Treehouse Island Potential Geological Hazards and Mitigation Improvement

This study examines natural hazards that may impact future housing development in a 1-square-mile area located in Cowlitz County, Washington, USA. The goal is to identify potential geologic risks and inform residents and developers about land safety. We focus on analyzing geological materials, seismic history, and topographic features. The site’s geology includes lake deposits, semi-consolidated sandstone, which may pose construction risks. For example, lake deposits could lead to liquefaction. We also reviewed seismic hazards by examining the region’s earthquake history. Since 2016, the area has experienced 2,705 earthquakes as well as human-detonated explosions, with an average earthquake magnitude of 2.8 and a maximum magnitude of 4.3. This frequency and intensity suggest the area is prone to earthquakes. Topographic features could also pose additional risks. These could exacerbate problems like flooding. By identifying geological, seismic, and topographic hazards, this research provides valuable insights to guide development decisions. We recommend implementing strategies like drilling deep piles into the earth, stabilizing the soil and making sure that it is consolidated to mitigate these risks and ensure safer living environments for future residents. Understanding these hazards is essential for creating sustainable, safe housing developments in Treehouse Island.