Re "An area primed for a disaster," March 28
Unlike earthquakes, landslides like the one in Washington state can be detected, preventing loss of life.
For decades, movements of large sloped land masses have been measured utilizing inclinometers that quantify the magnitude and geometry of soil movements at different depths. The measurements, combined with numerical modeling, produce a three-dimensional imagery of the subsurface soil mass and its directional movements.
To prevent future Hazel Slide disasters, government entities should mandate that developers install monitoring systems that transmit data to the U.S. Geological Survey and state and local survey centers for analysis so any necessary alerts can be issued for evacuations.
The writer is a licensed professional engineer.