A New Seismic Intensity Parameter to Estimate Damage in Buried Pipelines due to Seismic Wave Propagation

A new seismic intensity parameter to estimate damage in buried pipelines due to seismic wave propagation is proposed. This parameter depends on the peak ground velocity (PGV) and the peak ground acceleration (PGA). It is shown that PGV²/PGA is related to displacement, a parameter directly related to ground strain, which is the main cause of buried pipeline damage. For the case of Mexico City, this parameter exhibits higher correlation with damage than PGA or PGV alone. Finally, we presented intensity-damage relations for the Mexico City's primary water system using PGV²/PGA as the measure of seismic intensity.     

Border thinking: Rossport, Shell and the political geographies of a gas pipeline

Rossport is a small, sparsely populated rural area in the west of Ireland. Over the past seven years, some of its residents have been engaged in a struggle against the building of a gas pipeline through their locality by multinational corporations, including Shell and Statoil. Their struggle has garnered opposition and support within Ireland and internationally. This paper takes the story of Rossport as the starting point for a broader discussion of epistemology within political geography. Drawing on the work of Walter Mignolo, in particular his ideas about ‘border thinking’ and the ‘decoloniality of knowledge’, it argues that Rossport offers the possibility for a redeployment of postcolonial thought within political geography.