The International Continental Scientific Drilling Program (ICDP)- EGER project (Drilling the Eger Rift) has conducted experiments and deployed high-frequency, three-dimensional (3D) seismic borehole arrays in the Vogtland/Northwest Bohemia region. These experiments investigate earthquake swarms, crustal fluid flow, and mantle-derived carbon dioxide (CO2) degassing in this area. Based on seismic data collected by the ICDPEGER project and a unique, large-N seismic experiment (ELISE) involving over 300 temporary stations, this proposal will, for the first time, explore the upper crustal seismic velocity structure in unprecedented detail through high-resolution local earthquake tomography. Additionally, the ELISE dataset can provide evidence for the hypothesis of magmatic underplating in the uppermost mantle and lower crust intrusions by the inversion of reflected waves. Sill introsions with a high concentration of fluid or melt can be detected and mapped using late-arriving reflected or converted phases. These results will help unravel the relationship between earthquake swarms and mantle-derived CO2 ascent, which are key questions of the ICDP Eger initiative.

The International Continental Scientific Drilling Program (ICDP)- EGER project (Drilling the Eger Rift) has conducted experiments and deployed high-frequency, three-dimensional (3D) seismic borehole arrays in the Vogtland/Northwest Bohemia region. These experiments investigate earthquake swarms, crustal fluid flow, and mantle-derived carbon dioxide (CO2) degassing in this area. Based on seismic data collected by the ICDPEGER project and a unique, large-N seismic experiment (ELISE) involving over 300 temporary stations, this proposal will, for the first time, explore the upper crustal seismic velocity structure in unprecedented detail through high-resolution local earthquake tomography. Additionally, the ELISE dataset can provide evidence for the hypothesis of magmatic underplating in the uppermost mantle and lower crust intrusions by the inversion of reflected waves. Sill introsions with a high concentration of fluid or melt can be detected and mapped using late-arriving reflected or converted phases. These results will help unravel the relationship between earthquake swarms and mantle-derived CO2 ascent, which are key questions of the ICDP Eger initiative.