6-m resolution image of shaded relief multibeam bathymetry in western Massachusetts Bay map Quadrangle 3, pseudo-colored by backscatter intensity (Q3_BACKPC.TIF)

The U.S. Geological Survey has conducted geologic mapping to characterize the sea floor offshore of Massachusetts. The mapping was carried out using a Simrad Subsea...美国地质调查局（U.S. Geological Survey）已开展地质测绘工作，以表征马萨诸塞州近海海底的特征。本次测绘采用Simrad Subsea设备完成。