Amplitude of the Earth's free oscillations and long‐period characteristics of the earthquake source | Zendy

Kanamori Hiroo | Zendy; Anderson Don L. | Zendy

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Amplitude of the Earth's free oscillations and long‐period characteristics of the earthquake source

Author(s) -

Kanamori Hiroo,

Anderson Don L.

Publication year - 1975

Publication title -

journal of geophysical research

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.67

H-Index - 298

eISSN - 2156-2202

pISSN - 0148-0227

DOI - 10.1029/jb080i008p01075

Subject(s) - amplitude , shock (circulatory) , seismology , physics , geology , seismic moment , period (music) , excited state , geophysics , atomic physics , optics , acoustics , medicine , fault (geology)

Amplitude spectra of the spheroidal modes 0 S 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 0 S 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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