Geology topics

Karl J. Ellefsen

Publications and source records attributed to Karl J. Ellefsen.

43 records · Page 3Linked to original sources

USGS2002

Pick_sw: a program for interactive picking of S-wave data, version 2.00

Program pick_sw is used to interactively pick travel times from S-wave data. It is assumed that the data are collected using 2 shots of opposite polarity at each shot location. The traces must be in either the SEG-2 format or the SU format. The program is written in the IDL and C programming languages, and the program is executed under the Windows operating system. (The program may also execute under other operating systems like UNIX if the C language functions are re-compiled).

Open-File Report↗

USGS2002

FD_BH: a program for simulating electromagnetic waves from a borehole antenna

Program FD_BH is used to simulate the electromagnetic waves generated by an antenna in a borehole. The model representing the antenna may include metallic parts, a coaxial cable as a feed to the driving point, and resistive loading. The program is written in the C programming language, and the program has been tested on both the Windows and the UNIX operating systems. This Open-File Report describes • The contents and organization of the Zip file (section 2). • The program files, the installation of the program, the input files, and the execution of the program (section 3). • Address to which suggestions for improving the program may be sent (section 4).

Open-File Report↗

USGS2000

Assessment of the alluvial sediments in the Big Thompson River Valley, Colorado

To obtain subsurface geologic information about the alluvium in the Big Thompson River valley, S-wave refraction data were collected along three roads that cross the valley. The refraction data were used to estimate velocities and thickness for a layered-earth model; from these models, three cross sections of the river valley were constructed. These cross sections show the thickness and the gross stratigraphy of the alluvium.

Colorado↗

USGS2000