US and Japanese Collaborative Research: A Magnetotelluric (MT) Transect Across the Mariana Subduction Factory

pi将在马里亚纳弧上进行深度探测大地电磁（MT）实验，以量化整个俯冲系统的电导率，从海洋岩石圈进入海沟，穿过岛弧并穿过弧后，以解决水释放到地幔楔中的问题以及水合作用和弧后扩张导致的融化过程。这项研究是与日本同事合作进行的；美国的仪器将被放置在太平洋板块的马里亚纳东部，在弧前盆地和横跨西马里亚纳山脊。这个海底样带将位于系统的中间，在那里，深层结构应该最大限度地是二维的。该研究将测量海底以下约20公里至200公里深度的整个系统的二维电阻率剖面。该样带将与独立资助和动员的地震实验相一致，收集广角反射和折射数据，以及本地和远震到达的地震，以约束系统下的地壳和地幔速度和衰减结构

The PIs will conduct a deep-probing magnetotelluric (MT) Experiment across the Mariana arc, to quantify the electrical conductivity across the subduction system, from oceanic lithosphere, into the trench, across the island-arc and through the back-arc, to address issues of water release into the mantle wedge and melting processes resulting from hydration and back-arc spreading. This study is in collaboration with Japanese colleagues; the US instruments will be placed on the Pacific plate to the east of the Mariana, in the fore-arc basin and across the West Mariana Ridge. This seafloor transect will be in the middle of the system where deep structure should be maximally two-dimensional. The study will measure a 2-D electrical resistivity section across the system from depths of about 20km to 200km below the seafloor. The transect will be coincident with that of the independently funded and mobilized seismic experiment, collecting wide-angle reflection and refraction data, as well as local and teleseismic earthquake arrivals to constrain crust and mantle velocity and attenuation structure beneath the system