Near- and Far-Field Hydrofracture in the Formation of Sheeted Clastic Dikes
Near field (blue) and far field (red) hydrofracture curves shown. During the hydrofracture period, fluid pressure drops as fractures...
Giant Current Ripples at Omak, WA
Focus Shifts North Paleo-outburst flood indicators including large bedform trains and iceberg scour marks have been discovered in Okanogan Valley and other south-trending valleys of NE Washington (Gombiner & Lesemann 2024, Lesemann et al. 2024). Identical features are known in the Channeled Scabland and other outburst flood tracts worldwide, including Iceland. The features document glacial floods of significant size and sourced in southern British Columbia spilled south into
Geology at the Colville River Mouth - Lake Roosevelt, WA
Colville River Mouth. The Colville River enters the Columbia River at Rivermile 100 just south of Kettle Falls, WA. Its an easy hike...
Paleoseismic Trenching in Eastern Washington
Locations of fault trenches in Eastern Washington. Trenched faults in the Yakima Fold Belt . Locations of fault trenching investigations by USGS, Washington Geological Survey, DOGAMI, USBOR, and others. Most trenches were excavated in Columbia River Basalt. The Spencer Canyon trench, epicenter of the 1872 North Cascades quake, lies outside the YFB in older crystalline rocks of the Cascade Range. The Gales Creek trench, near Portland, is not shown on the map. Trench studies ha
