Seismic Scaling of Explosive Source Functions Using Teleseismic P Waves
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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Short period P waves of four presumed Soviet explosions from Eastern Kazakh are examined at five teleseismic arrays LASA, YKA, OONW, WRA and GBA. Transfer functions to shape the lower magnitude to the highest magnitude event were computed at each array to eliminate transmission path effects from source to receiver. The transfer functions are locally consistent from sensor to sensor at each array, but show considerable global variations from array to array. This suggests that there are strong azimuthal variations in the source radiation of the events, due to complex scattering of the signals at the test site. At LASA, the observed transfer functions can be explained by using explosion source functions of Blake and Haskell. The assumed source parameters are scaled functions of the yield of each event, which is estimated from an empirical amplitude yield relationship.
- Seismic Detection and Detectors