megaslump

From mega- +‎ slump.

megaslump (plural megaslumps)

1. A very large (geological) slump.
   • 2003, Claudio Bartolini, Richard T. Buffler, Jon Frederic Blickwede, The Circum-Gulf of Mexico and the Caribbean: Hydrocarbon Habitats, Basin Formation, and Plate Tectonics, AAPG Memoir 79, AAPG, →ISBN, page 90:

     [...] slumping event, such as the Lavaca "Megaslump" event of south Texas, this effect may have caused uplift of several to a few tens of meters of footwall areas within about 100 km from the slump. Larger downslope movements such as […]

   • 2018 January 16, Colin K. Ballantyne, Periglacial Geomorphology, John Wiley & Sons, →ISBN, page 133:

     Colin K. Ballantyne. Figure 8.11 (a) Large retrogressive thaw slump (megaslump) along the Selawik River, northwest [...] slumps, and the scar produced by retrogressive slumping as a thermocirque or thermoerosional cirque, but these […]

   • 2020 December 16, Encyclopedia of Geology, Academic Press, →ISBN, page 867:

     ... slumps in northern Yakutia, Siberia. [...] megaslump, Yana Uplands. The headwall is ~50 m high; people for scale.

2. A particularly significant (long, severe, etc) slump (period of poor performance).
   • 2009 October 21, Michael J. Gelb, How to Think Like Leonardo da Vinci: Seven Steps to Genius Every Day, Dell, →ISBN:

     ... slumps, contortions, and tensions of all kinds. And for many kids, the teenage years are a permanent megaslump. Now go to a mall or church or anyplace you can observe families. Watch parents and children walking together and you will […]