edited by Alexandra Tolstoy (ATolstoy Sciences, USA), Yu-Chiung Teng (Femarco, Inc., USA), & E C Shang (University of Colorado, Boulder, USA)

The ICTCA conference provides an interdisciplinary forum for active researchers in academia and industry who are of varying backgrounds to discuss the state-of-the-art developments and results in theoretical and computational acoustics and related topics. The papers presented at the meeting cover acoustical problems of common interest across disciplines and their accurate mathematical and numerical modeling.

This volume collects papers that were presented at the sixth meeting. The subjects include geophysics, scattering and diffraction, the parabolic equation (with special sessions in honor of Dr Fred Tappert), seismic exploration, boundary element methods, visualization, oil industry applications, shallow water acoustics, matched field tracking, bubbles, waves in complex media, seabed interactions, ocean acoustic inversion, and mathematical issues in underwater acoustics.

• Cross Hole Simulations in Elastic Formations Using Off-Axis Sources via BEM (J Antonio & A Tadeu)
• The Acoustical Klein–Gordon Equation: The Direct and Inverse Problems (B J Forbes & E R Pike)
• Bottom Reflection Phase Shift Parameter Inversion from Reverberation and Propagation Data (H L Ge et al.)
• Dynamics of Immiscible Two-Phase Fluid Reservoir Flow (A Hanyga)
• Revolutionary Influence of the Parabolic Equation Approximation (D Lee)
• Computation of Acoustic Field on 2D Fronts (N Maltsev)
• Seismic Resolution: An Old Problem But a New Challenge for Seismic Reservoir Characterization (Y-F Sun et al.)
• Simulated Tomographic Geoacoustic Inversion (A Tolstoy)
• and other papers