Abstract
The creepex (creep & explosion) parameter provides information on the relation between low- and high-frequency radiation components in the earthquake source and has become a physically meaningful tool for analyzing various aspects of seismogenesis, in particular, the diagnostics of the preparation processes and the its aftershocks activity of a strong event. This paper investigates the spatial-temporal dynamics of creepex in the focal zones of a number of the major earthquakes from the plate convergence regions, including continental Kashmir earthquake (08.10.2005, MS=7.6) and continental-oceanic Tohoku (11.03.2011, Mw=8.7). One of the goals of this work is to demonstrate the capabilities of the method in studying physically grounded patterns of focal zones development at the first hours after the main shock. Because of this study, the following regularities of the source relaxation process were revealed: the partiality of the aftershock process, positive values of the creepex at its first hours (explained by the influence of the dilatancy process), and abrupt changes in the creepex during deep transitions (explained by the thermodynamic effect and by the increase in pressure with depth).
Highlights
This paper investigates the spatial-temporal dynamics of creepex in the focal zones of a number of the major earthquakes from the plate convergence regions, including continental Kashmir earthquake (08.10.2005, MS=7.6) and continental-oceanic Tohoku (11.03.2011, Mw=8.7)
One of the goals of this work is to demonstrate the capabilities of the method in studying physically grounded patterns of focal zones development at the first hours after the main shock
Федерального государственного бюджетного учреждения науки Института вычислительной математики и математической геофизики Сибирского отделения Российской академии наук (ИВМиМГ СО РАН), г
Summary
Вот почему для исследования очагов отдельных крупных землетрясений было решено использовать также региональные каталоги CSN и BJI, значительно превосходящие ISC по полноте, и, при этом, имеющие собственные однозначные определения как MS, так и mb. Приведём примеры сейсмогеодинамических исследований в очагах землетрясений средствами GIS-ENDDB, в частности, по графикам временного распределения ранжированных по магнитудам форшоков и афтершоков MS(t), а также графики поведения их крипекса CrN_cat(t) по ряду крупнейших событий
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