Actually from the beginning has seemed clear that the explosion in Bone in South Sulawesi on October 8, 2009 and caused by the entry of celestial bodies later turned into a large meteor. Or in the terminology of astronomy called Fireball.

Fireball is similar but has the brilliance of a meteor large enough to exceed the brilliance of the planet Venus, or have a visual magnitude exceeding -4 (minus 4) so that he could be seen clearly in the daylight. If the brightness is very high that equals or exceeds the brilliance of the light phase of the Moon at the full moon is called superfireball Fireball or bolide in terms of geologists.

So, why blast Bone can be easily confirmed as Fireball? Simple indication. There was light in the sky followed by a straight trail and then winding. This trail straight regular termed “train” and comes from the condensation of particles scattered from the surface due to high temperatures Fireball as it slid to the molecules of Earth’s atmosphere.

This condensation to form clouds at a height typically approximately 60 km. This type of cloud is also
observed for example in the event Fireball Tagish Lake (January 2000) in Canada, or Fireball asteroid 2008 TC3 (October 2008) in Sudan.

Cloud was followed by a rumbling sound that show signs of sonic boom (sonic boom). This sound is due to melintasnya an object with supersonic speed. There are 3 to 4 sonic boom that occurs there is an impression that there is 3 to 4 objects passing.

With just a trace of smoke was seen while 3 to 4 objects in it suggests that the large Fireball so fragmented (divided) in a certain height in the atmosphere. This fragmentation makes the conversion from Fireball energy into acoustical energy (sound). The conversion efficiency on average by only 0.1%.

Sonic boom was followed by a vibration in the ground (ground Shaking). This phenomenon can only be caused by a Fireball that can be a marker. The ground vibration caused by the conversion of acoustic energy into seismic energy to form a surface wave (Rayleigh wave alias) which then spread to all directions.

Rayleigh wave that is identical to the waves of an earthquake. Except if we look at the tape Seismogram and will prove that the record is slightly different from seismogramnya Seismogram recorded earthquakes in general because it is not preceded by recording the P wave (primary) or S waves (secondary).

Rayleigh waves are slow and large wavelengths. In this wave seismology is known as a wave of destruction because he actually played an important role in the Earth’s surface damage caused by the earthquake. Well, the conversion of acoustic energy into seismic energy is on average ranging from 0.01 to 0.00001%. (more…)