The use of liquefaction features in paleoseismology: Lessons learned in the New Madrid seismic zone, central United States

摘要: A recent study in the New Madrid seismic zone demonstrates that large uncertainties, often involved but rarely expressed, paleoliquefaction studies can be reduced by conducting detailed investigations at most promising sites for dating liquefaction features. During site investigations, care must taken to collect samples will provide close maximum and minimum dates It is advisable use two-sigma calibrated dates, rather than one-sigma or radiocarbon ages, when estimating ages of Well-constrained individual features should basis timing paleoearthquakes correlating across a region. As uncertainty decreases, confidence estimates timing, source areas magnitudes increases. The also shows modern historic earthquakes induced same region whose locations are fairly well know serve as calibration events paleoearthquakes. Future efforts could further improve usefulness feature paleoseismology include (1) development new techniques directly, (2) case focus on spatial distributions geotechnical properties (3) more rigorous quantification uncertainties associated with