Velocity Structure and Earthquake Source Study in Regions with Clustered Seismicity

Velocity Structure and Earthquake Source Study in Regions with Clustered Seismicity (GACR 17-19297S) 

The aim of the project is to use waveforms of earthquakes from regions with clustered seismicity and detect prominent crustal and upper mantle discontinuities. Cross-correlation, alignment and stacking together with ray tracing, full waveform modelling and multi-azimuthal approach enable to extract reflected and converted phases and their inversion for depth and topography of discontinuities. Apart from the velocity structure and the source-receiver geometry, the waveforms are significantly affected by focal mechanisms so that attention must be paid to the radiation pattern of events. The method has broad application and will be applied on clustered seismicity, both shallow one in geothermal or volcanic fields, as well as deep seismic sources at subduction zones. Novelty approach aimed at combined velocity structure and source parameter analysis enables to determine topography and 3D character of interfaces and provide a basis for further geodynamic interpretations in complex area of subduction zones as well as knowledge of structure for analysis of shallow induced seismicity.