TY - JOUR A1 - Walker, S. N. A1 - Kadirkamanathan, V. A1 - Pokhotelov, O. A. T1 - Changes in the ultra-low frequency wave field during the precursor phase to the Sichuan earthquake: DEMETER observations JO - Ann. Geophys. J1 - ANGEO VL - 31 IS - 9 SP - 1597 EP - 1603 Y1 - 2013/09/27 PB - Copernicus Publications SN - 1432-0576 UR - https://angeo.copernicus.org/articles/31/1597/2013/ L1 - https://angeo.copernicus.org/articles/31/1597/2013/angeo-31-1597-2013.pdf DO - 10.5194/angeo-31-1597-2013 ER -