Bathymetric data acquired during six cruises to the East Pacific Rise crest 9¿49'--51'N are compiled into a single bathymetric database and used to create high-resolution bathymetry maps of two geologically and biologically active areas. Scanning sonar and Alvin altimetry were collected during 23 Alvin dives to the P-vent/Bio9 and Biomarker-141 areas during 1991--95. Bathymetry data were filtered, edited, and processed as individual dives then combined into a single database for each cruise and statistically evaluated. Cruise data sets were numerically and visually compared and cross-correlated to known bottom features and fixed seafloor reference markers, then horizontally shifted to establish a consistent database with 3 m vertical and 5 m horizontal resolutions. The compiled and corrected bathymetry was used to produce bathymetric maps of two areas within the axial summit collapse trough; a 2¿104 m2 area around P and Bio9 vents, and a 1.1¿103 m2 area around Biomarker 141. The resulting detailed bathymetry maps reveal topography dominated by low-relief volcanic constructional features and post-eruptive collapse of lobate and sheet lava surfaces. ¿ 1998 American Geophysical Union