3D INVERSION RESULTS OF THE USARRAY LONG PERIODS MT DATA

3D INVERSION RESULTS OF THE USARRAY LONG PERIODS MT DATA

USARRAY-MT

  • The long periods MT data (LMT) used in this study are collected between 2006 and 2012.
  • Total number of sites is 320.
  • Site spacing ~ 70 km.
  • The LMT data cover the period range from ~10s to ~20,000s.
  • The 3D model spans an area of ~ 1200 km in EW direction and ~ 1100 km in NS direction.
  • The LMT data resolve structures up to a depth of ~450 km.

In this video we show the deep (> 100 km) conductive and resistive structures obtained from inverting the USArray LMT data.

Representative East–West cross-section at latitude 42.5◦N, illustrating some of the main features in the preferred model. The black short-dashed line denotes the top of the subducting plate (McCrory et al.,2012), and the dashed white line gives an estimate of continental Moho location derived from receiver functions (A. Levander, personal communication; see Levander and Miller, 2012). The heavy black long-dashed line represents a schematic LAB. OR: Oregon; ID: Idaho; WY: Wyoming; KM: Klamath Mountains; CVA: Cascade Volcanic Arc; NBR: Northern Basin and Range; SRP: Snake River Plain; WYC: Wyoming Craton.

PUBLICATIONS:

  • Meqbel, Naser & Egbert, Gary & E. Wannamaker, Philip & Kelbert, Anna & Schultz, Adam. (2014). Deep electrical resistivity structure of the Pacific NW derived from 3-D inversion of Earthscope USArray magnetotelluric data. Earth and Planetary Science Letters. 402. 10.1016/j.epsl.2013.12.026.