The focal mechanism of an earthquake describes the inelastic deformation in the source region that generates the seismic waves. In the case of a fault-related event it refers to the orientation of the fault plane that slipped and the slip vector and is also known as a fault-plane solution. Focal mechanisms are derived from a solution of the moment tensor for the earthquake, which itself is estimated by an analysis of observed seismic waveforms.

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  • The focal mechanism of an earthquake describes the inelastic deformation in the source region that generates the seismic waves. In the case of a fault-related event it refers to the orientation of the fault plane that slipped and the slip vector and is also known as a fault-plane solution. Focal mechanisms are derived from a solution of the moment tensor for the earthquake, which itself is estimated by an analysis of observed seismic waveforms. The focal mechanism can be derived from observing the pattern of "first motions", that is, whether the first arriving P waves break up or down. This method was used before waveforms were recorded and analysed digitally and this method is still used for earthquakes too small for easy moment tensor solution. Focal mechanisms are now mainly derived using semi-automatic analysis of the recorded waveforms.
  • Eine Herdflächenlösung ist eine in der Geophysik genutzte Darstellung der Messungen von Erdbebenmesstationen bezüglich eines bestimmten Erdbebens. Die Herdflächenlösung dient dem besseren Verständnis der zugrundeliegenden Mechanik eines Erdbebens und hilft bei der Identifizierung der Ursache des Bebens.
  • 震源机制解，或称断层面解，是用地球物理学方法判别断层类型和地震发震机制的一种方法。一次地震发生后，通过对不同的地震台站所接受到的地震波信号进行数学分析，即可求出其震源机制解。震源机制解不仅可以使人了解断层的类型（是正断层、逆断层还是走滑断层），而且可以揭示断层在地震前后具体的运动情况。
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  • The focal mechanism of an earthquake describes the inelastic deformation in the source region that generates the seismic waves. In the case of a fault-related event it refers to the orientation of the fault plane that slipped and the slip vector and is also known as a fault-plane solution. Focal mechanisms are derived from a solution of the moment tensor for the earthquake, which itself is estimated by an analysis of observed seismic waveforms.
  • Eine Herdflächenlösung ist eine in der Geophysik genutzte Darstellung der Messungen von Erdbebenmesstationen bezüglich eines bestimmten Erdbebens. Die Herdflächenlösung dient dem besseren Verständnis der zugrundeliegenden Mechanik eines Erdbebens und hilft bei der Identifizierung der Ursache des Bebens.
  • 震源机制解，或称断层面解，是用地球物理学方法判别断层类型和地震发震机制的一种方法。一次地震发生后，通过对不同的地震台站所接受到的地震波信号进行数学分析，即可求出其震源机制解。震源机制解不仅可以使人了解断层的类型（是正断层、逆断层还是走滑断层），而且可以揭示断层在地震前后具体的运动情况。
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  • Focal mechanism
  • Herdflächenlösung
  • 震源机制解
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