建立在北方和中部哥斯达黎加。这是通过在孕震区正上方部署两个陆上/海上地震网络实现的，这是MARGIN资助的多学科孕震区实验（CRSEIZE）的一部分。这项建议旨在：1）使用本实验期间收集的数据，结合当地网络数据，建立尼加拉瓜孕震区的类似一级特征; 2）对北方哥斯达黎加和尼加拉瓜板块间地震活动性向板块内地震活动性转变的变化进行详细调查; 3）评估已提出的控制这种转变的热和力学模型。 将通过同时反演北方哥斯达黎加和尼加拉瓜的当地旅行时间数据来完成这些golas，以获得高分辨率、三维、P波和S波速度结构和准确的震源位置。地震位置加上震源机制的确定，将使尼加拉瓜南部的活跃地震带得以确定，在那里增加北方哥斯达黎加（尼科亚）网络的台站将大大改善台站的覆盖范围和震源的准确性。

EAR-0229876Susan Y. SchwartzA first-order characterization of the seismogenic zone, including its geometry and up and down-dip limits is nearly established in northern and central Costa Rica. This was accomplished through the deployment of two onshore/offshore seismic networks directly above the seismogenic zone that were part of a MARGIN's funded multidisciplinary seismogenic zone experiment (CRSEIZE). This proposal seeks to: 1) use data collected during this experiment in conjunction with local network data to establish a similar first-order characterization of the seismogenic zone in Nicaragua; 2) perform a detailed investigation of the variations in the transition from inter to intra plate seismicity in northern Costa Rica and Nicaragua; and 3) evaluate thermal and mechanical models that have been proposed to control this transition. These golas will be accomplished by simultaneously inverting local travel time data in northern Costa Rica and Nicaragua to obtain an high resolution, three-dimensional, P and S wave velocity structure and accurate hypocentral locations. Earthquake locations coupled with focal mechanism determinations will allow the active seimogenic zone to be identified in southern Nicaragua, where the addition of stations from the northern Costa Rica (Nicoya) network greatly improves station coverage and hypocentral accuracy.