RE-EVALUATION OF EARTHQUAKE POTENTIAL AND SOURCE IN THE VICINITY OF NEWBURYPORT, MASSACHUSETTS Final Technical Report Research supported by the U.S. Geological Survey (USGS), Department of the Interior, under USGS award 1434-04HQGR0049 Martitia P. Tuttle M. Tuttle & Associates 128 Tibbetts Lane Georgetown, ME 04548 Tel: 207-371-2007 E-mail:
[email protected] URL: http://www.mptuttle.com Project Period: 1/1/2004-12/30/2005 Program Element II: Research on Earthquake Occurrence and Effects Key Words: Paleoliquefaction, Tsunami Geology, Recurrence Interval, Age Dating The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. RE-EVALUATION OF EARTHQUAKE POTENTIAL AND SOURCE IN THE VICINITY OF NEWBURYPORT, MASSACHUSETTS Martitia P. Tuttle M. Tuttle & Associates 128 Tibbetts Lane Georgetown, ME 04548 Tel: 207-371-2007 E-mail:
[email protected] Abstract In the early 1990s, a search for and study of liquefaction features induced by the 1727 Newburyport earthquake also found paleoliquefaction features that formed sometime in the past 4,000 years. Because the ages of the paleoliquefaction features were poorly constrained, the number and timing of the paleoearthquakes responsible for the features were not estimated. In addition, the area over which the earthquake(s) induced liquefaction was not determined, limiting interpretations of earthquake location and magnitude. Picking up where the 1990s study left off, a more recent effort attempted to relocate other liquefaction sites reported during the 1727 earthquake in the hopes of finding additional paleoliquefaction features.