Fault density,earthquakes, and the topography of crustal stratification interfaces: Central Magadan Oblast |
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| Authors: | N K Gaidai L Yu Kalinina |
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| Institution: | 1.Northeast Multidisciplinary Research Institute, Far East Division,Russian Academy of Sciences,Magadan,Russia;2.Northeast State University,Magadan,Russia |
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| Abstract: | This study is concerned with quantitative estimation of the relationship between earthquakes and tectonic crustal fragmentation
based on a correlation analysis of fault density with seismicity parameters (the number and energy of earthquakes per unit
area) for the Sredne-Yamskoi seismic junction and adjacent area. The highest level of seismic activity and the highest probability
of earthquake occurrence with energy classes K ≥ 12 within areas that have a continental crust with a well-pronounced granite layer occur in those areas with the mean fault
density. Within areas with a thinner granite layer in the crust, the most likely seismic events are K ≥ 12 earthquakes that occur in areas with lower fault density. We estimated the relationship between the degree of crustal
fragmentation and the topography of stratification interfaces in the crust as identified by new interpretative gravimetry.
Zones with the lowest degree of fragmentation tend to be areas where the top of the crystalline basement lies deeper. |
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