ABSTRACT: A summary of formulas for calculation of tidal accelerations due to the moon and the sun were compiled for computer use by I.M. Longman in 1959. On the basis of Longman's formulas we developed a Fortran IV program (PRETID) to predict tides for specified time intervals at any point on the surface of a rigid earth. Output from the program PRETID consists of a printout of tidal values in milligals with a corresponding line printer plot. Test cases comparing results with standard EAEG (European Association of Exploration Geophysicists) tables show reliability of the program.

Rudman, A. J., Ziegler, R., and Blakely, R. F., 1977, Fortran program for generation of earth tide gravity values: Indiana Geological Survey Occasional Paper 22, 14 p., 1 fig., 4 app.

You may also like:

Keywords: gravity, program, geophysics

Can't find what you're looking for? Feel free to contact us directly:

Publication Sales Office
Indiana Geological and Water Survey
420 N. Walnut St.
Bloomington, IN 47404
812-855-7636 (phone)
812-855-2862 (fax)

IGS Return Policy

All sales are final. Materials may not be returned after they have been accepted by the customer. Any discrepencies in mail orders must be reported to IGWS within 10 days of receipt of order.

The Indiana Geological and Water Survey will refund the purchase price and sales tax of products if returned with the original sales receipt within 10 days of receipt of order. Refunds will be issued with the same method of payment as indicated on the original receipt except for cash purchases, which will be refunded by check. Items must be returned in the same condition as purchased. Refunds on digital products and services are not allowed, except for defective media such as CD-ROMs, flash drives, and so on. The customer is responsible for paying shipping costs to return items.