| « Time to finish the rain barrel | Home | No kids at the gym » |
Latest Entries
Photos ~ Frost Park Chalk Off #27
Photos ~ Debate and Legos, Together At Last
Saturday in the 'Couve With Family, Friends, and Beer
Photos ~ Frost Park Chalk Off #26
Nordstrom Knows How To Gala (and Open)
Tue. January 10, 2006, 08:39am PST
Photos ~ Mud and debris slide in Tacoma
As I mentioned a couple days ago the rains of late (including last night) have done some work to help some of our nearby hillsides slide a bit. My Geosciences degree does give me some background in this sort of stuff and most of these hillsides are genuinely stable. The gravels that compose most of the area hills aren't as prone as other slopes with thicker topsoil or more clay rich layers. Here we have gravel, clay and sands in pretty thick, distinct layers. The more impermiable clays allow water from above to run along their surface which can destabilize any overriding layers. Fortunately the gravel is highly permiable and lets the water move rather then the gravel along with it and a similar case goes with the sand.
Anyway, enough geo-emoting! As long as this stuff doesn't cause any harm to life I think it's pretty cool to see the Earth re-shaping itself. Here's a couple pics of a somewhat significant landslide just south of Tacoma's Old Town along the edge of a wide and easily access ravine. It looks like an old, large tree help a thinner layer of loose topsoil to slip from the edge it already dangled from. For a little scale, the cliff in this shot is easily 30' tall.
Comments (0) | To Top