Assessment of the error of blast vibration measurements - Javier Gutierrez; SEGARRA CATASUS, PABLO; QUEROL ARAGON, ENRIQUE; SANCHIDRIAN BLANCO, JOSE ANGEL; LOPEZ SANCHEZ, LINA MARIA (Rock Fragmentation By Blasting - Proceedings Of The 9th International Symposium On Rock Fragmentation By Blasting, Fragblast 9, 2010)