| In August and September 1994, staff of the U.S. Geological Survey (USGS), David A. Johnston Cascades Volcano Observatory (CVO), executed a first-order leveling survey at Newberry Crater, Oregon as part of CVO's program to monitor Cascades volcanoes. The purpose of the leveling survey was 1) to establish a new baseline data set for the 1931 leveling survey, 2) re-survey a leveling line established in 1985 and re-leveled in 1986, and 3) establish baseline elevation for bench marks that were installed in 1993 along the 1931 level traverse, to bring the level traverse up to first-order standards. In this report we present data for the 1931, 1986, and 1994 surveys. Also included are bench mark descriptions and a location map of all points that were surveyed in 1994. -- Yamashita, et.al., 1995 |
