T Wave 1
T Wave 1 : Earthquake T waves, in common with tsunamis, are generated by movements of the ocean floor. In the case of T waves the movement is oscdlatory, while for the tsunami it more closely resembles a moving-step function. Although the oscillatory waves are not likely to indicate the magnitude and direction of permanent displacement of the ocean floor, they may find application in delimiting the lateral extent of the affected region. From the standpoint of tsunami generation this dimension is probably more diagnostic than an estimate of earthquake magnitude. Also,earthquake T waves may find application to the tsunami warning problem by being interpreted in terms of the length or rupture. This dimension is a more direct indication of the potential of an earthquake to generate a tsunami than is earthquake magnitude. Earthquake swarms within a confined region may be recognized as such by the repetition of their signature. The length of rupture of a major earthquake can be estimated from the duration of the high-level portion of the T phase at two or more stations. It is speculated that equivalent information may be obtained from one recording station by azimuthally tracking the incoming T waves
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