Quake

Quakes, Tremors, earth quakes, seismic activity

Forms of Seismic activity:

Seismic Wave Quakes
The term seismic activity refers to the propagation and movement of elastic waves, called seismic waves , through a planetary body due to perturbations deep beneath its surface or in its upper layers. These waves cause quakes — the shaking and rolling motions that shifts a planet’s upper crust and surface. Quakes can have numerous causes; for example on Earth [1], movement of the tectonic plates that make up the planet’s surface, and the molten rock in the mantle beneath it, is the primary cause of earthquakes here at home.

On other bodies (Natural Celestial Objects - NCBs ), seismic activity can be caused by other processes as well.

Tidal forces, pressures from cold gases and the roiling of the outer layers of a star can create movements which produce seismic waves, some capable of causing quakes and eruptions many times stronger than those observed on Earth.

Gravi-Pull Quakes
Example: Jupiter’s large moon Io experiences extensive seismic activity due to internal friction caused by Jupiter’s gravitational pull. Images of Io, Neptune’s moon Triton and Enceladus, a large moon of Saturn, also reveal evidence of massive cryovolcanic eruptions – explosions caused by pressures of cold or frozen gases beneath the moon’s surface.

Astro Seismics
Since stars consist primarily of gases, seismic waves observed on stars  originate from turbulence in the outer, convective zone rather than the core. Some of these “star quakes ” generate enough energy to cause the entire star to vibrate like a bell.(Helio-sonocustics ). A solar flare can generate sunquakes, some of which produce energy equivalent to earthquakes of magnitude 11 or stronger.

Cryovolcanics
Example: Beyond the orbit of Neptune, the Kuiper Belt is a region of small icy objects thought to be remnants from the formation of the Solar System. Although Kuiper Belt objects are composed largely of ices such as methane and ammonia, some hints of seismic activity can be observed even there. At 783 miles (1260 km) wide  the Kuiper Belt Object Quaour has an active history cryovolcanic events

[1] Earth experiences several million earthquakes and around 50 volcanic eruptions every year.

[2] asteroseismology (the study of seismic activity on stars)   seismic waves were detected on Jupiter, whose composition – liquids and gases around a small rocky core – actually resembles that of the sun.