Direct measurement of dT/dΔ
- 1 April 1969
- journal article
- Published by Seismological Society of America (SSA) in Bulletin of the Seismological Society of America
- Vol. 59 (2), 717-727
- https://doi.org/10.1785/bssa0590020717
Abstract
In this paper we describe and demonstrate a least square method for direct measurement of the wave parameter dT/dΔ. The information necessary for doing this is the coordinates of arbitrarily spaced seismic stations and relative arrival times of the phase under investigation. The dT/dΔ parameter is derived from a function in ϕ and λ, representing the variation of T over the array. An iteration loop is included for examining and selecting a T-response function of simple form, i.e., containing few parameters, and thus making the method applicable even to arrays containing few stations. Using data from Jeffreys-Bullen tables where sometimes random errors are added, the calculated dT/dΔ values at the array centers deviate less than 0.06 from the true value and the estimates have standard errors around ±0.15.Keywords
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