Earth and Climate Science

 

Dr. Sohom Ray, IIT Roorkee
\"https://zoom.us/j/92200545435?pwd=RG15QW9PVk5wRUNEYzlFWmk2WVdSUT09 Meeting ID: 922 0054 5435 Passcode: 272682\"

<span data-sheets-userformat="\\&quot;{\\&quot;2\\&quot;:833,\\&quot;3\\&quot;:{\\&quot;1\\&quot;:0},\\&quot;9\\&quot;:0,\\&quot;11\\&quot;:4,\\&quot;12\\&quot;:0}\\&quot;" data-sheets-value="\\&quot;{\\&quot;1\\&quot;:2,\\&quot;2\\&quot;:\\&quot;Interfacial" sliding="" is="" ubiquitous="" on="" earthâ��glacier="" ice="" sheets,="" landslides,="" crustal="" faults,="" and="" subduction="" zones.="" in="" spite="" of="" their="" disparate="" geology,="" ambient="" conditions,="" geometries,="" spatial="" scales,="" interfacial="" motion="" bear="" commonalities="" that="" could="" be="" understood="" with="" simple="" physical="" models.="" the="" standard="" linear="" elastic="" fracture="" mechanics="" friction="" provide="" a="" seamless="" handle="" to="" understand="" slip.="" we="" review="" various="" frictional="" conditions="" how="" they="" dictate="" geological="" fault="" slip="" or="" basal="" glacier="" sheets="" landslides.="" also="" highlight="" nonlinearities="" constitutive="" laws="" strength,="" together="" deformation="" medium,="" lead="" rich="" complexity="" over="" length="" scales.="" particular,="" show="" slow="" rate="" can="" transition="" rapid="" one,="" an="" instability="" mediates="" two,="" relevance="" initiating="" earthquake.="" further,="" problem="" posed="" broader="" framework="" nonlinear="" dynamics;="" explore="" canonical="" fluid="" mechanical="" instabilities="" help="" broaden="" understanding="" elastofrictional="" instabilities.="" \\"}\\"="" style="\\&quot;color:" rgb(0,="" 0,="" 0);="" font-size:="" 10pt;="" font-family:="" arial;\\"="">Interfacial sliding is ubiquitous on earth–glacier ice sheets, landslides, crustal faults, and subduction zones. In spite of their disparate geology, ambient conditions, geometries, and spatial scales, their interfacial motion bear commonalities that could be understood with simple physical models. The standard linear elastic fracture mechanics and interfacial friction provide a seamless handle to understand slip. We review various interfacial frictional conditions and how they dictate the geological fault slip or basal slip in glacier ice sheets or landslides. We also highlight that the nonlinearities in the constitutive laws of interfacial strength, together with elastic deformation of the medium, lead to rich slip complexity over various length scales. In particular, we show how the slow rate of slip can transition to a rapid one, how an instability mediates the two, and their relevance in initiating an earthquake. Further, the problem of slip complexity can be posed in the broader framework of nonlinear dynamics; and we explore how the canonical fluid mechanical instabilities help broaden the understanding of the elastofrictional slip instabilities.