| Session Details | |
| Section | SE - Solid Earth Sciences |
| Session Title | Observations and Implication of Stress Geomechanics Integrations, Slow and Fast Earthquake Source Physics and Triggered and Induced Seismicity |
| Main Convener | Dr. Chung-Han Chan (Nanyang Technological University, Singapore) Dr. Hung-Yu Wu (Japan Agency for Marine-Earth Science and Technology, Japan) |
| Co-convener(s) | Dr. Liqing Jiao (Nanyang Technological University, Singapore) Dr. Sushil Kumar (Wadia Institute of Himalayan Geology, India) Dr. Roland Gritto (Array Information Technology, United States) |
| Session Description | Stress geomechanics specifies how large-scale crusts and small-scale rocks respond to strain, fluid and heat propagations that provide essential information on understanding seismic behaviors and tectonic settings. The stress state in geological structures or along plate boundaries can be determined through single or multiple approaches, including in-situ stress measurements, geophysical, geodetic, geothermal and/or hydrological approaches. These studies shed light on the stress/strain analysis in the crust, including stress evolution by seismic and volcanic activity, crustal heterogeneity, and modeling for earthquake cycle. Unusual earthquake phenomena like slow earthquake, deep episodic tremor, low-frequency earthquakes, very-low-frequency earthquakes and slow slip events arise from shear slip with long characteristic durations and radiation of much less seismic energy compared to typical tectonic earthquakes. Slow seismic events may be useful for better understanding of the plate subduction process and large earthquake generation. Another class of unusual earthquakes are triggered or induced events at shallow depth, which have been found to be associated with human operations like hydrocarbon exploration, wastewater-injection, hydraulic fracturing, geothermal energy production, mining operations, CO2 sequestration and reservoir impoundment are capable to trigger or induce seismicity at shallow depths. It is therefore of critical importance that such anthropogenic earthquakes are better monitored and understood such that their hazards may be mitigated. This session combines multi-disciplinary studies on stress geomechanics and induced and triggered seismicity, including but not limited, to scientific drilling, in-situ measurement, focal mechanism of crustal and volcanic earthquakes, subsurface anisotropy analysis and applications of the geomechanical models to earthquake forecasting, engineering construction. We also invite contributions on earthquake simulation models, on insight on the kinematics and dynamics of earthquake generation and cycles, on discrimination between natural, triggered and induced earthquakes and understanding of their various mechanisms, and assessment of seismic hazard associated with anthropogenic events. We focus our discussion not only on the observations in association with physical models, but also on potential interdisciplinary cooperation between various research fields. |