1965/11/15 by Z. F. Daneš, Michaël Bonno, E. Brau +7 · 47 citations
Environmental Science · Earth and Planetary Sciences · #Water Quality and Resources Studies #Underwater Acoustics Research #Geology #Horst #Sound (geography) #Structural basin #Fault (geology) #Igneous rock #Seismology #Basalt #Active fault #Sedimentary rock #Peninsula #Geological survey #Geomorphology #Geophysics #Geochemistry #Archaeology
paper · doi:10.1029/jz070i022p05573
published in Journal of Geophysical Research Atmospheres 70(22), 5573-5580 (American Geophysical Union)
openalex publication_date 1965/11/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
Detailed surface geology and gravity maps of the Puget Sound area, combined with limited magnetic observations, earthquake epicenters, and well records, have been studied in order to determine the geologic structure of the region. The Puget Sound lowlands are a deep crustal depression separated from the Olympic Peninsula by an active fault of about 4000 m throw. The basin is divided into three main parts by an igneous horst with an older gabbroic core and younger basaltic layers. The northeastern part of the basin, centered around Seattle, has sedimentary thicknesses of about 10,000 m. The southern part, centered near Tacoma, and the western one, around Skokomish, are about 4000 m deep. Faults along the horst are active, the northern one more so. Surface geological work is hampered by a thick layer of glacial till.