ERS120H5 Lecture 17: LEC 17
Document Summary
Long-term forecasting: identify hazardous areas and probability of major quake. Short-term forecasting: based on precursor phenomena but mostly unsuccessful: early warning systems: after an actual earthquake. Speed (slow, intermediate, fast: material involved (rock vs. regolith, character (coherent, chaotic, slurry, environment (on land vs. submarine) Slow downhill creeping of material: very slow movement of unconsolidated material downslope. Slump: movement of material down a curved slip surface. Mudflow, debris flow: material flowing downhill as a chaotic mixture with water. Lahar: volcanic material flowing downhill as a chaotic mixture with water, mixes with loose volcanic material and rushes downstream. Large, chaotic mass travelling rapid down a slope. Rockfall: dislodging of material from a steep slop. Submarine landslides: grand banks earthquake, november 18, 1929, mw 7. 2, 5 m high tsunami, twenty seven people drowned, million in damage, broke 12 trans-atlantic cables in 28 places. Slope: the steeper the slope gets, the more likely for a failure, resulting in a landslide.
