Abstract
Amplitude spectra of the spheroidal modes _0S_l(l = 2–40) excited by the 1960 Chilean earthquake and observed at Pasadena, Los Angeles, and Isabella show distinct holes at 0_S_(10) (T = 580 s) and _0S_(21) (T = 336 s). These holes can be explained as an interference pattern caused by a composite source consisting of a finite propagating source (main shock) and a slow precursory source, 15 min before the main shock. A total seismic moment of 4–5 × 10^(30) dyn cm is required to explain the observed amplitude.
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