This scenario is designed to slot into any existing campaign. It should be set on a world with a breathable atmosphere, a liquid hydrosphere, and a relatively low population (perhaps only a few thousand inhabitants). The starport should be basic (ideally a class D or E port). At the time of the scenario there are very few ships within the system.
Most of the worlds’ population lives in a settlement that forms part of the surface port facilities. The starport is located within a broad valley in the foothills of an ancient mountain range.
While the PCs are in town (perhaps while negotiating with a cargo broker or enjoying the local cuisine) a powerful seismic tremor strikes the region.
For a few moments everything becomes unnaturally still and silent, then a deep rumbling and shuddering begins. The din builds to a crescendo and continues for long terrifying seconds. The ground sways and shakes, cracks appear in walls, masonry falls from above, and all around is a bewildering din of heavy crashes and crunches and stifled cries. A cloud of blinding, choking dust engulfs everything.
Diving under hard cover (such as a table) or getting into the open will help reduce the chances of injury, as will personal armour. Tests against strength or dexterity or even brawling skill (to represent dodging) might be required to achieve such a feat. Even plain luck might be needed. The violent shaking and falling debris prevent anything else being done.
And then the quake fades away.
The dust settles to reveal a disaster zone. Ruined buildings jut skyward, smoke hangs in the air, collapsed walls block streets, and rubble and debris covers destroyed vehicles. The injured and dead lie where they fell. Ragged and dust-caked individuals shamble around while others crouch and stare and cry.