TY - JOUR PB - American Physical Society ID - 10.1103/Physics.5.137 TI - Subterranean Sound Waves from Projectile Impact JF - Physics JA - Physics J1 - PHYSICS VL - 5 IS - SP - 137 EP - PY - 2012/12/07/ UR - http://link.aps.org/doi/10.1103/Physics.5.137 A1 - Schirber, Michael ER -