Which mechanism causes deep-focus earthquakes at subduction zones along the Wadati-Benioff zone?

💡 Explanation

When a subducting plate descends, hydration of minerals like brucite to serpentine occurs at high pressure and lower temperature lowering shear strength, causing deep-focus earthquakes. Therefore reduced shear strength results, rather than heating, melting, or elastic rebound which initiate different geological phenomena.

• Which outcome occurs when silicate rocks undergo hydrolysis?
• Which risk commonly increases when flood control levees compress underlying organic-rich soils?
• Which mechanism causes intermediate-depth earthquakes along subduction zones?
• Which risk increases when a large inland reservoir experiences rapid drawdown during the seismically active period?
• Which process causes a deep-water trench where an oceanic plate subducts under a continental plate?
• Which outcome occurs when the Earth's rotation weakens gyre circulation?