Macroseismics
Geophysics speaks of macroseismic phenomena and observations when it comes to seismic waves of high energy. The term is not sharply defined and is mostly used as a counterpart to microseismics .
Macroseismics therefore include earthquakes of a certain strength if their effect at the observer's location clearly stands out from the spectrum of other ground movements . Artificially triggered vibrations for exploring the earth's crust , such as those caused by explosions or vibrations in the context of seismics , are therefore also part of macroseismics.
If, on the other hand, a distant earthquake or a closer but weak earthquake is close to or below the detection limit in the seismogram , we speak of microseismic effects.
The term macroseismic is also used in seismology for data or series of measurements , if z. B. the seismicity no sufficiently dense network of stations exists. In this case, from the available data, which only concern stronger earthquakes, conclusions can be drawn about the frequency of smaller earthquakes in the region.
- See also: seismograph , depth of focus , noise (seismology)
Literature and web links
- Bruce A. Bolt : Earthquakes, Keys to Geodynamics . Spektrum-Verlag, Heidelberg 1996
- László Egyed : Solid Earth Physics , 370 p., Akadémiai Kiadó, Budapest 1969
- D.Csomor, Z.Kiss: The seismicity of Hungary . Studia Geophysica et Geodaetica Vol.3 / 1, Eötvös-Inst.Budapest and Czech Academy of Science, Prague 1959