A magnitude 6.8 earthquake struck southern Puget Sound, Washington, USA on February 28, 2001 causing an estimated $0.7 billion to $1.4 billion in damages to the surrounding area. The epicenter was close to the Nisqually delta, one of three major deltas in southern Puget Sound. The Nisqually delta is a wildlife refuge but the other two deltas, the Duwamish delta in Seattle and the Puyallup delta in Tacoma, support extensive infrastructure, including major port facilities at the delta edges. Teams of geologists inspected the area immediately after the earthquake and reported liquefaction features and areas of vertical ground displacement in the Ports of Seattle and Tacoma as well as the presence of "mud plumes" in the waters of Puget Sound. A joint National Oceanic and Atmospheric Administration (NOAA)/U.S. Geological Survey (USGS) cruise was rapidly assembled in March 2001 (3/19/01 to 3/30/01) to map the bathymetry of the delta fronts using the high-resolution multibeam systems of the NOAA Ship Rainier. The mapping discovered a variety of submarine failures on the Puyallup and Duwamish delta fronts that may be related to the earthquake. These data represent the multibeam-echosounder data collected during the survey and are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) or other software to display bathymetry data of the major deltas of southern Puget Sound, WA.
Are there legal restrictions on access or use of the data?
Use_Constraints:USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes.
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
|Data format:||ArcInfo GRID format (version 8.0.2) Size: 6.880|
These data are available in Environmental Systems Research Institute (ESRI) ArcInfo GRID format. The user must have software capable of importing and processing the data file.