COLLABORATIVE RESEARCH: Magnetotelluric Survey Along the PACE Transect in the Southwestern United States

太平洋到亚利桑那州地壳实验(PACE)是一个多学科的横断面，横跨位于加利福尼亚州南部的古老岩浆弧、大陆裂谷和伸展地体。PI将沿着这一断面收集大地电磁数据，以加强已经计划的地震实验。在加利福尼亚州东部的CALCRUST线和亚利桑那州的Cocorp线上已经发现了突出的中地壳反射体。如果这些反射带是由流体、部分熔融或糜棱岩带中的石墨等导电矿物引起的，大地电磁测深将对这些反射带很敏感。因此，电学测量将有助于确定中地壳结构。此外，在半岛山脉的测量将有助于定位大陆和海洋地壳之间的旧缝合带。大地电磁测量将与一家商业承包商签订合同，以确保尽可能获得最好的数据，并将使用最新的二维反演和三维正演模拟来解释数据。这项调查旨在为未来可能进行的EMSOC实验进行侦察。

The Pacific to Arizona Crustal Experiment (PACE) is a multidisciplinary transect which crosses an old magmatic arc, a continental rift, and an extensional terrane all located in southern California. The PIs will collect magnetotelluric data along this transect to enhance the seismic experiments already planned. Prominent mid-crustal refectors have already been found on CALCRUST lines in eastern California and COCORP lines in Arizona. Magnetotelluric soundings will be sensitive to these reflective zones if they are cause by fluid, partial melt, or conductive minerals such as graphite in mylonitic zones. Thus, electrical measurements will help identify midcrustal structure. Further, measurements in the Peninsular Ranges will help locate the old suture zone between continental and oceanic crust. The magnetotelluric survey will be contracted to a commercial contractor in order to guarantee the best data possible and will use the latest 2-D inversions and 3-D forward modeling to interpret the data. This survey is designed as a reconnaissance for a possible future EMSOC experiment.