A seismic wave is simply a means of transferring energy from one spot to another within the earth. Although seismologists recognize different types of waves, we are interested in only two types: P (primary) waves, which are similar to sound waves, and S (secondary) waves, which are a kind of shear wave.
Several committees divide their work into sub units called subcommittees. The Senate currently has 16 standing committees, and 4 permanent select or special committees. The House has 19 standing committees and 3 permanent select committees. Committee sizes range from 6 to 50 members per committee. In the House, one person may not serve on more than two standing committees and four subcommittees at one time, though waivers can be granted to serve on additional committees.
Standing committees in the Senate have their jurisdiction set by three primary sources: Senate Rules, ad hoc Senate Resolutions, and Senate Resolutions related to committee funding. To see an overview of the jurisdictions of standing committees in the Senate, see Standing Rules of the United States Senate, Rule XXV.