assignor to Schlumberger Technology Corporation 4 J .anuary 1983 (Class 367/34); flied 6 December 1979 This sonic logging tool consists of a transmitter and several receivers spaced one above the other. First portions of each received signal are correlated with each other using an assumed velocity, and the process is repeated using lesser and greater velocities. The best correlation is selected as the first provisional velocity. The process is repeated for second, third etc. portions of each waveform. The result is velocities for both the compressional and shear components of the acoustic wave.--TGW 4,364,033 43.40.Ph ALARMING SEISMOMETER Yun-Tyng Tsay, Taipei, Taiwan

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