Channel: Innovation Article http://journal.ucas.ac.cn EN-US http://journal.ucas.ac.cn/EN/2095-6134/current.shtml http://journal.ucas.ac.cn 2095-6134 http://journal.ucas.ac.cn/EN/10.7523/j.ucas.2022.059 28 Pa·s, the tangential compressive stress in lithosphere accumulates to several hundreds of MPa in the present day, while the tensile stress in deep mantle reaches up to 100 MPa. Consequently, part of the shallow moonquake events can be explained by thermal stress. However, the focal mechanism of deep moonquakes is still unclear. We speculate that the tensile thermal stress in deep mantle helps to develop pore structures, and the melting layer provides pore fluid with high pressure, which reduces the fracture strength of mantle medium.]]>