Chao Liang

Laboratoire Géoazur

Fluid-filled fractures support guided waves known as Krauklis waves. The resonance of Krauklis waves within fractures occurs at specific frequencies; these frequencies, and the associated at- tenuation of the resonant modes, can be used to constrain the frac- ture geometry. We use numerical simulations of wave propagation along fluid-filled fractur...

Mature waterfloods often present significant Reservoir Management challenges. After an initial boost in oil production, water cuts tend to increase and flood performance starts to decline. Complex reservoirs that have been producing for decades through hundreds or thousands of wells are notoriously challenging to model. Creating and history-matchin...

Very long period (VLP, 2-100 s) seismic signals at basaltic volcanoes like Kilauea, Hawai`i, and Mount Erebus, Antarctica, are likely from resonant oscillations of magma within the shallow plumbing system. The system consists of conduits connected to cracks (dikes and sills) or reservoirs of other shapes. A quantitative understanding of wave propag...

Very long period (VLP) seismic events (with dominant periods of 15 to 40 s), observed from 2007 to 2018 at the summit of K{\=\i}lauea Volcano, Hawai`i, arise from resonant oscillations in the shallow magma plumbing system. Utilizing an oscillation model developed in the companion paper (Liang et al., 2019), we perform Bayesian inversions on seismic...

Supershear earthquakes are rare compared to their subshear counterparts, but the cause for their paucity remains to be understood. We investigate for the first time the prevalence of supershear ruptures across multiple earthquake cycles on long faults using rate‐and‐state friction and a 2.5D approximation that accounts for the finite seismogenic wi...

Plain Language Summary Some notable earthquakes have occurred on sets of horizontally sliding vertical faults that cross each other at almost right angles (90°). This is puzzling because the conventional theory of how Earth's brittle outer shell, the crust, breaks predicts a narrower angle between faults, close to 60°. Our work offers an explanatio...

On November 11, 2019, a Mw 4.9 earthquake hit the region close to Montelimar (lower Rhône Valley, France), on the eastern margin of the Massif Central close to the external part of the Alps. Occuring in a moderate seismicity area, this earthquake is remarkable for its very shallow focal depth (between 1 and 3 km), its magnitude, and the moderate to...

Basaltic volcanoes like Kīlauea, Hawai'i, pose hazards through lava flows and other eruptive activity. Quantifying hazard requires constraining the volume of magma stored in shallow reservoirs, as well as the capacity of those reservoirs to accumulate and discharge magma in response to pressure changes (i.e., storativity). Shallow reservoirs are of...

Renewable energy resources such as wind and solar are intermittent, which causes instability when being connected to utility grid of electricity. Compressed air energy storage (CAES) provides an economic and technical viable solution to this problem by utilizing subsurface rock cavern to store the electricity generated by renewable energy in the fo...