updated on Feb. 23, 2007

What is ViewWave?

ViewWave is a viewer for strong motion records. ViewWave can read:
ViewWave can display:
  • Acceleration waveform
  • Integrated velocity and displacement waveform
  • Fourier and power spectrum
  • Auto correlation coefficient
  • Acceleration, velocity and displacement response spectrum
ViewWave also shows following graphs using specific two components if the data file contains two or more components.
  • Particle orbit
  • Fourier amplitude ratio
  • Phase difference
  • Cross power spectrum
  • Cross correlation coefficient
  • Coherence function

System Requirements

ViewWave runs under Windows 2000 Pro or Windows XP. ViewWave stores strong motion data and calculated results on memory, accordingly it requires 256 MB RAM at least.

How to install ViewWave

  1. Uninstall the old version of ViewWave if you have.
  2. Execute vw153.msi (English version) or vw153j.msi (Japanese version) that can be downloaded by clicking on it. The installer will copy necessary files to your system and create a program group [Catfish Tools] in the [Start] menu.

How to use


Copyright of ViewWave is held by T. Kashima, IISEE, BRI. The author is not responsible for any losses caused by ViewWave. Any comments and requests will be welcomed to Some runtime library files come with ViewWave are utilized and distributed under the licenses of:
Microsoft Visual Basic 6.0 (SP5), Copyright © 1987-2000, Microsoft Corp. and
Compaq Visual Fortran 6.6B, Copyright © 2001, Compaq Computer Corp.
Mr. AZC holds copyright of PngPic.dll that is utilized to save a graph as a PNG file.


  • Uninstallation of the older version of ViewWave is recommended before the installation.


  • Ver.1.53 is released on May 18, 2007. Some bugs are fixed. Som options are added in PreProcess dialog.
  • Ver.1.52 is released on February 23, 2007. Response spectra are always calculated when data file is read. It will take time if you read a large file. Normalize response spectra by peak acceleration can be drawn. A new channel by adding two channels can be created. Grid lines can be indicated. USGS SMC files and CSMIP RAW/V2 files may be read. V1 and V2 files as an output from the Kinemetrics SMA software may be read.
  • Ver.1.50 is released on May 23, 2005. Some bugs are fixed. If the time for Fourier analysis is synchronized with the time axis of waveforms, Fourier spectra and related graphs are changed by modifying axis parameters. Some key assigns to handle time axis are added.
  • Ver.1.49 is released on March 15, 2005. Period can be taken as x-axis of Fourier spectra. Some bugs are fixed.
  • Ver.1.48 is released on February 22, 2005. A bug that cannot display velocity response spectrum is fixed.
  • Ver.1.47 is released on January 31, 2005. Functions to display response spectral ratios and energy spectra are added. Modification of calculation parameters is moved to the independent dialog.