Final answer:
The worst-case seismic scenario for hydraulic fracturing is the induction of earthquakes by disrupting underground rock formations. Such seismic activity is typically low in magnitude but could threaten regional stability. Also, fracking risks contaminating groundwater with hazardous chemicals.
Step-by-step explanation:
The worst-case scenario concerning hydraulic fracturing (fracking) and its impact on seismic activity is the potential for fracking operations to induce earthquakes. While the technique itself is designed to extract natural gas, the process involves injecting high-pressure fluids into the Earth's crust, which can cause a shift in underground rocks and lead to seismic events. These earthquakes are generally of low magnitude, but there is concern that they could undermine the seismic stability of an area. Fracking also carries the risk of contaminating fresh groundwater resources with hazardous chemicals and byproducts, which can compromise water quality and ecosystem health.