Seismological Components of the MELT Experiment on the Southern East Pacific Rise

小行星9402375福赛斯 这个实验的目的是提供直接的观测约束下的分布融化和模式的上升流下的洋中脊。 利用海底仪器阵列研究地幔中电磁波和地震波的传播，将提供可反演的测量结果，以发现速度和传导率结构的水平和垂直变化，从而可用于检验流动的理论模型。 一个由47个海底地震仪组成的阵列将在南纬17度左右的东太平洋海隆部署六个月，以记录地震和区域地震源。 该台阵记录的P波和S波以及其他体波相位和Love面波和Rayleigh面波将用于探测100至200公里深度和距脊轴数百公里深度的地幔横向变化。 主要目的是确定是否有一个狭窄的区域，高熔体浓度和低地震速度直接下脊轴，并绘制其垂直和水平范围。 另一个目标是限制上升流的模式。 * _ 1

9402375 Forsyth This experiment is designed to provide direct observational constraints on the distribution of melt and the pattern of upwelling beneath a mid-ocean ridge. Studies of electromagnetic and seismic wave propagation in the mantle with arrays of ocean- bottom instruments will furnish measurements that can be inverted to find horizontal and vertical variations in velocity and conductivity structure that can be used to test theoretical models of flow. An array of 47 ocean-bottom seismometers will be deployed for six months on the East Pacific Rise at about 17 degrees south to record teleseismic and regional earthquake sources. P and S waves, as well as other bady wave phases and Love and Rayleigh surface waves recorded by the array will be used to probe lateral variations in mantle to a depth of 100 to 200 km and out to several hundred km from the ridge axis. The main goal is to establish whether there is a narrow region of high melt concentration and low seismic velocities directly beneath the ridge a1xis and to map its vertical and horizontal extent. Another goal is to constrain the pattern of upwelling. *** _______________________________ 1