. The Earth beneath the sea : History . -\ 0 I T^TTTTTiTnTTTTTrTTTlTm j_ 2 3 4 5 km 50 100 150 km Fig. 11. Gravity-anomaly profiles across Seamount Jasper. (After Harrison and Brisbin, 1959.) Measured gravity corrected for the Eotvos effect is next reduced to sea-level. A shipboard measurement is taken close to sea-level and only a small correction for the free-air gradient is needed. The value of gravity at the latitude of observation according to the International Formula is subtracted from this finally corrected observed value. This difference is known as the free-air anomaly by analogy wit

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. The Earth beneath the sea : History . -\ 0 I T^TTTTTiTnTTTTTrTTTlTm j_ 2 3 4 5 km 50 100 150 km Fig. 11. Gravity-anomaly profiles across Seamount Jasper. (After Harrison and Brisbin, 1959.) Measured gravity corrected for the Eotvos effect is next reduced to sea-level. A shipboard measurement is taken close to sea-level and only a small correction for the free-air gradient is needed. The value of gravity at the latitude of observation according to the International Formula is subtracted from this finally corrected observed value. This difference is known as the free-air anomaly by analogy with the free-air anomaly on land. In fact the correction to sea-level for a sea observation is trivial, and it is not necessary to make any

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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom