MUSE: Magmatic Underplating and Swarm Earthquakes

西波希米亚/沃格特兰地区地球动力学活动的起源尚不完全清楚。这包括第四纪火山作用、二氧化碳脱气和地震群。深部岩浆作用被认为是该地区二氧化碳排放的原因，这也可能导致最近发现的第四纪大地震释放的地震群和应力集中。为了验证岩浆底侵作用是否可能导致现今的地球动力学活动，我们计划进行以下研究：(I)确定脆韧性转换的深度和形状；(Ii)估计该地区的总CO2通量，并监测CO2排放及其同位素组成的时间变化及其与地震活动的关系；(Iii)应用受预期侵入时间和现今岩浆脱气作用约束的地热模拟；以及(Iv)估计第四纪喷发期间释放的岩浆产生速率。这将使该地区目前地球动力活动的岩浆起源假说得到检验。

The origin of geodynamic activity in the West Bohemia/Vogtland region is not fully understood yet. This involves the Quaternary volcanism, carbon dioxide degassing and seismic swarms. Deep magmatic processes are attributed to be the cause of CO2 emanations in the area, which could also result in earthquake swarms and stress concentrations released by large Quaternary earthquakes identified recently. To verify if the magmatic underplating could be responsible for the present geodynamic activity, we plan the following study: (i) identify the depth and shape of the brittle- ductile transition (ii) estimate the total CO2 flux in the area and monitor the time variations of CO2 discharge and its isotopic compositions and their relations to seismic activity; (iii) apply geothermal modelling constrained by the expected time of intrusion and the present magma degassing; and (iv) estimate the rates of magma production released during the Quaternary eruptions. This will allow for testing of the magma-origin hypothesis of the present geodynamic activity in the region.