Abstract
AbstractFluid‐filled volumes in geological systems can change the local stress field in the host rock and may induce brittle deformation as well as crack propagation. Although the mechanisms relating fluid pressure perturbations and seismicity have been widely studied, the fluid‐solid interaction inside the crack of a host rock is still not well understood. An analog experimental model of fluid intrusion in cracks between planar layers has been developed to study stress conditions at the margins and tips. A combined high‐speed shadowgraph and a photoelasticity imaging system is used to visualize the fluid dynamics and induced stresses on the solid matrix. Cavitation, as well as bubble growth and collapse, occurs along the sawtooth crack margins, which produces a highly localized stress concentration to initiate new subcrack systems. The presence of the bubbles at the crack tip during fluid pressure perturbation can enhance crack propagation.
Highlights
Understating the dynamics of magmatic crack growth is crucial for estimating magma transport and eruption precursors
Crack propagation is strongly affected by the stress field caused by the external stress and internal pressure (Sahimi, 2003; Watanabe et al, 2002)
We show that the geometry of the crack wall and tip contribute to crack growth and that cavitation develops in a crack with rough margins
Summary
Understating the dynamics of magmatic crack growth is crucial for estimating magma transport and eruption precursors. Several studies have been published that investigate volatile bubble expansion as a major force driving magma movement and intrusion (Carey et al, 2012; Chernov et al, 2014; Lyakhovsky et al, 1996; Navon et al, 1998; Nishimura, 2004; Proussevitch & Sahagian, 1998) Phenomena such as fluid cavitation, which can trigger shock waves to initiate subcracks, are yet to be understood. Cavitation is an important phenomenon, which has been extensively studied in fluid dynamics (e.g., Birkhoff & Zarantonello, 1957; Brennen, 2014; Moholkar & Pandit, 1997; Singhal et al, 2002; Zwart et al, 2004), and CAO ET AL
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