...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geochemistry, geophysics, geosystems >Heat flow along the Costa Rica Seismogenesis Project drilling transect: Implications for hydrothermal and seismic processes
【24h】

Heat flow along the Costa Rica Seismogenesis Project drilling transect: Implications for hydrothermal and seismic processes

机译：哥斯达黎加地震发生项目钻探断面的热流：对热液和地震过程的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Heat flow analysis of the Costa Rica convergent margin is carried out for seven sites drilled during Integrated Ocean Drilling Program (IODP) Expeditions 334 and 344 as part of the Costa Rica Seismogenesis Project (CRISP). These expeditions are designed to better understand erosional subduction zones. Heat flow measurements were made to improve estimates of the thermal structure of this erosive margin and are located on the incoming plate, toe, lower, middle, and upper slopes of the margin. Heat flow values corrected for the effects of seafloor bathymetry and sedimentation are on average 15% higher than uncorrected values and range from approximately 158-200 mW/m(2) on the incoming plate to values of approximately 50 mW/m(2) on the middle and upper slopes of the margin. These values are consistent with previous estimates of heat flow showing a landward decrease in heat flow consistent with subduction of the Cocos plate. Preferred thermal models of the shallow subduction zone successfully predicting observed values of heat flow incorporate fluid flow within the upper oceanic aquifer have an uppermost permeability of 10(-9.5) m(2) and a plate boundary effective coefficient of friction of 0.06. These models suggest that temperatures on the subduction thrust reach 100 degrees C at distances between 30 and 35 km landward of the deformation front. The updip limit of seismicity, as defined by aftershocks events of M-L 1-4 recorded following the Mw 6.9 Quepos earthquake, occurs at 25 km landward of the deformation front at temperatures cooler than the 100-150 degrees C typically predicted.
机译：在哥斯达黎加地震发生项目（CRISP）的一部分中，对在综合海洋钻探计划（IODP）334和344探险期间钻探的七个地点进行了哥斯达黎加会聚边界的热流分析。这些考察旨在更好地了解侵蚀俯冲带。进行热流测量以改善对该侵蚀边缘的热结构的估计，并且位于进入的板，脚趾，边缘的下，中和上斜面上。经过海底测深和沉降影响校正的热流值平均比未经校正的热流值高15％，范围从进站板的大约158-200 mW / m（2）到大约50 mW / m（2）的值。边缘的中坡和上坡。这些值与以前的热流估计值一致，表明热流向内减少，这与Cocos板的俯冲一致。成功预测热流观测值的浅层俯冲带优选热模型结合了上部海洋含水层内的流体流，其最高渗透率为10（-9.5）m（2），板边界有效摩擦系数为0.06。这些模型表明，俯冲推力上的温度在形变锋面向后30至35 km之间的距离达到100摄氏度。由6.9级Quepos地震后记录的M-L 1-4余震事件定义，地震活动性的上冲极限发生在形变前沿25公里处，温度低于通常预测的100-150摄氏度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号