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Microseisms and Teleseisms Recorded in Australia
Spectral density estimates, depicting seismic noise recorded in Australia by temporary networks of the Earthquake Mechanism Laboratory, range from 5 to 20 dB higher (at 1.0 Hz) than similar estimates made from seismic noise recorded at Uinta Basin Observatory, Vernal, Utah. Amplitudes of microseisms recorded at network stations show similar time-varying trends which seem correlated to meteorological conditions. In the band about 1.0 Hz, the estimated coherence of microseisms approaches that for unrelated samples when sensors are separated by approximately 2 km. Studies of 178 teleseisms suggest a detection threshold of mb = 4.6 for shallow teleseisms occurring as far as 90 degrees from network stations. Many of the teleseismic recordings show anomalous short-period P waves. Visual estimates of the coherence of P waves, recorded at network stations, range from almost coherent to almost incoherent. (Author).
Upper Mantle Project
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Earthquake Research in ESSA, 1969-1970
"During the past several years the ESSA Earthquake Research Committee (ERC) has conducted an annual scientific review of all Earthquake Research being done in ESSA. This year the scientific review meeting was held in Boulder, Colorado on 8 and 9 July 1970. All organizational elements of ESSA were encourages to be represented by qualified working scientists who could properly review their entire Earthquake Research program. This review was to include all work being done for ESSA by outside grantees and contractors as well as in house research. The grantees and contractors in most cases were invited to attend and present their own work"--Introduction
