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Debris flows, landslides, fossil microatolls, paleo-seasonality, and carbonate ore deposits

25 cm) over past millennia at this tectonically stable mid-ocean island. The continuity of growth within and between microatolls indicates that sea level has not oscillated by up to a meter on time scales of centuries as has been widely claimed by researchers using less precise evidence from other sites. The observational record presented by Colin D. Woodroffe and colleagues accords with geophysical modeling, implying that, at this location, the "eustatic" ice-melt component balances the "isostatic" adjustment of the ocean floor in response to loading.

A wider seismogenic zone at Cascadia due to fluid circulation in subducting oceanic crust

Brian D. Cozzens and Glenn A. Spinelli, Earth & Environmental Science Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, USA. Posted online 1 August 2012; doi: 10.1130/G33019.1.

Brian D. Cozzens and Glenn A. Spinelli demonstrate that the potential rupture area for an earthquake offshore of the U.S. Pacific Northwest and British Columbia extends farther landward than previously estimated. In this region, known as the Cascadia subduction zone, magnitude-9 earthquakes (similar to recent events offshore of Japan and Sumatra) have occurred in the past. However, the possible rupture extent for these Cascadia earthquakes is poorly known because there are very few small earthquakes highlighting the portions of the fault capable of nucleating earthquakes. Fault zone temperature is an important proxy, because rock friction experiments suggest that faults must be cooler than 350 degrees Celsius for earthquake nucleation. Previous estimates of the location of 350 degrees Celsius on the plate interface in Cascadia suggested that the possible earthquake rupture zone would be primarily offshore. In contrast, ongoing deformation of the land surface has been interpreted to indicate possible rupture extending landward of the coastline. Cozzens and Spinelli show that flui

Contact: Kea Giles
Geological Society of America

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