Hazardous terrain in Homemade Settings, World Building & Galaxy Construction
uncle_jimbo Aug 29 2015, 06:55 Group: Grid Cop, 5éme Corbin Quote Post
Places on Earth can develop dangerous conditions in a local area, or for a limited time, that might be more extensive on another world. For example:

Meltwater rivers of Greenland

On Greenland's ice sheet, a vast icy landscape crisscrossed by turquoise rivers and dotted with meltwater lakes, a small cluster of orange camping tents popped up in late July. The camp, home for a week to a team of researchers, sat by a large, fast-flowing river. Just half a mile (a kilometer) downstream, the river dropped into a seemingly bottomless moulin, or sinkhole in the ice ..

This camp was Laurence C. Smith's field research site in western Greenland. Smith, a professor and chair of geography at the University of California, Los Angeles, and his NASA-funded team were studying the hydrology of the ice sheet -- how the shifting network of streams and rivers that form during the melt season transport water from the surface of the ice to the ocean, contributing to sea level rise.

.. the scientists go to great lengths to ensure safety. Were anyone to slip and fall in the frigid waters, he or she would be quickly swept away into the moulin without any possibility of rescue, disappearing forever. For this reason, researchers must tether themselves to ropes when working near the rivers.


Another might be the crystal caves of northern Mexico.

This post has been edited by uncle_jimbo on Aug 29 2015, 06:59
uncle_jimbo Jan 31 2017, 21:17 Group: Grid Cop, 5éme Corbin Quote Post
The Broomway

Warning: The Broomway is unmarked and very hazardous to pedestrians.

Warning: Do not approach or touch any object as it may explode and kill you.

Away from the sea wall ran the causeway, perhaps five yards wide, formed of brick rubble and grey hardcore. It headed out to sea over the mud, before disappearing into water and mist. Poles had been driven into the mud on either side of the path, six feet tall, marking out its curling line. There were a few tussocks of eelgrass. The water’s surface was sheened with greys and silvers, like the patina on old mirror-glass. Otherwise, the causeway appeared to lead into a world of white.

After 300 yards the causeway ended, dipping beneath the sand like a river passing underground. Further out, a shallow sheen of water lay on top of the sand, stretching away. The diffused light made depth perception impossible, so that it seemed as if we were simply going to walk onwards into the ocean.
uncle_jimbo Mar 25 2017, 23:46 Group: Grid Cop, 5éme Corbin Quote Post
uncle_jimbo Oct 2 2017, 07:51 Group: Grid Cop, 5éme Corbin Quote Post
Challenge #26 gives some fairly standard description of volcanoes and lava forms, but more notably, an extract from Grand Survey that relates their occurrence and behaviour to various characterictics of planets (edit: which might benefit from something at hand to translate UWPs, to make them more usable for Alternity).

This post has been edited by uncle_jimbo on Dec 24 2018, 08:26
uncle_jimbo May 21 2018, 04:13 Group: Grid Cop, 5éme Corbin Quote Post
Currently in Hawaii: Lava spatter injuries, laze

The possibility of the lava flows reaching the ocean, meanwhile, threatens to release toxic gases in a plume called a "laze".

When molten lava hits sea water, the chemical reaction can create "hazy and noxious conditions" laced with hydrochloric acid and tiny particles of glass, the US Geological Survey (USGS) says.

"Even the wispy edges of it can cause skin and eye irritation and breathing difficulties," USGS warned.


edit: a different condition: vog

This post has been edited by uncle_jimbo on May 23 2018, 02:49
uncle_jimbo Nov 7 2018, 10:12 Group: Grid Cop, 5éme Corbin Quote Post
uncle_jimbo Dec 10 2018, 08:01 Group: Grid Cop, 5éme Corbin Quote Post
It sounds spectacular, actually:

The Sarlacc Pit
uncle_jimbo Jan 4 2019, 19:33 Group: Grid Cop, 5éme Corbin Quote Post
Mentioned elsewhere:

The Strid

The River Wharfe in Yorkshire makes for a lovely spot for a picnic or walk, but it has a dark side - a stretch of water that it's claimed is the most dangerous in the world.
uncle_jimbo Jan 10 2019, 08:59 Group: Grid Cop, 5éme Corbin Quote Post
Author (uncle_jimbo @ Oct 2 2017, 18:51)
Challenge #26 gives some fairly standard description of volcanoes and lava forms, but more notably, an extract from Grand Survey that relates their occurrence and behaviour to various characterictics of planets (edit: which might benefit from something at hand to translate UWPs, to make them more usable for Alternity).

There's the True Density, K, that I mentioned, table not included in this excerpt.

So to summarise:
  • Determine if a non-gas-giant planet has a molten core, a non-molten rocky body, or icy composition. Sub-Terran and Cold worlds and those with thin atmospheres are more likely to be icy, less likely to have a molten core.
  • Molten core worlds have separate tectonic plates, more of them as they get larger and have more extensive oceans.
  • Seismic and volcanic activity increases with a molten core, closer and larger satellites, and a closer orbit to a more massive star. The GMG planet generation procedure should provide most of this, making some assumptions for satellite orbits.
  • It seems likely, though the magazine doesn't cover it, a GM could do a very similar thing for moons. Further, we might be more interested than in 1986 in the structure and activity of icy bodies.
  • Likelihood, behaviour and damage follows for earthquakes and volcanoes.


This post has been edited by uncle_jimbo on Jan 10 2019, 09:05


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