In October 1978 (J.D. 286), the U.S. Geological Survey (USGS) established a seismic refraction line perpendicular to the Kona coast of Hawaii (Fig. 1). The purpose of the experiment was to define the crustal structure of the Kona coast and its relationship to the tectonics of Mauna Loa volcano. This open-file report describes the experiment and presents the data without interpretation. A similar experiment was performed earlier off the southeast coast of Hawaii. Those data are described in Zucca and others (1979) and the results presented in Zucca and Hill (1980).