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Subduction zones, one of the three types of plate boundaries, return Earth's surface to its deep interior. Because subduction zones are gently inclined at shallow depths and depress Earth's temperature gradient, they have the largest seismogenic area of any plate boundary. Consequently, subduction zones generate Earth's largest earthquakes and most destructive tsunamis. As tragically demonstrated by the Sumatra earthquake and tsunami of December 2004, these events often impact densely populated coastal areas and cause large numbers of fatalities. While scientists have a general understanding of the seismogenic zone, many critical details remain obscure. This volume attempts to answer such fundamental concerns as why some interplate subduction earthquakes are relatively modest in rupture length (greater than 100 km) while others, such as the great (M greater than 9) 1960 Chile, 1964 Alaska, and 2004 Sumatra events, rupture along 1000 km or more.Contributors also address why certain subduction zones are fully locked, accumulating elastic strain at essentially the full plate convergence rate, while others appear to be only partially coupled or even freely slipping; whether these locking patterns persist through the seismic cycle; and what is the role of sediments and fluids on the incoming plate. Nineteen papers written by experts in a variety of fields review the most current lab, field, and theoretical research on the origins and mechanics of subduction zone earthquakes and suggest further areas of exploration. They consider the composition of incoming plates, laboratory studies concerning sediment evolution during subduction and fault frictional properties, seismic and geodetic studies, and regional scale deformation. The forces behind subduction zone earthquakes are of increasing environmental and societal importance.
Del 113 - Geophysical Monograph Series
Faults and Subsurface Fluid Flow in the Shallow Crust
Inbunden, Engelska, 1999
475 kr
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Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 113.This volume offers a sample of the diversity of research on faults and fluid flow in the late 1990s. It describes detailed surface and subsurface characterization of fault-zone structure and diagenesis with implications for hydrology and petroleum geology; the role of faults in geothermal systems; laboratory studies of rock mechanics, permeability, and geochemistry of faults and fault rocks; and mathematical modeling of fluid flow through faulted and fractured rocks.The most striking and appealing feature of the volume, as well as the general research topic of faults and subsurface fluid flow, is its interdiscplinary nature. The authors are drawn from the fields of structural geology, engineering geology, geohydrology and hydrogeology, sedimentology, petroleum geology, geothermal geology, rock mechanics, and geochemistry. Likewise, the emphasis on faults rather than simple open fractures raises issues not addressed in much of the literature on flow through fractured rocks. Although faults are a type of fracture and semantics can confuse the issue, faults are generally more complicated than the simple fractures that are the focus of most work in fractured rock hydrology. Most notably, faults can have very large displacements (up to many kilometers) and develop complicated tectonic fabrics, gouge zones, and juxtaposition of rocks or sediments of different types.