1. Department of Geology Institute of Cenozoic Geology and Environment State Key Laboratory of Continental Dynamics Northwest University Xi'an China
2. Department of Physics Geophysics University of Alberta EdmontonAlberta Canada
3. State Key laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an China
4. CAS Center for Excellence in Quaternary Science and Global Chinese Academy of Sciences Xi'an China
5. Servicio Arqueomagnético Nacional Instituto de Geofísica Univesidad Nacional Autónoma de México Campus Morelia Morelia Mexico
6. Chengdu Center of Geological Survey China Geological Survey Chengdu China