Seismogram

Seismogram with the graphic recording of seismic waves and other natural movements in function of time is known. Seismograms are recorded by a seismograph. From the seismogram can be, for example, to draw conclusions about earthquakes, volcanic activity, but other events, such as strong explosions, drag. Of the seismogram and the natural frequency of vibration of structures can be determined.

Seismograms were Historically recorded by chart recorders that continuously wrote down the readings course as a function of time on a paper roll. Some springs used on ordinary paper, other apparatuses light beams used on photo sensitive paper. Today practically be digitally recorded by computerized analysis to simplify all seismograms. However, today also sporadically classic seismographs are used, mainly for ideological representations to the public. They are essential for based on the Richter scale earthquake measurement.

Strong earthquake in the Nicobar Islands, July 24, 2005 Magnitude 7.3

Indian Ocean Tsunami of 2004 ( " tsunami earthquakes " ), 26 December 2004 magnitude 9.3 ( according to the latest reports even 9.4 )

The seismograms shown above are to give a visual impression of different magnitudes and were not selected according to scientific aspects.

The task is, from those recordings to infer the causes, if possible quantitatively. Is mathematically described as a typical " inverse problem ". The solution is i.a. possible in practice.