Absolute Dating of Prehistoric Earthquakes by Tree-Ring Analysis in California

这项研究是为了进行树木年轮研究，这些研究已经被证明可以提供史前地震的信息，绝对的年份日期和破裂区域。测试不会损坏树木。古地震学对于建立足够长的地震记录以估计未来大地震的可能性至关重要。不久的将来很可能与最近的过去相似。海岸红杉树或保存完好的树桩沿着加利福尼亚北部的几个断层存在，有些树龄可以追溯到600多年前。研究将集中在两个主要项目区域，旧金山北部的圣安德烈亚斯断层和卡斯卡迪亚俯冲带南端的小鲑鱼溪断裂带。这项研究是国家减少地震危害计划的一个组成部分。

This research is to carry out tree-ring studies that have been proven to yield information, absolute year dates and zones of rupture, for prehistoric earthquakes. The testing does not damage the trees. Paleoseismology is essential for establishing a long enough record of earthquakes to enable estimation of probabilities for future major earthquakes. The immediate future is likely to be similar to the most recent past. Coastal redwood trees or well-preserved stumps exist along several faults in northern California and some ages extend back over 600 years. The research will concentrate on two main project areas, the San Andreas fault north of San Francisco and the Little Salmon Creek fault zone at the southern end of the Cascadia Subduction Zone. This research is a component of the National Earthquake Hazard Reduction Program.