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SUMMARY:Fast faults and fluids in the earthquake cycle - Tom Mitchell\, Un
 iversity College London
DTSTART:20211118T150000Z
DTEND:20211118T160000Z
UID:TALK162799@talks.cam.ac.uk
CONTACT:Oscar Branson
DESCRIPTION:Fractures in the Earth’s crust and their connectivity are of
  critical important for a number of natural and anthropogenic geological a
 pplications\, as they can act either as conduits or barriers to the flow o
 f fluids such as water\, CO2 or oil.  Fractures and their frictional prope
 rties control the mechanical strength of rock masses\, and therefore the l
 ocation and timing of earthquakes\, and fluid entrapment in large\, fractu
 red fault zones plays a central role in controlling fault mechanics and co
 nsequent seismicity. Magma ascent and subsequent location of volcanic hots
 pots is controlled in part by connected fracture systems\, and many econom
 ically important mineral deposits are a direct result of enhanced fluid fl
 ow in the fractured regions surrounding faults\, such as gold\, copper and
  lithium.  Fractured rock networks host reservoirs of oil\, gas and geothe
 rmal energy resources\, but when empty also provide potential storage loca
 tions for anthropogenically produced CO2.   In this talk\, I will give an 
 overview of the role of fluids in fault and fracture zones in the earthqua
 ke cycle\, specifically focussing on processes that occur on much faster t
 imescales than we are typically used to as geologists.  This includes frac
 turing and frictional weakening processes that occur during earthquakes an
 d planetary long runout landslides\, as well as fast moving coseismic flui
 ds that move through fracture systems\, controlling aftershocks and deposi
 tion of economically important minerals. 
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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