TY - GEN AU - Steinmetz, L. AU - Whitmarsh, R. B. AU - Moreira, V. Sousa TI - Upper mantle structure beneath the Mid-Atlantic ridge north of Azores based on observations of compressional waves KW - COMPOSIÇAO DA CROSTA TERRESTRE KW - INMG KW - 553.3 KW - med KW - fre ER -