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Local infrasound signals from the Tokachi‐Oki earthquake
Author(s) -
Kim Tae Sung,
Hayward Chris,
Stump Brian
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl021178
Subject(s) - infrasound , seismometer , seismology , geology , aftershock , microphone , acoustics , physics , sound pressure
A great earthquake (M w = 8.3) and aftershock (M w = 7.4) occurred near Hokkaido, Japan on September 25, 2003. This earthquake and aftershock were sources of local and epicentral infrasound signals observed at two seismo‐acoustic arrays in the Republic of Korea. Local infrasound results when seismic signals near the receiver couple to the atmosphere. The local cross coupling from seismic ground motion to infrasound signal at two seismo‐acoustic arrays enabled us to compute a seismic‐to‐infrasound transfer function at each array. The observed transfer function quantifies the microphone response when the seismometer response is known. When seismometers and infrasound gauges are collocated, this procedure can provide field calibration.